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 # list_deps [-i | -w] [BRANCH]
1196 # -i/-w apply only to HEAD
1197 list_deps()
1198 {
1199         head_from=
1200         [ "$1" != "-i" -a "$1" != "-w" ] || { head_from="$1"; shift; }
1201         head="$(git symbolic-ref -q HEAD)" ||
1202                 head="..detached.."
1203
1204         git for-each-ref --format='%(objectname) %(refname)' "refs/$topbases${1:+/$1}" |
1205                 while read rev ref; do
1206                         name="${ref#refs/$topbases/}"
1207                         if branch_annihilated "$name" "" "$rev"; then
1208                                 continue
1209                         fi
1210
1211                         from=$head_from
1212                         [ "refs/heads/$name" = "$head" ] ||
1213                                 from=
1214                         cat_file "refs/heads/$name:.topdeps" $from | while read dep; do
1215                                 dep_is_tgish=true
1216                                 ref_exists "refs/$topbases/$dep" ||
1217                                         dep_is_tgish=false
1218                                 if ! "$dep_is_tgish" || ! branch_annihilated $dep; then
1219                                         echo "$name $dep"
1220                                 fi
1221                         done
1222                 done
1223 }
1224
1225 # checkout_symref_full [-f] FULLREF [SEED]
1226 # Just like git checkout $iowopt -b FULLREF [SEED] except that FULLREF MUST start with
1227 # refs/ and HEAD is ALWAYS set to a symref to it and [SEED] (default is FULLREF)
1228 # MUST be a committish which if present will be used instead of current FULLREF
1229 # (and FULLREF will be updated to it as well in that case)
1230 # Any merge state is always cleared by this function
1231 # With -f it's like git checkout $iowopt -f -b FULLREF (uses read-tree --reset
1232 # instead of -m) but it will clear out any unmerged entries
1233 # As an extension, FULLREF may also be a full hash to create a detached HEAD instead
1234 checkout_symref_full()
1235 {
1236         _mode=-m
1237         _head="HEAD"
1238         if [ "$1" = "-f" ]; then
1239                 _mode="--reset"
1240                 _head=
1241                 shift
1242         fi
1243         _ishash=
1244         case "$1" in
1245                 refs/?*)
1246                         ;;
1247                 $octet20)
1248                         _ishash=1
1249                         [ -z "$2" ] || [ "$1" = "$2" ] ||
1250                                 die "programmer error: invalid checkout_symref_full \"$1\" \"$2\""
1251                         set -- HEAD "$1"
1252                         ;;
1253                 *)
1254                         die "programmer error: invalid checkout_symref_full \"$1\""
1255                         ;;
1256         esac
1257         _seedrev="$(git rev-parse --quiet --verify "${2:-$1}^0" --)" ||
1258                 die "invalid committish: \"${2:-$1}\""
1259         # Clear out any MERGE_HEAD kruft
1260         rm -f "$git_dir/MERGE_HEAD" || :
1261         # We have to do all the hard work ourselves :/
1262         # This is like git checkout -b "$1" "$2"
1263         # (or just git checkout "$1"),
1264         # but never creates a detached HEAD (unless $1 is a hash)
1265         git read-tree -u $_mode $_head "$_seedrev" &&
1266         {
1267                 [ -z "$2" ] && [ "$(git cat-file -t "$1")" = "commit" ] ||
1268                 git update-ref ${_ishash:+--no-deref} "$1" "$_seedrev"
1269         } && {
1270                 [ -n "$_ishash" ] || git symbolic-ref HEAD "$1"
1271         }
1272 }
1273
1274 # switch_to_base NAME [SEED]
1275 switch_to_base()
1276 {
1277         checkout_symref_full "refs/$topbases/$1" "$2"
1278 }
1279
1280 # run editor with arguments
1281 # the editor setting will be cached in $tg_editor (which is eval'd)
1282 # result non-zero if editor fails or GIT_EDITOR cannot be determined
1283 run_editor()
1284 {
1285         tg_editor="$GIT_EDITOR"
1286         [ -n "$tg_editor" ] || tg_editor="$(git var GIT_EDITOR)" || return $?
1287         eval "$tg_editor" '"$@"'
1288 }
1289
1290 # Show the help messages.
1291 do_help()
1292 {
1293         _www=
1294         if [ "$1" = "-w" ]; then
1295                 _www=1
1296                 shift
1297         fi
1298         if [ -z "$1" ] ; then
1299                 # This is currently invoked in all kinds of circumstances,
1300                 # including when the user made a usage error. Should we end up
1301                 # providing more than a short help message, then we should
1302                 # differentiate.
1303                 # Petr's comment: http://marc.info/?l=git&m=122718711327376&w=2
1304
1305                 ## Build available commands list for help output
1306
1307                 cmds=
1308                 sep=
1309                 for cmd in "$TG_INST_CMDDIR"/tg-[!-]*; do
1310                         ! [ -r "$cmd" ] && continue
1311                         # strip directory part and "tg-" prefix
1312                         cmd="${cmd##*/}"
1313                         cmd="${cmd#tg-}"
1314                         [ "$cmd" != "migrate-bases" ] || continue
1315                         [ "$cmd" != "summary" ] || cmd="st[atus]|$cmd"
1316                         cmds="$cmds$sep$cmd"
1317                         sep="|"
1318                 done
1319
1320                 echo "TopGit version $TG_VERSION - A different patch queue manager"
1321                 echo "Usage: $tgname [-C <dir>] [-r <remote> | -u] [-c <name>=<val>] ($cmds) ..."
1322                 echo "   Or: $tgname help [-w] [<command>]"
1323                 echo "Use \"$tgdisplaydir$tgname help tg\" for overview of TopGit"
1324         elif [ -r "$TG_INST_CMDDIR"/tg-$1 -o -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1325                 if [ -n "$_www" ]; then
1326                         nohtml=
1327                         if ! [ -r "$TG_INST_SHAREDIR/topgit.html" ]; then
1328                                 echo "${0##*/}: missing html help file:" \
1329                                         "$TG_INST_SHAREDIR/topgit.html" 1>&2
1330                                 nohtml=1
1331                         fi
1332                         if ! [ -r "$TG_INST_SHAREDIR/tg-$1.html" ]; then
1333                                 echo "${0##*/}: missing html help file:" \
1334                                         "$TG_INST_SHAREDIR/tg-$1.html" 1>&2
1335                                 nohtml=1
1336                         fi
1337                         if [ -n "$nohtml" ]; then
1338                                 echo "${0##*/}: use" \
1339                                         "\"${0##*/} help $1\" instead" 1>&2
1340                                 exit 1
1341                         fi
1342                         git web--browse -c help.browser "$TG_INST_SHAREDIR/tg-$1.html"
1343                         exit
1344                 fi
1345                 output()
1346                 {
1347                         if [ -r "$TG_INST_CMDDIR"/tg-$1 ] ; then
1348                                 "$TG_INST_CMDDIR"/tg-$1 -h 2>&1 || :
1349                                 echo
1350                         elif [ "$1" = "help" ]; then
1351                                 echo "Usage: ${tgname:-tg} help [-w] [<command>]"
1352                                 echo
1353                         elif [ "$1" = "status" ] || [ "$1" = "st" ]; then
1354                                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1355                                 echo
1356                         fi
1357                         if [ -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1358                                 cat "$TG_INST_SHAREDIR/tg-$1.txt"
1359                         fi
1360                 }
1361                 page output "$1"
1362         else
1363                 echo "${0##*/}: no help for $1" 1>&2
1364                 do_help
1365                 exit 1
1366         fi
1367 }
1368
1369 check_status()
1370 {
1371         git_state=
1372         git_remove=
1373         if [ -e "$git_dir/MERGE_HEAD" ]; then
1374                 git_state="merge"
1375         elif [ -e "$git_dir/rebase-apply/applying" ]; then
1376                 git_state="am"
1377                 git_remove="$git_dir/rebase-apply"
1378         elif [ -e "$git_dir/rebase-apply" ]; then
1379                 git_state="rebase"
1380                 git_remove="$git_dir/rebase-apply"
1381         elif [ -e "$git_dir/rebase-merge" ]; then
1382                 git_state="rebase"
1383                 git_remove="$git_dir/rebase-merge"
1384         elif [ -e "$git_dir/CHERRY_PICK_HEAD" ]; then
1385                 git_state="cherry-pick"
1386         elif [ -e "$git_dir/BISECT_LOG" ]; then
1387                 git_state="bisect"
1388         elif [ -e "$git_dir/REVERT_HEAD" ]; then
1389                 git_state="revert"
1390         fi
1391         git_remove="${git_remove#./}"
1392
1393         tg_state=
1394         tg_remove=
1395         tg_topmerge=
1396         if [ -e "$git_dir/tg-update" ]; then
1397                 tg_state="update"
1398                 tg_remove="$git_dir/tg-update"
1399                 ! [ -s "$git_dir/tg-update/merging_topfiles" ] || tg_topmerge=1
1400         fi
1401         tg_remove="${tg_remove#./}"
1402 }
1403
1404 # Show status information
1405 do_status()
1406 {
1407         do_status_result=0
1408         do_status_verbose=
1409         do_status_help=
1410         abbrev=refs
1411         pfx=
1412         while [ $# -gt 0 ] && case "$1" in
1413                 --help|-h)
1414                         do_status_help=1
1415                         break;;
1416                 -vv)
1417                         # kludge in this common bundling option
1418                         abbrev=
1419                         do_status_verbose=1
1420                         pfx="## "
1421                         ;;
1422                 --verbose|-v)
1423                         [ -z "$do_status_verbose" ] || abbrev=
1424                         do_status_verbose=1
1425                         pfx="## "
1426                         ;;
1427                 --exit-code)
1428                         do_status_result=2
1429                         ;;
1430                 *)
1431                         die "unknown status argument: $1"
1432                         ;;
1433         esac; do shift; done
1434         if [ -n "$do_status_help" ]; then
1435                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1436                 return
1437         fi
1438         check_status
1439         symref="$(git symbolic-ref --quiet HEAD)" || :
1440         headrv="$(git rev-parse --quiet --verify ${abbrev:+--short} HEAD --)" || :
1441         if [ -n "$symref" ]; then
1442                 uprefpart=
1443                 if [ -n "$headrv" ]; then
1444                         upref="$(git rev-parse --symbolic-full-name @{upstream} 2>/dev/null)" || :
1445                         if [ -n "$upref" ]; then
1446                                 uprefpart=" ... ${upref#$abbrev/remotes/}"
1447                                 mbase="$(git merge-base HEAD "$upref")" || :
1448                                 ahead="$(git rev-list --count HEAD ${mbase:+--not $mbase})" || ahead=0
1449                                 behind="$(git rev-list --count "$upref" ${mbase:+--not $mbase})" || behind=0
1450                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart ["
1451                                 [ "$ahead" = "0" ] || uprefpart="${uprefpart}ahead $ahead"
1452                                 [ "$ahead" = "0" ] || [ "$behind" = "0" ] || uprefpart="$uprefpart, "
1453                                 [ "$behind" = "0" ] || uprefpart="${uprefpart}behind $behind"
1454                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart]"
1455                         fi
1456                 fi
1457                 echol "${pfx}HEAD -> ${symref#$abbrev/heads/} [${headrv:-unborn}]$uprefpart"
1458         else
1459                 echol "${pfx}HEAD -> ${headrv:-?}"
1460         fi
1461         if [ -n "$tg_state" ]; then
1462                 extra=
1463                 if [ "$tg_state" = "update" ]; then
1464                         IFS= read -r uname <"$git_dir/tg-update/name" || :
1465                         [ -z "$uname" ] ||
1466                         extra="; currently updating branch '$uname'"
1467                 fi
1468                 echol "${pfx}tg $tg_state in progress$extra"
1469                 if [ -s "$git_dir/tg-update/fullcmd" ] && [ -s "$git_dir/tg-update/names" ]; then
1470                         printf "${pfx}You are currently updating as a result of:\n${pfx}  "
1471                         cat "$git_dir/tg-update/fullcmd"
1472                         bcnt="$(( $(wc -w < "$git_dir/tg-update/names") ))"
1473                         if [ $bcnt -gt 1 ]; then
1474                                 pcnt=0
1475                                 ! [ -s "$git_dir/tg-update/processed" ] ||
1476                                 pcnt="$(( $(wc -w < "$git_dir/tg-update/processed") ))"
1477                                 echo "${pfx}$pcnt of $bcnt branches updated so far"
1478                         fi
1479                 fi
1480                 if [ "$tg_state" = "update" ]; then
1481                         echol "${pfx}  (use \"$tgdisplayac update --continue\" to continue)"
1482                         echol "${pfx}  (use \"$tgdisplayac update --skip\" to skip this branch and continue)"
1483                         echol "${pfx}  (use \"$tgdisplayac update --stop\" to stop and retain changes so far)"
1484                         echol "${pfx}  (use \"$tgdisplayac update --abort\" to restore pre-update state)"
1485                 fi
1486         fi
1487         [ -z "$git_state" ] || echo "${pfx}git $git_state in progress"
1488         if [ "$git_state" = "merge" ]; then
1489                 ucnt="$(( $(git ls-files --unmerged --full-name --abbrev :/ | wc -l) ))"
1490                 if [ $ucnt -gt 0 ]; then
1491                         echo "${pfx}"'fix conflicts and then "git commit" the result'
1492                 else
1493                         echo "${pfx}"'all conflicts fixed; run "git commit" to record result'
1494                 fi
1495         fi
1496         if [ -z "$git_state" ]; then
1497                 gsp="$(git status --porcelain 2>/dev/null)" || return 0 # bare repository
1498                 gspcnt=0
1499                 [ -z "$gsp" ] ||
1500                 gspcnt="$(( $(printf '%s\n' "$gsp" | sed -n '/^??/!p' | wc -l) ))"
1501                 untr=
1502                 if [ "$gspcnt" -eq 0 ]; then
1503                         [ -z "$gsp" ] || untr="; non-ignored, untracked files present"
1504                         echo "${pfx}working directory is clean$untr"
1505                         [ -n "$tg_state" ] || do_status_result=0
1506                 else
1507                         echo "${pfx}working directory is DIRTY"
1508                         [ -z "$do_status_verbose" ] || git status --short --untracked-files=no
1509                 fi
1510         fi
1511 }
1512
1513 ## Pager stuff
1514
1515 # isatty FD
1516 isatty()
1517 {
1518         test -t $1
1519 }
1520
1521 # pass "diff" to get pager.diff
1522 # if pager.$1 is a boolean false returns cat
1523 # if set to true or unset fails
1524 # otherwise succeeds and returns the value
1525 get_pager()
1526 {
1527         if _x="$(git config --bool "pager.$1" 2>/dev/null)"; then
1528                 [ "$_x" != "true" ] || return 1
1529                 echo "cat"
1530                 return 0
1531         fi
1532         if _x="$(git config "pager.$1" 2>/dev/null)"; then
1533                 echol "$_x"
1534                 return 0
1535         fi
1536         return 1
1537 }
1538
1539 # setup_pager
1540 # Set TG_PAGER to a valid executable
1541 # After calling, code to be paged should be surrounded with {...} | eval "$TG_PAGER"
1542 # See also the following "page" function for ease of use
1543 # emptypager will be set to 1 (otherwise empty) if TG_PAGER was set to "cat" to not be empty
1544 # Preference is (same as Git):
1545 #   1. GIT_PAGER
1546 #   2. pager.$USE_PAGER_TYPE (but only if USE_PAGER_TYPE is set and so is pager.$USE_PAGER_TYPE)
1547 #   3. core.pager (only if set)
1548 #   4. PAGER
1549 #   5. git var GIT_PAGER
1550 #   6. less
1551 setup_pager()
1552 {
1553         isatty 1 || { emptypager=1; TG_PAGER=cat; return 0; }
1554
1555         emptypager=
1556         if [ -z "$TG_PAGER_IN_USE" ]; then
1557                 # TG_PAGER = GIT_PAGER | PAGER | less
1558                 # NOTE: GIT_PAGER='' is significant
1559                 if [ -n "${GIT_PAGER+set}" ]; then
1560                         TG_PAGER="$GIT_PAGER"
1561                 elif [ -n "$USE_PAGER_TYPE" ] && _dp="$(get_pager "$USE_PAGER_TYPE")"; then
1562                         TG_PAGER="$_dp"
1563                 elif _cp="$(git config core.pager 2>/dev/null)"; then
1564                         TG_PAGER="$_cp"
1565                 elif [ -n "${PAGER+set}" ]; then
1566                         TG_PAGER="$PAGER"
1567                 else
1568                         _gp="$(git var GIT_PAGER 2>/dev/null)" || :
1569                         [ "$_gp" != ":" ] || _gp=
1570                         TG_PAGER="${_gp:-less}"
1571                 fi
1572                 if [ -z "$TG_PAGER" ]; then
1573                         emptypager=1
1574                         TG_PAGER=cat
1575                 fi
1576         else
1577                 emptypager=1
1578                 TG_PAGER=cat
1579         fi
1580
1581         # Set pager default environment variables
1582         # see pager.c:setup_pager
1583         if [ -z "${LESS+set}" ]; then
1584                 LESS="-FRX"
1585                 export LESS
1586         fi
1587         if [ -z "${LV+set}" ]; then
1588                 LV="-c"
1589                 export LV
1590         fi
1591
1592         # this is needed so e.g. $(git diff) will still colorize it's output if
1593         # requested in ~/.gitconfig with color.diff=auto
1594         GIT_PAGER_IN_USE=1
1595         export GIT_PAGER_IN_USE
1596
1597         # this is needed so we don't get nested pagers
1598         TG_PAGER_IN_USE=1
1599         export TG_PAGER_IN_USE
1600 }
1601
1602 # page eval_arg [arg ...]
1603 #
1604 # Calls setup_pager then evals the first argument passing it all the rest
1605 # where the output is piped through eval "$TG_PAGER" unless emptypager is set
1606 # by setup_pager (in which case the output is left as-is).
1607 #
1608 # To handle arbitrary paging duties, collect lines to be paged into a
1609 # function and then call page with the function name or perhaps func_name "$@".
1610 #
1611 # If no arguments at all are passed in do nothing (return with success).
1612 page()
1613 {
1614         [ $# -gt 0 ] || return 0
1615         setup_pager
1616         _evalarg="$1"; shift
1617         if [ -n "$emptypager" ]; then
1618                 eval "$_evalarg" '"$@"'
1619         else
1620                 { eval "$_evalarg" '"$@"';} | eval "$TG_PAGER"
1621         fi
1622 }
1623
1624 # get_temp NAME [-d]
1625 # creates a new temporary file (or directory with -d) in the global
1626 # temporary directory $tg_tmp_dir with pattern prefix NAME
1627 get_temp()
1628 {
1629         mktemp $2 "$tg_tmp_dir/$1.XXXXXX"
1630 }
1631
1632 # automatically called by strftime
1633 # does nothing if already setup
1634 # may be called explicitly if the first call would otherwise be in a subshell
1635 # so that the setup is only done once before subshells start being spawned
1636 setup_strftime()
1637 {
1638         [ -z "$strftime_is_setup" ] || return 0
1639
1640         # date option to format raw epoch seconds values
1641         daterawopt=
1642         _testes='951807788'
1643         _testdt='2000-02-29 07:03:08 UTC'
1644         _testfm='%Y-%m-%d %H:%M:%S %Z'
1645         if [ "$(TZ=UTC date "-d@$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1646                 daterawopt='-d@'
1647         elif [ "$(TZ=UTC date "-r$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1648                 daterawopt='-r'
1649         fi
1650         strftime_is_setup=1
1651 }
1652
1653 # $1 => strftime format string to use
1654 # $2 => raw timestamp as seconds since epoch
1655 # $3 => optional time zone string (empty/absent for local time zone)
1656 strftime()
1657 {
1658         setup_strftime
1659         if [ -n "$daterawopt" ]; then
1660                 if [ -n "$3" ]; then
1661                         TZ="$3" date "$daterawopt$2" "+$1"
1662                 else
1663                         date "$daterawopt$2" "+$1"
1664                 fi
1665         else
1666                 if [ -n "$3" ]; then
1667                         TZ="$3" perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1668                 else
1669                         perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1670                 fi
1671         fi
1672 }
1673
1674 got_cdup_result=
1675 git_cdup_result=
1676 v_get_show_cdup()
1677 {
1678         if [ -z "$got_cdup_result" ]; then
1679                 git_cdup_result="$(git rev-parse --show-cdup)"
1680                 got_cdup_result=1
1681         fi
1682         [ -z "$1" ] || eval "$1="'"$git_cdup_result"'
1683 }
1684
1685 setup_git_dirs()
1686 {
1687         [ -n "$git_dir" ] || git_dir="$(git rev-parse --git-dir)"
1688         if [ -n "$git_dir" ] && [ -d "$git_dir" ]; then
1689                 git_dir="$(cd "$git_dir" && pwd)"
1690         fi
1691         if [ -z "$git_common_dir" ]; then
1692                 if vcmp "$git_version" '>=' "2.5"; then
1693                         # rev-parse --git-common-dir is broken and may give
1694                         # an incorrect result unless the current directory is
1695                         # already set to the top level directory
1696                         v_get_show_cdup
1697                         git_common_dir="$(cd "./$git_cdup_result" && cd "$(git rev-parse --git-common-dir)" && pwd)"
1698                 else
1699                         git_common_dir="$git_dir"
1700                 fi
1701         fi
1702         [ -n "$git_dir" ] && [ -n "$git_common_dir" ] &&
1703         [ -d "$git_dir" ] && [ -d "$git_common_dir" ] || die "Not a git repository"
1704         git_hooks_dir="$git_common_dir/hooks"
1705         if vcmp "$git_version" '>=' "2.9" && gchp="$(git config --path --get core.hooksPath 2>/dev/null)" && [ -n "$gchp" ]; then
1706                 case "$gchp" in
1707                         /[!/]*)
1708                                 git_hooks_dir="$gchp"
1709                                 ;;
1710                         *)
1711                                 [ -n "$1" ] || warn "ignoring non-absolute core.hooksPath: $gchp"
1712                                 ;;
1713                 esac
1714                 unset gchp
1715         fi
1716 }
1717
1718 basic_setup()
1719 {
1720         setup_git_dirs $1
1721         if [ -z "$base_remote" ]; then
1722                 if [ "${TG_EXPLICIT_REMOTE+set}" = "set" ]; then
1723                         base_remote="$TG_EXPLICIT_REMOTE"
1724                 else
1725                         base_remote="$(git config topgit.remote 2>/dev/null)" || :
1726                 fi
1727         fi
1728         tgsequester="$(git config --bool topgit.sequester 2>/dev/null)" || :
1729         tgnosequester=
1730         [ "$tgsequester" != "false" ] || tgnosequester=1
1731         unset tgsequester
1732
1733         # catch errors if topbases is used without being set
1734         unset tg_topbases_set
1735         topbases="programmer*:error"
1736         topbasesrx="programmer*:error}"
1737         oldbases="$topbases"
1738 }
1739
1740 ## Initial setup
1741 initial_setup()
1742 {
1743         # suppress the merge log editor feature since git 1.7.10
1744
1745         GIT_MERGE_AUTOEDIT=no
1746         export GIT_MERGE_AUTOEDIT
1747
1748         basic_setup $1
1749         iowopt=
1750         ! vcmp "$git_version" '>=' "2.5" || iowopt="--ignore-other-worktrees"
1751         gcfbopt=
1752         ! vcmp "$git_version" '>=' "2.6" || gcfbopt="--buffer"
1753         auhopt=
1754         ! vcmp "$git_version" '>=' "2.9" || auhopt="--allow-unrelated-histories"
1755         v_get_show_cdup root_dir
1756         root_dir="${root_dir:-.}"
1757         logrefupdates="$(git config --bool core.logallrefupdates 2>/dev/null)" || :
1758         [ "$logrefupdates" = "true" ] || logrefupdates=
1759
1760         # make sure root_dir doesn't end with a trailing slash.
1761
1762         root_dir="${root_dir%/}"
1763
1764         # create global temporary directories, inside GIT_DIR
1765
1766         tg_tmp_dir=
1767         trap 'rm -rf "$tg_tmp_dir"' EXIT
1768         trap 'exit 129' HUP
1769         trap 'exit 130' INT
1770         trap 'exit 131' QUIT
1771         trap 'exit 134' ABRT
1772         trap 'exit 143' TERM
1773         tg_tmp_dir="$(mktemp -d "$git_dir/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1774         [ -n "$tg_tmp_dir" ] || tg_tmp_dir="$(mktemp -d "${TMPDIR:-/tmp}/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1775         [ -n "$tg_tmp_dir" ] || [ -z "$TMPDIR" ] || tg_tmp_dir="$(mktemp -d "/tmp/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1776         tg_ref_cache="$tg_tmp_dir/tg~ref-cache"
1777         tg_ref_cache_br="$tg_ref_cache.br"
1778         tg_ref_cache_rbr="$tg_ref_cache.rbr"
1779         tg_ref_cache_ann="$tg_ref_cache.ann"
1780         tg_ref_cache_dep="$tg_ref_cache.dep"
1781         [ -n "$tg_tmp_dir" ] && [ -w "$tg_tmp_dir" ] && { >"$tg_ref_cache"; } >/dev/null 2>&1 ||
1782                 die "could not create a writable temporary directory"
1783
1784         # make sure global cache directory exists inside GIT_DIR or $tg_tmp_dir
1785
1786         user_id_no="$(id -u)" || :
1787         : "${user_id_no:=_99_}"
1788         tg_cache_dir="$git_common_dir/tg-cache"
1789         [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1790         [ -z "$tg_cache_dir" ] || tg_cache_dir="$tg_cache_dir/$user_id_no"
1791         [ -z "$tg_cache_dir" ] || [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1792         [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
1793         if [ -z "$tg_cache_dir" ]; then
1794                 tg_cache_dir="$tg_tmp_dir/tg-cache"
1795                 [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1796                 [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
1797         fi
1798         [ -n "$tg_cache_dir" ] ||
1799                 die "could not create a writable tg-cache directory (even a temporary one)"
1800
1801         # GIT_ALTERNATE_OBJECT_DIRECTORIES can contain double-quoted entries
1802         # since Git v2.11.1; however, it's only necessary for : (or perhaps ;)
1803         # so we avoid it if possible and require v2.11.1 to do it at all
1804         # otherwise just don't make an alternates temporary store in that case;
1805         # it's okay to not have one; everything will still work; the nicety of
1806         # making the temporary tree objects vanish when tg exits just won't
1807         # happen in that case but nothing will break also be sure to reuse
1808         # the parent's if we've been recursively invoked and it's for the
1809         # same repository we were invoked on
1810
1811         tg_use_alt_odb=1
1812         _odbdir="${GIT_OBJECT_DIRECTORY:-$git_common_dir/objects}"
1813         [ -n "$_odbdir" ] && [ -d "$_odbdir" ] || tg_use_alt_odb=
1814         _fulltmpdir=
1815         [ -z "$tg_use_alt_odb" ] || _fulltmpdir="$(cd "$tg_tmp_dir" && pwd -P)"
1816         case "$_fulltmpdir" in *[";:"]*) vcmp "$git_version" '>=' "2.11.1" || tg_use_alt_odb=; esac
1817         _fullodbdir=
1818         [ -z "$tg_use_alt_odb" ] || _fullodbdir="$(cd "$_odbdir" && pwd -P)"
1819         if [ -n "$tg_use_alt_odb" ] && [ -n "$TG_OBJECT_DIRECTORY" ] && [ -d "$TG_OBJECT_DIRECTORY/info" ] &&
1820            [ -f "$TG_OBJECT_DIRECTORY/info/alternates" ] && [ -r "$TG_OBJECT_DIRECTORY/info/alternates" ]; then
1821                 if IFS= read -r _otherodbdir <"$TG_OBJECT_DIRECTORY/info/alternates" &&
1822                    [ -n "$_otherodbdir" ] && [ "$_otherodbdir" = "$_fullodbdir" ]; then
1823                         tg_use_alt_odb=2
1824                 fi
1825         fi
1826         if [ "$tg_use_alt_odb" = "1" ]; then
1827                 # create an alternate objects database to keep the ephemeral objects in
1828                 mkdir -p "$tg_tmp_dir/objects/info"
1829                 echol "$_fullodbdir" >"$tg_tmp_dir/objects/info/alternates"
1830                 TG_OBJECT_DIRECTORY="$_fulltmpdir/objects"
1831                 case "$TG_OBJECT_DIRECTORY" in
1832                         *[";:"]*)
1833                                 # surround in "..." and backslash-escape internal '"' and '\\'
1834                                 _altodbdq="\"$(printf '%s\n' "$TG_OBJECT_DIRECTORY" |
1835                                         sed 's/\([""\\]\)/\\\1/g')\""
1836                                 ;;
1837                         *)
1838                                 _altodbdq="$TG_OBJECT_DIRECTORY"
1839                                 ;;
1840                 esac
1841                 TG_PRESERVED_ALTERNATES="$GIT_ALTERNATE_OBJECT_DIRECTORIES"
1842                 if [ -n "$GIT_ALTERNATE_OBJECT_DIRECTORIES" ]; then
1843                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq:$GIT_ALTERNATE_OBJECT_DIRECTORIES"
1844                 else
1845                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq"
1846                 fi
1847                 export TG_PRESERVED_ALTERNATES TG_OBJECT_DIRECTORY GIT_ALTERNATE_OBJECT_DIRECTORIES GIT_OBJECT_DIRECTORY
1848         fi
1849 }
1850
1851 set_topbases()
1852 {
1853         # refer to "top-bases" in a refname with $topbases
1854
1855         [ -z "$tg_topbases_set" ] || return 0
1856
1857         topbases_implicit_default=1
1858         # See if topgit.top-bases is set to heads or refs
1859         tgtb="$(git config "topgit.top-bases" 2>/dev/null)" || :
1860         if [ -n "$tgtb" ] && [ "$tgtb" != "heads" ] && [ "$tgtb" != "refs" ]; then
1861                 if [ -n "$1" ]; then
1862                         # never die on the hook script
1863                         unset tgtb
1864                 else
1865                         die "invalid \"topgit.top-bases\" setting (must be \"heads\" or \"refs\")"
1866                 fi
1867         fi
1868         if [ -n "$tgtb" ]; then
1869                 case "$tgtb" in
1870                 heads)
1871                         topbases="heads/{top-bases}"
1872                         topbasesrx="heads/[{]top-bases[}]"
1873                         oldbases="top-bases";;
1874                 refs)
1875                         topbases="top-bases"
1876                         topbasesrx="top-bases"
1877                         oldbases="heads/{top-bases}";;
1878                 esac
1879                 # MUST NOT be exported
1880                 unset tgtb tg_topbases_set topbases_implicit_default
1881                 tg_topbases_set=1
1882                 return 0
1883         fi
1884         unset tgtb
1885
1886         # check heads and top-bases and see what state the current
1887         # repository is in.  remotes are ignored.
1888
1889         hblist=" "
1890         topbases=
1891         both=
1892         newtb="heads/{top-bases}"
1893         while read -r rn && [ -n "$rn" ]; do case "$rn" in
1894                 "refs/heads/{top-bases}"/*)
1895                         case "$hblist" in *" ${rn#refs/$newtb/} "*)
1896                                 if [ "$topbases" != "heads/{top-bases}" ] && [ -n "$topbases" ]; then
1897                                         both=1
1898                                         break;
1899                                 else
1900                                         topbases="heads/{top-bases}"
1901                                         topbasesrx="heads/[{]top-bases[}]"
1902                                         oldbases="top-bases"
1903                                 fi
1904                         esac;;
1905                 "refs/top-bases"/*)
1906                         case "$hblist" in *" ${rn#refs/top-bases/} "*)
1907                                 if [ "$topbases" != "top-bases" ] && [ -n "$topbases" ]; then
1908                                         both=1
1909                                         break;
1910                                 else
1911                                         topbases="top-bases"
1912                                         topbasesrx="top-bases"
1913                                         oldbases="heads/{top-bases}"
1914                                 fi
1915                         esac;;
1916                 "refs/heads"/*)
1917                         hblist="$hblist${rn#refs/heads/} ";;
1918         esac; done <<-EOT
1919                 $(git for-each-ref --format='%(refname)' "refs/heads" "refs/top-bases" 2>/dev/null)
1920         EOT
1921         if [ -n "$both" ]; then
1922                 if [ -n "$1" ]; then
1923                         # hook script always prefers newer without complaint
1924                         topbases="heads/{top-bases}"
1925                         topbasesrx="heads/[{]top-bases[}]"
1926                         oldbases="top-bases"
1927                 else
1928                         # Complain and die
1929                         err "repository contains existing TopGit branches"
1930                         err "but some use refs/top-bases/... for the base"
1931                         err "and some use refs/heads/{top-bases}/... for the base"
1932                         err "with the latter being the new, preferred location"
1933                         err "set \"topgit.top-bases\" to either \"heads\" to use"
1934                         err "the new heads/{top-bases} location or \"refs\" to use"
1935                         err "the old top-bases location."
1936                         err "(the tg migrate-bases command can also resolve this issue)"
1937                         die "schizophrenic repository requires topgit.top-bases setting"
1938                 fi
1939         elif [ -n "$topbases" ]; then
1940                 unset topbases_implicit_default
1941         fi
1942
1943         [ -n "$topbases" ] || {
1944                 # default is still top-bases for now
1945                 topbases="top-bases"
1946                 topbasesrx="top-bases"
1947                 oldbases="heads/{top-bases}"
1948         }
1949         # MUST NOT be exported
1950         unset hblist both newtb rn tg_topases_set
1951         tg_topbases_set=1
1952         return 0
1953 }
1954
1955 # init_reflog "ref"
1956 # if "$logrefupdates" is set and ref is not under refs/heads/ then force
1957 # an empty log file to exist so that ref changes will be logged
1958 # "$1" must be a fully-qualified refname (i.e. start with "refs/")
1959 # However, if "$1" is "refs/tgstash" then always make the reflog
1960 # The only ref not under refs/ that Git will write a reflog for is HEAD;
1961 # no matter what, it will NOT update a reflog for any other bare refs so
1962 # just quietly succeed when passed TG_STASH without doing anything.
1963 init_reflog()
1964 {
1965         [ -n "$1" ] && [ "$1" != "TG_STASH" ] || return 0
1966         [ -n "$logrefupdates" ] || [ "$1" = "refs/tgstash" ] || return 0
1967         case "$1" in refs/heads/*|HEAD) return 0;; refs/*[!/]);; *) return 1; esac
1968         mkdir -p "$git_common_dir/logs/${1%/*}" 2>/dev/null || :
1969         { >>"$git_common_dir/logs/$1" || :; } 2>/dev/null
1970  }
1971
1972 # store the "realpath" for "$2" in "$1" except the leaf is not resolved if it's
1973 # a symbolic link.  The directory part must exist, but the basename need not.
1974 v_get_abs_path()
1975 {
1976         [ -n "$1" ] && [ -n "$2" ] || return 1
1977         set -- "$1" "$2" "${2%/}"
1978         case "$3" in
1979                 */*) set -- "$1" "$2" "${3%/*}";;
1980                 *  ) set -- "$1" "$2" ".";;
1981         esac
1982         case "$2" in */)
1983                 set -- "$1" "${2%/}" "$3" "/"
1984         esac
1985         [ -d "$3" ] || return 1
1986         eval "$1="'"$(cd "$3" && pwd -P)/${2##*/}$4"'
1987 }
1988
1989 ## Startup
1990
1991 : "${TG_INST_CMDDIR:=@cmddir@}"
1992 : "${TG_INST_SHAREDIR:=@sharedir@}"
1993 : "${TG_INST_HOOKSDIR:=@hooksdir@}"
1994
1995 [ -d "$TG_INST_CMDDIR" ] ||
1996         die "No command directory: '$TG_INST_CMDDIR'"
1997
1998 ## Include awk scripts and their utility functions (separated for easier debugging)
1999
2000 [ -f "$TG_INST_CMDDIR/tg--awksome" ] && [ -r "$TG_INST_CMDDIR/tg--awksome" ] ||
2001         die "Missing awk scripts: '$TG_INST_CMDDIR/tg--awksome'"
2002 . "$TG_INST_CMDDIR/tg--awksome"
2003
2004 if [ -n "$tg__include" ]; then
2005
2006         # We were sourced from another script for our utility functions;
2007         # this is set by hooks.  Skip the rest of the file.  A simple return doesn't
2008         # work as expected in every shell.  See http://bugs.debian.org/516188
2009
2010         # ensure setup happens
2011
2012         initial_setup 1
2013         set_topbases 1
2014
2015 else
2016
2017         set -e
2018
2019         tgbin="$0"
2020         tgdir="${tgbin%/}"
2021         case "$tgdir" in */*);;*) tgdir="./$tgdir"; esac
2022         tgdir="${tgdir%/*}/"
2023         tgname="${tgbin##*/}"
2024         [ "$0" != "$tgname" ] || tgdir=""
2025
2026         # If tg contains a '/' but does not start with one then replace it with an absolute path
2027
2028         case "$0" in /*) ;; */*)
2029                 tgdir="$(cd "${0%/*}" && pwd -P)/"
2030                 tgbin="$tgdir$tgname"
2031         esac
2032
2033         # tgdisplay will include any explicit -C <dir> etc. options whereas tgname will not
2034         # tgdisplayac is the same as tgdisplay but without any -r or -u options (ac => abort/continue)
2035
2036         tgdisplaydir="$tgdir"
2037         tgdisplay="$tgbin"
2038         tgdisplayac="$tgdisplay"
2039         if
2040             v_get_abs_path _tgnameabs "$(cmd_path "$tgname")" &&
2041             _tgabs="$_tgnameabs" &&
2042             { [ "$tgbin" = "$tgname" ] || v_get_abs_path _tgabs "$tgbin"; } &&
2043             [ "$_tgabs" = "$_tgnameabs" ]
2044         then
2045                 tgdisplaydir=""
2046                 tgdisplay="$tgname"
2047                 tgdisplayac="$tgdisplay"
2048         fi
2049         [ -z "$_tgabs" ] || tgbin="$_tgabs"
2050         unset _tgabs _tgnameabs
2051
2052         tg() { command "$tgbin" "$@"; }
2053
2054         explicit_remote=
2055         explicit_dir=
2056         gitcdopt=
2057         noremote=
2058
2059         cmd=
2060         while :; do case "$1" in
2061
2062                 help|--help|-h)
2063                         cmd=help
2064                         shift
2065                         break;;
2066
2067                 status|--status)
2068                         cmd=status
2069                         shift
2070                         break;;
2071
2072                 --hooks-path)
2073                         cmd=hooks-path
2074                         shift
2075                         break;;
2076
2077                 --exec-path)
2078                         cmd=exec-path
2079                         shift
2080                         break;;
2081
2082                 --top-bases)
2083                         cmd=top-bases
2084                         shift
2085                         break;;
2086
2087                 -r)
2088                         shift
2089                         if [ -z "$1" ]; then
2090                                 echo "Option -r requires an argument." >&2
2091                                 do_help
2092                                 exit 1
2093                         fi
2094                         unset noremote
2095                         base_remote="$1"
2096                         explicit_remote="$base_remote"
2097                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -r $explicit_remote"
2098                         TG_EXPLICIT_REMOTE="$base_remote" && export TG_EXPLICIT_REMOTE
2099                         shift;;
2100
2101                 -u)
2102                         unset base_remote explicit_remote
2103                         noremote=1
2104                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -u"
2105                         TG_EXPLICIT_REMOTE= && export TG_EXPLICIT_REMOTE
2106                         shift;;
2107
2108                 -C)
2109                         shift
2110                         if [ -z "$1" ]; then
2111                                 echo "Option -C requires an argument." >&2
2112                                 do_help
2113                                 exit 1
2114                         fi
2115                         cd "$1"
2116                         unset GIT_DIR GIT_COMMON_DIR
2117                         if [ -z "$explicit_dir" ]; then
2118                                 explicit_dir="$1"
2119                         else
2120                                 explicit_dir="$PWD"
2121                         fi
2122                         gitcdopt=" -C \"$explicit_dir\""
2123                         [ "$explicit_dir" != "." ] || explicit_dir="." gitcdopt=" -C ."
2124                         tgdisplay="$tgdisplaydir$tgname$gitcdopt"
2125                         tgdisplayac="$tgdisplay"
2126                         [ -z "$explicit_remote" ] || tgdisplay="$tgdisplay -r $explicit_remote"
2127                         [ -z "$noremote" ] || tgdisplay="$tgdisplay -u"
2128                         shift;;
2129
2130                 -c)
2131                         shift
2132                         if [ -z "$1" ]; then
2133                                 echo "Option -c requires an argument." >&2
2134                                 do_help
2135                                 exit 1
2136                         fi
2137                         param="'$(printf '%s\n' "$1" | sed "s/[']/'\\\\''/g")'"
2138                         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }$param"
2139                         export GIT_CONFIG_PARAMETERS
2140                         shift;;
2141
2142                 --)
2143                         shift
2144                         break;;
2145
2146                 -*)
2147                         echo "Invalid option $1 (subcommand options must appear AFTER the subcommand)." >&2
2148                         do_help
2149                         exit 1;;
2150
2151                 *)
2152                         break;;
2153
2154         esac; done
2155
2156         [ -n "$cmd" -o $# -lt 1 ] || { cmd="$1"; shift; }
2157
2158         ## Dispatch
2159
2160         [ -n "$cmd" ] || { do_help; exit 1; }
2161
2162         case "$cmd" in
2163
2164                 help)
2165                         do_help "$@"
2166                         exit 0;;
2167
2168                 status|st)
2169                         unset base_remote
2170                         basic_setup
2171                         set_topbases
2172                         do_status "$@"
2173                         exit ${do_status_result:-0};;
2174
2175                 hooks-path)
2176                         # Internal command
2177                         echol "$TG_INST_HOOKSDIR";;
2178
2179                 exec-path)
2180                         # Internal command
2181                         echol "$TG_INST_CMDDIR";;
2182
2183                 top-bases)
2184                         # Maintenance command
2185                         ! git rev-parse --git-dir >/dev/null 2>&1 || setup_git_dirs
2186                         set_topbases
2187                         echol "refs/$topbases";;
2188
2189                 *)
2190                         isutil=
2191                         case "$cmd" in index-merge-one-file)
2192                                 isutil="-"
2193                         esac
2194                         [ -r "$TG_INST_CMDDIR"/tg-$isutil$cmd ] || {
2195                                 looplevel="$TG_ALIAS_DEPTH"
2196                                 [ "${looplevel#[1-9]}" != "$looplevel" ] &&
2197                                 [ "${looplevel%%[!0-9]*}" = "$looplevel" ] ||
2198                                 looplevel=0
2199                                 tgalias="$(git config "topgit.alias.$cmd" 2>/dev/null)" || :
2200                                 [ -n "$tgalias" ] || {
2201                                         echo "Unknown subcommand: $cmd" >&2
2202                                         do_help
2203                                         exit 1
2204                                 }
2205                                 looplevel=$(( $looplevel + 1 ))
2206                                 [ $looplevel -le 10 ] || die "topgit.alias nesting level 10 exceeded"
2207                                 TG_ALIAS_DEPTH="$looplevel"
2208                                 export TG_ALIAS_DEPTH
2209                                 if [ "!${tgalias#?}" = "$tgalias" ]; then
2210                                         unset GIT_PREFIX
2211                                         if pfx="$(git rev-parse --show-prefix 2>/dev/null)"; then
2212                                                 GIT_PREFIX="$pfx"
2213                                                 export GIT_PREFIX
2214                                         fi
2215                                         cd "./$(git rev-parse --show-cdup 2>/dev/null)"
2216                                         exec @SHELL_PATH@ -c "${tgalias#?} \"\$@\"" @SHELL_PATH@ "$@"
2217                                 else
2218                                         eval 'exec "$tgbin"' "$tgalias" '"$@"'
2219                                 fi
2220                                 die "alias execution failed for: $tgalias"
2221                         }
2222                         unset TG_ALIAS_DEPTH
2223
2224                         showing_help=
2225                         if [ "$*" = "-h" ] || [ "$*" = "--help" ]; then
2226                                 showing_help=1
2227                         fi
2228
2229                         [ -n "$showing_help" ] || initial_setup
2230                         [ -z "$noremote" ] || unset base_remote
2231
2232                         nomergesetup="$showing_help"
2233                         case "$cmd" in base|contains|info|log|rebase|revert|summary|tag)
2234                                 # avoid merge setup where not necessary
2235
2236                                 nomergesetup=1
2237                         esac
2238
2239                         if [ -z "$nomergesetup" ]; then
2240                                 # make sure merging the .top* files will always behave sanely
2241
2242                                 setup_ours
2243                                 setup_hook "pre-commit"
2244                         fi
2245
2246                         # everything but rebase needs topbases set
2247                         carefully="$showing_help"
2248                         [ "$cmd" != "migrate-bases" ] || carefully=1
2249                         [ "$cmd" = "rebase" ] || set_topbases $carefully
2250
2251                         _use_ref_cache=
2252                         tg_read_only=1
2253                         case "$cmd$showing_help" in
2254                                 contains|export|info|summary|tag)
2255                                         _use_ref_cache=1;;
2256                                 annihilate|create|delete|depend|import|update)
2257                                         tg_use_alt_odb=
2258                                         tg_read_only=;;
2259                         esac
2260                         [ -z "$_use_ref_cache" ] || v_create_ref_cache
2261
2262                         fullcmd="${tgname:-tg} $cmd $*"
2263                         . "$TG_INST_CMDDIR"/tg-$isutil$cmd;;
2264         esac
2265
2266 fi