tg.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # Copyright (C) 2008 Petr Baudis <pasky@suse.cz>
   4 # Copyright (C) 2014-2017 Kyle J. McKay <mackyle@gmail.com>
   5 # All rights reserved.
   6 # GPLv2
   7
   8 TG_VERSION="0.19.9.PRE"
   9
  10 # Update in Makefile if you add any code that requires a newer version of git
  11 GIT_MINIMUM_VERSION="@mingitver@"
  12
  13 ## SHA-1 pattern
  14
  15 octet='[0-9a-f][0-9a-f]'
  16 octet4="$octet$octet$octet$octet"
  17 octet19="$octet4$octet4$octet4$octet4$octet$octet$octet"
  18 octet20="$octet4$octet4$octet4$octet4$octet4"
  19 nullsha="0000000000000000000000000000000000000000" # :|git mktree|tr 0-9a-f 0
  20 mtblob="e69de29bb2d1d6434b8b29ae775ad8c2e48c5391" # :|git hash-object --stdin -w
  21 tab='   '
  22 lf='
  23 '
  24
  25 ## Auxiliary functions
  26
  27 # some ridiculous sh implementations require 'trap ... EXIT' to be executed
  28 # OUTSIDE ALL FUNCTIONS to work in a sane fashion.  Always trap it and eval
  29 # "${TRAPEXIT_:-exit}" as a substitute.
  30 trapexit_()
  31 {
  32         EXITCODE_=${1:-$?}
  33         trap - EXIT
  34         eval "${TRAPEXIT_:-exit $EXITCODE_}"
  35         exit $EXITCODE_
  36 }
  37 trap 'trapexit_ $?' EXIT
  38
  39 # unset that ignores error code that shouldn't be produced according to POSIX
  40 unset_()
  41 {
  42         { unset "$@"; } >/dev/null 2>&1 || :
  43 }
  44
  45 # Preserves current $? value while triggering a non-zero set -e exit if active
  46 # This works even for shells that sometimes fail to correctly trigger a -e exit
  47 check_exit_code()
  48 {
  49         return $?
  50 }
  51
  52 # This is the POSIX equivalent of which
  53 cmd_path()
  54 (
  55         { "unset" -f command unset unalias "$1"; } >/dev/null 2>&1 || :
  56         { "unalias" -a || unalias -m "*"; } >/dev/null 2>&1 || :
  57         command -v "$1"
  58 )
  59
  60 # helper for wrappers
  61 # note deliberate use of '(' ... ')' rather than '{' ... '}'
  62 exec_lc_all_c()
  63 (
  64         { "unset" -f "$1" || :; } >/dev/null 2>&1 &&
  65         shift &&
  66         LC_ALL="C" &&
  67         export LC_ALL &&
  68         exec "$@"
  69 )
  70
  71 # These tools work better for us with LC_ALL=C and by using these little
  72 # convenience functions LC_ALL=C does not have to appear in the code but
  73 # any Git translations will still appear for Git commands
  74 awk()   { exec_lc_all_c awk @AWK_PATH@  "$@"; }
  75 cat()   { exec_lc_all_c cat cat         "$@"; }
  76 cut()   { exec_lc_all_c cut cut         "$@"; }
  77 find()  { exec_lc_all_c find find       "$@"; }
  78 grep()  { exec_lc_all_c grep grep       "$@"; }
  79 join()  { exec_lc_all_c join join       "$@"; }
  80 paste() { exec_lc_all_c paste paste     "$@"; }
  81 sed()   { exec_lc_all_c sed sed         "$@"; }
  82 sort()  { exec_lc_all_c sort sort       "$@"; }
  83 tr()    { exec_lc_all_c tr tr           "$@"; }
  84 wc()    { exec_lc_all_c wc wc           "$@"; }
  85 xargs() { exec_lc_all_c xargs xargs     "$@"; }
  86
  87 # Output arguments without any possible interpretation
  88 # (Avoid misinterpretation of '\' characters or leading "-n", "-E" or "-e")
  89 echol()
  90 {
  91         printf '%s\n' "$*"
  92 }
  93
  94 info()
  95 {
  96         echol "${TG_RECURSIVE}${tgname:-tg}: $*"
  97 }
  98
  99 warn()
 100 {
 101         info "warning: $*" >&2
 102 }
 103
 104 err()
 105 {
 106         info "error: $*" >&2
 107 }
 108
 109 fatal()
 110 {
 111         info "fatal: $*" >&2
 112 }
 113
 114 die()
 115 {
 116         fatal "$@"
 117         exit 1
 118 }
 119
 120 # shift off first arg then return "$*" properly quoted in single-quotes
 121 # if $1 was '' output goes to stdout otherwise it's assigned to $1
 122 # the final \n, if any, is omitted from the result but any others are included
 123 v_quotearg()
 124 {
 125         _quotearg_v="$1"
 126         shift
 127         set -- "$_quotearg_v" \
 128         "sed \"s/'/'\\\\\\''/g;1s/^/'/;\\\$s/\\\$/'/;s/'''/'/g;1s/^''\\(.\\)/\\1/\"" "$*"
 129         unset_ _quotearg_v
 130         if [ -z "$3" ]; then
 131                 if [ -z "$1" ]; then
 132                         echo "''"
 133                 else
 134                         eval "$1=\"''\""
 135                 fi
 136         else
 137                 if [ -z "$1" ]; then
 138                         printf "%s$4" "$3" | eval "$2"
 139                 else
 140                         eval "$1="'"$(printf "%s$4" "$3" | eval "$2")"'
 141                 fi
 142         fi
 143 }
 144
 145 # same as v_quotearg except there's no extra $1 so output always goes to stdout
 146 quotearg()
 147 {
 148         v_quotearg '' "$@"
 149 }
 150
 151 vcmp()
 152 {
 153         # Compare $1 to $3 each of which must match ^[^0-9]*\d*(\.\d*)*.*$
 154         # where only the "\d*" parts in the regex participate in the comparison
 155         # Since EVERY string matches that regex this function is easy to use
 156         # An empty string ('') for $1 or $3 or any "\d*" part is treated as 0
 157         # $2 is a compare op '<', '<=', '=', '==', '!=', '>=', '>'
 158         # Return code is 0 for true, 1 for false (or unknown compare op)
 159         # There is NO difference in behavior between '=' and '=='
 160         # Note that "vcmp 1.8 == 1.8.0.0.0.0" correctly returns 0
 161         set -- "$1" "$2" "$3" "${1%%[0-9]*}" "${3%%[0-9]*}"
 162         set -- "${1#"$4"}" "$2" "${3#"$5"}"
 163         set -- "${1%%[!0-9.]*}" "$2" "${3%%[!0-9.]*}"
 164         while
 165                 vcmp_a_="${1%%.*}"
 166                 vcmp_b_="${3%%.*}"
 167                 [ "z$vcmp_a_" != "z" -o "z$vcmp_b_" != "z" ]
 168         do
 169                 if [ "${vcmp_a_:-0}" -lt "${vcmp_b_:-0}" ]; then
 170                         unset_ vcmp_a_ vcmp_b_
 171                         case "$2" in "<"|"<="|"!=") return 0; esac
 172                         return 1
 173                 elif [ "${vcmp_a_:-0}" -gt "${vcmp_b_:-0}" ]; then
 174                         unset_ vcmp_a_ vcmp_b_
 175                         case "$2" in ">"|">="|"!=") return 0; esac
 176                         return 1;
 177                 fi
 178                 vcmp_a_="${1#$vcmp_a_}"
 179                 vcmp_b_="${3#$vcmp_b_}"
 180                 set -- "${vcmp_a_#.}" "$2" "${vcmp_b_#.}"
 181         done
 182         unset_ vcmp_a_ vcmp_b_
 183         case "$2" in "="|"=="|"<="|">=") return 0; esac
 184         return 1
 185 }
 186
 187 # true if "$1" is an existing dir and is empty except for
 188 # any additional files given as extra arguments.  If "$2"
 189 # is the single character "." then all ".*" files will be
 190 # ignored for the test (plus any further args, if any)
 191 is_empty_dir() {
 192         test -n "$1" && test -d "$1" || return 1
 193         iedd_="$1"
 194         shift
 195         ieddnok_='\.?$'
 196         if [ z"$1" = z"." ]; then
 197                 ieddnok_=
 198                 shift
 199                 while ! case "$1" in "."*) ! :; esac; do shift; done
 200         fi
 201         if [ $# -eq 0 ]; then
 202                 ! \ls -a1 "$iedd_" | grep -q -E -v '^\.'"$ieddnok_"
 203         else
 204                 # we only handle ".git" right now for efficiency
 205                 [ z"$*" = z".git" ] || {
 206                         fatal "[BUG] is_empty_dir not implemented for arguments: $*"
 207                         exit 70
 208                 }
 209                 ! \ls -a1 "$iedd_" | grep -q -E -v -i -e '^\.\.?$' -e '^\.git$'
 210         fi
 211 }
 212
 213 precheck() {
 214         if ! git_version="$(git version)"; then
 215                 die "'git version' failed"
 216         fi
 217         case "$git_version" in [Gg]"it version "*);;*)
 218                 die "'git version' output does not start with 'git version '"
 219         esac
 220
 221         vcmp "$git_version" '>=' "$GIT_MINIMUM_VERSION" ||
 222                 die "git version >= $GIT_MINIMUM_VERSION required but found $git_version instead"
 223 }
 224
 225 case "$1" in version|--version|-V)
 226         echo "TopGit version $TG_VERSION"
 227         exit 0
 228 esac
 229
 230 [ $# -eq 1 ] && [ "$1" = "--make-empty-blob" ] || precheck
 231 [ $# -ne 1 ] || [ "$1" != "precheck" ] || exit 0
 232
 233 cat_depsmsg_internal()
 234 {
 235         _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
 236         if [ -s "$tg_cache_dir/refs/heads/$1/.$2" ]; then
 237                 if read _rev_match && [ "$_rev" = "$_rev_match" ]; then
 238                         _line=
 239                         while IFS= read -r _line || [ -n "$_line" ]; do
 240                                 printf '%s\n' "$_line"
 241                         done
 242                         return 0
 243                 fi <"$tg_cache_dir/refs/heads/$1/.$2"
 244         fi
 245         [ -d "$tg_cache_dir/refs/heads/$1" ] || mkdir -p "$tg_cache_dir/refs/heads/$1" 2>/dev/null || :
 246         if [ -d "$tg_cache_dir/refs/heads/$1" ]; then
 247                 printf '%s\n' "$_rev" >"$tg_cache_dir/refs/heads/$1/.$2"
 248                 _line=
 249                 git cat-file blob "$_rev:.$2" 2>/dev/null |
 250                 while IFS= read -r _line || [ -n "$_line" ]; do
 251                         printf '%s\n' "$_line" >&3
 252                         printf '%s\n' "$_line"
 253                 done 3>>"$tg_cache_dir/refs/heads/$1/.$2"
 254         else
 255                 git cat-file blob "$_rev:.$2" 2>/dev/null
 256         fi
 257 }
 258
 259 # cat_deps BRANCHNAME
 260 # Caches result
 261 cat_deps()
 262 {
 263         cat_depsmsg_internal "$1" topdeps
 264 }
 265
 266 # cat_msg BRANCHNAME
 267 # Caches result
 268 cat_msg()
 269 {
 270         cat_depsmsg_internal "$1" topmsg
 271 }
 272
 273 # cat_file TOPIC:PATH [FROM]
 274 # cat the file PATH from branch TOPIC when FROM is empty.
 275 # FROM can be -i or -w, than the file will be from the index or worktree,
 276 # respectively. The caller should than ensure that HEAD is TOPIC, to make sense.
 277 cat_file()
 278 {
 279         path="$1"
 280         case "$2" in
 281         -w)
 282                 cat "$root_dir/${path#*:}"
 283                 ;;
 284         -i)
 285                 # ':file' means cat from index
 286                 git cat-file blob ":${path#*:}" 2>/dev/null
 287                 ;;
 288         '')
 289                 case "$path" in
 290                 refs/heads/*:.topdeps)
 291                         _temp="${path%:.topdeps}"
 292                         cat_deps "${_temp#refs/heads/}"
 293                         ;;
 294                 refs/heads/*:.topmsg)
 295                         _temp="${path%:.topmsg}"
 296                         cat_msg "${_temp#refs/heads/}"
 297                         ;;
 298                 *)
 299                         git cat-file blob "$path" 2>/dev/null
 300                         ;;
 301                 esac
 302                 ;;
 303         *)
 304                 die "Wrong argument to cat_file: '$2'"
 305                 ;;
 306         esac
 307 }
 308
 309 # if use_alt_temp_odb and tg_use_alt_odb are true try to write the object(s)
 310 # into the temporary alt odb area instead of the usual location
 311 git_temp_alt_odb_cmd()
 312 {
 313         if [ -n "$use_alt_temp_odb" ] && [ -n "$tg_use_alt_odb" ] &&
 314            [ -n "$TG_OBJECT_DIRECTORY" ] &&
 315            [ -f "$TG_OBJECT_DIRECTORY/info/alternates" ]; then
 316                 (
 317                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$TG_PRESERVED_ALTERNATES"
 318                         GIT_OBJECT_DIRECTORY="$TG_OBJECT_DIRECTORY"
 319                         unset_ TG_OBJECT_DIRECTORY TG_PRESERVED_ALTERNATES
 320                         export GIT_ALTERNATE_OBJECT_DIRECTORIES GIT_OBJECT_DIRECTORY
 321                         git "$@"
 322                 )
 323         else
 324                 git "$@"
 325         fi
 326 }
 327
 328 git_write_tree() { git_temp_alt_odb_cmd write-tree "$@"; }
 329 git_mktree() { git_temp_alt_odb_cmd mktree "$@"; }
 330
 331 make_mtblob() {
 332         use_alt_temp_odb=1
 333         tg_use_alt_odb=1
 334         git_temp_alt_odb_cmd hash-object -t blob -w --stdin </dev/null >/dev/null 2>&1
 335 }
 336 # short-circuit this for speed
 337 [ $# -eq 1 ] && [ "$1" = "--make-empty-blob" ] && { make_mtblob || :; exit 0; }
 338
 339 # get tree for the committed topic
 340 get_tree_()
 341 {
 342         echo "refs/heads/$1"
 343 }
 344
 345 # get tree for the base
 346 get_tree_b()
 347 {
 348         echo "refs/$topbases/$1"
 349 }
 350
 351 # get tree for the index
 352 get_tree_i()
 353 {
 354         git_write_tree
 355 }
 356
 357 # get tree for the worktree
 358 get_tree_w()
 359 {
 360         i_tree=$(git_write_tree)
 361         (
 362                 # the file for --index-output needs to sit next to the
 363                 # current index file
 364                 cd "$root_dir"
 365                 : ${GIT_INDEX_FILE:="$git_dir/index"}
 366                 TMP_INDEX="$(mktemp "${GIT_INDEX_FILE}-tg.XXXXXX")"
 367                 git read-tree -m $i_tree --index-output="$TMP_INDEX" &&
 368                 GIT_INDEX_FILE="$TMP_INDEX" &&
 369                 export GIT_INDEX_FILE &&
 370                 git diff --name-only -z HEAD |
 371                         git update-index -z --add --remove --stdin &&
 372                 git_write_tree &&
 373                 rm -f "$TMP_INDEX"
 374         )
 375 }
 376
 377 # get tree for arbitrary ref
 378 get_tree_r()
 379 {
 380         echo "$1"
 381 }
 382
 383 # strip_ref "$(git symbolic-ref HEAD)"
 384 # Output will have a leading refs/heads/ or refs/$topbases/ stripped if present
 385 strip_ref()
 386 {
 387         case "$1" in
 388                 refs/"$topbases"/*)
 389                         echol "${1#refs/$topbases/}"
 390                         ;;
 391                 refs/heads/*)
 392                         echol "${1#refs/heads/}"
 393                         ;;
 394                 *)
 395                         echol "$1"
 396         esac
 397 }
 398
 399 # pretty_tree [-t] NAME [-b | -i | -w | -r]
 400 # Output tree ID of a cleaned-up tree without tg's artifacts.
 401 # NAME will be ignored for -i and -w, but needs to be present
 402 # With -r NAME must be a full ref name to a treeish (it's used as-is)
 403 # If -t is used the tree is written into the alternate temporary objects area
 404 pretty_tree()
 405 {
 406         use_alt_temp_odb=
 407         [ "$1" != "-t" ] || { shift; use_alt_temp_odb=1; }
 408         name="$1"
 409         source="${2#?}"
 410         git ls-tree --full-tree "$(get_tree_$source "$name")" |
 411                 sed -ne '/      \.top.*$/!p' |
 412                 git_mktree
 413 }
 414
 415 # return an empty-tree root commit -- date is either passed in or current
 416 # If passed in "$*" must be epochsecs followed by optional hhmm offset (+0000 default)
 417 # An invalid secs causes the current date to be used, an invalid zone offset
 418 # causes +0000 to be used
 419 make_empty_commit()
 420 (
 421         # the empty tree is guaranteed to always be there even in a repo with
 422         # zero objects, but for completeness we force it to exist as a real object
 423         SECS=
 424         read -r SECS ZONE JUNK <<-EOT || :
 425                 $*
 426                 EOT
 427         case "$SECS" in *[!0-9]*) SECS=; esac
 428         if [ -z "$SECS" ]; then
 429                 MTDATE="$(date '+%s %z')"
 430         else
 431                 case "$ZONE" in
 432                         -[01][0-9][0-5][0-9]|+[01][0-9][0-5][0-9])
 433                                 ;;
 434                         [01][0-9][0-5][0-9])
 435                                 ZONE="+$ZONE"
 436                                 ;;
 437                         *)
 438                                 ZONE="+0000"
 439                 esac
 440                 MTDATE="$SECS $ZONE"
 441         fi
 442         EMPTYID="- <-> $MTDATE"
 443         EMPTYTREE="$(git hash-object -t tree -w --stdin < /dev/null)"
 444         printf '%s\n' "tree $EMPTYTREE" "author $EMPTYID" "committer $EMPTYID" '' |
 445         git hash-object -t commit -w --stdin
 446 )
 447
 448 # standard input is a diff
 449 # standard output is the "+" lines with leading "+ " removed
 450 # beware that old lines followed by the dreaded '\ No newline at end of file'
 451 # will appear to be new lines if lines are added after them
 452 # the git diff --ignore-space-at-eol option can be used to prevent this
 453 diff_added_lines()
 454 {
 455         awk '
 456 BEGIN      { in_hunk = 0; }
 457 /^@@ /     { in_hunk = 1; }
 458 /^\+/      { if (in_hunk == 1) printf("%s\n", substr($0, 2)); }
 459 !/^\\ No newline at end of file/ &&
 460 /^[^@ +-]/ { in_hunk = 0; }
 461 '
 462 }
 463
 464 # $1 is name of new branch to create locally if all of these are true:
 465 #   a) exists as a remote TopGit branch for "$base_remote"
 466 #   b) the branch "name" does not have any invalid characters in it
 467 #   c) neither of the two branch refs (branch or base) exist locally
 468 # returns success only if a new local branch was created (and dumps message)
 469 auto_create_local_remote()
 470 {
 471         case "$1" in ""|*[" $tab$lf~^:\\*?["]*|.*|*/.*|*.|*./|/*|*/|*//*) return 1; esac
 472         [ -n "$base_remote" ] &&
 473         git update-ref --stdin <<-EOT >/dev/null 2>&1 &&
 474                 verify refs/remotes/$base_remote/${topbases#heads/}/$1 refs/remotes/$base_remote/${topbases#heads/}/$1
 475                 verify refs/remotes/$base_remote/$1 refs/remotes/$base_remote/$1
 476                 create refs/$topbases/$1 refs/remotes/$base_remote/${topbases#heads/}/$1^0
 477                 create refs/heads/$1 refs/remotes/$base_remote/$1^0
 478         EOT
 479         { init_reflog "refs/$topbases/$1" || :; } &&
 480         info "topic branch '$1' automatically set up from remote '$base_remote'"
 481 }
 482
 483 # setup_hook NAME
 484 setup_hook()
 485 {
 486         setup_git_dir_is_bare
 487         [ -z "$git_dir_is_bare" ] || return 0
 488         tgname="${0##*/}"
 489         hook_call="\"\$(\"$tgname\" --hooks-path)\"/$1 \"\$@\""
 490         if [ -f "$git_hooks_dir/$1" ] && grep -Fq "$hook_call" "$git_hooks_dir/$1"; then
 491                 # Another job well done!
 492                 return
 493         fi
 494         # Prepare incantation
 495         hook_chain=
 496         if [ -s "$git_hooks_dir/$1" -a -x "$git_hooks_dir/$1" ]; then
 497                 hook_call="$hook_call"' || exit $?'
 498                 if [ -L "$git_hooks_dir/$1" ] || ! sed -n 1p <"$git_hooks_dir/$1" | grep -Fqx "#!@SHELL_PATH@"; then
 499                         chain_num=
 500                         while [ -e "$git_hooks_dir/$1-chain$chain_num" ]; do
 501                                 chain_num=$(( $chain_num + 1 ))
 502                         done
 503                         mv -f "$git_hooks_dir/$1" "$git_hooks_dir/$1-chain$chain_num"
 504                         hook_chain=1
 505                 fi
 506         else
 507                 hook_call="exec $hook_call"
 508                 [ -d "$git_hooks_dir" ] || mkdir -p "$git_hooks_dir" || :
 509         fi
 510         # Don't call hook if tg is not installed
 511         hook_call="if command -v \"$tgname\" >/dev/null 2>&1; then $hook_call; fi"
 512         # Insert call into the hook
 513         {
 514                 echol "#!@SHELL_PATH@"
 515                 echol "$hook_call"
 516                 if [ -n "$hook_chain" ]; then
 517                         echol "exec \"\$0-chain$chain_num\" \"\$@\""
 518                 else
 519                         [ ! -s "$git_hooks_dir/$1" ] || cat "$git_hooks_dir/$1"
 520                 fi
 521         } >"$git_hooks_dir/$1+"
 522         chmod a+x "$git_hooks_dir/$1+"
 523         mv "$git_hooks_dir/$1+" "$git_hooks_dir/$1"
 524 }
 525
 526 # setup_ours (no arguments)
 527 setup_ours()
 528 {
 529         setup_git_dir_is_bare
 530         [ -z "$git_dir_is_bare" ] || return 0
 531         if [ ! -s "$git_common_dir/info/attributes" ] || ! grep -q topmsg "$git_common_dir/info/attributes"; then
 532                 [ -d "$git_common_dir/info" ] || mkdir "$git_common_dir/info"
 533                 {
 534                         echo ".topmsg   merge=ours"
 535                         echo ".topdeps  merge=ours"
 536                 } >>"$git_common_dir/info/attributes"
 537         fi
 538         if ! git config merge.ours.driver >/dev/null; then
 539                 git config merge.ours.name '"always keep ours" merge driver'
 540                 git config merge.ours.driver 'touch %A'
 541         fi
 542 }
 543
 544 # measure_branch NAME [BASE] [EXTRAHEAD...]
 545 measure_branch()
 546 {
 547         _bname="$1"; _base="$2"
 548         shift; shift
 549         [ -n "$_base" ] || _base="refs/$topbases/$(strip_ref "$_bname")"
 550         # The caller should've verified $name is valid
 551         _commits="$(git rev-list --count "$_bname" "$@" ^"$_base" --)"
 552         _nmcommits="$(git rev-list --count --no-merges "$_bname" "$@" ^"$_base" --)"
 553         if [ $_commits -ne 1 ]; then
 554                 _suffix="commits"
 555         else
 556                 _suffix="commit"
 557         fi
 558         echo "$_commits/$_nmcommits $_suffix"
 559 }
 560
 561 # true if $1 is contained by (or the same as) $2
 562 # this is never slower than merge-base --is-ancestor and is often slightly faster
 563 contained_by()
 564 {
 565         [ "$(git rev-list --count --max-count=1 "$1" --not "$2" --)" = "0" ]
 566 }
 567
 568 # branch_contains B1 B2
 569 # Whether B1 is a superset of B2.
 570 branch_contains()
 571 {
 572         _revb1="$(ref_exists_rev "$1")" || return 0
 573         _revb2="$(ref_exists_rev "$2")" || return 0
 574         if [ -s "$tg_cache_dir/$1/.bc/$2/.d" ]; then
 575                 if read _result _rev_matchb1 _rev_matchb2 &&
 576                         [ "$_revb1" = "$_rev_matchb1" -a "$_revb2" = "$_rev_matchb2" ]; then
 577                         return $_result
 578                 fi <"$tg_cache_dir/$1/.bc/$2/.d"
 579         fi
 580         [ -d "$tg_cache_dir/$1/.bc/$2" ] || mkdir -p "$tg_cache_dir/$1/.bc/$2" 2>/dev/null || :
 581         _result=0
 582         contained_by "$_revb2" "$_revb1" || _result=1
 583         if [ -d "$tg_cache_dir/$1/.bc/$2" ]; then
 584                 echo "$_result" "$_revb1" "$_revb2" >"$tg_cache_dir/$1/.bc/$2/.d"
 585         fi
 586         return $_result
 587 }
 588
 589 create_ref_dirs()
 590 {
 591         [ ! -s "$tg_tmp_dir/tg~ref-dirs-created" -a -s "$tg_ref_cache" ] || return 0
 592         mkdir -p "$tg_tmp_dir/cached/refs"
 593         awk '{x = $1; sub(/^refs\//, "", x); if (x != "") print x}' <"$tg_ref_cache" | tr '\n' '\0' | {
 594                 cd "$tg_tmp_dir/cached/refs" &&
 595                 xargs -0 mkdir -p
 596         }
 597         awk -v p="$tg_tmp_dir/cached/" '
 598                 NF == 2 &&
 599                 $1 ~ /^refs\/./ &&
 600                 $2 ~ /^[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]+$/ {
 601                         fn = p $1 "/.ref"
 602                         print "0 " $2 >fn
 603                         close(fn)
 604                 }
 605         ' <"$tg_ref_cache"
 606         echo 1 >"$tg_tmp_dir/tg~ref-dirs-created"
 607 }
 608
 609 # If the first argument is non-empty, stores "1" there if this call created the cache
 610 v_create_ref_cache()
 611 {
 612         [ -n "$tg_ref_cache" -a ! -s "$tg_ref_cache" ] || return 0
 613         _remotespec=
 614         [ -z "$base_remote" ] || _remotespec="refs/remotes/$base_remote"
 615         [ -z "$1" ] || eval "$1=1"
 616         git for-each-ref --format='%(refname) %(objectname)' \
 617                 refs/heads "refs/$topbases" $_remotespec >"$tg_ref_cache"
 618         create_ref_dirs
 619 }
 620
 621 remove_ref_cache()
 622 {
 623         [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ] || return 0
 624         >"$tg_ref_cache"
 625         >"$tg_ref_cache_br"
 626         >"$tg_ref_cache_rbr"
 627         >"$tg_ref_cache_ann"
 628         >"$tg_ref_cache_dep"
 629 }
 630
 631 # setting tg_ref_cache_only to non-empty will force non-$tg_ref_cache lookups to fail
 632 rev_parse()
 633 {
 634         rev_parse_code_=1
 635         if [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ]; then
 636                 rev_parse_code_=0
 637                 awk -v r="$1" 'BEGIN {e=1}; $1 == r {print $2; e=0; exit}; END {exit e}' <"$tg_ref_cache" ||
 638                 rev_parse_code_=$?
 639         fi
 640         [ $rev_parse_code_ -ne 0 ] && [ -z "$tg_ref_cache_only" ] || return $rev_parse_code_
 641         git rev-parse --quiet --verify "$1^0" -- 2>/dev/null
 642 }
 643
 644 # ref_exists_rev REF
 645 # Whether REF is a valid ref name
 646 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 647 # or, if $base_remote is set, refs/remotes/$base_remote/
 648 # Caches result if $tg_read_only and outputs HASH on success
 649 ref_exists_rev()
 650 {
 651         case "$1" in
 652                 refs/*)
 653                         ;;
 654                 $octet20)
 655                         printf '%s' "$1"
 656                         return;;
 657                 *)
 658                         die "ref_exists_rev requires fully-qualified ref name (given: $1)"
 659         esac
 660         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify "$1^0" -- 2>/dev/null; return; }
 661         _result=
 662         _result_rev=
 663         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.ref"; } 2>/dev/null || :
 664         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 665         _result=0
 666         _result_rev="$(rev_parse "$1")" || _result=$?
 667         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 668         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 669         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.ref" 2>/dev/null || :
 670         printf '%s' "$_result_rev"
 671         return $_result
 672 }
 673
 674 # Same as ref_exists_rev but output is abbreviated hash
 675 # Optional second argument defaults to --short but may be any --short=.../--no-short option
 676 ref_exists_rev_short()
 677 {
 678         case "$1" in
 679                 refs/*)
 680                         ;;
 681                 $octet20)
 682                         ;;
 683                 *)
 684                         die "ref_exists_rev_short requires fully-qualified ref name"
 685         esac
 686         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify ${2:---short} "$1^0" -- 2>/dev/null; return; }
 687         _result=
 688         _result_rev=
 689         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.rfs"; } 2>/dev/null || :
 690         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 691         _result=0
 692         _result_rev="$(rev_parse "$1")" || _result=$?
 693         if [ $_result -eq 0 ]; then
 694                 _result_rev="$(git rev-parse --verify ${2:---short} --quiet "$_result_rev^0" --)"
 695                 _result=$?
 696         fi
 697         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 698         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 699         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.rfs" 2>/dev/null || :
 700         printf '%s' "$_result_rev"
 701         return $_result
 702 }
 703
 704 # ref_exists REF
 705 # Whether REF is a valid ref name
 706 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 707 # or, if $base_remote is set, refs/remotes/$base_remote/
 708 # Caches result
 709 ref_exists()
 710 {
 711         ref_exists_rev "$1" >/dev/null
 712 }
 713
 714 # rev_parse_tree REF
 715 # Runs git rev-parse REF^{tree}
 716 # Caches result if $tg_read_only
 717 rev_parse_tree()
 718 {
 719         [ -n "$tg_read_only" ] || { git rev-parse --verify "$1^{tree}" -- 2>/dev/null; return; }
 720         if [ -f "$tg_tmp_dir/cached/$1/.rpt" ]; then
 721                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 722                         printf '%s\n' "$_result"
 723                         return 0
 724                 fi
 725                 return 1
 726         fi
 727         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null || :
 728         if [ -d "$tg_tmp_dir/cached/$1" ]; then
 729                 git rev-parse --verify "$1^{tree}" -- >"$tg_tmp_dir/cached/$1/.rpt" 2>/dev/null || :
 730                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 731                         printf '%s\n' "$_result"
 732                         return 0
 733                 fi
 734                 return 1
 735         fi
 736         git rev-parse --verify "$1^{tree}" -- 2>/dev/null
 737 }
 738
 739 # has_remote BRANCH
 740 # Whether BRANCH has a remote equivalent (accepts ${topbases#heads/}/ too)
 741 has_remote()
 742 {
 743         [ -n "$base_remote" ] && ref_exists "refs/remotes/$base_remote/$1"
 744 }
 745
 746 # Return the verified TopGit branch name for "$2" in "$1" or die with an error.
 747 # If -z "$1" still set return code but do not return result
 748 # As a convenience, if HEAD or @ is given and HEAD is a symbolic ref to
 749 # refs/heads/... then ... will be verified instead.
 750 # if "$3" = "-f" (for fail) then return an error rather than dying.
 751 v_verify_topgit_branch()
 752 {
 753         if [ "$2" = "HEAD" ] || [ "$2" = "@" ]; then
 754                 _verifyname="$(git symbolic-ref HEAD 2>/dev/null)" || :
 755                 [ -n "$_verifyname" -o "$3" = "-f" ] || die "HEAD is not a symbolic ref"
 756                 case "$_verifyname" in refs/"$topbases"/*|refs/heads/*);;*)
 757                         [ "$3" != "-f" ] || return 1
 758                         die "HEAD is not a symbolic ref to the refs/heads namespace"
 759                 esac
 760                 set -- "$1" "$_verifyname" "$3"
 761         fi
 762         case "$2" in
 763                 refs/"$topbases"/*)
 764                         _verifyname="${2#refs/$topbases/}"
 765                         ;;
 766                 refs/heads/*)
 767                         _verifyname="${2#refs/heads/}"
 768                         ;;
 769                 *)
 770                         _verifyname="$2"
 771                         ;;
 772         esac
 773         if ! ref_exists "refs/heads/$_verifyname"; then
 774                 [ "$3" != "-f" ] || return 1
 775                 die "no such branch: $_verifyname"
 776         fi
 777         if ! ref_exists "refs/$topbases/$_verifyname"; then
 778                 [ "$3" != "-f" ] || return 1
 779                 die "not a TopGit-controlled branch: $_verifyname"
 780         fi
 781         [ -z "$1" ] || eval "$1="'"$_verifyname"'
 782 }
 783
 784 # Return the verified TopGit branch name or die with an error.
 785 # As a convenience, if HEAD or @ is given and HEAD is a symbolic ref to
 786 # refs/heads/... then ... will be verified instead.
 787 # if "$2" = "-f" (for fail) then return an error rather than dying.
 788 verify_topgit_branch()
 789 {
 790         v_verify_topgit_branch _verifyname "$@" || return
 791         printf '%s' "$_verifyname"
 792 }
 793
 794 # Caches result
 795 # $1 = branch name (i.e. "t/foo/bar")
 796 # $2 = optional result of rev-parse "refs/heads/$1"
 797 # $3 = optional result of rev-parse "refs/$topbases/$1"
 798 branch_annihilated()
 799 {
 800         _branch_name="$1"
 801         _rev="${2:-$(ref_exists_rev "refs/heads/$_branch_name")}"
 802         _rev_base="${3:-$(ref_exists_rev "refs/$topbases/$_branch_name")}"
 803
 804         _result=
 805         _result_rev=
 806         _result_rev_base=
 807         { read -r _result _result_rev _result_rev_base <"$tg_cache_dir/refs/heads/$_branch_name/.ann"; } 2>/dev/null || :
 808         [ -z "$_result" -o "$_result_rev" != "$_rev" -o "$_result_rev_base" != "$_rev_base" ] || return $_result
 809
 810         # use the merge base in case the base is ahead.
 811         mb="$(git merge-base "$_rev_base" "$_rev" 2>/dev/null)"
 812
 813         test -z "$mb" || test "$(rev_parse_tree "$mb")" = "$(rev_parse_tree "$_rev")"
 814         _result=$?
 815         [ -d "$tg_cache_dir/refs/heads/$_branch_name" ] || mkdir -p "$tg_cache_dir/refs/heads/$_branch_name" 2>/dev/null
 816         [ ! -d "$tg_cache_dir/refs/heads/$_branch_name" ] ||
 817         echo $_result $_rev $_rev_base >"$tg_cache_dir/refs/heads/$_branch_name/.ann" 2>/dev/null || :
 818         return $_result
 819 }
 820
 821 non_annihilated_branches()
 822 {
 823         refscacheopt="${TG_DEBUG:+-p=\"\$tg_ref_cache.pre\" }"
 824         if [ -n "$tg_read_only" ] && [ -n "$tg_ref_cache" ] && [ -s "$tg_ref_cache" ]; then
 825                 refscacheopt="$refscacheopt"'-r="$tg_ref_cache" "refs/$topbases"'
 826         fi
 827         eval run_awk_topgit_branches -n "$refscacheopt" '"refs/$topbases" "$@"'
 828 }
 829
 830 # Make sure our tree is clean
 831 # if optional "$1" given also verify that a checkout to "$1" would succeed
 832 ensure_clean_tree()
 833 {
 834         check_status
 835         [ -z "$tg_state$git_state" ] || { do_status; exit 1; }
 836         git update-index --ignore-submodules --refresh ||
 837                 die "the working directory has uncommitted changes (see above) - first commit or reset them"
 838         [ -z "$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)" ] ||
 839                 die "the index has uncommited changes"
 840         [ -z "$1" ] || git read-tree -n -u -m "$1" ||
 841                 die "git checkout \"$1\" would fail"
 842 }
 843
 844 # Make sure .topdeps and .topmsg are "clean"
 845 # They are considered "clean" if each is identical in worktree, index and HEAD
 846 # With "-u" as the argument skip the HEAD check (-u => unborn)
 847 # untracked .topdeps and/or .topmsg files are always considered "dirty" as well
 848 # with -u them just existing constitutes "dirty"
 849 ensure_clean_topfiles()
 850 {
 851         _dirtw=0
 852         _dirti=0
 853         _dirtu=0
 854         _check="$(git diff-files --ignore-submodules --name-only -- :/.topdeps :/.topmsg)" &&
 855         [ -z "$_check" ] || _dirtw=1
 856         if [ "$1" != "-u" ]; then
 857                 _check="$(git diff-index --cached --ignore-submodules --name-only HEAD -- :/.topdeps :/.topmsg)" &&
 858                 [ -z "$_check" ] || _dirti=1
 859         fi
 860         if [ "$_dirti$_dirtw" = "00" ]; then
 861                 v_get_show_cdup
 862                 if [ -e "${git_cdup_result}.topdeps" ] || [ -e "${git_cdup_result}.topmsg" ]; then
 863                         [ "$1" != "-u" ] &&
 864                         _check="$(git status --porcelain --ignored --untracked-files --ignore-submodules -- :/.topdeps :/.topmsg)" &&
 865                         [ -z "$_check" ] || _dirtu=1
 866                 fi
 867         fi
 868         if [ "$_dirtu$_dirti$_dirtw" != "000" ]; then
 869                 git status --ignored --untracked-files --ignore-submodules -- :/.topdeps :/.topmsg || :
 870                 case "$_dirtu$_dirti$_dirtw" in
 871                 001) die "the working directory has uncommitted changes (see above) - first commit or reset them";;
 872                 010) die "the index has uncommited changes (see above)";;
 873                 011) die "the working directory and index have uncommitted changes (see above) - first commit or reset them";;
 874                 100) die "the working directory has untracked files that would be overwritten (see above)";;
 875                 esac
 876         fi
 877 }
 878
 879 # is_sha1 REF
 880 # Whether REF is a SHA1 (compared to a symbolic name).
 881 is_sha1()
 882 {
 883         case "$1" in $octet20) return 0;; esac
 884         return 1
 885 }
 886
 887 # navigate_deps <run_awk_topgit_navigate options and arguments>
 888 # all options and arguments are passed through to run_awk_topgit_navigate
 889 # except for a leading -td= option, if any, which is picked off for deps
 890 # after arranging to feed it a suitable deps list
 891 navigate_deps()
 892 {
 893         dogfer=
 894         dorad=1
 895         userc=
 896         tmpdep=
 897         ratd_opts="${TG_DEBUG:+-p=\"\$tg_ref_cache.pre\" }"
 898         ratn_opts=
 899         if [ -n "$tg_read_only" ] && [ -n "$tg_ref_cache" ]; then
 900                 userc=1
 901                 tmprfs="$tg_ref_cache"
 902                 tmptgbr="$tg_ref_cache_br"
 903                 tmpann="$tg_ref_cache_ann"
 904                 tmpdep="$tg_ref_cache_dep"
 905                 [ -s "$tg_ref_cache" ] || dogfer=1
 906                 [ -n "$dogfer" ] || ! [ -s "$tmptgbr" ] || ! [ -f "$tmpann" ] || ! [ -s "$tmpdep" ] || dorad=
 907         else
 908                 ratd_opts="${ratd_opts}-rmr"
 909                 ratn_opts="-rma -rmb"
 910                 tmprfs="$tg_tmp_dir/refs.$$"
 911                 tmpann="$tg_tmp_dir/ann.$$"
 912                 tmptgbr="$tg_tmp_dir/tgbr.$$"
 913                 dogfer=1
 914         fi
 915         refpats="\"refs/heads\" \"refs/\$topbases\""
 916         [ -z "$base_remote" ] || refpats="$refpats \"refs/remotes/\$base_remote\""
 917         [ -z "$dogfer" ] ||
 918         eval git for-each-ref '--format="%(refname) %(objectname)"' "$refpats" >"$tmprfs"
 919         depscmd="run_awk_topgit_deps $ratd_opts"
 920         case "$1" in -td=*)
 921                 userc=
 922                 depscmd="$depscmd $1"
 923                 shift
 924         esac
 925         depscmd="$depscmd"' -a="$tmpann" -b="$tmptgbr" -r="$tmprfs" -s "refs/$topbases"'
 926         if [ -n "$userc" ]; then
 927                 if [ -n "$dorad" ]; then
 928                         eval "$depscmd" >"$tmpdep"
 929                 fi
 930                 depscmd='<"$tmpdep" '
 931         else
 932                 depscmd="$depscmd |"
 933         fi
 934         eval "$depscmd" run_awk_topgit_navigate '-a="$tmpann" -b="$tmptgbr"' "$ratn_opts" '"$@"'
 935 }
 936
 937 # recurse_deps_internal NAME [BRANCHPATH...]
 938 # get recursive list of dependencies with leading 0 if branch exists 1 if missing
 939 # followed by a 1 if the branch is "tgish" (2 if it also has a remote); 0 if not
 940 # followed by a 0 for a non-leaf, 1 for a leaf or 2 for annihilated tgish
 941 # (but missing and remotes are always "0")
 942 # followed by a 0 for no excess visits or a positive number of excess visits
 943 # then the branch name followed by its depedency chain (which might be empty)
 944 # An output line might look like this:
 945 #   0 1 1 0 t/foo/leaf t/foo/int t/stage
 946 # If no_remotes is non-empty, exclude remotes
 947 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
 948 # If with_top_level is non-empty, include the top-level that's normally omitted
 949 # any branch names in the space-separated recurse_deps_exclude variable
 950 # are skipped (along with their dependencies)
 951 recurse_deps_internal()
 952 {
 953         case " $recurse_deps_exclude " in *" $1 "*) return 0; esac
 954         ratr_opts="${recurse_preorder:+-f} ${with_top_level:+-s}"
 955         dogfer=
 956         dorad=1
 957         userc=
 958         tmpdep=
 959         if [ -n "$tg_read_only" ] && [ -n "$tg_ref_cache" ]; then
 960                 userc=1
 961                 tmprfs="$tg_ref_cache"
 962                 tmptgbr="$tg_ref_cache_br"
 963                 tmpann="$tg_ref_cache_ann"
 964                 tmpdep="$tg_ref_cache_dep"
 965                 [ -s "$tg_ref_cache" ] || dogfer=1
 966                 [ -n "$dogfer" ] || ! [ -s "$tmptgbr" ] || ! [ -f "$tmpann" ] || ! [ -s "$tmpdep" ] || dorad=
 967         else
 968                 ratr_opts="$ratr_opts -rmh -rma -rmb"
 969                 tmprfs="$tg_tmp_dir/refs.$$"
 970                 tmpann="$tg_tmp_dir/ann.$$"
 971                 tmptgbr="$tg_tmp_dir/tgbr.$$"
 972                 dogfer=1
 973         fi
 974         refpats="\"refs/heads\" \"refs/\$topbases\""
 975         [ -z "$base_remote" ] || refpats="$refpats \"refs/remotes/\$base_remote\""
 976         tmptgrmtbr=
 977         dorab=1
 978         if [ -z "$no_remotes" ] && [ -n "$base_remote" ]; then
 979                 if [ -n "$userc" ]; then
 980                         tmptgrmtbr="$tg_ref_cache_rbr"
 981                         [ -n "$dogfer" ] || ! [ -s "$tmptgrmtbr" ] || dorab=
 982                 else
 983                         tmptgrmtbr="$tg_tmp_dir/tgrmtbr.$$"
 984                         ratr_opts="$ratr_opts -rmr"
 985                 fi
 986                 ratr_opts="$ratr_opts -r=\"\$tmptgrmtbr\" -u=\":refs/remotes/\$base_remote/\${topbases#heads/}\""
 987         fi
 988         [ -z "$dogfer" ] ||
 989         eval git for-each-ref '--format="%(refname) %(objectname)"' "$refpats" >"$tmprfs"
 990         if [ -n "$tmptgrmtbr" ] && [ -n "$dorab" ]; then
 991                 run_awk_topgit_branches -n -h="refs/remotes/$base_remote" -r="$tmprfs" \
 992                         "refs/remotes/$base_remote/${topbases#heads/}" >"$tmptgrmtbr"
 993         fi
 994         depscmd="run_awk_topgit_deps -s${TG_DEBUG:+ -p=\"\$tg_ref_cache.pre\"}"
 995         depscmd="$depscmd"' -a="$tmpann" -b="$tmptgbr" -r="$tmprfs" "refs/$topbases"'
 996         if [ -n "$userc" ]; then
 997                 if [ -n "$dorad" ]; then
 998                         eval "$depscmd" >"$tmpdep"
 999                 fi
1000                 depscmd='<"$tmpdep" '
1001         else
1002                 depscmd="$depscmd |"
1003         fi
1004         eval "$depscmd" run_awk_topgit_recurse '-a="$tmpann" -b="$tmptgbr"' \
1005                 '-c=1 -h="$tmprfs"' "$ratr_opts" '-x="$recurse_deps_exclude"' '"$@"'
1006 }
1007
1008 # do_eval CMD
1009 # helper for recurse_deps so that a return statement executed inside CMD
1010 # does not return from recurse_deps.  This shouldn't be necessary, but it
1011 # seems that it actually is.
1012 do_eval()
1013 {
1014         eval "$@"
1015 }
1016
1017 # becomes read-only for caching purposes
1018 # assigns new value to tg_read_only
1019 # become_cacheable/undo_become_cacheable calls may be nested
1020 become_cacheable()
1021 {
1022         _old_tg_read_only="$tg_read_only"
1023         if [ -z "$tg_read_only" ]; then
1024                 ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
1025                 rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
1026                 tg_read_only=1
1027         fi
1028         _my_ref_cache=
1029         v_create_ref_cache _my_ref_cache
1030         _my_ref_cache="${_my_ref_cache:+1}"
1031         tg_read_only="undo${_my_ref_cache:-0}-$_old_tg_read_only"
1032 }
1033
1034 # restores tg_read_only and ref_cache to state before become_cacheable call
1035 # become_cacheable/undo_bocome_cacheable calls may be nested
1036 undo_become_cacheable()
1037 {
1038         case "$tg_read_only" in
1039                 "undo"[01]"-"*)
1040                         _suffix="${tg_read_only#undo?-}"
1041                         [ "${tg_read_only%$_suffix}" = "undo0-" ] || remove_ref_cache
1042                         tg_read_only="$_suffix"
1043         esac
1044 }
1045
1046 # just call this, no undo, sets tg_read_only= and removes ref cache and cached results
1047 become_non_cacheable()
1048 {
1049         remove_ref_cache
1050         tg_read_only=
1051         ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
1052         rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
1053 }
1054
1055 # call this to make sure the current Git repository has an associated work tree
1056 # also make sure we are not in wayback mode
1057 ensure_work_tree()
1058 {
1059         [ -z "$wayback" ] ||
1060         die "the wayback machine cannot be used with the specified options"
1061         setup_git_dir_is_bare
1062         [ -n "$git_dir_is_bare" ] || return 0
1063         die "This operation must be run in a work tree"
1064 }
1065
1066 # call this to make sure Git will not complain about a missing user/email
1067 # result is cached in TG_IDENT_CHECKED and a non-empty value suppresses the check
1068 ensure_ident_available()
1069 {
1070         [ -z "$TG_IDENT_CHECKED" ] || return 0
1071         git var GIT_AUTHOR_IDENT >/dev/null &&
1072         git var GIT_COMMITTER_IDENT >/dev/null || exit
1073         TG_IDENT_CHECKED=1
1074         export TG_IDENT_CHECKED
1075         return 0
1076 }
1077
1078 # recurse_deps [-o=<options string>] CMD NAME [BRANCHPATH...]
1079 # Recursively eval CMD on all dependencies of NAME.
1080 # Dependencies are visited in topological order.
1081 # If <options string> is given, it's eval'd into the recurse_deps_internal
1082 # call just before the "--" that's passed just before NAME
1083 # CMD can refer to the following variables:
1084 #
1085 #   _ret              starts as 0; CMD can change; will be final return result
1086 #   _dep              bare branch name or ":refs/remotes/..." for a remote
1087 #   _name             has $_dep in its .topdeps ("" for top and $with_top_level)
1088 #   _depchain         0+ space-sep branch names (_name first) form a path to top
1089 #   _dep_missing      boolean "1" if no such $_dep ref; "" if ref present
1090 #   _dep_is_leaf      boolean "1" if leaf; "" if not
1091 #   _dep_is_tgish     boolean "1" if tgish; "" if not (which implies no remote)
1092 #   _dep_has_remote   boolean "1" if $_dep has_remote; "" if not
1093 #   _dep_annihilated  boolean "1" if $_dep annihilated; "" if not
1094 #   _dep_xvisits      non-negative integer number of excess visits (often 0)
1095 #
1096 # CMD may use a "return" statement without issue; its return value is ignored,
1097 # but if CMD sets _ret to a negative value, e.g. "-0" or "-1" the enumeration
1098 # will stop immediately and the value with the leading "-" stripped off will
1099 # be the final result code
1100 #
1101 # CMD can refer to $_name for queried branch name,
1102 # $_dep for dependency name,
1103 # $_depchain for space-seperated branch backtrace,
1104 # $_dep_missing boolean to check whether $_dep is present
1105 # and the $_dep_is_tgish and $_dep_annihilated booleans.
1106 # If recurse_preorder is NOT set then the $_dep_is_leaf boolean is also valid.
1107 # It can modify $_ret to affect the return value
1108 # of the whole function.
1109 # If recurse_deps() hits missing dependencies, it will append
1110 # them to space-separated $missing_deps list and skip them
1111 # after calling CMD with _dep_missing set.
1112 # remote dependencies are processed if no_remotes is unset.
1113 # any branch names in the space-separated recurse_deps_exclude variable
1114 # are skipped (along with their dependencies)
1115 #
1116 # If no_remotes is non-empty, exclude remotes
1117 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
1118 # If with_top_level is non-empty, include the top-level that's normally omitted
1119 # any branch names in the space-separated recurse_deps_exclude variable
1120 # are skipped (along with their dependencies)
1121 recurse_deps()
1122 {
1123         _opts=
1124         case "$1" in -o=*) _opts="${1#-o=}"; shift; esac
1125         _cmd="$1"; shift
1126
1127         _depsfile="$(get_temp tg-depsfile)"
1128         eval recurse_deps_internal "$_opts" -- '"$@"' >"$_depsfile" || :
1129
1130         _ret=0
1131         while read _ismissing _istgish _isleaf _dep_xvisits _dep _name _deppath; do
1132                 _depchain="$_name${_deppath:+ $_deppath}"
1133                 _dep_is_tgish=
1134                 [ "$_istgish" = "0" ] || _dep_is_tgish=1
1135                 _dep_has_remote=
1136                 [ "$_istgish" != "2" ] || _dep_has_remote=1
1137                 _dep_missing=
1138                 if [ "$_ismissing" != "0" ]; then
1139                         _dep_missing=1
1140                         case " $missing_deps " in *" $_dep "*);;*)
1141                                 missing_deps="${missing_deps:+$missing_deps }$_dep"
1142                         esac
1143                 fi
1144                 _dep_annihilated=
1145                 _dep_is_leaf=
1146                 if [ "$_isleaf" = "1" ]; then
1147                         _dep_is_leaf=1
1148                 elif [ "$_isleaf" = "2" ]; then
1149                         _dep_annihilated=1
1150                 fi
1151                 do_eval "$_cmd" || :
1152                 if [ "${_ret#-}" != "$_ret" ]; then
1153                         _ret="${_ret#-}"
1154                         break
1155                 fi
1156         done <"$_depsfile"
1157         rm -f "$_depsfile"
1158         return ${_ret:-0}
1159 }
1160
1161 # find_leaves NAME
1162 # output (one per line) the unique leaves of NAME
1163 # a leaf is either
1164 #   1) a non-tgish dependency
1165 #   2) the base of a tgish dependency with no non-annihilated dependencies
1166 # duplicates are suppressed (by commit rev) and remotes are always ignored
1167 # if a leaf has an exact tag match that will be output
1168 # note that recurse_deps_exclude IS honored for this operation
1169 find_leaves()
1170 {
1171         no_remotes=1
1172         with_top_level=1
1173         recurse_preorder=
1174         seen_leaf_refs=
1175         seen_leaf_revs=
1176         while read _ismissing _istgish _isleaf _dep _name _deppath; do
1177                 [ "$_isleaf" = "1" ] && [ "$_ismissing" = "0" ] || continue
1178                 if [ "$_istgish" != "0" ]; then
1179                         fulldep="refs/$topbases/$_dep"
1180                 else
1181                         fulldep="refs/heads/$_dep"
1182                 fi
1183                 case " $seen_leaf_refs " in *" $fulldep "*);;*)
1184                         seen_leaf_refs="${seen_leaf_refs:+$seen_leaf_refs }$fulldep"
1185                         if fullrev="$(ref_exists_rev "$fulldep")"; then
1186                                 case " $seen_leaf_revs " in *" $fullrev "*);;*)
1187                                         seen_leaf_revs="${seen_leaf_revs:+$seen_leaf_revs }$fullrev"
1188                                         # See if Git knows it by another name
1189                                         if tagname="$(git describe --exact-match "$fullrev" 2>/dev/null)" && [ -n "$tagname" ]; then
1190                                                 echo "refs/tags/$tagname"
1191                                         else
1192                                                 echo "$fulldep"
1193                                         fi
1194                                 esac
1195                         fi
1196                 esac
1197         done <<-EOT
1198         $(recurse_deps_internal -l -o=1 -- "$1")
1199         EOT
1200         with_top_level=
1201 }
1202
1203 # branch_needs_update
1204 # This is a helper function for determining whether given branch
1205 # is up-to-date wrt. its dependencies. It expects input as if it
1206 # is called as a recurse_deps() helper.
1207 # In case the branch does need update, it will echo it together
1208 # with the branch backtrace on the output (see needs_update()
1209 # description for details) and set $_ret to non-zero.
1210 branch_needs_update()
1211 {
1212         if [ -n "$_dep_missing" ]; then
1213                 echo "! $_dep $_depchain"
1214                 return 0
1215         fi
1216
1217         if [ -n "$_dep_is_tgish" ]; then
1218                 [ -z "$_dep_annihilated" ] || return 0
1219
1220                 if [ -n "$_dep_has_remote" ]; then
1221                         branch_contains "refs/heads/$_dep" "refs/remotes/$base_remote/$_dep" || {
1222                                 echo ":refs/remotes/$base_remote/$_dep $_dep $_depchain"
1223                                 _ret=1
1224                         }
1225                 fi
1226                 # We want to sync with our base first and should output this before
1227                 # the remote branch, but the order does not actually matter to tg-update
1228                 # as it just recurses regardless, but it does matter for tg-info (which
1229                 # treats out-of-date bases as though they were already merged in) so
1230                 # we output the remote before the base.
1231                 branch_contains "refs/heads/$_dep" "refs/$topbases/$_dep" || {
1232                         echo ": $_dep $_depchain"
1233                         _ret=1
1234                         return
1235                 }
1236         fi
1237
1238         if [ -n "$_name" ]; then
1239                 case "$_dep" in :*) _fulldep="${_dep#:}";; *) _fulldep="refs/heads/$_dep";; esac
1240                 if ! branch_contains "refs/$topbases/$_name" "$_fulldep"; then
1241                         # Some new commits in _dep
1242                         echo "$_dep $_depchain"
1243                         _ret=1
1244                 fi
1245         fi
1246 }
1247
1248 # needs_update NAME
1249 # This function is recursive; it outputs reverse path from NAME
1250 # to the branch (e.g. B_DIRTY B1 B2 NAME), one path per line,
1251 # inner paths first. Innermost name can be :refs/remotes/<remote>/<name>
1252 # if the head is not in sync with the <remote> branch <name>, ':' if
1253 # the head is not in sync with the base (in this order of priority)
1254 # or '!' if dependency is missing.  Note that the remote branch, base
1255 # order is reversed from the order they will actually be updated in
1256 # order to accomodate tg info which treats out-of-date items that are
1257 # only in the base as already being in the head for status purposes.
1258 # It will also return non-zero status if NAME needs update (seems backwards
1259 # but think of it as non-zero status if any non-missing output lines produced)
1260 # If needs_update() hits missing dependencies, it will append
1261 # them to space-separated $missing_deps list and skip them.
1262 needs_update()
1263 {
1264         recurse_deps branch_needs_update "$1"
1265 }
1266
1267 # append second arg to first arg variable gluing with space if first already set
1268 vplus()
1269 {
1270         eval "$1=\"\${$1:+\$$1 }\$2\""
1271 }
1272
1273 # true if whitespace separated first var name list contains second arg
1274 # use `vcontains 3 "value" "some list"` for a literal list
1275 vcontains()
1276 {
1277         eval case "\" \${$1} \"" in '*" $2 "*) return 0; esac; return 1'
1278 }
1279
1280 # if the $1 var does not already contain $2 it's appended
1281 vsetadd()
1282 {
1283         vcontains "$1" "$2" || vplus "$1" "$2"
1284 }
1285
1286 # reset needs_update_check results to empty
1287 needs_update_check_clear()
1288 {
1289         unset_ needs_update_processed needs_update_behind needs_update_ahead needs_update_partial
1290 }
1291
1292 # needs_update_check NAME...
1293 #
1294 # A faster version of needs_update that always succeeds
1295 # No output and unsuitable for actually performing updates themselves
1296 # If any of NAME... are NOT up-to-date AND they were not already processed
1297 # return status always will be zero however a simple check of
1298 # needs_update_behind after the call will answer the:
1299 #   "are any out of date?": test -n "$needs_update_behind"
1300 #   "is <x> out of date?":  vcontains needs_update_behind "<x>"
1301 #
1302 # Note that results are cumulative and "no_remotes" is honored as well as other
1303 # variables that modify recurse_deps_internal behavior.  See the preceding
1304 # function to reset the results to empty when accumulation should start over.
1305 #
1306 # Unlike needs_update, the branch names are themselves also checked to see if
1307 # they are out-of-date with respect to their bases or remote branches (not just
1308 # their remote bases).  However, this can muddy some status results so this
1309 # can be disabled by setting needs_update_check_no_self to a non-empty value.
1310 #
1311 # Unlike needs_update, here the remote base check is handled together with the
1312 # remote head check so if one is modified the other is too in the same way.
1313 #
1314 # Dependencies are normally considered "behind" if they need an update from
1315 # their base or remote but this can be suppressed by setting the
1316 # needs_update_check_no_same to a non-empty value.  This will NOT prevent
1317 # parents of those dependencies from still being considered behind in such a
1318 # case even though the dependency itself will not be.  Note that setting
1319 # needs_update_check_no_same also implies needs_update_check_no_self.
1320 #
1321 # The following whitespace-separated lists are updated with the results:
1322 #
1323 # The "no_remotes" setting is obeyed but remote names themselves will never
1324 # appear in any of the lists
1325 #
1326 #   needs_update_processed
1327 #       The branch names in here have been processed and will be skipped
1328 #
1329 #   needs_update_behind
1330 #       Any branch named in here needs an update from one or more of its
1331 #       direct or indirect dependencies (i.e. it's "out-of-date")
1332 #
1333 #   needs_update_ahead
1334 #       Any branch named in here is NOT fully contained by at least one of
1335 #       its dependents (i.e. it's a source of "out-of-date (aka dirty)"ness
1336 #
1337 #   needs_update_partial
1338 #       Any branch names in here are either missing themselves or have one
1339 #       or more detected missing dependencies (a completely missing remote
1340 #       branch is never "detected")
1341 needs_update_check()
1342 {
1343         # each head must be processed independently or else there will be
1344         # confusion about who's missing what and which branches actually are
1345         # out of date
1346         tmptgrdi="$tg_tmp_dir/tgrdi.$$"
1347         for nucname in "$@"; do
1348                 ! vcontains needs_update_processed "$nucname" || continue
1349                 # no need to fuss with recurse_deps, just use
1350                 # recurse_deps_internal directly
1351                 recurse_deps_internal -s -o=-1 "$nucname" >"$tmptgrdi"
1352                 while read -r _rdi_m _rdi_t _rdi_l _rdi_v _rdi_node _rdi_parent _rdi_chain; do
1353                         case "$_rdi_node" in ""|:*) continue; esac # empty or checked with remote
1354                         vsetadd needs_update_processed "$_rdi_node"
1355                         if [ "$_rdi_m" != "0" ]; then # missing
1356                                 vsetadd needs_update_partial "$_rdi_node"
1357                                 [ -z "$_rdi_parent" ] || vsetadd needs_update_partial "$_rdi_parent"
1358                                 continue
1359                         fi
1360                         [ "$_rdi_t$_rdi_l" != "12" ] || continue # always skip annihilated
1361                         _rdi_dertee= # :)
1362                         if [ -n "$_rdi_parent" ]; then # not a "self" line
1363                                 ! vcontains needs_update_partial "$_rdi_node" || vsetadd needs_update_partial "$_rdi_parent"
1364                                 ! vcontains needs_update_behind "$_rdi_node" || _rdi_dertee=2
1365                         else
1366                                 [ -z "$needs_update_check_no_self$needs_update_check_no_same" ] || continue # skip self
1367                         fi
1368                         if [ -z "$_rdi_dertee" ]; then
1369                                 if [ "$_rdi_t" != "0" ]; then # tgish
1370                                         if branch_contains "refs/heads/$_rdi_node" "refs/$topbases/$_rdi_node"; then
1371                                                 if [ "$_rdi_t" = "2" ]; then # will never be "2" when no_remotes is set
1372                                                         branch_contains "refs/heads/$_rdi_node" "refs/remotes/$base_remote/$_rdi_node" &&
1373                                                         branch_contains "refs/$topbases/$_rdi_node" "refs/remotes/$base_remote/${topbases#heads/}/$_rdi_node" ||
1374                                                         _rdi_dertee=3
1375                                                 fi
1376                                         else
1377                                                 _rdi_dertee=3
1378                                         fi
1379                                         [ -z "$_rdi_dertee" ] || [ -n "$needs_update_check_no_same" ] || _rdi_dertee=1
1380                                 fi
1381                         fi
1382                         [ z"$_rdi_dertee" != z"1" ] || vsetadd needs_update_behind "$_rdi_node"
1383                         [ -n "$_rdi_parent" ] || continue # self line
1384                         if ! branch_contains "refs/$topbases/$_rdi_parent" "refs/heads/$_rdi_node"; then
1385                                 _rdi_dertee=1
1386                                 vsetadd needs_update_ahead "$_rdi_node"
1387                         fi
1388                         [ -z "$_rdi_dertee" ] || vsetadd needs_update_behind "$_rdi_parent"
1389                 done <"$tmptgrdi"
1390         done
1391 }
1392
1393 # branch_empty NAME [-i | -w]
1394 branch_empty()
1395 {
1396         if [ -z "$2" ]; then
1397                 _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
1398                 _result=
1399                 _result_rev=
1400                 { read -r _result _result_rev <"$tg_cache_dir/refs/heads/$1/.mt"; } 2>/dev/null || :
1401                 [ -z "$_result" -o "$_result_rev" != "$_rev" ] || return $_result
1402                 _result=0
1403                 [ "$(pretty_tree -t "$1" -b)" = "$(pretty_tree -t "$1" $2)" ] || _result=$?
1404                 [ -d "$tg_cache_dir/refs/heads/$1" ] || mkdir -p "$tg_cache_dir/refs/heads/$1" 2>/dev/null
1405                 [ ! -d "$tg_cache_dir/refs/heads/$1" ] || echo $_result $_rev >"$tg_cache_dir/refs/heads/$1/.mt"
1406                 return $_result
1407         else
1408                 [ "$(pretty_tree -t "$1" -b)" = "$(pretty_tree -t "$1" $2)" ]
1409         fi
1410 }
1411
1412 v_get_tdmopt_internal()
1413 {
1414         [ -n "$1" ] && [ -n "$3" ] || return 0
1415         [ "$2" = "-i" ] || [ "$2" = "-w" ] || return 0
1416         ensure_work_tree
1417         _optval=
1418         if v_verify_topgit_branch _tghead "HEAD" -f; then
1419                 if [ "$2" = "-w" ] && [ -f "$root_dir/$3" ] && [ -r "$root_dir/$3" ]; then
1420                         _opthash=
1421                         if _opthash="$(git hash-object -w -t blob --stdin <"$root_dir/$3")" && [ -n "$_opthash" ]; then
1422                                 _optval="$4\"$_tghead:$_opthash\""
1423                         fi
1424                 elif [ "$2" = "-i" ]; then
1425                         if _opthash="$(git rev-parse --quiet --verify ":0:$3" --)" && [ -n "$_opthash" ]; then
1426                                 _optval="$4\"$_tghead:$_opthash\""
1427                         fi
1428                 fi
1429         fi
1430         eval "$1="'"$_optval"'
1431 }
1432
1433 # set var $1 to the correct -td= option for use in an eval for $2 -i or -w mode
1434 v_get_tdopt() { v_get_tdmopt_internal "$1" "$2" ".topdeps" "-td="; }
1435
1436 # set var $1 to the correct -tm= option for use in an eval for $2 -i or -w mode
1437 v_get_tmopt() { v_get_tdmopt_internal "$1" "$2" ".topmsg" "-tm="; }
1438
1439 # checkout_symref_full [-f] FULLREF [SEED]
1440 # Just like git checkout $iowopt -b FULLREF [SEED] except that FULLREF MUST start with
1441 # refs/ and HEAD is ALWAYS set to a symref to it and [SEED] (default is FULLREF)
1442 # MUST be a committish which if present will be used instead of current FULLREF
1443 # (and FULLREF will be updated to it as well in that case)
1444 # Any merge state is always cleared by this function
1445 # With -f it's like git checkout $iowopt -f -b FULLREF (uses read-tree --reset
1446 # instead of -m) but it will clear out any unmerged entries
1447 # As an extension, FULLREF may also be a full hash to create a detached HEAD instead
1448 checkout_symref_full()
1449 {
1450         _mode=-m
1451         _head="HEAD"
1452         if [ "$1" = "-f" ]; then
1453                 _mode="--reset"
1454                 _head=
1455                 shift
1456         fi
1457         _ishash=
1458         case "$1" in
1459                 refs/?*)
1460                         ;;
1461                 $octet20)
1462                         _ishash=1
1463                         [ -z "$2" ] || [ "$1" = "$2" ] ||
1464                                 die "programmer error: invalid checkout_symref_full \"$1\" \"$2\""
1465                         set -- HEAD "$1"
1466                         ;;
1467                 *)
1468                         die "programmer error: invalid checkout_symref_full \"$1\""
1469                         ;;
1470         esac
1471         _seedrev="$(git rev-parse --quiet --verify "${2:-$1}^0" --)" ||
1472                 die "invalid committish: \"${2:-$1}\""
1473         # Clear out any MERGE_HEAD kruft
1474         rm -f "$git_dir/MERGE_HEAD" || :
1475         # We have to do all the hard work ourselves :/
1476         # This is like git checkout -b "$1" "$2"
1477         # (or just git checkout "$1"),
1478         # but never creates a detached HEAD (unless $1 is a hash)
1479         git read-tree -u $_mode $_head "$_seedrev" &&
1480         {
1481                 [ -z "$2" ] && [ "$(git cat-file -t "$1")" = "commit" ] ||
1482                 git update-ref ${_ishash:+--no-deref} "$1" "$_seedrev"
1483         } && {
1484                 [ -n "$_ishash" ] || git symbolic-ref HEAD "$1"
1485         }
1486 }
1487
1488 # switch_to_base NAME [SEED]
1489 switch_to_base()
1490 {
1491         checkout_symref_full "refs/$topbases/$1" "$2"
1492 }
1493
1494 # run editor with arguments
1495 # the editor setting will be cached in $tg_editor (which is eval'd)
1496 # result non-zero if editor fails or GIT_EDITOR cannot be determined
1497 # just in case, noalt_setup will be in effect while the editor is running
1498 run_editor()
1499 {
1500         tg_editor="$GIT_EDITOR"
1501         [ -n "$tg_editor" ] || tg_editor="$(git var GIT_EDITOR)" || return $?
1502         (
1503                 noalt_setup
1504                 eval "$tg_editor" '"$@"'
1505         )
1506 }
1507
1508 # Show the help messages.
1509 do_help()
1510 {
1511         _www=
1512         if [ "$1" = "-w" ]; then
1513                 _www=1
1514                 shift
1515         fi
1516         if [ -z "$1" ] ; then
1517                 # This is currently invoked in all kinds of circumstances,
1518                 # including when the user made a usage error. Should we end up
1519                 # providing more than a short help message, then we should
1520                 # differentiate.
1521                 # Petr's comment: http://marc.info/?l=git&m=122718711327376&w=2
1522
1523                 ## Build available commands list for help output
1524
1525                 cmds=
1526                 sep=
1527                 for cmd in "$TG_INST_CMDDIR"/tg-[!-]*; do
1528                         ! [ -r "$cmd" ] && continue
1529                         # strip directory part and "tg-" prefix
1530                         cmd="${cmd##*/}"
1531                         cmd="${cmd#tg-}"
1532                         [ "$cmd" != "migrate-bases" ] || continue
1533                         [ "$cmd" != "summary" ] || cmd="st[atus]|$cmd"
1534                         cmds="$cmds$sep$cmd"
1535                         sep="|"
1536                 done
1537
1538                 echo "TopGit version $TG_VERSION - A different patch queue manager"
1539                 echo "Usage: $tgname [-C <dir>] [-r <remote> | -u]" \
1540                         "[-c <name>=<val>] [--[no-]pager|-p] [-w [:]<tgtag>] ($cmds) ..."
1541                 echo "   Or: $tgname help [-w] [<command>]"
1542                 echo "Use \"$tgdisplaydir$tgname help tg\" for overview of TopGit"
1543         elif [ -r "$TG_INST_CMDDIR"/tg-$1 -o -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1544                 if [ -n "$_www" ]; then
1545                         nohtml=
1546                         if ! [ -r "$TG_INST_SHAREDIR/topgit.html" ]; then
1547                                 echo "${0##*/}: missing html help file:" \
1548                                         "$TG_INST_SHAREDIR/topgit.html" 1>&2
1549                                 nohtml=1
1550                         fi
1551                         if ! [ -r "$TG_INST_SHAREDIR/tg-$1.html" ]; then
1552                                 echo "${0##*/}: missing html help file:" \
1553                                         "$TG_INST_SHAREDIR/tg-$1.html" 1>&2
1554                                 nohtml=1
1555                         fi
1556                         if [ -n "$nohtml" ]; then
1557                                 echo "${0##*/}: use" \
1558                                         "\"${0##*/} help $1\" instead" 1>&2
1559                                 exit 1
1560                         fi
1561                         git web--browse -c help.browser "$TG_INST_SHAREDIR/tg-$1.html"
1562                         exit
1563                 fi
1564                 output()
1565                 {
1566                         if [ -r "$TG_INST_CMDDIR"/tg-$1 ] ; then
1567                                 "$TG_INST_CMDDIR"/tg-$1 -h 2>&1 || :
1568                                 echo
1569                         elif [ "$1" = "help" ]; then
1570                                 echo "Usage: ${tgname:-tg} help [-w] [<command>]"
1571                                 echo
1572                         elif [ "$1" = "status" ] || [ "$1" = "st" ]; then
1573                                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1574                                 echo
1575                         fi
1576                         if [ -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1577                                 cat "$TG_INST_SHAREDIR/tg-$1.txt"
1578                         fi
1579                 }
1580                 page output "$1"
1581         else
1582                 echo "${0##*/}: no help for $1" 1>&2
1583                 do_help
1584                 exit 1
1585         fi
1586 }
1587
1588 check_status()
1589 {
1590         git_state=
1591         git_remove=
1592         tg_state=
1593         tg_remove=
1594         tg_topmerge=
1595         setup_git_dir_is_bare
1596         [ -z "$git_dir_is_bare" ] || return 0
1597
1598         if [ -e "$git_dir/MERGE_HEAD" ]; then
1599                 git_state="merge"
1600         elif [ -e "$git_dir/rebase-apply/applying" ]; then
1601                 git_state="am"
1602                 git_remove="$git_dir/rebase-apply"
1603         elif [ -e "$git_dir/rebase-apply" ]; then
1604                 git_state="rebase"
1605                 git_remove="$git_dir/rebase-apply"
1606         elif [ -e "$git_dir/rebase-merge" ]; then
1607                 git_state="rebase"
1608                 git_remove="$git_dir/rebase-merge"
1609         elif [ -e "$git_dir/CHERRY_PICK_HEAD" ]; then
1610                 git_state="cherry-pick"
1611         elif [ -e "$git_dir/BISECT_LOG" ]; then
1612                 git_state="bisect"
1613         elif [ -e "$git_dir/REVERT_HEAD" ]; then
1614                 git_state="revert"
1615         fi
1616         git_remove="${git_remove#./}"
1617
1618         if [ -e "$git_dir/tg-update" ]; then
1619                 tg_state="update"
1620                 tg_remove="$git_dir/tg-update"
1621                 ! [ -s "$git_dir/tg-update/merging_topfiles" ] || tg_topmerge=1
1622         fi
1623         tg_remove="${tg_remove#./}"
1624 }
1625
1626 # Show status information
1627 do_status()
1628 {
1629         do_status_result=0
1630         do_status_verbose=
1631         do_status_help=
1632         abbrev=refs
1633         pfx=
1634         while [ $# -gt 0 ] && case "$1" in
1635                 --help|-h)
1636                         do_status_help=1
1637                         break;;
1638                 -vv)
1639                         # kludge in this common bundling option
1640                         abbrev=
1641                         do_status_verbose=1
1642                         pfx="## "
1643                         ;;
1644                 --verbose|-v)
1645                         [ -z "$do_status_verbose" ] || abbrev=
1646                         do_status_verbose=1
1647                         pfx="## "
1648                         ;;
1649                 --exit-code)
1650                         do_status_result=2
1651                         ;;
1652                 *)
1653                         die "unknown status argument: $1"
1654                         ;;
1655         esac; do shift; done
1656         if [ -n "$do_status_help" ]; then
1657                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1658                 return
1659         fi
1660         check_status
1661         symref="$(git symbolic-ref --quiet HEAD)" || :
1662         headrv="$(git rev-parse --quiet --verify ${abbrev:+--short} HEAD --)" || :
1663         if [ -n "$symref" ]; then
1664                 uprefpart=
1665                 if [ -n "$headrv" ]; then
1666                         upref="$(git rev-parse --symbolic-full-name @{upstream} 2>/dev/null)" || :
1667                         if [ -n "$upref" ]; then
1668                                 uprefpart=" ... ${upref#$abbrev/remotes/}"
1669                                 mbase="$(git merge-base HEAD "$upref")" || :
1670                                 ahead="$(git rev-list --count HEAD ${mbase:+--not $mbase})" || ahead=0
1671                                 behind="$(git rev-list --count "$upref" ${mbase:+--not $mbase})" || behind=0
1672                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart ["
1673                                 [ "$ahead" = "0" ] || uprefpart="${uprefpart}ahead $ahead"
1674                                 [ "$ahead" = "0" ] || [ "$behind" = "0" ] || uprefpart="$uprefpart, "
1675                                 [ "$behind" = "0" ] || uprefpart="${uprefpart}behind $behind"
1676                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart]"
1677                         fi
1678                 fi
1679                 echol "${pfx}HEAD -> ${symref#$abbrev/heads/} [${headrv:-unborn}]$uprefpart"
1680         else
1681                 echol "${pfx}HEAD -> ${headrv:-?}"
1682         fi
1683         if [ -n "$tg_state" ]; then
1684                 extra=
1685                 if [ "$tg_state" = "update" ]; then
1686                         IFS= read -r uname <"$git_dir/tg-update/name" || :
1687                         [ -z "$uname" ] ||
1688                         extra="; currently updating branch '$uname'"
1689                 fi
1690                 echol "${pfx}tg $tg_state in progress$extra"
1691                 if [ -s "$git_dir/tg-update/fullcmd" ] && [ -s "$git_dir/tg-update/names" ]; then
1692                         printf "${pfx}You are currently updating as a result of:\n${pfx}  "
1693                         cat "$git_dir/tg-update/fullcmd"
1694                         bcnt="$(( $(wc -w < "$git_dir/tg-update/names") ))"
1695                         if [ $bcnt -gt 1 ]; then
1696                                 pcnt=0
1697                                 ! [ -s "$git_dir/tg-update/processed" ] ||
1698                                 pcnt="$(( $(wc -w < "$git_dir/tg-update/processed") ))"
1699                                 echo "${pfx}$pcnt of $bcnt branches updated so far"
1700                         fi
1701                 fi
1702                 if [ "$tg_state" = "update" ]; then
1703                         echol "${pfx}  (use \"$tgdisplayac update --continue\" to continue)"
1704                         echol "${pfx}  (use \"$tgdisplayac update --skip\" to skip this branch and continue)"
1705                         echol "${pfx}  (use \"$tgdisplayac update --stop\" to stop and retain changes so far)"
1706                         echol "${pfx}  (use \"$tgdisplayac update --abort\" to restore pre-update state)"
1707                 fi
1708         fi
1709         [ -z "$git_state" ] || echo "${pfx}git $git_state in progress"
1710         if [ "$git_state" = "merge" ]; then
1711                 ucnt="$(( $(git ls-files --unmerged --full-name --abbrev :/ | wc -l) ))"
1712                 if [ $ucnt -gt 0 ]; then
1713                         echo "${pfx}"'fix conflicts and then "git commit" the result'
1714                 else
1715                         echo "${pfx}"'all conflicts fixed; run "git commit" to record result'
1716                 fi
1717         fi
1718         if [ -z "$git_state" ]; then
1719                 setup_git_dir_is_bare
1720                 [ -z "$git_dir_is_bare" ] || return 0
1721                 gsp="$(git status --porcelain 2>/dev/null)" || return 0 # bare repository???
1722                 gspcnt=0
1723                 [ -z "$gsp" ] ||
1724                 gspcnt="$(( $(printf '%s\n' "$gsp" | sed -n '/^??/!p' | wc -l) ))"
1725                 untr=
1726                 if [ "$gspcnt" -eq 0 ]; then
1727                         [ -z "$gsp" ] || untr="; non-ignored, untracked files present"
1728                         echo "${pfx}working directory is clean$untr"
1729                         [ -n "$tg_state" ] || do_status_result=0
1730                 else
1731                         echo "${pfx}working directory is DIRTY"
1732                         [ -z "$do_status_verbose" ] || git status --short --untracked-files=no
1733                 fi
1734         fi
1735 }
1736
1737 ## Pager stuff
1738
1739 # isatty FD
1740 isatty()
1741 {
1742         test -t $1
1743 }
1744
1745 # pass "diff" to get pager.diff
1746 # if pager.$1 is a boolean false returns cat
1747 # if set to true or unset fails
1748 # otherwise succeeds and returns the value
1749 get_pager()
1750 {
1751         if _x="$(git config --bool "pager.$1" 2>/dev/null)"; then
1752                 [ "$_x" != "true" ] || return 1
1753                 echo "cat"
1754                 return 0
1755         fi
1756         if _x="$(git config "pager.$1" 2>/dev/null)"; then
1757                 echol "$_x"
1758                 return 0
1759         fi
1760         return 1
1761 }
1762
1763 # setup_pager
1764 # Set TG_PAGER to a valid executable
1765 # After calling, code to be paged should be surrounded with {...} | eval "$TG_PAGER"
1766 # See also the following "page" function for ease of use
1767 # emptypager will be set to 1 (otherwise empty) if TG_PAGER was set to "cat" to not be empty
1768 # Preference is (same as Git):
1769 #   1. GIT_PAGER
1770 #   2. pager.$USE_PAGER_TYPE (but only if USE_PAGER_TYPE is set and so is pager.$USE_PAGER_TYPE)
1771 #   3. core.pager (only if set)
1772 #   4. PAGER
1773 #   5. git var GIT_PAGER
1774 #   6. less
1775 setup_pager()
1776 {
1777         isatty 1 || { emptypager=1; TG_PAGER=cat; return 0; }
1778
1779         emptypager=
1780         if [ -z "$TG_PAGER_IN_USE" ]; then
1781                 # TG_PAGER = GIT_PAGER | PAGER | less
1782                 # NOTE: GIT_PAGER='' is significant
1783                 if [ -n "${GIT_PAGER+set}" ]; then
1784                         TG_PAGER="$GIT_PAGER"
1785                 elif [ -n "$USE_PAGER_TYPE" ] && _dp="$(get_pager "$USE_PAGER_TYPE")"; then
1786                         TG_PAGER="$_dp"
1787                 elif _cp="$(git config core.pager 2>/dev/null)"; then
1788                         TG_PAGER="$_cp"
1789                 elif [ -n "${PAGER+set}" ]; then
1790                         TG_PAGER="$PAGER"
1791                 else
1792                         _gp="$(git var GIT_PAGER 2>/dev/null)" || :
1793                         [ "$_gp" != ":" ] || _gp=
1794                         TG_PAGER="${_gp:-less}"
1795                 fi
1796                 if [ -z "$TG_PAGER" ]; then
1797                         emptypager=1
1798                         TG_PAGER=cat
1799                 fi
1800         else
1801                 emptypager=1
1802                 TG_PAGER=cat
1803         fi
1804
1805         # Set pager default environment variables
1806         # see pager.c:setup_pager
1807         if [ -z "${LESS+set}" ]; then
1808                 LESS="-FRX"
1809                 export LESS
1810         fi
1811         if [ -z "${LV+set}" ]; then
1812                 LV="-c"
1813                 export LV
1814         fi
1815
1816         # this is needed so e.g. $(git diff) will still colorize it's output if
1817         # requested in ~/.gitconfig with color.diff=auto
1818         GIT_PAGER_IN_USE=1
1819         export GIT_PAGER_IN_USE
1820
1821         # this is needed so we don't get nested pagers
1822         TG_PAGER_IN_USE=1
1823         export TG_PAGER_IN_USE
1824 }
1825
1826 # page eval_arg [arg ...]
1827 #
1828 # Calls setup_pager then evals the first argument passing it all the rest
1829 # where the output is piped through eval "$TG_PAGER" unless emptypager is set
1830 # by setup_pager (in which case the output is left as-is).
1831 #
1832 # To handle arbitrary paging duties, collect lines to be paged into a
1833 # function and then call page with the function name or perhaps func_name "$@".
1834 #
1835 # If no arguments at all are passed in do nothing (return with success).
1836 page()
1837 {
1838         [ $# -gt 0 ] || return 0
1839         setup_pager
1840         _evalarg="$1"; shift
1841         if [ -n "$emptypager" ]; then
1842                 eval "$_evalarg" '"$@"'
1843         else
1844                 { eval "$_evalarg" '"$@"';} | eval "$TG_PAGER"
1845         fi
1846 }
1847
1848 # get_temp NAME [-d]
1849 # creates a new temporary file (or directory with -d) in the global
1850 # temporary directory $tg_tmp_dir with pattern prefix NAME
1851 get_temp()
1852 {
1853         mktemp $2 "$tg_tmp_dir/$1.XXXXXX"
1854 }
1855
1856 # automatically called by strftime
1857 # does nothing if already setup
1858 # may be called explicitly if the first call would otherwise be in a subshell
1859 # so that the setup is only done once before subshells start being spawned
1860 setup_strftime()
1861 {
1862         [ -z "$strftime_is_setup" ] || return 0
1863
1864         # date option to format raw epoch seconds values
1865         daterawopt=
1866         _testes='951807788'
1867         _testdt='2000-02-29 07:03:08 UTC'
1868         _testfm='%Y-%m-%d %H:%M:%S %Z'
1869         if [ "$(TZ=UTC date "-d@$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1870                 daterawopt='-d@'
1871         elif [ "$(TZ=UTC date "-r$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1872                 daterawopt='-r'
1873         fi
1874         strftime_is_setup=1
1875 }
1876
1877 # $1 => strftime format string to use
1878 # $2 => raw timestamp as seconds since epoch
1879 # $3 => optional time zone string (empty/absent for local time zone)
1880 strftime()
1881 {
1882         setup_strftime
1883         if [ -n "$daterawopt" ]; then
1884                 if [ -n "$3" ]; then
1885                         TZ="$3" date "$daterawopt$2" "+$1"
1886                 else
1887                         date "$daterawopt$2" "+$1"
1888                 fi
1889         else
1890                 if [ -n "$3" ]; then
1891                         TZ="$3" perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1892                 else
1893                         perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1894                 fi
1895         fi
1896 }
1897
1898 got_cdup_result=
1899 git_cdup_result=
1900 v_get_show_cdup()
1901 {
1902         if [ -z "$got_cdup_result" ]; then
1903                 git_cdup_result="$(git rev-parse --show-cdup)"
1904                 got_cdup_result=1
1905         fi
1906         [ -z "$1" ] || eval "$1="'"$git_cdup_result"'
1907 }
1908
1909 setup_git_dir_is_bare()
1910 {
1911         if [ -z "$git_dir_is_bare_setup" ]; then
1912                 git_dir_is_bare="$(git rev-parse --is-bare-repository)"
1913                 [ z"$git_dir_is_bare" = z"true" ] || git_dir_is_bare=
1914                 git_dir_is_bare_setup=1
1915         fi
1916 }
1917
1918 setup_git_dirs()
1919 {
1920         [ -n "$git_dir" ] || git_dir="$(git rev-parse --git-dir)"
1921         if [ -n "$git_dir" ] && [ -d "$git_dir" ]; then
1922                 git_dir="$(cd "$git_dir" && pwd)"
1923         fi
1924         if [ -z "$git_common_dir" ]; then
1925                 if vcmp "$git_version" '>=' "2.5"; then
1926                         # rev-parse --git-common-dir is broken and may give
1927                         # an incorrect result unless the current directory is
1928                         # already set to the top level directory
1929                         v_get_show_cdup
1930                         git_common_dir="$(cd "./$git_cdup_result" && cd "$(git rev-parse --git-common-dir)" && pwd)"
1931                 else
1932                         git_common_dir="$git_dir"
1933                 fi
1934         fi
1935         [ -n "$git_dir" ] && [ -n "$git_common_dir" ] &&
1936         [ -d "$git_dir" ] && [ -d "$git_common_dir" ] || die "Not a git repository"
1937         git_hooks_dir="$git_common_dir/hooks"
1938         if vcmp "$git_version" '>=' "2.9" && gchp="$(git config --path --get core.hooksPath 2>/dev/null)" && [ -n "$gchp" ]; then
1939                 case "$gchp" in
1940                         /[!/]*)
1941                                 git_hooks_dir="$gchp"
1942                                 ;;
1943                         *)
1944                                 [ -n "$1" ] || warn "ignoring non-absolute core.hooksPath: $gchp"
1945                                 ;;
1946                 esac
1947                 unset_ gchp
1948         fi
1949 }
1950
1951 basic_setup_remote()
1952 {
1953         if [ -z "$base_remote" ]; then
1954                 if [ "${TG_EXPLICIT_REMOTE+set}" = "set" ]; then
1955                         base_remote="$TG_EXPLICIT_REMOTE"
1956                 else
1957                         base_remote="$(git config topgit.remote 2>/dev/null)" || :
1958                 fi
1959         fi
1960 }
1961
1962 basic_setup()
1963 {
1964         setup_git_dirs $1
1965         basic_setup_remote
1966         tgsequester="$(git config --bool topgit.sequester 2>/dev/null)" || :
1967         tgnosequester=
1968         [ "$tgsequester" != "false" ] || tgnosequester=1
1969         unset_ tgsequester
1970
1971         # catch errors if topbases is used without being set
1972         unset_ tg_topbases_set
1973         topbases="programmer*:error"
1974         topbasesrx="programmer*:error}"
1975         oldbases="$topbases"
1976 }
1977
1978 tmpdir_setup()
1979 {
1980         [ -z "$tg_tmp_dir" ] || return 0
1981         if [ -n "$TG_TMPDIR" ] && [ -d "$TG_TMPDIR" ] && [ -w "$TG_TMPDIR" ] &&
1982            { >"$TG_TMPDIR/.check"; } >/dev/null 2>&1; then
1983                 tg_tmp_dir="$TG_TMPDIR"
1984         else
1985                 tg_tmp_dir=
1986                 TRAPEXIT_='${TG_DEBUG:+echo} rm -rf "$tg_tmp_dir" >&2'
1987                 trap 'trapexit_ 129' HUP
1988                 trap 'trapexit_ 130' INT
1989                 trap 'trapexit_ 131' QUIT
1990                 trap 'trapexit_ 134' ABRT
1991                 trap 'trapexit_ 141' PIPE
1992                 trap 'trapexit_ 143' TERM
1993                 tg_tmp_dir="$(mktemp -d "$git_dir/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1994                 [ -n "$tg_tmp_dir" ] || tg_tmp_dir="$(mktemp -d "${TMPDIR:-/tmp}/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1995                 [ -n "$tg_tmp_dir" ] || [ -z "$TMPDIR" ] || tg_tmp_dir="$(mktemp -d "/tmp/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1996                 [ -z "$tg_tmp_dir" ] || tg_tmp_dir="$(cd "$tg_tmp_dir" && pwd -P)"
1997         fi
1998         [ -n "$tg_tmp_dir" ] && [ -w "$tg_tmp_dir" ] && { >"$tg_tmp_dir/.check"; } >/dev/null 2>&1 ||
1999                 die "could not create a writable temporary directory"
2000
2001         # whenever tg_tmp_dir is != "" these must always be set
2002         tg_ref_cache="$tg_tmp_dir/tg~ref-cache"
2003         tg_ref_cache_br="$tg_ref_cache.br"
2004         tg_ref_cache_rbr="$tg_ref_cache.rbr"
2005         tg_ref_cache_ann="$tg_ref_cache.ann"
2006         tg_ref_cache_dep="$tg_ref_cache.dep"
2007 }
2008
2009 cachedir_setup()
2010 {
2011         [ -z "$tg_cache_dir" ] || return 0
2012         user_id_no="$(id -u)" || :
2013         : "${user_id_no:=_99_}"
2014         tg_cache_dir="$git_common_dir/tg-cache"
2015         [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
2016         [ -z "$tg_cache_dir" ] || tg_cache_dir="$tg_cache_dir/$user_id_no"
2017         [ -z "$tg_cache_dir" ] || [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
2018         [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
2019         if [ -z "$tg_cache_dir" ]; then
2020                 tg_cache_dir="$tg_tmp_dir/tg-cache"
2021                 [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
2022                 [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
2023         fi
2024         [ -n "$tg_cache_dir" ] ||
2025                 die "could not create a writable tg-cache directory (even a temporary one)"
2026
2027         if [ -n "$2" ]; then
2028                 # allow the wayback machine to share a separate cache
2029                 [ -d "$tg_cache_dir/wayback" ] || mkdir "$tg_cache_dir/wayback" >/dev/null 2>&1 || :
2030                 ! [ -d "$tg_cache_dir/wayback" ] || ! { >"$tg_cache_dir/wayback/.tgcache"; } >/dev/null 2>&1 ||
2031                 tg_cache_dir="$tg_cache_dir/wayback"
2032         fi
2033 }
2034
2035 # set up alternate deb dirs
2036 altodb_setup()
2037 {
2038         # GIT_ALTERNATE_OBJECT_DIRECTORIES can contain double-quoted entries
2039         # since Git v2.11.1; however, it's only necessary for : (or perhaps ;)
2040         # so we avoid it if possible and require v2.11.1 to do it at all
2041         # otherwise just don't make an alternates temporary store in that case;
2042         # it's okay to not have one; everything will still work; the nicety of
2043         # making the temporary tree objects vanish when tg exits just won't
2044         # happen in that case but nothing will break also be sure to reuse
2045         # the parent's if we've been recursively invoked and it's for the
2046         # same repository we were invoked on
2047
2048         tg_use_alt_odb=1
2049         _fullodbdir=
2050         _odbdir="${GIT_OBJECT_DIRECTORY:-$git_common_dir/objects}"
2051         [ -n "$_odbdir" ] && [ -d "$_odbdir" ] && _fullodbdir="$(cd "$_odbdir" && pwd -P)" ||
2052                 die "could not find objects directory"
2053         if [ -n "$TG_OBJECT_DIRECTORY" ] && [ -d "$TG_OBJECT_DIRECTORY/info" ] &&
2054            [ -f "$TG_OBJECT_DIRECTORY/info/alternates" ] && [ -r "$TG_OBJECT_DIRECTORY/info/alternates" ]; then
2055                 if IFS= read -r _otherodbdir <"$TG_OBJECT_DIRECTORY/info/alternates" &&
2056                    [ -n "$_otherodbdir" ] && [ "$_otherodbdir" = "$_fullodbdir" ]; then
2057                         tg_use_alt_odb=2
2058                 fi
2059         fi
2060         _fulltmpdir="$(cd "$tg_tmp_dir" && pwd -P)"
2061         if [ "$tg_use_alt_odb" = "1" ]; then
2062                 # create an alternate objects database to keep the ephemeral objects in
2063                 mkdir -p "$tg_tmp_dir/objects/info"
2064                 TG_OBJECT_DIRECTORY="$_fulltmpdir/objects"
2065                 [ "$_fullodbdir" = "$TG_OBJECT_DIRECTORY" ] ||
2066                 echol "$_fullodbdir" >"$tg_tmp_dir/objects/info/alternates"
2067         fi
2068         case "$_fulltmpdir" in *[";:"]*|'"'*) vcmp "$git_version" '>=' "2.11.1" || tg_use_alt_odb=; esac
2069         if [ "$tg_use_alt_odb" = "1" ]; then
2070                 case "$TG_OBJECT_DIRECTORY" in
2071                         *[";:"]*|'"'*)
2072                                 # surround in "..." and backslash-escape internal '"' and '\\'
2073                                 _altodbdq="\"$(printf '%s\n' "$TG_OBJECT_DIRECTORY" |
2074                                         sed 's/\([""\\]\)/\\\1/g')\""
2075                                 ;;
2076                         *)
2077                                 _altodbdq="$TG_OBJECT_DIRECTORY"
2078                                 ;;
2079                 esac
2080                 TG_PRESERVED_ALTERNATES="$GIT_ALTERNATE_OBJECT_DIRECTORIES"
2081                 if [ -n "$GIT_ALTERNATE_OBJECT_DIRECTORIES" ]; then
2082                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq:$GIT_ALTERNATE_OBJECT_DIRECTORIES"
2083                 else
2084                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq"
2085                 fi
2086                 export TG_PRESERVED_ALTERNATES TG_OBJECT_DIRECTORY GIT_ALTERNATE_OBJECT_DIRECTORIES
2087                 if [ -n "$GIT_OBJECT_DIRECTORY" ]; then
2088                         export GIT_OBJECT_DIRECTORY
2089                 else
2090                         unset_ GIT_OBJECT_DIRECTORY
2091                 fi
2092         fi
2093 }
2094
2095 noalt_setup()
2096 {
2097         if [ "${TG_PRESERVED_ALTERNATES+set}" = "set" ]; then
2098                 GIT_ALTERNATE_OBJECT_DIRECTORIES="$TG_PRESERVED_ALTERNATES"
2099                 if [ -n "$GIT_ALTERNATE_OBJECT_DIRECTORIES" ]; then
2100                         export GIT_ALTERNATE_OBJECT_DIRECTORIES
2101                 else
2102                         unset_ GIT_ALTERNATE_OBJECT_DIRECTORIES
2103                 fi
2104         fi
2105         unset_ TG_TMPDIR TG_OBJECT_DIRECTORY TG_PRESERVED_ALTERNATES tg_use_alt_odb
2106 }
2107
2108 ## Initial setup
2109 initial_setup()
2110 {
2111         # suppress the merge log editor feature since git 1.7.10
2112
2113         GIT_MERGE_AUTOEDIT=no
2114         export GIT_MERGE_AUTOEDIT
2115
2116         basic_setup $1
2117         iowopt=
2118         ! vcmp "$git_version" '>=' "2.5" || iowopt="--ignore-other-worktrees"
2119         gcfbopt=
2120         ! vcmp "$git_version" '>=' "2.6" || gcfbopt="--buffer"
2121         auhopt=
2122         ! vcmp "$git_version" '>=' "2.9" || auhopt="--allow-unrelated-histories"
2123         v_get_show_cdup root_dir
2124         root_dir="${root_dir:-.}"
2125         logrefupdates="$(git config --bool core.logallrefupdates 2>/dev/null)" || :
2126         [ "$logrefupdates" = "true" ] || logrefupdates=
2127
2128         # make sure root_dir doesn't end with a trailing slash.
2129
2130         root_dir="${root_dir%/}"
2131
2132         # create global temporary and cache directories, usually inside GIT_DIR
2133
2134         tmpdir_setup
2135         unset_ TG_TMPDIR
2136         cachedir_setup
2137
2138         # the wayback machine directory serves as its own "altodb"
2139         [ -n "$wayback" ] || altodb_setup
2140 }
2141
2142 activate_wayback_machine()
2143 {
2144         [ -n "${1#:}" ] || [ -n "$2" ] || { wayback=; return 0; }
2145         setup_git_dirs
2146         tmpdir_setup
2147         altodb_setup
2148         tgwbr=
2149         tgwbr2=
2150         if [ -n "${1#:}" ]; then
2151                 tgwbr="$(get_temp wbinfo)"
2152                 tgwbr2="${tgwbr}2"
2153                 tg revert --list --no-short "${1#:}" >"$tgwbr" && test -s "$tgwbr" || return 1
2154                 # tg revert will likely leave a revert-tag-only cache which is not what we want
2155                 remove_ref_cache
2156         fi
2157         cachedir_setup "" 1 # use a separate wayback cache dir
2158         # but don't step on the normal one if the separate one could not be set up
2159         case "$tg_cache_dir" in */wayback);;*) tg_cache_dir=; esac
2160         altodb="$TG_OBJECT_DIRECTORY"
2161         if [ -n "$3" ] && [ -n "$2" ]; then
2162                 [ -d "$3" ] || { mkdir -p "$3" && [ -d "$3" ]; } ||
2163                         die "could not create wayback directory: $3"
2164                 tg_wayback_dir="$(cd "$3" && pwd -P)" || die "could not get wayback directory full path"
2165                 [ -d "$tg_wayback_dir/.git" ] || { mkdir -p "$tg_wayback_dir/.git" && [ -d "$tg_wayback_dir/.git" ]; } ||
2166                         die "could not initialize wayback directory: $3"
2167                 is_empty_dir "$tg_wayback_dir" ".git" && is_empty_dir "$tg_wayback_dir/.git" "." ||
2168                         die "wayback directory is not empty: $3"
2169                 mkdir "$tg_wayback_dir/.git/objects"
2170                 mkdir "$tg_wayback_dir/.git/objects/info"
2171                 cat "$altodb/info/alternates" >"$tg_wayback_dir/.git/objects/info/alternates"
2172         else
2173                 tg_wayback_dir="$tg_tmp_dir/wayback"
2174                 mkdir "$tg_wayback_dir"
2175                 mkdir "$tg_wayback_dir/.git"
2176                 ln -s "$altodb" "$tg_wayback_dir/.git/objects"
2177         fi
2178         mkdir "$tg_wayback_dir/.git/refs"
2179         printf '0 Wayback Machine' >"$tg_wayback_dir/.git/gc.pid"
2180         qpesc="$(printf '%s\n' "$git_common_dir" | sed -e 's/\([\\""]\)/\\\1/g' -e '$!s/$/\\n/' | tr -d '\n')"
2181         laru="false"
2182         [ -z "$2" ] || laru="true"
2183         printf '%s' "\
2184 [include]
2185         path = \"$qpesc/config\"
2186 [core]
2187         bare = false
2188         logAllRefUpdates = $laru
2189         repositoryFormatVersion = 0
2190 [extensions]
2191         preciousObjects = true
2192 [gc]
2193         auto = 0
2194         autoDetach = false
2195         autoPackLimit = 0
2196         packRefs = false
2197 [remote \"wayback\"]
2198         url = \"$qpesc\"
2199 [push]
2200         default = nothing
2201         followTags = true
2202 [alias]
2203         wayback-updates = fetch --force --no-tags --dry-run wayback refs/*:refs/*
2204 " >"$tg_wayback_dir/.git/config"
2205         cat "$git_dir/HEAD" >"$tg_wayback_dir/.git/HEAD"
2206         case "$1" in ":"?*);;*)
2207                 git show-ref >"$tg_wayback_dir/.git/packed-refs"
2208                 git --git-dir="$tg_wayback_dir/.git" pack-refs --all
2209         esac
2210         noalt_setup
2211         TG_OBJECT_DIRECTORY="$altodb" && export TG_OBJECT_DIRECTORY
2212         if [ -n "${1#:}" ]; then
2213                 <"$tgwbr" sed 's/^\([^ ][^ ]*\) \([^ ][^ ]*\)$/update \2 \1/' |
2214                 git --git-dir="$tg_wayback_dir/.git" update-ref -m "wayback to $1" ${2:+--create-reflog} --stdin
2215         fi
2216         if test -n "$2"; then
2217                 # extra setup for potential shell
2218                 qpesc2="$(printf '%s\n' "$git_common_dir" | sed -e 's/\([\\""]\)/\\\\\1/g' -e '$!s/$/\\n/' | tr -d '\n')"
2219                 printf '\twayback-repository = "!printf '\''%%s\\\\n'\'' \\"%s\\""\n' "$qpesc2" >>"$tg_wayback_dir/.git/config"
2220                 qtesc="$(printf '%s\n' "${1:-:}" | sed 's/\([""]\)/\\\1/g')"
2221                 printf '\twayback-tag = "!printf '\''%%s\\\\n'\'' \\"%s\\""\n' "$qtesc" >>"$tg_wayback_dir/.git/config"
2222                 if [ -d "$git_common_dir/rr-cache" ]; then
2223                         ln -s "$git_common_dir/rr-cache" "$tg_wayback_dir/.git/rr-cache"
2224                         printf "[rerere]\n\tenabled = true\n" >>"$tg_wayback_dir/.git/config"
2225                 fi
2226                 if [ z"$2" != z"2" ]; then
2227                         wbauth=
2228                         wbprnt=
2229                         if [ -n "${1#:}" ]; then
2230                                 [ -n "$tgwbr2" ] || tgwbr2="$(get_temp wbtag)"
2231                                 git --git-dir="$git_common_dir" cat-file tag "${1#:}" >"$tgwbr2" || return 1
2232                                 wbprnt="${lf}parent $(git --git-dir="$git_common_dir" rev-parse --verify --quiet "${1#:}"^0 -- 2>/dev/null)" || wbprnt=
2233                                 wbauth="$(<"$tgwbr2" awk '{if(!$0)exit;if($1=="tagger")print "author" substr($0,7)}')"
2234                         fi
2235                         wbcmtr="committer Wayback Machine <-> $(date "+%s %z")"
2236                         [ -n "$wbauth" ] || wbauth="author${wbcmtr#committer}"
2237                         wbtree="$(git --git-dir="$tg_wayback_dir/.git" mktree </dev/null)"
2238                         wbcmt="$({
2239                                 printf '%s\n' "tree $wbtree$wbprnt" "$wbauth" "$wbcmtr" ""
2240                                 if [ -n "$tgwbr2" ]; then
2241                                         <"$tgwbr2" sed -e '1,/^$/d' -e '/^-----BEGIN/,$d' | git stripspace
2242                                 else
2243                                         echo "Wayback Machine"
2244                                 fi
2245                         } | git --git-dir="$tg_wayback_dir/.git" hash-object -t commit -w --stdin)"
2246                         test -n "$wbcmt" || return 1
2247                         echo "$wbcmt" >"$tg_wayback_dir/.git/HEAD"
2248                 fi
2249         fi
2250         cd "$tg_wayback_dir"
2251         unset git_dir git_common_dir
2252 }
2253
2254 set_topbases()
2255 {
2256         # refer to "top-bases" in a refname with $topbases
2257
2258         [ -z "$tg_topbases_set" ] || return 0
2259
2260         topbases_implicit_default=1
2261         # See if topgit.top-bases is set to heads or refs
2262         tgtb="$(git config "topgit.top-bases" 2>/dev/null)" || :
2263         if [ -n "$tgtb" ] && [ "$tgtb" != "heads" ] && [ "$tgtb" != "refs" ]; then
2264                 if [ -n "$1" ]; then
2265                         # never die on the hook script
2266                         unset_ tgtb
2267                 else
2268                         die "invalid \"topgit.top-bases\" setting (must be \"heads\" or \"refs\")"
2269                 fi
2270         fi
2271         if [ -n "$tgtb" ]; then
2272                 case "$tgtb" in
2273                 heads)
2274                         topbases="heads/{top-bases}"
2275                         topbasesrx="heads/[{]top-bases[}]"
2276                         oldbases="top-bases";;
2277                 refs)
2278                         topbases="top-bases"
2279                         topbasesrx="top-bases"
2280                         oldbases="heads/{top-bases}";;
2281                 esac
2282                 # MUST NOT be exported
2283                 unset_ tgtb tg_topbases_set topbases_implicit_default
2284                 tg_topbases_set=1
2285                 return 0
2286         fi
2287         unset_ tgtb
2288
2289         # check heads and top-bases and see what state the current
2290         # repository is in.  remotes are ignored.
2291
2292         rc=0 activebases=
2293         activebases="$(
2294                 git for-each-ref --format='%(refname)' "refs/heads" "refs/top-bases" 2>/dev/null |
2295                 run_awk_ref_prefixes ${1:+-e} -n -- "refs/heads/{top-bases}" "refs/top-bases" "refs/heads")" ||
2296                 rc=$?
2297         if [ "$rc" = "65" ]; then
2298                 # Complain and die
2299                 err "repository contains existing TopGit branches"
2300                 err "but some use refs/top-bases/... for the base"
2301                 err "and some use refs/heads/{top-bases}/... for the base"
2302                 err "with the latter being the new, preferred location"
2303                 err "set \"topgit.top-bases\" to either \"heads\" to use"
2304                 err "the new heads/{top-bases} location or \"refs\" to use"
2305                 err "the old top-bases location."
2306                 err "(the tg migrate-bases command can also resolve this issue)"
2307                 die "schizophrenic repository requires topgit.top-bases setting"
2308         fi
2309         [ -z "$activebases" ] || unset_ topbases_implicit_default
2310         if [ "$activebases" = "refs/heads/{top-bases}" ]; then
2311                 topbases="heads/{top-bases}"
2312                 topbasesrx="heads/[{]top-bases[}]"
2313                 oldbases="top-bases"
2314         else
2315                 # default is still top-bases for now
2316                 topbases="top-bases"
2317                 topbasesrx="top-bases"
2318                 oldbases="heads/{top-bases}"
2319         fi
2320         # MUST NOT be exported
2321         unset_ rc activebases tg_topases_set
2322         tg_topbases_set=1
2323         return 0
2324 }
2325
2326 # $1 is remote name to check
2327 # $2 is optional variable name to set to result of check
2328 # $3 is optional command name to use in message (defaults to $cmd)
2329 # Fatal error if remote has schizophrenic top-bases
2330 # No error (and $2, if provided, will be set to empty) if remote has no top-bases at all
2331 check_remote_topbases()
2332 {
2333         [ -n "$1" ] || die "programmer error: check_remote_topbases called with no remote argument"
2334         _crrc=0 _crremotebases=
2335         _crremotebases="$(
2336                 git for-each-ref --format='%(refname)' "refs/remotes/$1" 2>/dev/null |
2337                 run_awk_ref_prefixes -n -- "refs/remotes/$1/{top-bases}" "refs/remotes/$1/top-bases" "refs/remotes/$1")" ||
2338                 _crrc=$?
2339         if [ "$_crrc" = "65" ]; then
2340                 err "remote \"$1\" has top-bases in both locations:"
2341                 err "  refs/remotes/$1/{top-bases}/..."
2342                 err "  refs/remotes/$1/top-bases/..."
2343                 err "set \"topgit.top-bases\" to \"heads\" for the first, preferred location"
2344                 err "or set \"topgit.top-bases\" to \"refs\" for the second, old location"
2345                 err "(the \"-c topgit.top-bases=<val>\" option can be used for this)"
2346                 err "then re-run the tg ${3:-$cmd} command"
2347                 err "(the tg migrate-bases command can also help with this problem)"
2348                 die "schizophrenic remote \"$1\" requires topgit.top-bases setting"
2349         fi
2350         [ "$_crrc" != "66" ] || _crremotebases= # just to be sure
2351         [ -z "$2" ] || eval "$2="'"$_crremotebases"'
2352         unset _crrc _crremotebases
2353         return 0
2354 }
2355
2356 # init_reflog "ref"
2357 # if "$logrefupdates" is set and ref is not under refs/heads/ then force
2358 # an empty log file to exist so that ref changes will be logged
2359 # "$1" must be a fully-qualified refname (i.e. start with "refs/")
2360 # However, if "$1" is "refs/tgstash" then always make the reflog
2361 # The only ref not under refs/ that Git will write a reflog for is HEAD;
2362 # no matter what, it will NOT update a reflog for any other bare refs so
2363 # just quietly succeed when passed TG_STASH without doing anything.
2364 init_reflog()
2365 {
2366         [ -n "$1" ] && [ "$1" != "TG_STASH" ] || return 0
2367         [ -n "$logrefupdates" ] || [ "$1" = "refs/tgstash" ] || return 0
2368         case "$1" in refs/heads/*|HEAD) return 0;; refs/*[!/]);; *) return 1; esac
2369         mkdir -p "$git_common_dir/logs/${1%/*}" 2>/dev/null || :
2370         { >>"$git_common_dir/logs/$1" || :; } 2>/dev/null
2371  }
2372
2373 # store the "realpath" for "$2" in "$1" except the leaf is not resolved if it's
2374 # a symbolic link.  The directory part must exist, but the basename need not.
2375 v_get_abs_path()
2376 {
2377         [ -n "$1" ] && [ -n "$2" ] || return 1
2378         set -- "$1" "$2" "${2%/}"
2379         case "$3" in
2380                 */*) set -- "$1" "$2" "${3%/*}";;
2381                 *  ) set -- "$1" "$2" ".";;
2382         esac
2383         case "$2" in */)
2384                 set -- "$1" "${2%/}" "$3" "/"
2385         esac
2386         [ -d "$3" ] || return 1
2387         eval "$1="'"$(cd "$3" && pwd -P)/${2##*/}$4"'
2388 }
2389
2390 ## Startup
2391
2392 : "${TG_INST_CMDDIR:=@cmddir@}"
2393 : "${TG_INST_SHAREDIR:=@sharedir@}"
2394 : "${TG_INST_HOOKSDIR:=@hooksdir@}"
2395
2396 [ -d "$TG_INST_CMDDIR" ] ||
2397         die "No command directory: '$TG_INST_CMDDIR'"
2398
2399 ## Include awk scripts and their utility functions (separated for easier debugging)
2400
2401 [ -f "$TG_INST_CMDDIR/tg--awksome" ] && [ -r "$TG_INST_CMDDIR/tg--awksome" ] ||
2402         die "Missing awk scripts: '$TG_INST_CMDDIR/tg--awksome'"
2403 . "$TG_INST_CMDDIR/tg--awksome"
2404
2405 if [ -n "$tg__include" ]; then
2406
2407         # We were sourced from another script for our utility functions;
2408         # this is set by hooks.  Skip the rest of the file.  A simple return doesn't
2409         # work as expected in every shell.  See http://bugs.debian.org/516188
2410
2411         # ensure setup happens
2412
2413         initial_setup 1
2414         set_topbases 1
2415         noalt_setup
2416
2417 else
2418
2419         set -e
2420
2421         tgbin="$0"
2422         tgdir="${tgbin%/}"
2423         case "$tgdir" in */*);;*) tgdir="./$tgdir"; esac
2424         tgdir="${tgdir%/*}/"
2425         tgname="${tgbin##*/}"
2426         [ "$0" != "$tgname" ] || tgdir=""
2427
2428         # If tg contains a '/' but does not start with one then replace it with an absolute path
2429
2430         case "$0" in /*) ;; */*)
2431                 tgdir="$(cd "${0%/*}" && pwd -P)/"
2432                 tgbin="$tgdir$tgname"
2433         esac
2434
2435         # tgdisplay will include any explicit -C <dir> etc. options whereas tgname will not
2436         # tgdisplayac is the same as tgdisplay but without any -r or -u options (ac => abort/continue)
2437
2438         tgdisplaydir="$tgdir"
2439         tgdisplay="$tgbin"
2440         tgdisplayac="$tgdisplay"
2441         if
2442             v_get_abs_path _tgnameabs "$(cmd_path "$tgname")" &&
2443             _tgabs="$_tgnameabs" &&
2444             { [ "$tgbin" = "$tgname" ] || v_get_abs_path _tgabs "$tgbin"; } &&
2445             [ "$_tgabs" = "$_tgnameabs" ]
2446         then
2447                 tgdisplaydir=""
2448                 tgdisplay="$tgname"
2449                 tgdisplayac="$tgdisplay"
2450         fi
2451         [ -z "$_tgabs" ] || tgbin="$_tgabs"
2452         unset_ _tgabs _tgnameabs
2453
2454         tg() (
2455                 TG_TMPDIR="$tg_tmp_dir" && export TG_TMPDIR &&
2456                 exec "$tgbin" "$@"
2457         )
2458
2459         explicit_remote=
2460         explicit_dir=
2461         gitcdopt=
2462         noremote=
2463         forcepager=
2464         wayback=
2465
2466         cmd=
2467         while :; do case "$1" in
2468
2469                 help|--help|-h)
2470                         cmd=help
2471                         shift
2472                         break;;
2473
2474                 status|--status)
2475                         cmd=status
2476                         shift
2477                         break;;
2478
2479                 --hooks-path)
2480                         cmd=hooks-path
2481                         shift
2482                         break;;
2483
2484                 --exec-path)
2485                         cmd=exec-path
2486                         shift
2487                         break;;
2488
2489                 --awk-path)
2490                         cmd=awk-path
2491                         shift
2492                         break;;
2493
2494                 --top-bases)
2495                         cmd=top-bases
2496                         shift
2497                         break;;
2498
2499                 --no-pager)
2500                         forcepager=0
2501                         shift;;
2502
2503                 --pager|-p)
2504                         forcepager=1
2505                         shift;;
2506
2507                 -r)
2508                         shift
2509                         if [ -z "$1" ]; then
2510                                 echo "Option -r requires an argument." >&2
2511                                 do_help
2512                                 exit 1
2513                         fi
2514                         unset_ noremote
2515                         base_remote="$1"
2516                         explicit_remote="$base_remote"
2517                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -r $explicit_remote"
2518                         TG_EXPLICIT_REMOTE="$base_remote" && export TG_EXPLICIT_REMOTE
2519                         shift;;
2520
2521                 -u)
2522                         unset_ base_remote explicit_remote
2523                         noremote=1
2524                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -u"
2525                         TG_EXPLICIT_REMOTE= && export TG_EXPLICIT_REMOTE
2526                         shift;;
2527
2528                 -C)
2529                         shift
2530                         if [ -z "$1" ]; then
2531                                 echo "Option -C requires an argument." >&2
2532                                 do_help
2533                                 exit 1
2534                         fi
2535                         cd "$1"
2536                         unset_ GIT_DIR GIT_COMMON_DIR
2537                         if [ -z "$explicit_dir" ]; then
2538                                 explicit_dir="$1"
2539                         else
2540                                 explicit_dir="$PWD"
2541                         fi
2542                         gitcdopt=" -C \"$explicit_dir\""
2543                         [ "$explicit_dir" != "." ] || explicit_dir="." gitcdopt=" -C ."
2544                         tgdisplay="$tgdisplaydir$tgname$gitcdopt"
2545                         tgdisplayac="$tgdisplay"
2546                         [ -z "$explicit_remote" ] || tgdisplay="$tgdisplay -r $explicit_remote"
2547                         [ -z "$noremote" ] || tgdisplay="$tgdisplay -u"
2548                         shift;;
2549
2550                 -c)
2551                         shift
2552                         if [ -z "$1" ]; then
2553                                 echo "Option -c requires an argument." >&2
2554                                 do_help
2555                                 exit 1
2556                         fi
2557                         param="'$(printf '%s\n' "$1" | sed "s/[']/'\\\\''/g")'"
2558                         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }$param"
2559                         export GIT_CONFIG_PARAMETERS
2560                         shift;;
2561
2562                 -w)
2563                         if [ -n "$wayback" ]; then
2564                                 echo "Option -w may be used at most once." >&2
2565                                 do_help
2566                                 exit 1
2567                         fi
2568                         shift
2569                         if [ -z "$1" ]; then
2570                                 echo "Option -w requires an argument." >&2
2571                                 do_help
2572                                 exit 1
2573                         fi
2574                         wayback="$1"
2575                         shift;;
2576
2577                 --)
2578                         shift
2579                         break;;
2580
2581                 -*)
2582                         echo "Invalid option $1 (subcommand options must appear AFTER the subcommand)." >&2
2583                         do_help
2584                         exit 1;;
2585
2586                 *)
2587                         break;;
2588
2589         esac; done
2590         if [ z"$forcepager" = z"0" ]; then
2591                 GIT_PAGER_IN_USE=1 TG_PAGER_IN_USE=1 &&
2592                 export GIT_PAGER_IN_USE TG_PAGER_IN_USE
2593         fi
2594
2595         [ -n "$cmd" -o $# -lt 1 ] || { cmd="$1"; shift; }
2596
2597         ## Dispatch
2598
2599         [ -n "$cmd" ] || { do_help; exit 1; }
2600
2601         case "$cmd" in
2602
2603                 help)
2604                         do_help "$@"
2605                         exit 0;;
2606
2607                 status|st)
2608                         unset_ base_remote
2609                         basic_setup
2610                         set_topbases
2611                         do_status "$@"
2612                         exit ${do_status_result:-0};;
2613
2614                 hooks-path)
2615                         # Internal command
2616                         echol "$TG_INST_HOOKSDIR";;
2617
2618                 exec-path)
2619                         # Internal command
2620                         echol "$TG_INST_CMDDIR";;
2621
2622                 awk-path)
2623                         # Internal command
2624                         echol "$TG_INST_CMDDIR/awk";;
2625
2626                 top-bases)
2627                         # Maintenance command
2628                         do_topbases_help=
2629                         show_remote_topbases=
2630                         case "$1" in
2631                                 --help|-h)
2632                                         do_topbases_help=0;;
2633                                 -r|--remote)
2634                                         if [ $# -eq 2 ] && [ -n "$2" ]; then
2635                                                 # unadvertised, but make it work
2636                                                 base_remote="$2"
2637                                                 shift
2638                                         fi
2639                                         show_remote_topbases=1;;
2640                                 *)
2641                                         [ $# -eq 0 ] || do_topbases_help=1;;
2642                         esac
2643                         [ $# -le 1 ] || do_topbases_help=1
2644                         if [ -n "$do_topbases_help" ]; then
2645                                 helpcmd='echo "Usage: ${tgname:-tg} [-r <remote>] --top-bases [-r]"'
2646                                 [ $do_topbases_help -eq 0 ] || helpcmd="$helpcmd >&2"
2647                                 eval "$helpcmd"
2648                                 exit $do_topbases_help
2649                         fi
2650                         git_dir=
2651                         if git_dir="$(git rev-parse --git-dir 2>&1)"; then
2652                                 [ -z "$wayback" ] || activate_wayback_machine "$wayback"
2653                                 setup_git_dirs
2654                         fi
2655                         set_topbases
2656                         if [ -n "$show_remote_topbases" ]; then
2657                                 basic_setup_remote
2658                                 [ -n "$base_remote" ] ||
2659                                 die "no remote location given. Either use -r <remote> option or set topgit.remote"
2660                                 rbases=
2661                                 [ -z "$topbases_implicit_default" ] ||
2662                                 check_remote_topbases "$base_remote" rbases "--top-bases"
2663                                 if [ -n "$rbases" ]; then
2664                                         echol "$rbases"
2665                                 else
2666                                         echol "refs/remotes/$base_remote/${topbases#heads/}"
2667                                 fi
2668                         else
2669                                 echol "refs/$topbases"
2670                         fi;;
2671
2672                 *)
2673                         isutil=
2674                         case "$cmd" in index-merge-one-file)
2675                                 isutil="-"
2676                         esac
2677                         [ -r "$TG_INST_CMDDIR"/tg-$isutil$cmd ] || {
2678                                 looplevel="$TG_ALIAS_DEPTH"
2679                                 [ "${looplevel#[1-9]}" != "$looplevel" ] &&
2680                                 [ "${looplevel%%[!0-9]*}" = "$looplevel" ] ||
2681                                 looplevel=0
2682                                 tgalias="$(git config "topgit.alias.$cmd" 2>/dev/null)" || :
2683                                 [ -n "$tgalias" ] || {
2684                                         echo "Unknown subcommand: $cmd" >&2
2685                                         do_help
2686                                         exit 1
2687                                 }
2688                                 looplevel=$(( $looplevel + 1 ))
2689                                 [ $looplevel -le 10 ] || die "topgit.alias nesting level 10 exceeded"
2690                                 TG_ALIAS_DEPTH="$looplevel"
2691                                 export TG_ALIAS_DEPTH
2692                                 if [ "!${tgalias#?}" = "$tgalias" ]; then
2693                                         [ -z "$wayback" ] ||
2694                                         die "-w is not allowed before an '!' alias command"
2695                                         unset_ GIT_PREFIX
2696                                         if pfx="$(git rev-parse --show-prefix 2>/dev/null)"; then
2697                                                 GIT_PREFIX="$pfx"
2698                                                 export GIT_PREFIX
2699                                         fi
2700                                         cd "./$(git rev-parse --show-cdup 2>/dev/null)"
2701                                         exec @SHELL_PATH@ -c "${tgalias#?} \"\$@\"" @SHELL_PATH@ "$@"
2702                                 else
2703                                         eval 'exec "$tgbin"' "${wayback:+-w \"\$wayback\"}" "$tgalias" '"$@"'
2704                                 fi
2705                                 die "alias execution failed for: $tgalias"
2706                         }
2707                         unset_ TG_ALIAS_DEPTH
2708
2709                         showing_help=
2710                         if [ "$*" = "-h" ] || [ "$*" = "--help" ]; then
2711                                 showing_help=1
2712                         fi
2713
2714                         nomergesetup="$showing_help"
2715                         case "$cmd" in base|contains|export|files|info|log|mail|next|patch|prev|rebase|revert|shell|summary|tag)
2716                                 # avoid merge setup where not necessary
2717
2718                                 nomergesetup=1
2719                         esac
2720
2721                         if [ -n "$wayback" ] && [ -z "$showing_help" ]; then
2722                                 [ -n "$nomergesetup" ] ||
2723                                 die "the wayback machine cannot be used with the \"$cmd\" subcommand"
2724                                 if [ "$cmd" = "shell" ]; then
2725                                         # this is ugly; `tg shell` should handle this but it's too
2726                                         # late there so we have to do it here
2727                                         wayback_dir=
2728                                         case "$1" in
2729                                                 "--directory="?*)
2730                                                         wayback_dir="${1#--directory=}" && shift;;
2731                                                 "--directory=")
2732                                                         die "--directory requires an argument";;
2733                                                 "--directory")
2734                                                         [ $# -ge 2 ] || die "--directory requires an argument"
2735                                                         wayback_dir="$2" && shift 2;;
2736                                         esac
2737                                         activate_wayback_machine "$wayback" 1 "$wayback_dir"
2738                                 else
2739                                         _fullwb=
2740                                         # export might drop out into a shell for conflict resolution
2741                                         [ "$cmd" != "export" ] || _fullwb=2
2742                                         activate_wayback_machine "$wayback" "$_fullwb"
2743                                 fi ||
2744                                 die "failed to set the wayback machine to target \"$wayback\""
2745                         fi
2746
2747                         [ -n "$showing_help" ] || initial_setup
2748                         [ -z "$noremote" ] || unset_ base_remote
2749
2750                         if [ -z "$nomergesetup" ]; then
2751                                 # make sure merging the .top* files will always behave sanely
2752
2753                                 setup_ours
2754                                 setup_hook "pre-commit"
2755                         fi
2756
2757                         # everything but rebase needs topbases set
2758                         carefully="$showing_help"
2759                         [ "$cmd" != "migrate-bases" ] || carefully=1
2760                         [ "$cmd" = "rebase" ] || set_topbases $carefully
2761
2762                         _use_ref_cache=
2763                         tg_read_only=1
2764                         _suppress_alt=
2765                         case "$cmd$showing_help" in
2766                                 contains|info|summary|tag)
2767                                         _use_ref_cache=1;;
2768                                 "export")
2769                                         _use_ref_cache=1
2770                                         _suppress_alt=1;;
2771                                 annihilate|create|delete|depend|import|update)
2772                                         tg_read_only=
2773                                         _suppress_alt=1;;
2774                         esac
2775                         [ -z "$_suppress_alt" ] || noalt_setup
2776                         [ -z "$_use_ref_cache" ] || v_create_ref_cache
2777
2778                         fullcmd="${tgname:-tg} $cmd $*"
2779                         if [ z"$forcepager" = z"1" ]; then
2780                                 page '. "$TG_INST_CMDDIR"/tg-$isutil$cmd' "$@"
2781                         else
2782                                 . "$TG_INST_CMDDIR"/tg-$isutil$cmd
2783                         fi;;
2784         esac
2785
2786 fi