tg.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # Copyright (C) Petr Baudis <pasky@suse.cz>  2008
   4 # Copyright (C) Kyle J. McKay <mackyle@gmail.com>  2014,2015,2016
   5 # All rights reserved.
   6 # GPLv2
   7
   8 TG_VERSION=0.19.7
   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"
  20 mtblob="e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
  21 tab='   '
  22 lf='
  23 '
  24
  25 ## Auxiliary functions
  26
  27 # Preserves current $? value while triggering a non-zero set -e exit if active
  28 # This works even for shells that sometimes fail to correctly trigger a -e exit
  29 check_exit_code()
  30 {
  31         return $?
  32 }
  33
  34 # This is the POSIX equivalent of which
  35 cmd_path()
  36 (
  37         { "unset" -f command unset unalias "$1"; } >/dev/null 2>&1 || :
  38         { "unalias" -a; } >/dev/null 2>&1 || :
  39         command -v "$1"
  40 )
  41
  42 # helper for wrappers
  43 # note deliberate use of '(' ... ')' rather than '{' ... '}'
  44 exec_lc_all_c()
  45 (
  46         LC_ALL="C" &&
  47         export LC_ALL &&
  48         exec "$@"
  49 )
  50
  51 # These tools work better for us with LC_ALL=C and by using these little
  52 # convenience functions LC_ALL=C does not have to appear in the code but
  53 # any Git translations will still appear for Git commands
  54 awk()   { exec_lc_all_c @AWK_PATH@      "$@"; }
  55 cat()   { exec_lc_all_c cat             "$@"; }
  56 cut()   { exec_lc_all_c cut             "$@"; }
  57 find()  { exec_lc_all_c find            "$@"; }
  58 grep()  { exec_lc_all_c grep            "$@"; }
  59 join()  { exec_lc_all_c join            "$@"; }
  60 paste() { exec_lc_all_c paste           "$@"; }
  61 sed()   { exec_lc_all_c sed             "$@"; }
  62 sort()  { exec_lc_all_c sort            "$@"; }
  63 tr()    { exec_lc_all_c tr              "$@"; }
  64 wc()    { exec_lc_all_c wc              "$@"; }
  65 xargs() { exec_lc_all_c xargs           "$@"; }
  66
  67 # Output arguments without any possible interpretation
  68 # (Avoid misinterpretation of '\' characters or leading "-n", "-E" or "-e")
  69 echol()
  70 {
  71         printf '%s\n' "$*"
  72 }
  73
  74 info()
  75 {
  76         echol "${TG_RECURSIVE}${tgname:-tg}: $*"
  77 }
  78
  79 warn()
  80 {
  81         info "warning: $*" >&2
  82 }
  83
  84 err()
  85 {
  86         info "error: $*" >&2
  87 }
  88
  89 die()
  90 {
  91         info "fatal: $*" >&2
  92         exit 1
  93 }
  94
  95 # shift off first arg then return "$*" properly quoted in single-quotes
  96 # if $1 was '' output goes to stdout otherwise it's assigned to $1
  97 # the final \n, if any, is omitted from the result but any others are included
  98 v_quotearg()
  99 {
 100         _quotearg_v="$1"
 101         shift
 102         set -- "$_quotearg_v" \
 103         "sed \"s/'/'\\\\\\''/g;1s/^/'/;\\\$s/\\\$/'/;s/'''/'/g;1s/^''\\(.\\)/\\1/\"" "$*"
 104         unset _quotearg_v
 105         if [ -z "$3" ]; then
 106                 if [ -z "$1" ]; then
 107                         echo "''"
 108                 else
 109                         eval "$1=\"''\""
 110                 fi
 111         else
 112                 if [ -z "$1" ]; then
 113                         printf "%s$4" "$3" | eval "$2"
 114                 else
 115                         eval "$1="'"$(printf "%s$4" "$3" | eval "$2")"'
 116                 fi
 117         fi
 118 }
 119
 120 # same as v_quotearg except there's no extra $1 so output always goes to stdout
 121 quotearg()
 122 {
 123         v_quotearg '' "$@"
 124 }
 125
 126 vcmp()
 127 {
 128         # Compare $1 to $3 each of which must match ^[^0-9]*\d*(\.\d*)*.*$
 129         # where only the "\d*" parts in the regex participate in the comparison
 130         # Since EVERY string matches that regex this function is easy to use
 131         # An empty string ('') for $1 or $3 or any "\d*" part is treated as 0
 132         # $2 is a compare op '<', '<=', '=', '==', '!=', '>=', '>'
 133         # Return code is 0 for true, 1 for false (or unknown compare op)
 134         # There is NO difference in behavior between '=' and '=='
 135         # Note that "vcmp 1.8 == 1.8.0.0.0.0" correctly returns 0
 136         set -- "$1" "$2" "$3" "${1%%[0-9]*}" "${3%%[0-9]*}"
 137         set -- "${1#"$4"}" "$2" "${3#"$5"}"
 138         set -- "${1%%[!0-9.]*}" "$2" "${3%%[!0-9.]*}"
 139         while
 140                 vcmp_a_="${1%%.*}"
 141                 vcmp_b_="${3%%.*}"
 142                 [ "z$vcmp_a_" != "z" -o "z$vcmp_b_" != "z" ]
 143         do
 144                 if [ "${vcmp_a_:-0}" -lt "${vcmp_b_:-0}" ]; then
 145                         unset vcmp_a_ vcmp_b_
 146                         case "$2" in "<"|"<="|"!=") return 0; esac
 147                         return 1
 148                 elif [ "${vcmp_a_:-0}" -gt "${vcmp_b_:-0}" ]; then
 149                         unset vcmp_a_ vcmp_b_
 150                         case "$2" in ">"|">="|"!=") return 0; esac
 151                         return 1;
 152                 fi
 153                 vcmp_a_="${1#$vcmp_a_}"
 154                 vcmp_b_="${3#$vcmp_b_}"
 155                 set -- "${vcmp_a_#.}" "$2" "${vcmp_b_#.}"
 156         done
 157         unset vcmp_a_ vcmp_b_
 158         case "$2" in "="|"=="|"<="|">=") return 0; esac
 159         return 1
 160 }
 161
 162 precheck() {
 163         if ! git_version="$(git version)"; then
 164                 die "'git version' failed"
 165         fi
 166         case "$git_version" in [Gg]"it version "*);;*)
 167                 die "'git version' output does not start with 'git version '"
 168         esac
 169
 170         vcmp "$git_version" '>=' "$GIT_MINIMUM_VERSION" ||
 171                 die "git version >= $GIT_MINIMUM_VERSION required but found $git_version instead"
 172 }
 173
 174 case "$1" in version|--version|-V)
 175         echo "TopGit version $TG_VERSION"
 176         exit 0
 177 esac
 178
 179 precheck
 180 [ "$1" = "precheck" ] && exit 0
 181
 182
 183 cat_depsmsg_internal()
 184 {
 185         _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
 186         if [ -s "$tg_cache_dir/refs/heads/$1/.$2" ]; then
 187                 if read _rev_match && [ "$_rev" = "$_rev_match" ]; then
 188                         _line=
 189                         while IFS= read -r _line || [ -n "$_line" ]; do
 190                                 printf '%s\n' "$_line"
 191                         done
 192                         return 0
 193                 fi <"$tg_cache_dir/refs/heads/$1/.$2"
 194         fi
 195         [ -d "$tg_cache_dir/refs/heads/$1" ] || mkdir -p "$tg_cache_dir/refs/heads/$1" 2>/dev/null || :
 196         if [ -d "$tg_cache_dir/refs/heads/$1" ]; then
 197                 printf '%s\n' "$_rev" >"$tg_cache_dir/refs/heads/$1/.$2"
 198                 _line=
 199                 git cat-file blob "$_rev:.$2" 2>/dev/null |
 200                 while IFS= read -r _line || [ -n "$_line" ]; do
 201                         printf '%s\n' "$_line" >&3
 202                         printf '%s\n' "$_line"
 203                 done 3>>"$tg_cache_dir/refs/heads/$1/.$2"
 204         else
 205                 git cat-file blob "$_rev:.$2" 2>/dev/null
 206         fi
 207 }
 208
 209 # cat_deps BRANCHNAME
 210 # Caches result
 211 cat_deps()
 212 {
 213         cat_depsmsg_internal "$1" topdeps
 214 }
 215
 216 # cat_msg BRANCHNAME
 217 # Caches result
 218 cat_msg()
 219 {
 220         cat_depsmsg_internal "$1" topmsg
 221 }
 222
 223 # cat_file TOPIC:PATH [FROM]
 224 # cat the file PATH from branch TOPIC when FROM is empty.
 225 # FROM can be -i or -w, than the file will be from the index or worktree,
 226 # respectively. The caller should than ensure that HEAD is TOPIC, to make sense.
 227 cat_file()
 228 {
 229         path="$1"
 230         case "$2" in
 231         -w)
 232                 cat "$root_dir/${path#*:}"
 233                 ;;
 234         -i)
 235                 # ':file' means cat from index
 236                 git cat-file blob ":${path#*:}" 2>/dev/null
 237                 ;;
 238         '')
 239                 case "$path" in
 240                 refs/heads/*:.topdeps)
 241                         _temp="${path%:.topdeps}"
 242                         cat_deps "${_temp#refs/heads/}"
 243                         ;;
 244                 refs/heads/*:.topmsg)
 245                         _temp="${path%:.topmsg}"
 246                         cat_msg "${_temp#refs/heads/}"
 247                         ;;
 248                 *)
 249                         git cat-file blob "$path" 2>/dev/null
 250                         ;;
 251                 esac
 252                 ;;
 253         *)
 254                 die "Wrong argument to cat_file: '$2'"
 255                 ;;
 256         esac
 257 }
 258
 259 # if use_alt_temp_odb and tg_use_alt_odb are true try to write the object(s)
 260 # into the temporary alt odb area instead of the usual location
 261 git_temp_alt_odb_cmd()
 262 {
 263         if [ -n "$use_alt_temp_odb" ] && [ -n "$tg_use_alt_odb" ] &&
 264            [ -n "$TG_OBJECT_DIRECTORY" ] &&
 265            [ -f "$TG_OBJECT_DIRECTORY/info/alternates" ]; then
 266                 (
 267                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$TG_PRESERVED_ALTERNATES"
 268                         GIT_OBJECT_DIRECTORY="$TG_OBJECT_DIRECTORY"
 269                         unset TG_OBJECT_DIRECTORY TG_PRESERVED_ALTERNATES
 270                         export GIT_ALTERNATE_OBJECT_DIRECTORIES GIT_OBJECT_DIRECTORY
 271                         git "$@"
 272                 )
 273         else
 274                 git "$@"
 275         fi
 276 }
 277
 278 git_write_tree() { git_temp_alt_odb_cmd write-tree "$@"; }
 279 git_mktree() { git_temp_alt_odb_cmd mktree "$@"; }
 280
 281 # get tree for the committed topic
 282 get_tree_()
 283 {
 284         echo "refs/heads/$1"
 285 }
 286
 287 # get tree for the base
 288 get_tree_b()
 289 {
 290         echo "refs/$topbases/$1"
 291 }
 292
 293 # get tree for the index
 294 get_tree_i()
 295 {
 296         git_write_tree
 297 }
 298
 299 # get tree for the worktree
 300 get_tree_w()
 301 {
 302         i_tree=$(git_write_tree)
 303         (
 304                 # the file for --index-output needs to sit next to the
 305                 # current index file
 306                 cd "$root_dir"
 307                 : ${GIT_INDEX_FILE:="$git_dir/index"}
 308                 TMP_INDEX="$(mktemp "${GIT_INDEX_FILE}-tg.XXXXXX")"
 309                 git read-tree -m $i_tree --index-output="$TMP_INDEX" &&
 310                 GIT_INDEX_FILE="$TMP_INDEX" &&
 311                 export GIT_INDEX_FILE &&
 312                 git diff --name-only -z HEAD |
 313                         git update-index -z --add --remove --stdin &&
 314                 git_write_tree &&
 315                 rm -f "$TMP_INDEX"
 316         )
 317 }
 318
 319 # get tree for arbitrary ref
 320 get_tree_r()
 321 {
 322         echo "$1"
 323 }
 324
 325 # strip_ref "$(git symbolic-ref HEAD)"
 326 # Output will have a leading refs/heads/ or refs/$topbases/ stripped if present
 327 strip_ref()
 328 {
 329         case "$1" in
 330                 refs/"$topbases"/*)
 331                         echol "${1#refs/$topbases/}"
 332                         ;;
 333                 refs/heads/*)
 334                         echol "${1#refs/heads/}"
 335                         ;;
 336                 *)
 337                         echol "$1"
 338         esac
 339 }
 340
 341 # pretty_tree [-t] NAME [-b | -i | -w | -r]
 342 # Output tree ID of a cleaned-up tree without tg's artifacts.
 343 # NAME will be ignored for -i and -w, but needs to be present
 344 # With -r NAME must be a full ref name to a treeish (it's used as-is)
 345 # If -t is used the tree is written into the alternate temporary objects area
 346 pretty_tree()
 347 {
 348         use_alt_temp_odb=
 349         [ "$1" != "-t" ] || { shift; use_alt_temp_odb=1; }
 350         name="$1"
 351         source="${2#?}"
 352         git ls-tree --full-tree "$(get_tree_$source "$name")" |
 353                 sed -ne '/      \.top.*$/!p' |
 354                 git_mktree
 355 }
 356
 357 # return an empty-tree root commit -- date is either passed in or current
 358 # If passed in "$*" must be epochsecs followed by optional hhmm offset (+0000 default)
 359 # An invalid secs causes the current date to be used, an invalid zone offset
 360 # causes +0000 to be used
 361 make_empty_commit()
 362 (
 363         # the empty tree is guaranteed to always be there even in a repo with
 364         # zero objects, but for completeness we force it to exist as a real object
 365         SECS=
 366         read -r SECS ZONE JUNK <<-EOT || :
 367                 $*
 368                 EOT
 369         case "$SECS" in *[!0-9]*) SECS=; esac
 370         if [ -z "$SECS" ]; then
 371                 MTDATE="$(date '+%s %z')"
 372         else
 373                 case "$ZONE" in
 374                         -[01][0-9][0-5][0-9]|+[01][0-9][0-5][0-9])
 375                                 ;;
 376                         [01][0-9][0-5][0-9])
 377                                 ZONE="+$ZONE"
 378                                 ;;
 379                         *)
 380                                 ZONE="+0000"
 381                 esac
 382                 MTDATE="$SECS $ZONE"
 383         fi
 384         EMPTYID="- <-> $MTDATE"
 385         EMPTYTREE="$(git hash-object -t tree -w --stdin < /dev/null)"
 386         printf '%s\n' "tree $EMPTYTREE" "author $EMPTYID" "committer $EMPTYID" '' |
 387         git hash-object -t commit -w --stdin
 388 )
 389
 390 # standard input is a diff
 391 # standard output is the "+" lines with leading "+ " removed
 392 diff_added_lines()
 393 {
 394         awk '
 395 BEGIN      { in_hunk = 0; }
 396 /^@@ /     { in_hunk = 1; }
 397 /^\+/      { if (in_hunk == 1) printf("%s\n", substr($0, 2)); }
 398 /^[^@ +-]/ { in_hunk = 0; }
 399 '
 400 }
 401
 402 # $1 is name of new branch to create locally if all of these are true:
 403 #   a) exists as a remote TopGit branch for "$base_remote"
 404 #   b) the branch "name" does not have any invalid characters in it
 405 #   c) neither of the two branch refs (branch or base) exist locally
 406 # returns success only if a new local branch was created (and dumps message)
 407 auto_create_local_remote()
 408 {
 409         case "$1" in ""|*[" $tab$lf~^:\\*?["]*|.*|*/.*|*.|*./|/*|*/|*//*) return 1; esac
 410         [ -n "$base_remote" ] &&
 411         git update-ref --stdin <<-EOT >/dev/null 2>&1 &&
 412                 verify refs/remotes/$base_remote/${topbases#heads/}/$1 refs/remotes/$base_remote/${topbases#heads/}/$1
 413                 verify refs/remotes/$base_remote/$1 refs/remotes/$base_remote/$1
 414                 create refs/$topbases/$1 refs/remotes/$base_remote/${topbases#heads/}/$1^0
 415                 create refs/heads/$1 refs/remotes/$base_remote/$1^0
 416         EOT
 417         { init_reflog "refs/$topbases/$1" || :; } &&
 418         info "topic branch '$1' automatically set up from remote '$base_remote'"
 419 }
 420
 421 # setup_hook NAME
 422 setup_hook()
 423 {
 424         tgname="${0##*/}"
 425         hook_call="\"\$(\"$tgname\" --hooks-path)\"/$1 \"\$@\""
 426         if [ -f "$git_hooks_dir/$1" ] && grep -Fq "$hook_call" "$git_hooks_dir/$1"; then
 427                 # Another job well done!
 428                 return
 429         fi
 430         # Prepare incantation
 431         hook_chain=
 432         if [ -s "$git_hooks_dir/$1" -a -x "$git_hooks_dir/$1" ]; then
 433                 hook_call="$hook_call"' || exit $?'
 434                 if [ -L "$git_hooks_dir/$1" ] || ! sed -n 1p <"$git_hooks_dir/$1" | grep -Fqx "#!@SHELL_PATH@"; then
 435                         chain_num=
 436                         while [ -e "$git_hooks_dir/$1-chain$chain_num" ]; do
 437                                 chain_num=$(( $chain_num + 1 ))
 438                         done
 439                         mv -f "$git_hooks_dir/$1" "$git_hooks_dir/$1-chain$chain_num"
 440                         hook_chain=1
 441                 fi
 442         else
 443                 hook_call="exec $hook_call"
 444                 [ -d "$git_hooks_dir" ] || mkdir -p "$git_hooks_dir" || :
 445         fi
 446         # Don't call hook if tg is not installed
 447         hook_call="if command -v \"$tgname\" >/dev/null 2>&1; then $hook_call; fi"
 448         # Insert call into the hook
 449         {
 450                 echol "#!@SHELL_PATH@"
 451                 echol "$hook_call"
 452                 if [ -n "$hook_chain" ]; then
 453                         echol "exec \"\$0-chain$chain_num\" \"\$@\""
 454                 else
 455                         [ ! -s "$git_hooks_dir/$1" ] || cat "$git_hooks_dir/$1"
 456                 fi
 457         } >"$git_hooks_dir/$1+"
 458         chmod a+x "$git_hooks_dir/$1+"
 459         mv "$git_hooks_dir/$1+" "$git_hooks_dir/$1"
 460 }
 461
 462 # setup_ours (no arguments)
 463 setup_ours()
 464 {
 465         if [ ! -s "$git_common_dir/info/attributes" ] || ! grep -q topmsg "$git_common_dir/info/attributes"; then
 466                 [ -d "$git_common_dir/info" ] || mkdir "$git_common_dir/info"
 467                 {
 468                         echo ".topmsg   merge=ours"
 469                         echo ".topdeps  merge=ours"
 470                 } >>"$git_common_dir/info/attributes"
 471         fi
 472         if ! git config merge.ours.driver >/dev/null; then
 473                 git config merge.ours.name '"always keep ours" merge driver'
 474                 git config merge.ours.driver 'touch %A'
 475         fi
 476 }
 477
 478 # measure_branch NAME [BASE] [EXTRAHEAD...]
 479 measure_branch()
 480 {
 481         _bname="$1"; _base="$2"
 482         shift; shift
 483         [ -n "$_base" ] || _base="refs/$topbases/$(strip_ref "$_bname")"
 484         # The caller should've verified $name is valid
 485         _commits="$(git rev-list --count "$_bname" "$@" ^"$_base" --)"
 486         _nmcommits="$(git rev-list --count --no-merges "$_bname" "$@" ^"$_base" --)"
 487         if [ $_commits -ne 1 ]; then
 488                 _suffix="commits"
 489         else
 490                 _suffix="commit"
 491         fi
 492         echo "$_commits/$_nmcommits $_suffix"
 493 }
 494
 495 # true if $1 is contained by (or the same as) $2
 496 # this is never slower than merge-base --is-ancestor and is often slightly faster
 497 contained_by()
 498 {
 499         [ "$(git rev-list --count --max-count=1 "$1" --not "$2" --)" = "0" ]
 500 }
 501
 502 # branch_contains B1 B2
 503 # Whether B1 is a superset of B2.
 504 branch_contains()
 505 {
 506         _revb1="$(ref_exists_rev "$1")" || return 0
 507         _revb2="$(ref_exists_rev "$2")" || return 0
 508         if [ -s "$tg_cache_dir/$1/.bc/$2/.d" ]; then
 509                 if read _result _rev_matchb1 _rev_matchb2 &&
 510                         [ "$_revb1" = "$_rev_matchb1" -a "$_revb2" = "$_rev_matchb2" ]; then
 511                         return $_result
 512                 fi <"$tg_cache_dir/$1/.bc/$2/.d"
 513         fi
 514         [ -d "$tg_cache_dir/$1/.bc/$2" ] || mkdir -p "$tg_cache_dir/$1/.bc/$2" 2>/dev/null || :
 515         _result=0
 516         contained_by "$_revb2" "$_revb1" || _result=1
 517         if [ -d "$tg_cache_dir/$1/.bc/$2" ]; then
 518                 echo "$_result" "$_revb1" "$_revb2" >"$tg_cache_dir/$1/.bc/$2/.d"
 519         fi
 520         return $_result
 521 }
 522
 523 create_ref_dirs()
 524 {
 525         [ ! -s "$tg_tmp_dir/tg~ref-dirs-created" -a -s "$tg_ref_cache" ] || return 0
 526         awk -v p="$tg_tmp_dir/cached/" '{print p $1}' <"$tg_ref_cache" | tr '\n' '\0' | xargs -0 mkdir -p
 527         awk -v p="$tg_tmp_dir/cached/" '
 528                 NF == 2 && $1 ~ /^refs\/./ && $2 ~ /^[0-9a-fA-F]{4,}$/ {
 529                         fn = p $1 "/.ref"
 530                         print "0 " $2 >fn
 531                         close fn
 532                 }
 533         ' <"$tg_ref_cache"
 534         echo 1 >"$tg_tmp_dir/tg~ref-dirs-created"
 535 }
 536
 537 # If the first argument is non-empty, stores "1" there if this call created the cache
 538 v_create_ref_cache()
 539 {
 540         [ -n "$tg_ref_cache" -a ! -s "$tg_ref_cache" ] || return 0
 541         _remotespec=
 542         [ -z "$base_remote" ] || _remotespec="refs/remotes/$base_remote"
 543         [ -z "$1" ] || eval "$1=1"
 544         git for-each-ref --format='%(refname) %(objectname)' \
 545                 refs/heads "refs/$topbases" $_remotespec >"$tg_ref_cache"
 546         create_ref_dirs
 547 }
 548
 549 remove_ref_cache()
 550 {
 551         [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ] || return 0
 552         >"$tg_ref_cache"
 553         >"$tg_ref_cache_br"
 554         >"$tg_ref_cache_rbr"
 555         >"$tg_ref_cache_ann"
 556         >"$tg_ref_cache_dep"
 557 }
 558
 559 # setting tg_ref_cache_only to non-empty will force non-$tg_ref_cache lookups to fail
 560 rev_parse()
 561 {
 562         if [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ]; then
 563                 awk -v r="$1" 'BEGIN {e=1}; $1 == r {print $2; e=0; exit}; END {exit e}' <"$tg_ref_cache"
 564         else
 565                 [ -z "$tg_ref_cache_only" ] || return 1
 566                 git rev-parse --quiet --verify "$1^0" -- 2>/dev/null
 567         fi
 568 }
 569
 570 # ref_exists_rev REF
 571 # Whether REF is a valid ref name
 572 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 573 # or, if $base_remote is set, refs/remotes/$base_remote/
 574 # Caches result if $tg_read_only and outputs HASH on success
 575 ref_exists_rev()
 576 {
 577         case "$1" in
 578                 refs/*)
 579                         ;;
 580                 $octet20)
 581                         printf '%s' "$1"
 582                         return;;
 583                 *)
 584                         die "ref_exists_rev requires fully-qualified ref name (given: $1)"
 585         esac
 586         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify "$1^0" -- 2>/dev/null; return; }
 587         _result=
 588         _result_rev=
 589         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.ref"; } 2>/dev/null || :
 590         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 591         _result_rev="$(rev_parse "$1")"
 592         _result=$?
 593         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 594         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 595         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.ref" 2>/dev/null || :
 596         printf '%s' "$_result_rev"
 597         return $_result
 598 }
 599
 600 # Same as ref_exists_rev but output is abbreviated hash
 601 # Optional second argument defaults to --short but may be any --short=.../--no-short option
 602 ref_exists_rev_short()
 603 {
 604         case "$1" in
 605                 refs/*)
 606                         ;;
 607                 $octet20)
 608                         ;;
 609                 *)
 610                         die "ref_exists_rev_short requires fully-qualified ref name"
 611         esac
 612         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify ${2:---short} "$1^0" -- 2>/dev/null; return; }
 613         _result=
 614         _result_rev=
 615         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.rfs"; } 2>/dev/null || :
 616         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 617         _result_rev="$(rev_parse "$1")"
 618         _result=$?
 619         if [ $_result -eq 0 ]; then
 620                 _result_rev="$(git rev-parse --verify ${2:---short} --quiet "$_result_rev" --)"
 621                 _result=$?
 622         fi
 623         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 624         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 625         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.rfs" 2>/dev/null || :
 626         printf '%s' "$_result_rev"
 627         return $_result
 628 }
 629
 630 # ref_exists REF
 631 # Whether REF is a valid ref name
 632 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 633 # or, if $base_remote is set, refs/remotes/$base_remote/
 634 # Caches result
 635 ref_exists()
 636 {
 637         ref_exists_rev "$1" >/dev/null
 638 }
 639
 640 # rev_parse_tree REF
 641 # Runs git rev-parse REF^{tree}
 642 # Caches result if $tg_read_only
 643 rev_parse_tree()
 644 {
 645         [ -n "$tg_read_only" ] || { git rev-parse --verify "$1^{tree}" -- 2>/dev/null; return; }
 646         if [ -f "$tg_tmp_dir/cached/$1/.rpt" ]; then
 647                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 648                         printf '%s\n' "$_result"
 649                         return 0
 650                 fi
 651                 return 1
 652         fi
 653         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null || :
 654         if [ -d "$tg_tmp_dir/cached/$1" ]; then
 655                 git rev-parse --verify "$1^{tree}" -- >"$tg_tmp_dir/cached/$1/.rpt" 2>/dev/null || :
 656                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 657                         printf '%s\n' "$_result"
 658                         return 0
 659                 fi
 660                 return 1
 661         fi
 662         git rev-parse --verify "$1^{tree}" -- 2>/dev/null
 663 }
 664
 665 # has_remote BRANCH
 666 # Whether BRANCH has a remote equivalent (accepts ${topbases#heads/}/ too)
 667 has_remote()
 668 {
 669         [ -n "$base_remote" ] && ref_exists "refs/remotes/$base_remote/$1"
 670 }
 671
 672 # Return the verified TopGit branch name for "$2" in "$1" or die with an error.
 673 # If -z "$1" still set return code but do not return result
 674 # As a convenience, if HEAD or @ is given and HEAD is a symbolic ref to
 675 # refs/heads/... then ... will be verified instead.
 676 # if "$3" = "-f" (for fail) then return an error rather than dying.
 677 v_verify_topgit_branch()
 678 {
 679         if [ "$2" = "HEAD" ] || [ "$2" = "@" ]; then
 680                 _verifyname="$(git symbolic-ref HEAD 2>/dev/null)" || :
 681                 [ -n "$_verifyname" -o "$3" = "-f" ] || die "HEAD is not a symbolic ref"
 682                 case "$_verifyname" in refs/"$topbases"/*|refs/heads/*);;*)
 683                         [ "$3" != "-f" ] || return 1
 684                         die "HEAD is not a symbolic ref to the refs/heads namespace"
 685                 esac
 686                 set -- "$1" "$_verifyname" "$3"
 687         fi
 688         case "$2" in
 689                 refs/"$topbases"/*)
 690                         _verifyname="${2#refs/$topbases/}"
 691                         ;;
 692                 refs/heads/*)
 693                         _verifyname="${2#refs/heads/}"
 694                         ;;
 695                 *)
 696                         _verifyname="$2"
 697                         ;;
 698         esac
 699         if ! ref_exists "refs/heads/$_verifyname"; then
 700                 [ "$3" != "-f" ] || return 1
 701                 die "no such branch: $_verifyname"
 702         fi
 703         if ! ref_exists "refs/$topbases/$_verifyname"; then
 704                 [ "$3" != "-f" ] || return 1
 705                 die "not a TopGit-controlled branch: $_verifyname"
 706         fi
 707         [ -z "$1" ] || eval "$1="'"$_verifyname"'
 708 }
 709
 710 # Return the verified TopGit branch name or die with an error.
 711 # As a convenience, if HEAD or @ is given and HEAD is a symbolic ref to
 712 # refs/heads/... then ... will be verified instead.
 713 # if "$2" = "-f" (for fail) then return an error rather than dying.
 714 verify_topgit_branch()
 715 {
 716         v_verify_topgit_branch _verifyname "$@" || return
 717         printf '%s' "$_verifyname"
 718 }
 719
 720 # Caches result
 721 # $1 = branch name (i.e. "t/foo/bar")
 722 # $2 = optional result of rev-parse "refs/heads/$1"
 723 # $3 = optional result of rev-parse "refs/$topbases/$1"
 724 branch_annihilated()
 725 {
 726         _branch_name="$1"
 727         _rev="${2:-$(ref_exists_rev "refs/heads/$_branch_name")}"
 728         _rev_base="${3:-$(ref_exists_rev "refs/$topbases/$_branch_name")}"
 729
 730         _result=
 731         _result_rev=
 732         _result_rev_base=
 733         { read -r _result _result_rev _result_rev_base <"$tg_cache_dir/refs/heads/$_branch_name/.ann"; } 2>/dev/null || :
 734         [ -z "$_result" -o "$_result_rev" != "$_rev" -o "$_result_rev_base" != "$_rev_base" ] || return $_result
 735
 736         # use the merge base in case the base is ahead.
 737         mb="$(git merge-base "$_rev_base" "$_rev" 2>/dev/null)"
 738
 739         test -z "$mb" || test "$(rev_parse_tree "$mb")" = "$(rev_parse_tree "$_rev")"
 740         _result=$?
 741         [ -d "$tg_cache_dir/refs/heads/$_branch_name" ] || mkdir -p "$tg_cache_dir/refs/heads/$_branch_name" 2>/dev/null
 742         [ ! -d "$tg_cache_dir/refs/heads/$_branch_name" ] ||
 743         echo $_result $_rev $_rev_base >"$tg_cache_dir/refs/heads/$_branch_name/.ann" 2>/dev/null || :
 744         return $_result
 745 }
 746
 747 non_annihilated_branches()
 748 {
 749         refscacheopt=
 750         if [ -n "$tg_read_only" ] && [ -n "$tg_ref_cache" ] && [ -s "$tg_ref_cache" ]; then
 751                 refscacheopt='-r="$tg_ref_cache" "refs/$topbases"'
 752         fi
 753         eval run_awk_topgit_branches -n "$refscacheopt" '"refs/$topbases" "$@"'
 754 }
 755
 756 # Make sure our tree is clean
 757 # if optional "$1" given also verify that a checkout to "$1" would succeed
 758 ensure_clean_tree()
 759 {
 760         check_status
 761         [ -z "$tg_state$git_state" ] || { do_status; exit 1; }
 762         git update-index --ignore-submodules --refresh ||
 763                 die "the working directory has uncommitted changes (see above) - first commit or reset them"
 764         [ -z "$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)" ] ||
 765                 die "the index has uncommited changes"
 766         [ -z "$1" ] || git read-tree -n -u -m "$1" ||
 767                 die "git checkout \"$1\" would fail"
 768 }
 769
 770 # Make sure .topdeps and .topmsg are "clean"
 771 # They are considered "clean" if each is identical in worktree, index and HEAD
 772 # With "-u" as the argument skip the HEAD check (-u => unborn)
 773 # untracked .topdeps and/or .topmsg files are always considered "dirty" as well
 774 # with -u them just existing constitutes "dirty"
 775 ensure_clean_topfiles()
 776 {
 777         _dirtw=0
 778         _dirti=0
 779         _dirtu=0
 780         _check="$(git diff-files --ignore-submodules --name-only -- :/.topdeps :/.topmsg)" &&
 781         [ -z "$_check" ] || _dirtw=1
 782         if [ "$1" != "-u" ]; then
 783                 _check="$(git diff-index --cached --ignore-submodules --name-only HEAD -- :/.topdeps :/.topmsg)" &&
 784                 [ -z "$_check" ] || _dirti=1
 785         fi
 786         if [ "$_dirti$_dirtw" = "00" ]; then
 787                 v_get_show_cdup
 788                 if [ -e "${git_cdup_result}.topdeps" ] || [ -e "${git_cdup_result}.topmsg" ]; then
 789                         [ "$1" != "-u" ] &&
 790                         _check="$(git status --porcelain --ignored --untracked-files --ignore-submodules -- :/.topdeps :/.topmsg)" &&
 791                         [ -z "$_check" ] || _dirtu=1
 792                 fi
 793         fi
 794         if [ "$_dirtu$_dirti$_dirtw" != "000" ]; then
 795                 git status --ignored --untracked-files --ignore-submodules -- :/.topdeps :/.topmsg || :
 796                 case "$_dirtu$_dirti$_dirtw" in
 797                 001) die "the working directory has uncommitted changes (see above) - first commit or reset them";;
 798                 010) die "the index has uncommited changes (see above)";;
 799                 011) die "the working directory and index have uncommitted changes (see above) - first commit or reset them";;
 800                 100) die "the working directory has untracked files that would be overwritten (see above)";;
 801                 esac
 802         fi
 803 }
 804
 805 # is_sha1 REF
 806 # Whether REF is a SHA1 (compared to a symbolic name).
 807 is_sha1()
 808 {
 809         case "$1" in $octet20) return 0;; esac
 810         return 1
 811 }
 812
 813 # navigate_deps <run_awk_topgit_navigate options and arguments>
 814 # all options and arguments are passed through to run_awk_topgit_navigate
 815 # except for a leading -td= option, if any, which is picked off for deps
 816 # after arranging to feed it a suitable deps list
 817 navigate_deps()
 818 {
 819         dogfer=
 820         dorad=1
 821         userc=
 822         tmpdep=
 823         ratd_opts=
 824         ratn_opts=
 825         if [ -n "$tg_read_only" ] && [ -n "$tg_ref_cache" ]; then
 826                 userc=1
 827                 tmprfs="$tg_ref_cache"
 828                 tmptgbr="$tg_ref_cache_br"
 829                 tmpann="$tg_ref_cache_ann"
 830                 tmpdep="$tg_ref_cache_dep"
 831                 [ -s "$tg_ref_cache" ] || dogfer=1
 832                 [ -n "$dogfer" ] || ! [ -s "$tmptgbr" ] || ! [ -f "$tmpann" ] || ! [ -s "$tmpdep" ] || dorad=
 833         else
 834                 ratd_opts="-rmr"
 835                 ratn_opts="-rma -rmb"
 836                 tmprfs="$tg_tmp_dir/refs.$$"
 837                 tmpann="$tg_tmp_dir/ann.$$"
 838                 tmptgbr="$tg_tmp_dir/tgbr.$$"
 839                 dogfer=1
 840         fi
 841         refpats="\"refs/heads\" \"refs/\$topbases\""
 842         [ -z "$base_remote" ] || refpats="$refpats \"refs/remotes/\$base_remote\""
 843         [ -z "$dogfer" ] ||
 844         eval git for-each-ref '--format="%(refname) %(objectname)"' "$refpats" >"$tmprfs"
 845         depscmd="run_awk_topgit_deps $ratd_opts"
 846         case "$1" in -td=*)
 847                 userc=
 848                 depscmd="$depscmd $1"
 849                 shift
 850         esac
 851         depscmd="$depscmd"' -a="$tmpann" -b="$tmptgbr" -r="$tmprfs" -m="$mtblob" -s "refs/$topbases"'
 852         if [ -n "$userc" ]; then
 853                 if [ -n "$dorad" ]; then
 854                         eval "$depscmd" >"$tmpdep"
 855                 fi
 856                 depscmd='<"$tmpdep" '
 857         else
 858                 depscmd="$depscmd |"
 859         fi
 860         eval "$depscmd" run_awk_topgit_navigate '-a="$tmpann" -b="$tmptgbr"' "$ratn_opts" '"$@"'
 861 }
 862
 863 # recurse_deps_internal NAME [BRANCHPATH...]
 864 # get recursive list of dependencies with leading 0 if branch exists 1 if missing
 865 # followed by a 1 if the branch is "tgish" (2 if it also has a remote); 0 if not
 866 # followed by a 0 for a non-leaf, 1 for a leaf or 2 for annihilated tgish
 867 # but missing and remotes are always "0"
 868 # then the branch name followed by its depedency chain (which might be empty)
 869 # An output line might look like this:
 870 #   0 1 1 t/foo/leaf t/foo/int t/stage
 871 # If no_remotes is non-empty, exclude remotes
 872 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
 873 # If with_top_level is non-empty, include the top-level that's normally omitted
 874 # any branch names in the space-separated recurse_deps_exclude variable
 875 # are skipped (along with their dependencies)
 876 recurse_deps_internal()
 877 {
 878         case " $recurse_deps_exclude " in *" $1 "*) return 0; esac
 879         ratr_opts="${recurse_preorder:+-f} ${with_top_level:+-s}"
 880         dogfer=
 881         dorad=1
 882         userc=
 883         tmpdep=
 884         if [ -n "$tg_read_only" ] && [ -n "$tg_ref_cache" ]; then
 885                 userc=1
 886                 tmprfs="$tg_ref_cache"
 887                 tmptgbr="$tg_ref_cache_br"
 888                 tmpann="$tg_ref_cache_ann"
 889                 tmpdep="$tg_ref_cache_dep"
 890                 [ -s "$tg_ref_cache" ] || dogfer=1
 891                 [ -n "$dogfer" ] || ! [ -s "$tmptgbr" ] || ! [ -f "$tmpann" ] || ! [ -s "$tmpdep" ] || dorad=
 892         else
 893                 ratr_opts="$ratr_opts -rmh -rma -rmb"
 894                 tmprfs="$tg_tmp_dir/refs.$$"
 895                 tmpann="$tg_tmp_dir/ann.$$"
 896                 tmptgbr="$tg_tmp_dir/tgbr.$$"
 897                 dogfer=1
 898         fi
 899         refpats="\"refs/heads\" \"refs/\$topbases\""
 900         [ -z "$base_remote" ] || refpats="$refpats \"refs/remotes/\$base_remote\""
 901         tmptgrmtbr=
 902         dorab=1
 903         if [ -z "$no_remotes" ] && [ -n "$base_remote" ]; then
 904                 if [ -n "$userc" ]; then
 905                         tmptgrmtbr="$tg_ref_cache_rbr"
 906                         [ -n "$dogfer" ] || ! [ -s "$tmptgrmtbr" ] || dorab=
 907                 else
 908                         tmptgrmtbr="$tg_tmp_dir/tgrmtbr.$$"
 909                         ratr_opts="$ratr_opts -rmr"
 910                 fi
 911                 ratr_opts="$ratr_opts -r=\"\$tmptgbr\" -u=\"refs/remotes/\$base_remote/\${topbases#heads/}\""
 912         fi
 913         [ -z "$dogfer" ] ||
 914         eval git for-each-ref '--format="%(refname) %(objectname)"' "$refpats" >"$tmprfs"
 915         if [ -n "$tmptgrmtbr" ] && [ -n "$dorab" ]; then
 916                 run_awk_topgit_branches -n -h="refs/remotes/$base_remote" -r="$tmprfs" \
 917                         "refs/remotes/$base_remote/${topbases#heads/}" >"$tmptgrmtbr"
 918         fi
 919         depscmd='run_awk_topgit_deps -a="$tmpann" -b="$tmptgbr" -r="$tmprfs" -m="$mtblob" "refs/$topbases"'
 920         if [ -n "$userc" ]; then
 921                 if [ -n "$dorad" ]; then
 922                         eval "$depscmd" >"$tmpdep"
 923                 fi
 924                 depscmd='<"$tmpdep" '
 925         else
 926                 depscmd="$depscmd |"
 927         fi
 928         eval "$depscmd" run_awk_topgit_recurse '-a="$tmpann" -b="$tmptgbr"' \
 929                 '-c=1 -h="$tmprfs"' "$ratr_opts" '-x="$recurse_deps_exclude"' '"$@"'
 930 }
 931
 932 # do_eval CMD
 933 # helper for recurse_deps so that a return statement executed inside CMD
 934 # does not return from recurse_deps.  This shouldn't be necessary, but it
 935 # seems that it actually is.
 936 do_eval()
 937 {
 938         eval "$@"
 939 }
 940
 941 # becomes read-only for caching purposes
 942 # assigns new value to tg_read_only
 943 # become_cacheable/undo_become_cacheable calls may be nested
 944 become_cacheable()
 945 {
 946         _old_tg_read_only="$tg_read_only"
 947         if [ -z "$tg_read_only" ]; then
 948                 ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 949                 rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 950                 tg_read_only=1
 951         fi
 952         _my_ref_cache=
 953         v_create_ref_cache _my_ref_cache
 954         _my_ref_cache="${_my_ref_cache:+1}"
 955         tg_read_only="undo${_my_ref_cache:-0}-$_old_tg_read_only"
 956 }
 957
 958 # restores tg_read_only and ref_cache to state before become_cacheable call
 959 # become_cacheable/undo_bocome_cacheable calls may be nested
 960 undo_become_cacheable()
 961 {
 962         case "$tg_read_only" in
 963                 "undo"[01]"-"*)
 964                         _suffix="${tg_read_only#undo?-}"
 965                         [ "${tg_read_only%$_suffix}" = "undo0-" ] || remove_ref_cache
 966                         tg_read_only="$_suffix"
 967         esac
 968 }
 969
 970 # just call this, no undo, sets tg_read_only= and removes ref cache and cached results
 971 become_non_cacheable()
 972 {
 973         remove_ref_cache
 974         tg_read_only=
 975         ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 976         rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 977 }
 978
 979 # call this to make sure Git will not complain about a missing user/email
 980 # result is cached in TG_IDENT_CHECKED and a non-empty value suppresses the check
 981 ensure_ident_available()
 982 {
 983         [ -z "$TG_IDENT_CHECKED" ] || return 0
 984         git var GIT_AUTHOR_IDENT >/dev/null &&
 985         git var GIT_COMMITTER_IDENT >/dev/null || exit
 986         TG_IDENT_CHECKED=1
 987         export TG_IDENT_CHECKED
 988         return 0
 989 }
 990
 991 # recurse_deps [-o=<options string>] CMD NAME [BRANCHPATH...]
 992 # Recursively eval CMD on all dependencies of NAME.
 993 # Dependencies are visited in topological order.
 994 # If <options string> is given, it's eval'd into the recurse_deps_internal
 995 # call just before the "--" that's passed just before NAME
 996 # CMD can refer to the following variables:
 997 #
 998 #   _ret              starts as 0; CMD can change; will be final return result
 999 #   _dep              bare branch name or "refs/remotes/..." for a remote base
1000 #   _name             has $_dep in its .topdeps ("" for top and $with_top_level)
1001 #   _depchain         0+ space-separated branch names forming a path to top
1002 #   _dep_missing      boolean "1" if no such $_dep ref; "" if ref present
1003 #   _dep_is_leaf      boolean "1" if leaf; "" if not
1004 #   _dep_is_tgish     boolean "1" if tgish; "" if not (which implies no remote)
1005 #   _dep_has_remote   boolean "1" if $_dep has_remote; "" if not
1006 #   _dep_annihilated  boolean "1" if $_dep annihilated; "" if not
1007 #
1008 # CMD may use a "return" statement without issue; its return value is ignored,
1009 # but if CMD sets _ret to a negative value, e.g. "-0" or "-1" the enumeration
1010 # will stop immediately and the value with the leading "-" stripped off will
1011 # be the final result code
1012 #
1013 # CMD can refer to $_name for queried branch name,
1014 # $_dep for dependency name,
1015 # $_depchain for space-seperated branch backtrace,
1016 # $_dep_missing boolean to check whether $_dep is present
1017 # and the $_dep_is_tgish and $_dep_annihilated booleans.
1018 # If recurse_preorder is NOT set then the $_dep_is_leaf boolean is also valid.
1019 # It can modify $_ret to affect the return value
1020 # of the whole function.
1021 # If recurse_deps() hits missing dependencies, it will append
1022 # them to space-separated $missing_deps list and skip them
1023 # after calling CMD with _dep_missing set.
1024 # remote dependencies are processed if no_remotes is unset.
1025 # any branch names in the space-separated recurse_deps_exclude variable
1026 # are skipped (along with their dependencies)
1027 #
1028 # If no_remotes is non-empty, exclude remotes
1029 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
1030 # If with_top_level is non-empty, include the top-level that's normally omitted
1031 # any branch names in the space-separated recurse_deps_exclude variable
1032 # are skipped (along with their dependencies)
1033 recurse_deps()
1034 {
1035         _opts=
1036         case "$1" in -o=*) _opts="${1#-o=}"; shift; esac
1037         _cmd="$1"; shift
1038
1039         _depsfile="$(get_temp tg-depsfile)"
1040         eval recurse_deps_internal "$_opts" -- '"$@"' >"$_depsfile" || :
1041
1042         _ret=0
1043         while read _ismissing _istgish _isleaf _dep _name _deppath; do
1044                 _depchain="$_name${_deppath:+ $_deppath}"
1045                 _dep_is_tgish=
1046                 [ "$_istgish" = "0" ] || _dep_is_tgish=1
1047                 _dep_has_remote=
1048                 [ "$_istgish" != "2" ] || _dep_has_remote=1
1049                 _dep_missing=
1050                 if [ "$_ismissing" != "0" ]; then
1051                         _dep_missing=1
1052                         case " $missing_deps " in *" $_dep "*);;*)
1053                                 missing_deps="${missing_deps:+$missing_deps }$_dep"
1054                         esac
1055                 fi
1056                 _dep_annihilated=
1057                 _dep_is_leaf=
1058                 if [ "$_isleaf" = "1" ]; then
1059                         _dep_is_leaf=1
1060                 elif [ "$_isleaf" = "2" ]; then
1061                         _dep_annihilated=1
1062                 fi
1063                 do_eval "$_cmd" || :
1064                 if [ "${_ret#-}" != "$_ret" ]; then
1065                         _ret="${_ret#-}"
1066                         break
1067                 fi
1068         done <"$_depsfile"
1069         rm -f "$_depsfile"
1070         return ${_ret:-0}
1071 }
1072
1073 # find_leaves NAME
1074 # output (one per line) the unique leaves of NAME
1075 # a leaf is either
1076 #   1) a non-tgish dependency
1077 #   2) the base of a tgish dependency with no non-annihilated dependencies
1078 # duplicates are suppressed (by commit rev) and remotes are always ignored
1079 # if a leaf has an exact tag match that will be output
1080 # note that recurse_deps_exclude IS honored for this operation
1081 find_leaves()
1082 {
1083         no_remotes=1
1084         with_top_level=1
1085         recurse_preorder=
1086         seen_leaf_refs=
1087         seen_leaf_revs=
1088         while read _ismissing _istgish _isleaf _dep _name _deppath; do
1089                 [ "$_isleaf" = "1" ] && [ "$_ismissing" = "0" ] || continue
1090                 if [ "$_istgish" != "0" ]; then
1091                         fulldep="refs/$topbases/$_dep"
1092                 else
1093                         fulldep="refs/heads/$_dep"
1094                 fi
1095                 case " $seen_leaf_refs " in *" $fulldep "*);;*)
1096                         seen_leaf_refs="${seen_leaf_refs:+$seen_leaf_refs }$fulldep"
1097                         if fullrev="$(ref_exists_rev "$fulldep")"; then
1098                                 case " $seen_leaf_revs " in *" $fullrev "*);;*)
1099                                         seen_leaf_revs="${seen_leaf_revs:+$seen_leaf_revs }$fullrev"
1100                                         # See if Git knows it by another name
1101                                         if tagname="$(git describe --exact-match "$fullrev" 2>/dev/null)" && [ -n "$tagname" ]; then
1102                                                 echo "refs/tags/$tagname"
1103                                         else
1104                                                 echo "$fulldep"
1105                                         fi
1106                                 esac
1107                         fi
1108                 esac
1109         done <<-EOT
1110         $(recurse_deps_internal -l -o=1 -- "$1")
1111         EOT
1112         with_top_level=
1113 }
1114
1115 # branch_needs_update
1116 # This is a helper function for determining whether given branch
1117 # is up-to-date wrt. its dependencies. It expects input as if it
1118 # is called as a recurse_deps() helper.
1119 # In case the branch does need update, it will echo it together
1120 # with the branch backtrace on the output (see needs_update()
1121 # description for details) and set $_ret to non-zero.
1122 branch_needs_update()
1123 {
1124         if [ -n "$_dep_missing" ]; then
1125                 echo "! $_dep $_depchain"
1126                 return 0
1127         fi
1128
1129         if [ -n "$_dep_is_tgish" ]; then
1130                 [ -z "$_dep_annihilated" ] || return 0
1131
1132                 if [ -n "$_dep_has_remote" ]; then
1133                         branch_contains "refs/heads/$_dep" "refs/remotes/$base_remote/$_dep" ||
1134                                 echo "refs/remotes/$base_remote/$_dep $_dep $_depchain"
1135                 fi
1136                 # We want to sync with our base first and should output this before
1137                 # the remote branch, but the order does not actually matter to tg-update
1138                 # as it just recurses regardless, but it does matter for tg-info (which
1139                 # treats out-of-date bases as though they were already merged in) so
1140                 # we output the remote before the base.
1141                 branch_contains "refs/heads/$_dep" "refs/$topbases/$_dep" || {
1142                         echo ": $_dep $_depchain"
1143                         _ret=1
1144                         return
1145                 }
1146         fi
1147
1148         if [ -n "$_name" ]; then
1149                 case "$_dep" in refs/*) _fulldep="$_dep";; *) _fulldep="refs/heads/$_dep";; esac
1150                 if ! branch_contains "refs/$topbases/$_name" "$_fulldep"; then
1151                         # Some new commits in _dep
1152                         echo "$_dep $_depchain"
1153                         _ret=1
1154                 fi
1155         fi
1156 }
1157
1158 # needs_update NAME
1159 # This function is recursive; it outputs reverse path from NAME
1160 # to the branch (e.g. B_DIRTY B1 B2 NAME), one path per line,
1161 # inner paths first. Innermost name can be refs/remotes/<remote>/<name>
1162 # if the head is not in sync with the <remote> branch <name>, ':' if
1163 # the head is not in sync with the base (in this order of priority)
1164 # or '!' if dependency is missing.  Note that the remote branch, base
1165 # order is reversed from the order they will actually be updated in
1166 # order to accomodate tg info which treats out-of-date items that are
1167 # only in the base as already being in the head for status purposes.
1168 # It will also return non-zero status if NAME needs update.
1169 # If needs_update() hits missing dependencies, it will append
1170 # them to space-separated $missing_deps list and skip them.
1171 needs_update()
1172 {
1173         recurse_deps branch_needs_update "$1"
1174 }
1175
1176 # branch_empty NAME [-i | -w]
1177 branch_empty()
1178 {
1179         if [ -z "$2" ]; then
1180                 _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
1181                 _result=
1182                 _result_rev=
1183                 { read -r _result _result_rev <"$tg_cache_dir/refs/heads/$1/.mt"; } 2>/dev/null || :
1184                 [ -z "$_result" -o "$_result_rev" != "$_rev" ] || return $_result
1185                 _result=0
1186                 [ "$(pretty_tree -t "$1" -b)" = "$(pretty_tree -t "$1" $2)" ] || _result=$?
1187                 [ -d "$tg_cache_dir/refs/heads/$1" ] || mkdir -p "$tg_cache_dir/refs/heads/$1" 2>/dev/null
1188                 [ ! -d "$tg_cache_dir/refs/heads/$1" ] || echo $_result $_rev >"$tg_cache_dir/refs/heads/$1/.mt"
1189                 return $_result
1190         else
1191                 [ "$(pretty_tree -t "$1" -b)" = "$(pretty_tree -t "$1" $2)" ]
1192         fi
1193 }
1194
1195 v_get_tdmopt_internal()
1196 {
1197         [ -n "$1" ] && [ -n "$3" ] || return 0
1198         [ "$2" = "-i" ] || [ "$2" = "-w" ] || return 0
1199         _optval=
1200         if v_verify_topgit_branch _tghead "HEAD" -f; then
1201                 if [ "$2" = "-w" ] && [ -f "$root_dir/$3" ] && [ -r "$root_dir/$3" ]; then
1202                         _opthash=
1203                         if _opthash="$(git hash-object -w -t blob --stdin <"$root_dir/$3")" && [ -n "$_opthash" ]; then
1204                                 _optval="$4\"$_tghead:$_opthash\""
1205                         fi
1206                 elif [ "$2" = "-i" ]; then
1207                         if _opthash="$(git rev-parse --quiet --verify ":0:$3" --)" && [ -n "$_opthash" ]; then
1208                                 _optval="$4\"$_tghead:$_opthash\""
1209                         fi
1210                 fi
1211         fi
1212         eval "$1="'"$_optval"'
1213 }
1214
1215 # set var $1 to the correct -td= option for use in an eval for $2 -i or -w mode
1216 v_get_tdopt() { v_get_tdmopt_internal "$1" "$2" ".topdeps" "-td="; }
1217
1218 # set var $1 to the correct -tm= option for use in an eval for $2 -i or -w mode
1219 v_get_tmopt() { v_get_tdmopt_internal "$1" "$2" ".topmsg" "-tm="; }
1220
1221 # checkout_symref_full [-f] FULLREF [SEED]
1222 # Just like git checkout $iowopt -b FULLREF [SEED] except that FULLREF MUST start with
1223 # refs/ and HEAD is ALWAYS set to a symref to it and [SEED] (default is FULLREF)
1224 # MUST be a committish which if present will be used instead of current FULLREF
1225 # (and FULLREF will be updated to it as well in that case)
1226 # Any merge state is always cleared by this function
1227 # With -f it's like git checkout $iowopt -f -b FULLREF (uses read-tree --reset
1228 # instead of -m) but it will clear out any unmerged entries
1229 # As an extension, FULLREF may also be a full hash to create a detached HEAD instead
1230 checkout_symref_full()
1231 {
1232         _mode=-m
1233         _head="HEAD"
1234         if [ "$1" = "-f" ]; then
1235                 _mode="--reset"
1236                 _head=
1237                 shift
1238         fi
1239         _ishash=
1240         case "$1" in
1241                 refs/?*)
1242                         ;;
1243                 $octet20)
1244                         _ishash=1
1245                         [ -z "$2" ] || [ "$1" = "$2" ] ||
1246                                 die "programmer error: invalid checkout_symref_full \"$1\" \"$2\""
1247                         set -- HEAD "$1"
1248                         ;;
1249                 *)
1250                         die "programmer error: invalid checkout_symref_full \"$1\""
1251                         ;;
1252         esac
1253         _seedrev="$(git rev-parse --quiet --verify "${2:-$1}^0" --)" ||
1254                 die "invalid committish: \"${2:-$1}\""
1255         # Clear out any MERGE_HEAD kruft
1256         rm -f "$git_dir/MERGE_HEAD" || :
1257         # We have to do all the hard work ourselves :/
1258         # This is like git checkout -b "$1" "$2"
1259         # (or just git checkout "$1"),
1260         # but never creates a detached HEAD (unless $1 is a hash)
1261         git read-tree -u $_mode $_head "$_seedrev" &&
1262         {
1263                 [ -z "$2" ] && [ "$(git cat-file -t "$1")" = "commit" ] ||
1264                 git update-ref ${_ishash:+--no-deref} "$1" "$_seedrev"
1265         } && {
1266                 [ -n "$_ishash" ] || git symbolic-ref HEAD "$1"
1267         }
1268 }
1269
1270 # switch_to_base NAME [SEED]
1271 switch_to_base()
1272 {
1273         checkout_symref_full "refs/$topbases/$1" "$2"
1274 }
1275
1276 # run editor with arguments
1277 # the editor setting will be cached in $tg_editor (which is eval'd)
1278 # result non-zero if editor fails or GIT_EDITOR cannot be determined
1279 run_editor()
1280 {
1281         tg_editor="$GIT_EDITOR"
1282         [ -n "$tg_editor" ] || tg_editor="$(git var GIT_EDITOR)" || return $?
1283         eval "$tg_editor" '"$@"'
1284 }
1285
1286 # Show the help messages.
1287 do_help()
1288 {
1289         _www=
1290         if [ "$1" = "-w" ]; then
1291                 _www=1
1292                 shift
1293         fi
1294         if [ -z "$1" ] ; then
1295                 # This is currently invoked in all kinds of circumstances,
1296                 # including when the user made a usage error. Should we end up
1297                 # providing more than a short help message, then we should
1298                 # differentiate.
1299                 # Petr's comment: http://marc.info/?l=git&m=122718711327376&w=2
1300
1301                 ## Build available commands list for help output
1302
1303                 cmds=
1304                 sep=
1305                 for cmd in "$TG_INST_CMDDIR"/tg-[!-]*; do
1306                         ! [ -r "$cmd" ] && continue
1307                         # strip directory part and "tg-" prefix
1308                         cmd="${cmd##*/}"
1309                         cmd="${cmd#tg-}"
1310                         [ "$cmd" != "migrate-bases" ] || continue
1311                         [ "$cmd" != "summary" ] || cmd="st[atus]|$cmd"
1312                         cmds="$cmds$sep$cmd"
1313                         sep="|"
1314                 done
1315
1316                 echo "TopGit version $TG_VERSION - A different patch queue manager"
1317                 echo "Usage: $tgname [-C <dir>] [-r <remote> | -u]" \
1318                         "[-c <name>=<val>] [--no-pager] ($cmds) ..."
1319                 echo "   Or: $tgname help [-w] [<command>]"
1320                 echo "Use \"$tgdisplaydir$tgname help tg\" for overview of TopGit"
1321         elif [ -r "$TG_INST_CMDDIR"/tg-$1 -o -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1322                 if [ -n "$_www" ]; then
1323                         nohtml=
1324                         if ! [ -r "$TG_INST_SHAREDIR/topgit.html" ]; then
1325                                 echo "${0##*/}: missing html help file:" \
1326                                         "$TG_INST_SHAREDIR/topgit.html" 1>&2
1327                                 nohtml=1
1328                         fi
1329                         if ! [ -r "$TG_INST_SHAREDIR/tg-$1.html" ]; then
1330                                 echo "${0##*/}: missing html help file:" \
1331                                         "$TG_INST_SHAREDIR/tg-$1.html" 1>&2
1332                                 nohtml=1
1333                         fi
1334                         if [ -n "$nohtml" ]; then
1335                                 echo "${0##*/}: use" \
1336                                         "\"${0##*/} help $1\" instead" 1>&2
1337                                 exit 1
1338                         fi
1339                         git web--browse -c help.browser "$TG_INST_SHAREDIR/tg-$1.html"
1340                         exit
1341                 fi
1342                 output()
1343                 {
1344                         if [ -r "$TG_INST_CMDDIR"/tg-$1 ] ; then
1345                                 "$TG_INST_CMDDIR"/tg-$1 -h 2>&1 || :
1346                                 echo
1347                         elif [ "$1" = "help" ]; then
1348                                 echo "Usage: ${tgname:-tg} help [-w] [<command>]"
1349                                 echo
1350                         elif [ "$1" = "status" ] || [ "$1" = "st" ]; then
1351                                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1352                                 echo
1353                         fi
1354                         if [ -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1355                                 cat "$TG_INST_SHAREDIR/tg-$1.txt"
1356                         fi
1357                 }
1358                 page output "$1"
1359         else
1360                 echo "${0##*/}: no help for $1" 1>&2
1361                 do_help
1362                 exit 1
1363         fi
1364 }
1365
1366 check_status()
1367 {
1368         git_state=
1369         git_remove=
1370         if [ -e "$git_dir/MERGE_HEAD" ]; then
1371                 git_state="merge"
1372         elif [ -e "$git_dir/rebase-apply/applying" ]; then
1373                 git_state="am"
1374                 git_remove="$git_dir/rebase-apply"
1375         elif [ -e "$git_dir/rebase-apply" ]; then
1376                 git_state="rebase"
1377                 git_remove="$git_dir/rebase-apply"
1378         elif [ -e "$git_dir/rebase-merge" ]; then
1379                 git_state="rebase"
1380                 git_remove="$git_dir/rebase-merge"
1381         elif [ -e "$git_dir/CHERRY_PICK_HEAD" ]; then
1382                 git_state="cherry-pick"
1383         elif [ -e "$git_dir/BISECT_LOG" ]; then
1384                 git_state="bisect"
1385         elif [ -e "$git_dir/REVERT_HEAD" ]; then
1386                 git_state="revert"
1387         fi
1388         git_remove="${git_remove#./}"
1389
1390         tg_state=
1391         tg_remove=
1392         tg_topmerge=
1393         if [ -e "$git_dir/tg-update" ]; then
1394                 tg_state="update"
1395                 tg_remove="$git_dir/tg-update"
1396                 ! [ -s "$git_dir/tg-update/merging_topfiles" ] || tg_topmerge=1
1397         fi
1398         tg_remove="${tg_remove#./}"
1399 }
1400
1401 # Show status information
1402 do_status()
1403 {
1404         do_status_result=0
1405         do_status_verbose=
1406         do_status_help=
1407         abbrev=refs
1408         pfx=
1409         while [ $# -gt 0 ] && case "$1" in
1410                 --help|-h)
1411                         do_status_help=1
1412                         break;;
1413                 -vv)
1414                         # kludge in this common bundling option
1415                         abbrev=
1416                         do_status_verbose=1
1417                         pfx="## "
1418                         ;;
1419                 --verbose|-v)
1420                         [ -z "$do_status_verbose" ] || abbrev=
1421                         do_status_verbose=1
1422                         pfx="## "
1423                         ;;
1424                 --exit-code)
1425                         do_status_result=2
1426                         ;;
1427                 *)
1428                         die "unknown status argument: $1"
1429                         ;;
1430         esac; do shift; done
1431         if [ -n "$do_status_help" ]; then
1432                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1433                 return
1434         fi
1435         check_status
1436         symref="$(git symbolic-ref --quiet HEAD)" || :
1437         headrv="$(git rev-parse --quiet --verify ${abbrev:+--short} HEAD --)" || :
1438         if [ -n "$symref" ]; then
1439                 uprefpart=
1440                 if [ -n "$headrv" ]; then
1441                         upref="$(git rev-parse --symbolic-full-name @{upstream} 2>/dev/null)" || :
1442                         if [ -n "$upref" ]; then
1443                                 uprefpart=" ... ${upref#$abbrev/remotes/}"
1444                                 mbase="$(git merge-base HEAD "$upref")" || :
1445                                 ahead="$(git rev-list --count HEAD ${mbase:+--not $mbase})" || ahead=0
1446                                 behind="$(git rev-list --count "$upref" ${mbase:+--not $mbase})" || behind=0
1447                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart ["
1448                                 [ "$ahead" = "0" ] || uprefpart="${uprefpart}ahead $ahead"
1449                                 [ "$ahead" = "0" ] || [ "$behind" = "0" ] || uprefpart="$uprefpart, "
1450                                 [ "$behind" = "0" ] || uprefpart="${uprefpart}behind $behind"
1451                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart]"
1452                         fi
1453                 fi
1454                 echol "${pfx}HEAD -> ${symref#$abbrev/heads/} [${headrv:-unborn}]$uprefpart"
1455         else
1456                 echol "${pfx}HEAD -> ${headrv:-?}"
1457         fi
1458         if [ -n "$tg_state" ]; then
1459                 extra=
1460                 if [ "$tg_state" = "update" ]; then
1461                         IFS= read -r uname <"$git_dir/tg-update/name" || :
1462                         [ -z "$uname" ] ||
1463                         extra="; currently updating branch '$uname'"
1464                 fi
1465                 echol "${pfx}tg $tg_state in progress$extra"
1466                 if [ -s "$git_dir/tg-update/fullcmd" ] && [ -s "$git_dir/tg-update/names" ]; then
1467                         printf "${pfx}You are currently updating as a result of:\n${pfx}  "
1468                         cat "$git_dir/tg-update/fullcmd"
1469                         bcnt="$(( $(wc -w < "$git_dir/tg-update/names") ))"
1470                         if [ $bcnt -gt 1 ]; then
1471                                 pcnt=0
1472                                 ! [ -s "$git_dir/tg-update/processed" ] ||
1473                                 pcnt="$(( $(wc -w < "$git_dir/tg-update/processed") ))"
1474                                 echo "${pfx}$pcnt of $bcnt branches updated so far"
1475                         fi
1476                 fi
1477                 if [ "$tg_state" = "update" ]; then
1478                         echol "${pfx}  (use \"$tgdisplayac update --continue\" to continue)"
1479                         echol "${pfx}  (use \"$tgdisplayac update --skip\" to skip this branch and continue)"
1480                         echol "${pfx}  (use \"$tgdisplayac update --stop\" to stop and retain changes so far)"
1481                         echol "${pfx}  (use \"$tgdisplayac update --abort\" to restore pre-update state)"
1482                 fi
1483         fi
1484         [ -z "$git_state" ] || echo "${pfx}git $git_state in progress"
1485         if [ "$git_state" = "merge" ]; then
1486                 ucnt="$(( $(git ls-files --unmerged --full-name --abbrev :/ | wc -l) ))"
1487                 if [ $ucnt -gt 0 ]; then
1488                         echo "${pfx}"'fix conflicts and then "git commit" the result'
1489                 else
1490                         echo "${pfx}"'all conflicts fixed; run "git commit" to record result'
1491                 fi
1492         fi
1493         if [ -z "$git_state" ]; then
1494                 gsp="$(git status --porcelain 2>/dev/null)" || return 0 # bare repository
1495                 gspcnt=0
1496                 [ -z "$gsp" ] ||
1497                 gspcnt="$(( $(printf '%s\n' "$gsp" | sed -n '/^??/!p' | wc -l) ))"
1498                 untr=
1499                 if [ "$gspcnt" -eq 0 ]; then
1500                         [ -z "$gsp" ] || untr="; non-ignored, untracked files present"
1501                         echo "${pfx}working directory is clean$untr"
1502                         [ -n "$tg_state" ] || do_status_result=0
1503                 else
1504                         echo "${pfx}working directory is DIRTY"
1505                         [ -z "$do_status_verbose" ] || git status --short --untracked-files=no
1506                 fi
1507         fi
1508 }
1509
1510 ## Pager stuff
1511
1512 # isatty FD
1513 isatty()
1514 {
1515         test -t $1
1516 }
1517
1518 # pass "diff" to get pager.diff
1519 # if pager.$1 is a boolean false returns cat
1520 # if set to true or unset fails
1521 # otherwise succeeds and returns the value
1522 get_pager()
1523 {
1524         if _x="$(git config --bool "pager.$1" 2>/dev/null)"; then
1525                 [ "$_x" != "true" ] || return 1
1526                 echo "cat"
1527                 return 0
1528         fi
1529         if _x="$(git config "pager.$1" 2>/dev/null)"; then
1530                 echol "$_x"
1531                 return 0
1532         fi
1533         return 1
1534 }
1535
1536 # setup_pager
1537 # Set TG_PAGER to a valid executable
1538 # After calling, code to be paged should be surrounded with {...} | eval "$TG_PAGER"
1539 # See also the following "page" function for ease of use
1540 # emptypager will be set to 1 (otherwise empty) if TG_PAGER was set to "cat" to not be empty
1541 # Preference is (same as Git):
1542 #   1. GIT_PAGER
1543 #   2. pager.$USE_PAGER_TYPE (but only if USE_PAGER_TYPE is set and so is pager.$USE_PAGER_TYPE)
1544 #   3. core.pager (only if set)
1545 #   4. PAGER
1546 #   5. git var GIT_PAGER
1547 #   6. less
1548 setup_pager()
1549 {
1550         isatty 1 || { emptypager=1; TG_PAGER=cat; return 0; }
1551
1552         emptypager=
1553         if [ -z "$TG_PAGER_IN_USE" ]; then
1554                 # TG_PAGER = GIT_PAGER | PAGER | less
1555                 # NOTE: GIT_PAGER='' is significant
1556                 if [ -n "${GIT_PAGER+set}" ]; then
1557                         TG_PAGER="$GIT_PAGER"
1558                 elif [ -n "$USE_PAGER_TYPE" ] && _dp="$(get_pager "$USE_PAGER_TYPE")"; then
1559                         TG_PAGER="$_dp"
1560                 elif _cp="$(git config core.pager 2>/dev/null)"; then
1561                         TG_PAGER="$_cp"
1562                 elif [ -n "${PAGER+set}" ]; then
1563                         TG_PAGER="$PAGER"
1564                 else
1565                         _gp="$(git var GIT_PAGER 2>/dev/null)" || :
1566                         [ "$_gp" != ":" ] || _gp=
1567                         TG_PAGER="${_gp:-less}"
1568                 fi
1569                 if [ -z "$TG_PAGER" ]; then
1570                         emptypager=1
1571                         TG_PAGER=cat
1572                 fi
1573         else
1574                 emptypager=1
1575                 TG_PAGER=cat
1576         fi
1577
1578         # Set pager default environment variables
1579         # see pager.c:setup_pager
1580         if [ -z "${LESS+set}" ]; then
1581                 LESS="-FRX"
1582                 export LESS
1583         fi
1584         if [ -z "${LV+set}" ]; then
1585                 LV="-c"
1586                 export LV
1587         fi
1588
1589         # this is needed so e.g. $(git diff) will still colorize it's output if
1590         # requested in ~/.gitconfig with color.diff=auto
1591         GIT_PAGER_IN_USE=1
1592         export GIT_PAGER_IN_USE
1593
1594         # this is needed so we don't get nested pagers
1595         TG_PAGER_IN_USE=1
1596         export TG_PAGER_IN_USE
1597 }
1598
1599 # page eval_arg [arg ...]
1600 #
1601 # Calls setup_pager then evals the first argument passing it all the rest
1602 # where the output is piped through eval "$TG_PAGER" unless emptypager is set
1603 # by setup_pager (in which case the output is left as-is).
1604 #
1605 # To handle arbitrary paging duties, collect lines to be paged into a
1606 # function and then call page with the function name or perhaps func_name "$@".
1607 #
1608 # If no arguments at all are passed in do nothing (return with success).
1609 page()
1610 {
1611         [ $# -gt 0 ] || return 0
1612         setup_pager
1613         _evalarg="$1"; shift
1614         if [ -n "$emptypager" ]; then
1615                 eval "$_evalarg" '"$@"'
1616         else
1617                 { eval "$_evalarg" '"$@"';} | eval "$TG_PAGER"
1618         fi
1619 }
1620
1621 # get_temp NAME [-d]
1622 # creates a new temporary file (or directory with -d) in the global
1623 # temporary directory $tg_tmp_dir with pattern prefix NAME
1624 get_temp()
1625 {
1626         mktemp $2 "$tg_tmp_dir/$1.XXXXXX"
1627 }
1628
1629 # automatically called by strftime
1630 # does nothing if already setup
1631 # may be called explicitly if the first call would otherwise be in a subshell
1632 # so that the setup is only done once before subshells start being spawned
1633 setup_strftime()
1634 {
1635         [ -z "$strftime_is_setup" ] || return 0
1636
1637         # date option to format raw epoch seconds values
1638         daterawopt=
1639         _testes='951807788'
1640         _testdt='2000-02-29 07:03:08 UTC'
1641         _testfm='%Y-%m-%d %H:%M:%S %Z'
1642         if [ "$(TZ=UTC date "-d@$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1643                 daterawopt='-d@'
1644         elif [ "$(TZ=UTC date "-r$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1645                 daterawopt='-r'
1646         fi
1647         strftime_is_setup=1
1648 }
1649
1650 # $1 => strftime format string to use
1651 # $2 => raw timestamp as seconds since epoch
1652 # $3 => optional time zone string (empty/absent for local time zone)
1653 strftime()
1654 {
1655         setup_strftime
1656         if [ -n "$daterawopt" ]; then
1657                 if [ -n "$3" ]; then
1658                         TZ="$3" date "$daterawopt$2" "+$1"
1659                 else
1660                         date "$daterawopt$2" "+$1"
1661                 fi
1662         else
1663                 if [ -n "$3" ]; then
1664                         TZ="$3" perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1665                 else
1666                         perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1667                 fi
1668         fi
1669 }
1670
1671 got_cdup_result=
1672 git_cdup_result=
1673 v_get_show_cdup()
1674 {
1675         if [ -z "$got_cdup_result" ]; then
1676                 git_cdup_result="$(git rev-parse --show-cdup)"
1677                 got_cdup_result=1
1678         fi
1679         [ -z "$1" ] || eval "$1="'"$git_cdup_result"'
1680 }
1681
1682 setup_git_dirs()
1683 {
1684         [ -n "$git_dir" ] || git_dir="$(git rev-parse --git-dir)"
1685         if [ -n "$git_dir" ] && [ -d "$git_dir" ]; then
1686                 git_dir="$(cd "$git_dir" && pwd)"
1687         fi
1688         if [ -z "$git_common_dir" ]; then
1689                 if vcmp "$git_version" '>=' "2.5"; then
1690                         # rev-parse --git-common-dir is broken and may give
1691                         # an incorrect result unless the current directory is
1692                         # already set to the top level directory
1693                         v_get_show_cdup
1694                         git_common_dir="$(cd "./$git_cdup_result" && cd "$(git rev-parse --git-common-dir)" && pwd)"
1695                 else
1696                         git_common_dir="$git_dir"
1697                 fi
1698         fi
1699         [ -n "$git_dir" ] && [ -n "$git_common_dir" ] &&
1700         [ -d "$git_dir" ] && [ -d "$git_common_dir" ] || die "Not a git repository"
1701         git_hooks_dir="$git_common_dir/hooks"
1702         if vcmp "$git_version" '>=' "2.9" && gchp="$(git config --path --get core.hooksPath 2>/dev/null)" && [ -n "$gchp" ]; then
1703                 case "$gchp" in
1704                         /[!/]*)
1705                                 git_hooks_dir="$gchp"
1706                                 ;;
1707                         *)
1708                                 [ -n "$1" ] || warn "ignoring non-absolute core.hooksPath: $gchp"
1709                                 ;;
1710                 esac
1711                 unset gchp
1712         fi
1713 }
1714
1715 basic_setup()
1716 {
1717         setup_git_dirs $1
1718         if [ -z "$base_remote" ]; then
1719                 if [ "${TG_EXPLICIT_REMOTE+set}" = "set" ]; then
1720                         base_remote="$TG_EXPLICIT_REMOTE"
1721                 else
1722                         base_remote="$(git config topgit.remote 2>/dev/null)" || :
1723                 fi
1724         fi
1725         tgsequester="$(git config --bool topgit.sequester 2>/dev/null)" || :
1726         tgnosequester=
1727         [ "$tgsequester" != "false" ] || tgnosequester=1
1728         unset tgsequester
1729
1730         # catch errors if topbases is used without being set
1731         unset tg_topbases_set
1732         topbases="programmer*:error"
1733         topbasesrx="programmer*:error}"
1734         oldbases="$topbases"
1735 }
1736
1737 ## Initial setup
1738 initial_setup()
1739 {
1740         # suppress the merge log editor feature since git 1.7.10
1741
1742         GIT_MERGE_AUTOEDIT=no
1743         export GIT_MERGE_AUTOEDIT
1744
1745         basic_setup $1
1746         iowopt=
1747         ! vcmp "$git_version" '>=' "2.5" || iowopt="--ignore-other-worktrees"
1748         gcfbopt=
1749         ! vcmp "$git_version" '>=' "2.6" || gcfbopt="--buffer"
1750         auhopt=
1751         ! vcmp "$git_version" '>=' "2.9" || auhopt="--allow-unrelated-histories"
1752         v_get_show_cdup root_dir
1753         root_dir="${root_dir:-.}"
1754         logrefupdates="$(git config --bool core.logallrefupdates 2>/dev/null)" || :
1755         [ "$logrefupdates" = "true" ] || logrefupdates=
1756
1757         # make sure root_dir doesn't end with a trailing slash.
1758
1759         root_dir="${root_dir%/}"
1760
1761         # create global temporary directories, inside GIT_DIR
1762
1763         tg_tmp_dir=
1764         trap 'rm -rf "$tg_tmp_dir"' EXIT
1765         trap 'exit 129' HUP
1766         trap 'exit 130' INT
1767         trap 'exit 131' QUIT
1768         trap 'exit 134' ABRT
1769         trap 'exit 143' TERM
1770         tg_tmp_dir="$(mktemp -d "$git_dir/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1771         [ -n "$tg_tmp_dir" ] || tg_tmp_dir="$(mktemp -d "${TMPDIR:-/tmp}/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1772         [ -n "$tg_tmp_dir" ] || [ -z "$TMPDIR" ] || tg_tmp_dir="$(mktemp -d "/tmp/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1773         tg_ref_cache="$tg_tmp_dir/tg~ref-cache"
1774         tg_ref_cache_br="$tg_ref_cache.br"
1775         tg_ref_cache_rbr="$tg_ref_cache.rbr"
1776         tg_ref_cache_ann="$tg_ref_cache.ann"
1777         tg_ref_cache_dep="$tg_ref_cache.dep"
1778         [ -n "$tg_tmp_dir" ] && [ -w "$tg_tmp_dir" ] && { >"$tg_ref_cache"; } >/dev/null 2>&1 ||
1779                 die "could not create a writable temporary directory"
1780
1781         # make sure global cache directory exists inside GIT_DIR or $tg_tmp_dir
1782
1783         user_id_no="$(id -u)" || :
1784         : "${user_id_no:=_99_}"
1785         tg_cache_dir="$git_common_dir/tg-cache"
1786         [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1787         [ -z "$tg_cache_dir" ] || tg_cache_dir="$tg_cache_dir/$user_id_no"
1788         [ -z "$tg_cache_dir" ] || [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1789         [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
1790         if [ -z "$tg_cache_dir" ]; then
1791                 tg_cache_dir="$tg_tmp_dir/tg-cache"
1792                 [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1793                 [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
1794         fi
1795         [ -n "$tg_cache_dir" ] ||
1796                 die "could not create a writable tg-cache directory (even a temporary one)"
1797
1798         # GIT_ALTERNATE_OBJECT_DIRECTORIES can contain double-quoted entries
1799         # since Git v2.11.1; however, it's only necessary for : (or perhaps ;)
1800         # so we avoid it if possible and require v2.11.1 to do it at all
1801         # otherwise just don't make an alternates temporary store in that case;
1802         # it's okay to not have one; everything will still work; the nicety of
1803         # making the temporary tree objects vanish when tg exits just won't
1804         # happen in that case but nothing will break also be sure to reuse
1805         # the parent's if we've been recursively invoked and it's for the
1806         # same repository we were invoked on
1807
1808         tg_use_alt_odb=1
1809         _odbdir="${GIT_OBJECT_DIRECTORY:-$git_common_dir/objects}"
1810         [ -n "$_odbdir" ] && [ -d "$_odbdir" ] || tg_use_alt_odb=
1811         _fulltmpdir=
1812         [ -z "$tg_use_alt_odb" ] || _fulltmpdir="$(cd "$tg_tmp_dir" && pwd -P)"
1813         case "$_fulltmpdir" in *[";:"]*) vcmp "$git_version" '>=' "2.11.1" || tg_use_alt_odb=; esac
1814         _fullodbdir=
1815         [ -z "$tg_use_alt_odb" ] || _fullodbdir="$(cd "$_odbdir" && pwd -P)"
1816         if [ -n "$tg_use_alt_odb" ] && [ -n "$TG_OBJECT_DIRECTORY" ] && [ -d "$TG_OBJECT_DIRECTORY/info" ] &&
1817            [ -f "$TG_OBJECT_DIRECTORY/info/alternates" ] && [ -r "$TG_OBJECT_DIRECTORY/info/alternates" ]; then
1818                 if IFS= read -r _otherodbdir <"$TG_OBJECT_DIRECTORY/info/alternates" &&
1819                    [ -n "$_otherodbdir" ] && [ "$_otherodbdir" = "$_fullodbdir" ]; then
1820                         tg_use_alt_odb=2
1821                 fi
1822         fi
1823         if [ "$tg_use_alt_odb" = "1" ]; then
1824                 # create an alternate objects database to keep the ephemeral objects in
1825                 mkdir -p "$tg_tmp_dir/objects/info"
1826                 echol "$_fullodbdir" >"$tg_tmp_dir/objects/info/alternates"
1827                 TG_OBJECT_DIRECTORY="$_fulltmpdir/objects"
1828                 case "$TG_OBJECT_DIRECTORY" in
1829                         *[";:"]*)
1830                                 # surround in "..." and backslash-escape internal '"' and '\\'
1831                                 _altodbdq="\"$(printf '%s\n' "$TG_OBJECT_DIRECTORY" |
1832                                         sed 's/\([""\\]\)/\\\1/g')\""
1833                                 ;;
1834                         *)
1835                                 _altodbdq="$TG_OBJECT_DIRECTORY"
1836                                 ;;
1837                 esac
1838                 TG_PRESERVED_ALTERNATES="$GIT_ALTERNATE_OBJECT_DIRECTORIES"
1839                 if [ -n "$GIT_ALTERNATE_OBJECT_DIRECTORIES" ]; then
1840                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq:$GIT_ALTERNATE_OBJECT_DIRECTORIES"
1841                 else
1842                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq"
1843                 fi
1844                 export TG_PRESERVED_ALTERNATES TG_OBJECT_DIRECTORY GIT_ALTERNATE_OBJECT_DIRECTORIES GIT_OBJECT_DIRECTORY
1845         fi
1846 }
1847
1848 set_topbases()
1849 {
1850         # refer to "top-bases" in a refname with $topbases
1851
1852         [ -z "$tg_topbases_set" ] || return 0
1853
1854         topbases_implicit_default=1
1855         # See if topgit.top-bases is set to heads or refs
1856         tgtb="$(git config "topgit.top-bases" 2>/dev/null)" || :
1857         if [ -n "$tgtb" ] && [ "$tgtb" != "heads" ] && [ "$tgtb" != "refs" ]; then
1858                 if [ -n "$1" ]; then
1859                         # never die on the hook script
1860                         unset tgtb
1861                 else
1862                         die "invalid \"topgit.top-bases\" setting (must be \"heads\" or \"refs\")"
1863                 fi
1864         fi
1865         if [ -n "$tgtb" ]; then
1866                 case "$tgtb" in
1867                 heads)
1868                         topbases="heads/{top-bases}"
1869                         topbasesrx="heads/[{]top-bases[}]"
1870                         oldbases="top-bases";;
1871                 refs)
1872                         topbases="top-bases"
1873                         topbasesrx="top-bases"
1874                         oldbases="heads/{top-bases}";;
1875                 esac
1876                 # MUST NOT be exported
1877                 unset tgtb tg_topbases_set topbases_implicit_default
1878                 tg_topbases_set=1
1879                 return 0
1880         fi
1881         unset tgtb
1882
1883         # check heads and top-bases and see what state the current
1884         # repository is in.  remotes are ignored.
1885
1886         rc=0 activebases=
1887         activebases="$(
1888                 git for-each-ref --format='%(refname)' "refs/heads" "refs/top-bases" 2>/dev/null |
1889                 run_awk_ref_prefixes ${1:+-e} -n -- "refs/heads/{top-bases}" "refs/top-bases" "refs/heads")" ||
1890                 rc=$?
1891         if [ "$rc" = "65" ]; then
1892                 # Complain and die
1893                 err "repository contains existing TopGit branches"
1894                 err "but some use refs/top-bases/... for the base"
1895                 err "and some use refs/heads/{top-bases}/... for the base"
1896                 err "with the latter being the new, preferred location"
1897                 err "set \"topgit.top-bases\" to either \"heads\" to use"
1898                 err "the new heads/{top-bases} location or \"refs\" to use"
1899                 err "the old top-bases location."
1900                 err "(the tg migrate-bases command can also resolve this issue)"
1901                 die "schizophrenic repository requires topgit.top-bases setting"
1902         fi
1903         [ -z "$activebases" ] || unset topbases_implicit_default
1904         if [ "$activebases" = "refs/heads/{top-bases}" ]; then
1905                 topbases="heads/{top-bases}"
1906                 topbasesrx="heads/[{]top-bases[}]"
1907                 oldbases="top-bases"
1908         else
1909                 # default is still top-bases for now
1910                 topbases="top-bases"
1911                 topbasesrx="top-bases"
1912                 oldbases="heads/{top-bases}"
1913         fi
1914         # MUST NOT be exported
1915         unset rc activebases tg_topases_set
1916         tg_topbases_set=1
1917         return 0
1918 }
1919
1920 # init_reflog "ref"
1921 # if "$logrefupdates" is set and ref is not under refs/heads/ then force
1922 # an empty log file to exist so that ref changes will be logged
1923 # "$1" must be a fully-qualified refname (i.e. start with "refs/")
1924 # However, if "$1" is "refs/tgstash" then always make the reflog
1925 # The only ref not under refs/ that Git will write a reflog for is HEAD;
1926 # no matter what, it will NOT update a reflog for any other bare refs so
1927 # just quietly succeed when passed TG_STASH without doing anything.
1928 init_reflog()
1929 {
1930         [ -n "$1" ] && [ "$1" != "TG_STASH" ] || return 0
1931         [ -n "$logrefupdates" ] || [ "$1" = "refs/tgstash" ] || return 0
1932         case "$1" in refs/heads/*|HEAD) return 0;; refs/*[!/]);; *) return 1; esac
1933         mkdir -p "$git_common_dir/logs/${1%/*}" 2>/dev/null || :
1934         { >>"$git_common_dir/logs/$1" || :; } 2>/dev/null
1935  }
1936
1937 # store the "realpath" for "$2" in "$1" except the leaf is not resolved if it's
1938 # a symbolic link.  The directory part must exist, but the basename need not.
1939 v_get_abs_path()
1940 {
1941         [ -n "$1" ] && [ -n "$2" ] || return 1
1942         set -- "$1" "$2" "${2%/}"
1943         case "$3" in
1944                 */*) set -- "$1" "$2" "${3%/*}";;
1945                 *  ) set -- "$1" "$2" ".";;
1946         esac
1947         case "$2" in */)
1948                 set -- "$1" "${2%/}" "$3" "/"
1949         esac
1950         [ -d "$3" ] || return 1
1951         eval "$1="'"$(cd "$3" && pwd -P)/${2##*/}$4"'
1952 }
1953
1954 ## Startup
1955
1956 : "${TG_INST_CMDDIR:=@cmddir@}"
1957 : "${TG_INST_SHAREDIR:=@sharedir@}"
1958 : "${TG_INST_HOOKSDIR:=@hooksdir@}"
1959
1960 [ -d "$TG_INST_CMDDIR" ] ||
1961         die "No command directory: '$TG_INST_CMDDIR'"
1962
1963 ## Include awk scripts and their utility functions (separated for easier debugging)
1964
1965 [ -f "$TG_INST_CMDDIR/tg--awksome" ] && [ -r "$TG_INST_CMDDIR/tg--awksome" ] ||
1966         die "Missing awk scripts: '$TG_INST_CMDDIR/tg--awksome'"
1967 . "$TG_INST_CMDDIR/tg--awksome"
1968
1969 if [ -n "$tg__include" ]; then
1970
1971         # We were sourced from another script for our utility functions;
1972         # this is set by hooks.  Skip the rest of the file.  A simple return doesn't
1973         # work as expected in every shell.  See http://bugs.debian.org/516188
1974
1975         # ensure setup happens
1976
1977         initial_setup 1
1978         set_topbases 1
1979
1980 else
1981
1982         set -e
1983
1984         tgbin="$0"
1985         tgdir="${tgbin%/}"
1986         case "$tgdir" in */*);;*) tgdir="./$tgdir"; esac
1987         tgdir="${tgdir%/*}/"
1988         tgname="${tgbin##*/}"
1989         [ "$0" != "$tgname" ] || tgdir=""
1990
1991         # If tg contains a '/' but does not start with one then replace it with an absolute path
1992
1993         case "$0" in /*) ;; */*)
1994                 tgdir="$(cd "${0%/*}" && pwd -P)/"
1995                 tgbin="$tgdir$tgname"
1996         esac
1997
1998         # tgdisplay will include any explicit -C <dir> etc. options whereas tgname will not
1999         # tgdisplayac is the same as tgdisplay but without any -r or -u options (ac => abort/continue)
2000
2001         tgdisplaydir="$tgdir"
2002         tgdisplay="$tgbin"
2003         tgdisplayac="$tgdisplay"
2004         if
2005             v_get_abs_path _tgnameabs "$(cmd_path "$tgname")" &&
2006             _tgabs="$_tgnameabs" &&
2007             { [ "$tgbin" = "$tgname" ] || v_get_abs_path _tgabs "$tgbin"; } &&
2008             [ "$_tgabs" = "$_tgnameabs" ]
2009         then
2010                 tgdisplaydir=""
2011                 tgdisplay="$tgname"
2012                 tgdisplayac="$tgdisplay"
2013         fi
2014         [ -z "$_tgabs" ] || tgbin="$_tgabs"
2015         unset _tgabs _tgnameabs
2016
2017         tg() { command "$tgbin" "$@"; }
2018
2019         explicit_remote=
2020         explicit_dir=
2021         gitcdopt=
2022         noremote=
2023
2024         cmd=
2025         while :; do case "$1" in
2026
2027                 help|--help|-h)
2028                         cmd=help
2029                         shift
2030                         break;;
2031
2032                 status|--status)
2033                         cmd=status
2034                         shift
2035                         break;;
2036
2037                 --hooks-path)
2038                         cmd=hooks-path
2039                         shift
2040                         break;;
2041
2042                 --exec-path)
2043                         cmd=exec-path
2044                         shift
2045                         break;;
2046
2047                 --top-bases)
2048                         cmd=top-bases
2049                         shift
2050                         break;;
2051
2052                 --no-pager)
2053                         GIT_PAGER_IN_USE=1 TG_PAGER_IN_USE=1 &&
2054                         export GIT_PAGER_IN_USE TG_PAGER_IN_USE
2055                         shift;;
2056
2057                 -r)
2058                         shift
2059                         if [ -z "$1" ]; then
2060                                 echo "Option -r requires an argument." >&2
2061                                 do_help
2062                                 exit 1
2063                         fi
2064                         unset noremote
2065                         base_remote="$1"
2066                         explicit_remote="$base_remote"
2067                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -r $explicit_remote"
2068                         TG_EXPLICIT_REMOTE="$base_remote" && export TG_EXPLICIT_REMOTE
2069                         shift;;
2070
2071                 -u)
2072                         unset base_remote explicit_remote
2073                         noremote=1
2074                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -u"
2075                         TG_EXPLICIT_REMOTE= && export TG_EXPLICIT_REMOTE
2076                         shift;;
2077
2078                 -C)
2079                         shift
2080                         if [ -z "$1" ]; then
2081                                 echo "Option -C requires an argument." >&2
2082                                 do_help
2083                                 exit 1
2084                         fi
2085                         cd "$1"
2086                         unset GIT_DIR GIT_COMMON_DIR
2087                         if [ -z "$explicit_dir" ]; then
2088                                 explicit_dir="$1"
2089                         else
2090                                 explicit_dir="$PWD"
2091                         fi
2092                         gitcdopt=" -C \"$explicit_dir\""
2093                         [ "$explicit_dir" != "." ] || explicit_dir="." gitcdopt=" -C ."
2094                         tgdisplay="$tgdisplaydir$tgname$gitcdopt"
2095                         tgdisplayac="$tgdisplay"
2096                         [ -z "$explicit_remote" ] || tgdisplay="$tgdisplay -r $explicit_remote"
2097                         [ -z "$noremote" ] || tgdisplay="$tgdisplay -u"
2098                         shift;;
2099
2100                 -c)
2101                         shift
2102                         if [ -z "$1" ]; then
2103                                 echo "Option -c requires an argument." >&2
2104                                 do_help
2105                                 exit 1
2106                         fi
2107                         param="'$(printf '%s\n' "$1" | sed "s/[']/'\\\\''/g")'"
2108                         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }$param"
2109                         export GIT_CONFIG_PARAMETERS
2110                         shift;;
2111
2112                 --)
2113                         shift
2114                         break;;
2115
2116                 -*)
2117                         echo "Invalid option $1 (subcommand options must appear AFTER the subcommand)." >&2
2118                         do_help
2119                         exit 1;;
2120
2121                 *)
2122                         break;;
2123
2124         esac; done
2125
2126         [ -n "$cmd" -o $# -lt 1 ] || { cmd="$1"; shift; }
2127
2128         ## Dispatch
2129
2130         [ -n "$cmd" ] || { do_help; exit 1; }
2131
2132         case "$cmd" in
2133
2134                 help)
2135                         do_help "$@"
2136                         exit 0;;
2137
2138                 status|st)
2139                         unset base_remote
2140                         basic_setup
2141                         set_topbases
2142                         do_status "$@"
2143                         exit ${do_status_result:-0};;
2144
2145                 hooks-path)
2146                         # Internal command
2147                         echol "$TG_INST_HOOKSDIR";;
2148
2149                 exec-path)
2150                         # Internal command
2151                         echol "$TG_INST_CMDDIR";;
2152
2153                 top-bases)
2154                         # Maintenance command
2155                         ! git rev-parse --git-dir >/dev/null 2>&1 || setup_git_dirs
2156                         set_topbases
2157                         echol "refs/$topbases";;
2158
2159                 *)
2160                         isutil=
2161                         case "$cmd" in index-merge-one-file)
2162                                 isutil="-"
2163                         esac
2164                         [ -r "$TG_INST_CMDDIR"/tg-$isutil$cmd ] || {
2165                                 looplevel="$TG_ALIAS_DEPTH"
2166                                 [ "${looplevel#[1-9]}" != "$looplevel" ] &&
2167                                 [ "${looplevel%%[!0-9]*}" = "$looplevel" ] ||
2168                                 looplevel=0
2169                                 tgalias="$(git config "topgit.alias.$cmd" 2>/dev/null)" || :
2170                                 [ -n "$tgalias" ] || {
2171                                         echo "Unknown subcommand: $cmd" >&2
2172                                         do_help
2173                                         exit 1
2174                                 }
2175                                 looplevel=$(( $looplevel + 1 ))
2176                                 [ $looplevel -le 10 ] || die "topgit.alias nesting level 10 exceeded"
2177                                 TG_ALIAS_DEPTH="$looplevel"
2178                                 export TG_ALIAS_DEPTH
2179                                 if [ "!${tgalias#?}" = "$tgalias" ]; then
2180                                         unset GIT_PREFIX
2181                                         if pfx="$(git rev-parse --show-prefix 2>/dev/null)"; then
2182                                                 GIT_PREFIX="$pfx"
2183                                                 export GIT_PREFIX
2184                                         fi
2185                                         cd "./$(git rev-parse --show-cdup 2>/dev/null)"
2186                                         exec @SHELL_PATH@ -c "${tgalias#?} \"\$@\"" @SHELL_PATH@ "$@"
2187                                 else
2188                                         eval 'exec "$tgbin"' "$tgalias" '"$@"'
2189                                 fi
2190                                 die "alias execution failed for: $tgalias"
2191                         }
2192                         unset TG_ALIAS_DEPTH
2193
2194                         showing_help=
2195                         if [ "$*" = "-h" ] || [ "$*" = "--help" ]; then
2196                                 showing_help=1
2197                         fi
2198
2199                         [ -n "$showing_help" ] || initial_setup
2200                         [ -z "$noremote" ] || unset base_remote
2201
2202                         nomergesetup="$showing_help"
2203                         case "$cmd" in base|contains|info|log|rebase|revert|summary|tag)
2204                                 # avoid merge setup where not necessary
2205
2206                                 nomergesetup=1
2207                         esac
2208
2209                         if [ -z "$nomergesetup" ]; then
2210                                 # make sure merging the .top* files will always behave sanely
2211
2212                                 setup_ours
2213                                 setup_hook "pre-commit"
2214                         fi
2215
2216                         # everything but rebase needs topbases set
2217                         carefully="$showing_help"
2218                         [ "$cmd" != "migrate-bases" ] || carefully=1
2219                         [ "$cmd" = "rebase" ] || set_topbases $carefully
2220
2221                         _use_ref_cache=
2222                         tg_read_only=1
2223                         case "$cmd$showing_help" in
2224                                 contains|export|info|summary|tag)
2225                                         _use_ref_cache=1;;
2226                                 annihilate|create|delete|depend|import|update)
2227                                         tg_use_alt_odb=
2228                                         tg_read_only=;;
2229                         esac
2230                         [ -z "$_use_ref_cache" ] || v_create_ref_cache
2231
2232                         fullcmd="${tgname:-tg} $cmd $*"
2233                         . "$TG_INST_CMDDIR"/tg-$isutil$cmd;;
2234         esac
2235
2236 fi