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         echo 1 >"$tg_tmp_dir/tg~ref-dirs-created"
 528 }
 529
 530 # If the first argument is non-empty, stores "1" there if this call created the cache
 531 v_create_ref_cache()
 532 {
 533         [ -n "$tg_ref_cache" -a ! -s "$tg_ref_cache" ] || return 0
 534         _remotespec=
 535         [ -z "$base_remote" ] || _remotespec="refs/remotes/$base_remote"
 536         [ -z "$1" ] || eval "$1=1"
 537         git for-each-ref --format='%(refname) %(objectname)' \
 538                 refs/heads "refs/$topbases" $_remotespec >"$tg_ref_cache"
 539         create_ref_dirs
 540 }
 541
 542 remove_ref_cache()
 543 {
 544         [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ] || return 0
 545         >"$tg_ref_cache"
 546         >"$tg_ref_cache_br"
 547         >"$tg_ref_cache_rbr"
 548         >"$tg_ref_cache_ann"
 549         >"$tg_ref_cache_dep"
 550 }
 551
 552 # setting tg_ref_cache_only to non-empty will force non-$tg_ref_cache lookups to fail
 553 rev_parse()
 554 {
 555         if [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ]; then
 556                 awk -v r="$1" 'BEGIN {e=1}; $1 == r {print $2; e=0; exit}; END {exit e}' <"$tg_ref_cache"
 557         else
 558                 [ -z "$tg_ref_cache_only" ] || return 1
 559                 git rev-parse --quiet --verify "$1^0" -- 2>/dev/null
 560         fi
 561 }
 562
 563 # ref_exists_rev REF
 564 # Whether REF is a valid ref name
 565 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 566 # or, if $base_remote is set, refs/remotes/$base_remote/
 567 # Caches result if $tg_read_only and outputs HASH on success
 568 ref_exists_rev()
 569 {
 570         case "$1" in
 571                 refs/*)
 572                         ;;
 573                 $octet20)
 574                         printf '%s' "$1"
 575                         return;;
 576                 *)
 577                         die "ref_exists_rev requires fully-qualified ref name (given: $1)"
 578         esac
 579         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify "$1^0" -- 2>/dev/null; return; }
 580         _result=
 581         _result_rev=
 582         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.ref"; } 2>/dev/null || :
 583         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 584         _result_rev="$(rev_parse "$1")"
 585         _result=$?
 586         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 587         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 588         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.ref" 2>/dev/null || :
 589         printf '%s' "$_result_rev"
 590         return $_result
 591 }
 592
 593 # Same as ref_exists_rev but output is abbreviated hash
 594 # Optional second argument defaults to --short but may be any --short=.../--no-short option
 595 ref_exists_rev_short()
 596 {
 597         case "$1" in
 598                 refs/*)
 599                         ;;
 600                 $octet20)
 601                         ;;
 602                 *)
 603                         die "ref_exists_rev_short requires fully-qualified ref name"
 604         esac
 605         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify ${2:---short} "$1^0" -- 2>/dev/null; return; }
 606         _result=
 607         _result_rev=
 608         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.rfs"; } 2>/dev/null || :
 609         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 610         _result_rev="$(rev_parse "$1")"
 611         _result=$?
 612         if [ $_result -eq 0 ]; then
 613                 _result_rev="$(git rev-parse --verify ${2:---short} --quiet "$_result_rev" --)"
 614                 _result=$?
 615         fi
 616         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 617         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 618         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.rfs" 2>/dev/null || :
 619         printf '%s' "$_result_rev"
 620         return $_result
 621 }
 622
 623 # ref_exists REF
 624 # Whether REF is a valid ref name
 625 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 626 # or, if $base_remote is set, refs/remotes/$base_remote/
 627 # Caches result
 628 ref_exists()
 629 {
 630         ref_exists_rev "$1" >/dev/null
 631 }
 632
 633 # rev_parse_tree REF
 634 # Runs git rev-parse REF^{tree}
 635 # Caches result if $tg_read_only
 636 rev_parse_tree()
 637 {
 638         [ -n "$tg_read_only" ] || { git rev-parse --verify "$1^{tree}" -- 2>/dev/null; return; }
 639         if [ -f "$tg_tmp_dir/cached/$1/.rpt" ]; then
 640                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 641                         printf '%s\n' "$_result"
 642                         return 0
 643                 fi
 644                 return 1
 645         fi
 646         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null || :
 647         if [ -d "$tg_tmp_dir/cached/$1" ]; then
 648                 git rev-parse --verify "$1^{tree}" -- >"$tg_tmp_dir/cached/$1/.rpt" 2>/dev/null || :
 649                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 650                         printf '%s\n' "$_result"
 651                         return 0
 652                 fi
 653                 return 1
 654         fi
 655         git rev-parse --verify "$1^{tree}" -- 2>/dev/null
 656 }
 657
 658 # has_remote BRANCH
 659 # Whether BRANCH has a remote equivalent (accepts ${topbases#heads/}/ too)
 660 has_remote()
 661 {
 662         [ -n "$base_remote" ] && ref_exists "refs/remotes/$base_remote/$1"
 663 }
 664
 665 # Return the verified TopGit branch name for "$2" in "$1" or die with an error.
 666 # If -z "$1" still set return code but do not return result
 667 # As a convenience, if HEAD or @ is given and HEAD is a symbolic ref to
 668 # refs/heads/... then ... will be verified instead.
 669 # if "$3" = "-f" (for fail) then return an error rather than dying.
 670 v_verify_topgit_branch()
 671 {
 672         if [ "$2" = "HEAD" ] || [ "$2" = "@" ]; then
 673                 _verifyname="$(git symbolic-ref HEAD 2>/dev/null)" || :
 674                 [ -n "$_verifyname" -o "$3" = "-f" ] || die "HEAD is not a symbolic ref"
 675                 case "$_verifyname" in refs/"$topbases"/*|refs/heads/*);;*)
 676                         [ "$3" != "-f" ] || return 1
 677                         die "HEAD is not a symbolic ref to the refs/heads namespace"
 678                 esac
 679                 set -- "$1" "$_verifyname" "$3"
 680         fi
 681         case "$2" in
 682                 refs/"$topbases"/*)
 683                         _verifyname="${2#refs/$topbases/}"
 684                         ;;
 685                 refs/heads/*)
 686                         _verifyname="${2#refs/heads/}"
 687                         ;;
 688                 *)
 689                         _verifyname="$2"
 690                         ;;
 691         esac
 692         if ! ref_exists "refs/heads/$_verifyname"; then
 693                 [ "$3" != "-f" ] || return 1
 694                 die "no such branch: $_verifyname"
 695         fi
 696         if ! ref_exists "refs/$topbases/$_verifyname"; then
 697                 [ "$3" != "-f" ] || return 1
 698                 die "not a TopGit-controlled branch: $_verifyname"
 699         fi
 700         [ -z "$1" ] || eval "$1="'"$_verifyname"'
 701 }
 702
 703 # Return the verified TopGit branch name or die with an error.
 704 # As a convenience, if HEAD or @ is given and HEAD is a symbolic ref to
 705 # refs/heads/... then ... will be verified instead.
 706 # if "$2" = "-f" (for fail) then return an error rather than dying.
 707 verify_topgit_branch()
 708 {
 709         v_verify_topgit_branch _verifyname "$@" || return
 710         printf '%s' "$_verifyname"
 711 }
 712
 713 # Caches result
 714 # $1 = branch name (i.e. "t/foo/bar")
 715 # $2 = optional result of rev-parse "refs/heads/$1"
 716 # $3 = optional result of rev-parse "refs/$topbases/$1"
 717 branch_annihilated()
 718 {
 719         _branch_name="$1"
 720         _rev="${2:-$(ref_exists_rev "refs/heads/$_branch_name")}"
 721         _rev_base="${3:-$(ref_exists_rev "refs/$topbases/$_branch_name")}"
 722
 723         _result=
 724         _result_rev=
 725         _result_rev_base=
 726         { read -r _result _result_rev _result_rev_base <"$tg_cache_dir/refs/heads/$_branch_name/.ann"; } 2>/dev/null || :
 727         [ -z "$_result" -o "$_result_rev" != "$_rev" -o "$_result_rev_base" != "$_rev_base" ] || return $_result
 728
 729         # use the merge base in case the base is ahead.
 730         mb="$(git merge-base "$_rev_base" "$_rev" 2>/dev/null)"
 731
 732         test -z "$mb" || test "$(rev_parse_tree "$mb")" = "$(rev_parse_tree "$_rev")"
 733         _result=$?
 734         [ -d "$tg_cache_dir/refs/heads/$_branch_name" ] || mkdir -p "$tg_cache_dir/refs/heads/$_branch_name" 2>/dev/null
 735         [ ! -d "$tg_cache_dir/refs/heads/$_branch_name" ] ||
 736         echo $_result $_rev $_rev_base >"$tg_cache_dir/refs/heads/$_branch_name/.ann" 2>/dev/null || :
 737         return $_result
 738 }
 739
 740 non_annihilated_branches()
 741 {
 742         [ $# -gt 0 ] || set -- "refs/$topbases"
 743         git for-each-ref --format='%(objectname) %(refname)' "$@" |
 744                 while read rev ref; do
 745                         name="${ref#refs/$topbases/}"
 746                         if branch_annihilated "$name" "" "$rev"; then
 747                                 continue
 748                         fi
 749                         echol "$name"
 750                 done
 751 }
 752
 753 # Make sure our tree is clean
 754 # if optional "$1" given also verify that a checkout to "$1" would succeed
 755 ensure_clean_tree()
 756 {
 757         check_status
 758         [ -z "$tg_state$git_state" ] || { do_status; exit 1; }
 759         git update-index --ignore-submodules --refresh ||
 760                 die "the working directory has uncommitted changes (see above) - first commit or reset them"
 761         [ -z "$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)" ] ||
 762                 die "the index has uncommited changes"
 763         [ -z "$1" ] || git read-tree -n -u -m "$1" ||
 764                 die "git checkout \"$1\" would fail"
 765 }
 766
 767 # Make sure .topdeps and .topmsg are "clean"
 768 # They are considered "clean" if each is identical in worktree, index and HEAD
 769 # With "-u" as the argument skip the HEAD check (-u => unborn)
 770 # untracked .topdeps and/or .topmsg files are always considered "dirty" as well
 771 # with -u them just existing constitutes "dirty"
 772 ensure_clean_topfiles()
 773 {
 774         _dirtw=0
 775         _dirti=0
 776         _dirtu=0
 777         _check="$(git diff-files --ignore-submodules --name-only -- :/.topdeps :/.topmsg)" &&
 778         [ -z "$_check" ] || _dirtw=1
 779         if [ "$1" != "-u" ]; then
 780                 _check="$(git diff-index --cached --ignore-submodules --name-only HEAD -- :/.topdeps :/.topmsg)" &&
 781                 [ -z "$_check" ] || _dirti=1
 782         fi
 783         if [ "$_dirti$_dirtw" = "00" ]; then
 784                 v_get_show_cdup
 785                 if [ -e "${git_cdup_result}.topdeps" ] || [ -e "${git_cdup_result}.topmsg" ]; then
 786                         [ "$1" != "-u" ] &&
 787                         _check="$(git status --porcelain --ignored --untracked-files --ignore-submodules -- :/.topdeps :/.topmsg)" &&
 788                         [ -z "$_check" ] || _dirtu=1
 789                 fi
 790         fi
 791         if [ "$_dirtu$_dirti$_dirtw" != "000" ]; then
 792                 git status --ignored --untracked-files --ignore-submodules -- :/.topdeps :/.topmsg || :
 793                 case "$_dirtu$_dirti$_dirtw" in
 794                 001) die "the working directory has uncommitted changes (see above) - first commit or reset them";;
 795                 010) die "the index has uncommited changes (see above)";;
 796                 011) die "the working directory and index have uncommitted changes (see above) - first commit or reset them";;
 797                 100) die "the working directory has untracked files that would be overwritten (see above)";;
 798                 esac
 799         fi
 800 }
 801
 802 # is_sha1 REF
 803 # Whether REF is a SHA1 (compared to a symbolic name).
 804 is_sha1()
 805 {
 806         case "$1" in $octet20) return 0;; esac
 807         return 1
 808 }
 809
 810 # recurse_deps_internal NAME [BRANCHPATH...]
 811 # get recursive list of dependencies with leading 0 if branch exists 1 if missing
 812 # followed by a 1 if the branch is "tgish" (2 if it also has a remote); 0 if not
 813 # followed by a 0 for a non-leaf, 1 for a leaf or 2 for annihilated tgish
 814 # but missing and remotes are always "0"
 815 # then the branch name followed by its depedency chain (which might be empty)
 816 # An output line might look like this:
 817 #   0 1 1 t/foo/leaf t/foo/int t/stage
 818 # If no_remotes is non-empty, exclude remotes
 819 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
 820 # If with_top_level is non-empty, include the top-level that's normally omitted
 821 # any branch names in the space-separated recurse_deps_exclude variable
 822 # are skipped (along with their dependencies)
 823 recurse_deps_internal()
 824 {
 825         case " $recurse_deps_exclude " in *" $1 "*) return 0; esac
 826         ratr_opts="${recurse_preorder:+-f} ${with_top_level:+-s}"
 827         dogfer=
 828         dorad=1
 829         userc=
 830         tmpdep=
 831         if [ -n "$tg_read_only" ] && [ -n "$tg_ref_cache" ]; then
 832                 userc=1
 833                 tmprfs="$tg_ref_cache"
 834                 tmptgbr="$tg_ref_cache_br"
 835                 tmpann="$tg_ref_cache_ann"
 836                 tmpdep="$tg_ref_cache_dep"
 837                 [ -s "$tg_ref_cache" ] || dogfer=1
 838                 [ -n "$dogfer" ] || ! [ -s "$tmptgbr" ] || ! [ -f "$tmpann" ] || ! [ -s "$tmpdep" ] || dorad=
 839         else
 840                 ratr_opts="$ratr_opts -rmh -rma -rmb"
 841                 tmprfs="$tg_tmp_dir/refs.$$"
 842                 tmpann="$tg_tmp_dir/ann.$$"
 843                 tmptgbr="$tg_tmp_dir/tgbr.$$"
 844                 dogfer=1
 845         fi
 846         refpats="\"refs/heads\" \"refs/\$topbases\""
 847         [ -z "$base_remote" ] || refpats="$refpats \"refs/remotes/\$base_remote\""
 848         tmptgrmtbr=
 849         dorab=1
 850         if [ -z "$no_remotes" ] && [ -n "$base_remote" ]; then
 851                 if [ -n "$userc" ]; then
 852                         tmptgrmtbr="$tg_ref_cache_rbr"
 853                         [ -n "$dogfer" ] || ! [ -s "$tmptgrmtbr" ] || dorab=
 854                 else
 855                         tmptgrmtbr="$tg_tmp_dir/tgrmtbr.$$"
 856                         ratr_opts="$ratr_opts -rmr"
 857                 fi
 858                 ratr_opts="$ratr_opts -r=\"\$tmptgbr\" -u=\"refs/remotes/\$base_remote/\${topbases#heads/}\""
 859         fi
 860         [ -z "$dogfer" ] ||
 861         eval git for-each-ref '--format="%(refname) %(objectname)"' "$refpats" >"$tmprfs"
 862         if [ -n "$tmptgrmtbr" ] && [ -n "$dorab" ]; then
 863                 run_awk_topgit_branches -n -h="refs/remotes/$base_remote" -r="$tmprfs" \
 864                         "refs/remotes/$base_remote/${topbases#heads/}" >"$tmptgrmtbr"
 865         fi
 866         depscmd='run_awk_topgit_deps -a="$tmpann" -b="$tmptgbr" -r="$tmprfs" -m="$mtblob" "refs/$topbases"'
 867         if [ -n "$userc" ]; then
 868                 if [ -n "$dorad" ]; then
 869                         eval "$depscmd" >"$tmpdep"
 870                 fi
 871                 depscmd='<"$tmpdep" '
 872         else
 873                 depscmd="$depscmd |"
 874         fi
 875         eval "$depscmd" run_awk_topgit_recurse '-a="$tmpann" -b="$tmptgbr"' \
 876                 '-c=1 -h="$tmprfs"' "$ratr_opts" '-x="$recurse_deps_exclude"' '"$@"'
 877 }
 878
 879 # do_eval CMD
 880 # helper for recurse_deps so that a return statement executed inside CMD
 881 # does not return from recurse_deps.  This shouldn't be necessary, but it
 882 # seems that it actually is.
 883 do_eval()
 884 {
 885         eval "$@"
 886 }
 887
 888 # becomes read-only for caching purposes
 889 # assigns new value to tg_read_only
 890 # become_cacheable/undo_become_cacheable calls may be nested
 891 become_cacheable()
 892 {
 893         _old_tg_read_only="$tg_read_only"
 894         if [ -z "$tg_read_only" ]; then
 895                 ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 896                 rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 897                 tg_read_only=1
 898         fi
 899         _my_ref_cache=
 900         v_create_ref_cache _my_ref_cache
 901         _my_ref_cache="${_my_ref_cache:+1}"
 902         tg_read_only="undo${_my_ref_cache:-0}-$_old_tg_read_only"
 903 }
 904
 905 # restores tg_read_only and ref_cache to state before become_cacheable call
 906 # become_cacheable/undo_bocome_cacheable calls may be nested
 907 undo_become_cacheable()
 908 {
 909         case "$tg_read_only" in
 910                 "undo"[01]"-"*)
 911                         _suffix="${tg_read_only#undo?-}"
 912                         [ "${tg_read_only%$_suffix}" = "undo0-" ] || remove_ref_cache
 913                         tg_read_only="$_suffix"
 914         esac
 915 }
 916
 917 # just call this, no undo, sets tg_read_only= and removes ref cache and cached results
 918 become_non_cacheable()
 919 {
 920         remove_ref_cache
 921         tg_read_only=
 922         ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 923         rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 924 }
 925
 926 # call this to make sure Git will not complain about a missing user/email
 927 # result is cached in TG_IDENT_CHECKED and a non-empty value suppresses the check
 928 ensure_ident_available()
 929 {
 930         [ -z "$TG_IDENT_CHECKED" ] || return 0
 931         git var GIT_AUTHOR_IDENT >/dev/null &&
 932         git var GIT_COMMITTER_IDENT >/dev/null || exit
 933         TG_IDENT_CHECKED=1
 934         export TG_IDENT_CHECKED
 935         return 0
 936 }
 937
 938 # recurse_deps CMD NAME [BRANCHPATH...]
 939 # Recursively eval CMD on all dependencies of NAME.
 940 # Dependencies are visited in topological order.
 941 # CMD can refer to the following variables:
 942 #
 943 #   _ret              starts as 0; CMD can change; will be final return result
 944 #   _dep              bare branch name or "refs/remotes/..." for a remote base
 945 #   _name             has $_dep in its .topdeps ("" for top and $with_top_level)
 946 #   _depchain         0+ space-separated branch names forming a path to top
 947 #   _dep_missing      boolean "1" if no such $_dep ref; "" if ref present
 948 #   _dep_is_leaf      boolean "1" if leaf; "" if not
 949 #   _dep_is_tgish     boolean "1" if tgish; "" if not (which implies no remote)
 950 #   _dep_has_remote   boolean "1" if $_dep has_remote; "" if not
 951 #   _dep_annihilated  boolean "1" if $_dep annihilated; "" if not
 952 #
 953 # CMD may use a "return" statement without issue; its return value is ignored,
 954 # but if CMD sets _ret to a negative value, e.g. "-0" or "-1" the enumeration
 955 # will stop immediately and the value with the leading "-" stripped off will
 956 # be the final result code
 957 #
 958 # CMD can refer to $_name for queried branch name,
 959 # $_dep for dependency name,
 960 # $_depchain for space-seperated branch backtrace,
 961 # $_dep_missing boolean to check whether $_dep is present
 962 # and the $_dep_is_tgish and $_dep_annihilated booleans.
 963 # If recurse_preorder is NOT set then the $_dep_is_leaf boolean is also valid.
 964 # It can modify $_ret to affect the return value
 965 # of the whole function.
 966 # If recurse_deps() hits missing dependencies, it will append
 967 # them to space-separated $missing_deps list and skip them
 968 # after calling CMD with _dep_missing set.
 969 # remote dependencies are processed if no_remotes is unset.
 970 # any branch names in the space-separated recurse_deps_exclude variable
 971 # are skipped (along with their dependencies)
 972 #
 973 # If no_remotes is non-empty, exclude remotes
 974 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
 975 # If with_top_level is non-empty, include the top-level that's normally omitted
 976 # any branch names in the space-separated recurse_deps_exclude variable
 977 # are skipped (along with their dependencies)
 978 recurse_deps()
 979 {
 980         _cmd="$1"; shift
 981
 982         _depsfile="$(get_temp tg-depsfile)"
 983         recurse_deps_internal -- "$@" >"$_depsfile" || :
 984
 985         _ret=0
 986         while read _ismissing _istgish _isleaf _dep _name _deppath; do
 987                 _depchain="$_name${_deppath:+ $_deppath}"
 988                 _dep_is_tgish=
 989                 [ "$_istgish" = "0" ] || _dep_is_tgish=1
 990                 _dep_has_remote=
 991                 [ "$_istgish" != "2" ] || _dep_has_remote=1
 992                 _dep_missing=
 993                 if [ "$_ismissing" != "0" ]; then
 994                         _dep_missing=1
 995                         case " $missing_deps " in *" $_dep "*);;*)
 996                                 missing_deps="${missing_deps:+$missing_deps }$_dep"
 997                         esac
 998                 fi
 999                 _dep_annihilated=
1000                 _dep_is_leaf=
1001                 if [ "$_isleaf" = "1" ]; then
1002                         _dep_is_leaf=1
1003                 elif [ "$_isleaf" = "2" ]; then
1004                         _dep_annihilated=1
1005                 fi
1006                 do_eval "$_cmd" || :
1007                 if [ "${_ret#-}" != "$_ret" ]; then
1008                         _ret="${_ret#-}"
1009                         break
1010                 fi
1011         done <"$_depsfile"
1012         rm -f "$_depsfile"
1013         return ${_ret:-0}
1014 }
1015
1016 find_leaves_internal()
1017 {
1018         if [ -n "$_dep_is_leaf" ] && [ -z "$_dep_annihilated" ] && [ -z "$_dep_missing" ]; then
1019                 if [ -n "$_dep_is_tgish" ]; then
1020                         fulldep="refs/$topbases/$_dep"
1021                 else
1022                         fulldep="refs/heads/$_dep"
1023                 fi
1024                 case " $seen_leaf_refs " in *" $fulldep "*);;*)
1025                         seen_leaf_refs="${seen_leaf_refs:+$seen_leaf_refs }$fulldep"
1026                         if fullrev="$(ref_exists_rev "$fulldep")"; then
1027                                 case " $seen_leaf_revs " in *" $fullrev "*);;*)
1028                                         seen_leaf_revs="${seen_leaf_revs:+$seen_leaf_revs }$fullrev"
1029                                         # See if Git knows it by another name
1030                                         if tagname="$(git describe --exact-match "$fullrev" 2>/dev/null)" && [ -n "$tagname" ]; then
1031                                                 echo "refs/tags/$tagname"
1032                                         else
1033                                                 echo "$fulldep"
1034                                         fi
1035                                 esac
1036                         fi
1037                 esac
1038         fi
1039 }
1040
1041 # find_leaves NAME
1042 # output (one per line) the unique leaves of NAME
1043 # a leaf is either
1044 #   1) a non-tgish dependency
1045 #   2) the base of a tgish dependency with no non-annihilated dependencies
1046 # duplicates are suppressed (by commit rev) and remotes are always ignored
1047 # if a leaf has an exact tag match that will be output
1048 # note that recurse_deps_exclude IS honored for this operation
1049 find_leaves()
1050 {
1051         no_remotes=1
1052         with_top_level=1
1053         recurse_preorder=
1054         seen_leaf_refs=
1055         seen_leaf_revs=
1056         recurse_deps find_leaves_internal "$1"
1057         with_top_level=
1058 }
1059
1060 # branch_needs_update
1061 # This is a helper function for determining whether given branch
1062 # is up-to-date wrt. its dependencies. It expects input as if it
1063 # is called as a recurse_deps() helper.
1064 # In case the branch does need update, it will echo it together
1065 # with the branch backtrace on the output (see needs_update()
1066 # description for details) and set $_ret to non-zero.
1067 branch_needs_update()
1068 {
1069         if [ -n "$_dep_missing" ]; then
1070                 echo "! $_dep $_depchain"
1071                 return 0
1072         fi
1073
1074         if [ -n "$_dep_is_tgish" ]; then
1075                 [ -z "$_dep_annihilated" ] || return 0
1076
1077                 if [ -n "$_dep_has_remote" ]; then
1078                         branch_contains "refs/heads/$_dep" "refs/remotes/$base_remote/$_dep" ||
1079                                 echo "refs/remotes/$base_remote/$_dep $_dep $_depchain"
1080                 fi
1081                 # We want to sync with our base first and should output this before
1082                 # the remote branch, but the order does not actually matter to tg-update
1083                 # as it just recurses regardless, but it does matter for tg-info (which
1084                 # treats out-of-date bases as though they were already merged in) so
1085                 # we output the remote before the base.
1086                 branch_contains "refs/heads/$_dep" "refs/$topbases/$_dep" || {
1087                         echo ": $_dep $_depchain"
1088                         _ret=1
1089                         return
1090                 }
1091         fi
1092
1093         if [ -n "$_name" ]; then
1094                 case "$_dep" in refs/*) _fulldep="$_dep";; *) _fulldep="refs/heads/$_dep";; esac
1095                 if ! branch_contains "refs/$topbases/$_name" "$_fulldep"; then
1096                         # Some new commits in _dep
1097                         echo "$_dep $_depchain"
1098                         _ret=1
1099                 fi
1100         fi
1101 }
1102
1103 # needs_update NAME
1104 # This function is recursive; it outputs reverse path from NAME
1105 # to the branch (e.g. B_DIRTY B1 B2 NAME), one path per line,
1106 # inner paths first. Innermost name can be refs/remotes/<remote>/<name>
1107 # if the head is not in sync with the <remote> branch <name>, ':' if
1108 # the head is not in sync with the base (in this order of priority)
1109 # or '!' if dependency is missing.  Note that the remote branch, base
1110 # order is reversed from the order they will actually be updated in
1111 # order to accomodate tg info which treats out-of-date items that are
1112 # only in the base as already being in the head for status purposes.
1113 # It will also return non-zero status if NAME needs update.
1114 # If needs_update() hits missing dependencies, it will append
1115 # them to space-separated $missing_deps list and skip them.
1116 needs_update()
1117 {
1118         recurse_deps branch_needs_update "$1"
1119 }
1120
1121 # branch_empty NAME [-i | -w]
1122 branch_empty()
1123 {
1124         if [ -z "$2" ]; then
1125                 _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
1126                 _result=
1127                 _result_rev=
1128                 { read -r _result _result_rev <"$tg_cache_dir/refs/heads/$1/.mt"; } 2>/dev/null || :
1129                 [ -z "$_result" -o "$_result_rev" != "$_rev" ] || return $_result
1130                 _result=0
1131                 [ "$(pretty_tree -t "$1" -b)" = "$(pretty_tree -t "$1" $2)" ] || _result=$?
1132                 [ -d "$tg_cache_dir/refs/heads/$1" ] || mkdir -p "$tg_cache_dir/refs/heads/$1" 2>/dev/null
1133                 [ ! -d "$tg_cache_dir/refs/heads/$1" ] || echo $_result $_rev >"$tg_cache_dir/refs/heads/$1/.mt"
1134                 return $_result
1135         else
1136                 [ "$(pretty_tree -t "$1" -b)" = "$(pretty_tree -t "$1" $2)" ]
1137         fi
1138 }
1139
1140 # list_deps [-i | -w] [BRANCH]
1141 # -i/-w apply only to HEAD
1142 list_deps()
1143 {
1144         head_from=
1145         [ "$1" != "-i" -a "$1" != "-w" ] || { head_from="$1"; shift; }
1146         head="$(git symbolic-ref -q HEAD)" ||
1147                 head="..detached.."
1148
1149         git for-each-ref --format='%(objectname) %(refname)' "refs/$topbases${1:+/$1}" |
1150                 while read rev ref; do
1151                         name="${ref#refs/$topbases/}"
1152                         if branch_annihilated "$name" "" "$rev"; then
1153                                 continue
1154                         fi
1155
1156                         from=$head_from
1157                         [ "refs/heads/$name" = "$head" ] ||
1158                                 from=
1159                         cat_file "refs/heads/$name:.topdeps" $from | while read dep; do
1160                                 dep_is_tgish=true
1161                                 ref_exists "refs/$topbases/$dep" ||
1162                                         dep_is_tgish=false
1163                                 if ! "$dep_is_tgish" || ! branch_annihilated $dep; then
1164                                         echo "$name $dep"
1165                                 fi
1166                         done
1167                 done
1168 }
1169
1170 # checkout_symref_full [-f] FULLREF [SEED]
1171 # Just like git checkout $iowopt -b FULLREF [SEED] except that FULLREF MUST start with
1172 # refs/ and HEAD is ALWAYS set to a symref to it and [SEED] (default is FULLREF)
1173 # MUST be a committish which if present will be used instead of current FULLREF
1174 # (and FULLREF will be updated to it as well in that case)
1175 # Any merge state is always cleared by this function
1176 # With -f it's like git checkout $iowopt -f -b FULLREF (uses read-tree --reset
1177 # instead of -m) but it will clear out any unmerged entries
1178 # As an extension, FULLREF may also be a full hash to create a detached HEAD instead
1179 checkout_symref_full()
1180 {
1181         _mode=-m
1182         _head="HEAD"
1183         if [ "$1" = "-f" ]; then
1184                 _mode="--reset"
1185                 _head=
1186                 shift
1187         fi
1188         _ishash=
1189         case "$1" in
1190                 refs/?*)
1191                         ;;
1192                 $octet20)
1193                         _ishash=1
1194                         [ -z "$2" ] || [ "$1" = "$2" ] ||
1195                                 die "programmer error: invalid checkout_symref_full \"$1\" \"$2\""
1196                         set -- HEAD "$1"
1197                         ;;
1198                 *)
1199                         die "programmer error: invalid checkout_symref_full \"$1\""
1200                         ;;
1201         esac
1202         _seedrev="$(git rev-parse --quiet --verify "${2:-$1}^0" --)" ||
1203                 die "invalid committish: \"${2:-$1}\""
1204         # Clear out any MERGE_HEAD kruft
1205         rm -f "$git_dir/MERGE_HEAD" || :
1206         # We have to do all the hard work ourselves :/
1207         # This is like git checkout -b "$1" "$2"
1208         # (or just git checkout "$1"),
1209         # but never creates a detached HEAD (unless $1 is a hash)
1210         git read-tree -u $_mode $_head "$_seedrev" &&
1211         {
1212                 [ -z "$2" ] && [ "$(git cat-file -t "$1")" = "commit" ] ||
1213                 git update-ref ${_ishash:+--no-deref} "$1" "$_seedrev"
1214         } && {
1215                 [ -n "$_ishash" ] || git symbolic-ref HEAD "$1"
1216         }
1217 }
1218
1219 # switch_to_base NAME [SEED]
1220 switch_to_base()
1221 {
1222         checkout_symref_full "refs/$topbases/$1" "$2"
1223 }
1224
1225 # run editor with arguments
1226 # the editor setting will be cached in $tg_editor (which is eval'd)
1227 # result non-zero if editor fails or GIT_EDITOR cannot be determined
1228 run_editor()
1229 {
1230         tg_editor="$GIT_EDITOR"
1231         [ -n "$tg_editor" ] || tg_editor="$(git var GIT_EDITOR)" || return $?
1232         eval "$tg_editor" '"$@"'
1233 }
1234
1235 # Show the help messages.
1236 do_help()
1237 {
1238         _www=
1239         if [ "$1" = "-w" ]; then
1240                 _www=1
1241                 shift
1242         fi
1243         if [ -z "$1" ] ; then
1244                 # This is currently invoked in all kinds of circumstances,
1245                 # including when the user made a usage error. Should we end up
1246                 # providing more than a short help message, then we should
1247                 # differentiate.
1248                 # Petr's comment: http://marc.info/?l=git&m=122718711327376&w=2
1249
1250                 ## Build available commands list for help output
1251
1252                 cmds=
1253                 sep=
1254                 for cmd in "$TG_INST_CMDDIR"/tg-[!-]*; do
1255                         ! [ -r "$cmd" ] && continue
1256                         # strip directory part and "tg-" prefix
1257                         cmd="${cmd##*/}"
1258                         cmd="${cmd#tg-}"
1259                         [ "$cmd" != "migrate-bases" ] || continue
1260                         [ "$cmd" != "summary" ] || cmd="st[atus]|$cmd"
1261                         cmds="$cmds$sep$cmd"
1262                         sep="|"
1263                 done
1264
1265                 echo "TopGit version $TG_VERSION - A different patch queue manager"
1266                 echo "Usage: $tgname [-C <dir>] [-r <remote> | -u] [-c <name>=<val>] ($cmds) ..."
1267                 echo "   Or: $tgname help [-w] [<command>]"
1268                 echo "Use \"$tgdisplaydir$tgname help tg\" for overview of TopGit"
1269         elif [ -r "$TG_INST_CMDDIR"/tg-$1 -o -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1270                 if [ -n "$_www" ]; then
1271                         nohtml=
1272                         if ! [ -r "$TG_INST_SHAREDIR/topgit.html" ]; then
1273                                 echo "${0##*/}: missing html help file:" \
1274                                         "$TG_INST_SHAREDIR/topgit.html" 1>&2
1275                                 nohtml=1
1276                         fi
1277                         if ! [ -r "$TG_INST_SHAREDIR/tg-$1.html" ]; then
1278                                 echo "${0##*/}: missing html help file:" \
1279                                         "$TG_INST_SHAREDIR/tg-$1.html" 1>&2
1280                                 nohtml=1
1281                         fi
1282                         if [ -n "$nohtml" ]; then
1283                                 echo "${0##*/}: use" \
1284                                         "\"${0##*/} help $1\" instead" 1>&2
1285                                 exit 1
1286                         fi
1287                         git web--browse -c help.browser "$TG_INST_SHAREDIR/tg-$1.html"
1288                         exit
1289                 fi
1290                 output()
1291                 {
1292                         if [ -r "$TG_INST_CMDDIR"/tg-$1 ] ; then
1293                                 "$TG_INST_CMDDIR"/tg-$1 -h 2>&1 || :
1294                                 echo
1295                         elif [ "$1" = "help" ]; then
1296                                 echo "Usage: ${tgname:-tg} help [-w] [<command>]"
1297                                 echo
1298                         elif [ "$1" = "status" ] || [ "$1" = "st" ]; then
1299                                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1300                                 echo
1301                         fi
1302                         if [ -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1303                                 cat "$TG_INST_SHAREDIR/tg-$1.txt"
1304                         fi
1305                 }
1306                 page output "$1"
1307         else
1308                 echo "${0##*/}: no help for $1" 1>&2
1309                 do_help
1310                 exit 1
1311         fi
1312 }
1313
1314 check_status()
1315 {
1316         git_state=
1317         git_remove=
1318         if [ -e "$git_dir/MERGE_HEAD" ]; then
1319                 git_state="merge"
1320         elif [ -e "$git_dir/rebase-apply/applying" ]; then
1321                 git_state="am"
1322                 git_remove="$git_dir/rebase-apply"
1323         elif [ -e "$git_dir/rebase-apply" ]; then
1324                 git_state="rebase"
1325                 git_remove="$git_dir/rebase-apply"
1326         elif [ -e "$git_dir/rebase-merge" ]; then
1327                 git_state="rebase"
1328                 git_remove="$git_dir/rebase-merge"
1329         elif [ -e "$git_dir/CHERRY_PICK_HEAD" ]; then
1330                 git_state="cherry-pick"
1331         elif [ -e "$git_dir/BISECT_LOG" ]; then
1332                 git_state="bisect"
1333         elif [ -e "$git_dir/REVERT_HEAD" ]; then
1334                 git_state="revert"
1335         fi
1336         git_remove="${git_remove#./}"
1337
1338         tg_state=
1339         tg_remove=
1340         tg_topmerge=
1341         if [ -e "$git_dir/tg-update" ]; then
1342                 tg_state="update"
1343                 tg_remove="$git_dir/tg-update"
1344                 ! [ -s "$git_dir/tg-update/merging_topfiles" ] || tg_topmerge=1
1345         fi
1346         tg_remove="${tg_remove#./}"
1347 }
1348
1349 # Show status information
1350 do_status()
1351 {
1352         do_status_result=0
1353         do_status_verbose=
1354         do_status_help=
1355         abbrev=refs
1356         pfx=
1357         while [ $# -gt 0 ] && case "$1" in
1358                 --help|-h)
1359                         do_status_help=1
1360                         break;;
1361                 -vv)
1362                         # kludge in this common bundling option
1363                         abbrev=
1364                         do_status_verbose=1
1365                         pfx="## "
1366                         ;;
1367                 --verbose|-v)
1368                         [ -z "$do_status_verbose" ] || abbrev=
1369                         do_status_verbose=1
1370                         pfx="## "
1371                         ;;
1372                 --exit-code)
1373                         do_status_result=2
1374                         ;;
1375                 *)
1376                         die "unknown status argument: $1"
1377                         ;;
1378         esac; do shift; done
1379         if [ -n "$do_status_help" ]; then
1380                 echo "Usage: ${tgname:-tg} @tgsthelpusage@"
1381                 return
1382         fi
1383         check_status
1384         symref="$(git symbolic-ref --quiet HEAD)" || :
1385         headrv="$(git rev-parse --quiet --verify ${abbrev:+--short} HEAD --)" || :
1386         if [ -n "$symref" ]; then
1387                 uprefpart=
1388                 if [ -n "$headrv" ]; then
1389                         upref="$(git rev-parse --symbolic-full-name @{upstream} 2>/dev/null)" || :
1390                         if [ -n "$upref" ]; then
1391                                 uprefpart=" ... ${upref#$abbrev/remotes/}"
1392                                 mbase="$(git merge-base HEAD "$upref")" || :
1393                                 ahead="$(git rev-list --count HEAD ${mbase:+--not $mbase})" || ahead=0
1394                                 behind="$(git rev-list --count "$upref" ${mbase:+--not $mbase})" || behind=0
1395                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart ["
1396                                 [ "$ahead" = "0" ] || uprefpart="${uprefpart}ahead $ahead"
1397                                 [ "$ahead" = "0" ] || [ "$behind" = "0" ] || uprefpart="$uprefpart, "
1398                                 [ "$behind" = "0" ] || uprefpart="${uprefpart}behind $behind"
1399                                 [ "$ahead$behind" = "00" ] || uprefpart="$uprefpart]"
1400                         fi
1401                 fi
1402                 echol "${pfx}HEAD -> ${symref#$abbrev/heads/} [${headrv:-unborn}]$uprefpart"
1403         else
1404                 echol "${pfx}HEAD -> ${headrv:-?}"
1405         fi
1406         if [ -n "$tg_state" ]; then
1407                 extra=
1408                 if [ "$tg_state" = "update" ]; then
1409                         IFS= read -r uname <"$git_dir/tg-update/name" || :
1410                         [ -z "$uname" ] ||
1411                         extra="; currently updating branch '$uname'"
1412                 fi
1413                 echol "${pfx}tg $tg_state in progress$extra"
1414                 if [ -s "$git_dir/tg-update/fullcmd" ] && [ -s "$git_dir/tg-update/names" ]; then
1415                         printf "${pfx}You are currently updating as a result of:\n${pfx}  "
1416                         cat "$git_dir/tg-update/fullcmd"
1417                         bcnt="$(( $(wc -w < "$git_dir/tg-update/names") ))"
1418                         if [ $bcnt -gt 1 ]; then
1419                                 pcnt=0
1420                                 ! [ -s "$git_dir/tg-update/processed" ] ||
1421                                 pcnt="$(( $(wc -w < "$git_dir/tg-update/processed") ))"
1422                                 echo "${pfx}$pcnt of $bcnt branches updated so far"
1423                         fi
1424                 fi
1425                 if [ "$tg_state" = "update" ]; then
1426                         echol "${pfx}  (use \"$tgdisplayac update --continue\" to continue)"
1427                         echol "${pfx}  (use \"$tgdisplayac update --skip\" to skip this branch and continue)"
1428                         echol "${pfx}  (use \"$tgdisplayac update --stop\" to stop and retain changes so far)"
1429                         echol "${pfx}  (use \"$tgdisplayac update --abort\" to restore pre-update state)"
1430                 fi
1431         fi
1432         [ -z "$git_state" ] || echo "${pfx}git $git_state in progress"
1433         if [ "$git_state" = "merge" ]; then
1434                 ucnt="$(( $(git ls-files --unmerged --full-name --abbrev :/ | wc -l) ))"
1435                 if [ $ucnt -gt 0 ]; then
1436                         echo "${pfx}"'fix conflicts and then "git commit" the result'
1437                 else
1438                         echo "${pfx}"'all conflicts fixed; run "git commit" to record result'
1439                 fi
1440         fi
1441         if [ -z "$git_state" ]; then
1442                 gsp="$(git status --porcelain 2>/dev/null)" || return 0 # bare repository
1443                 gspcnt=0
1444                 [ -z "$gsp" ] ||
1445                 gspcnt="$(( $(printf '%s\n' "$gsp" | sed -n '/^??/!p' | wc -l) ))"
1446                 untr=
1447                 if [ "$gspcnt" -eq 0 ]; then
1448                         [ -z "$gsp" ] || untr="; non-ignored, untracked files present"
1449                         echo "${pfx}working directory is clean$untr"
1450                         [ -n "$tg_state" ] || do_status_result=0
1451                 else
1452                         echo "${pfx}working directory is DIRTY"
1453                         [ -z "$do_status_verbose" ] || git status --short --untracked-files=no
1454                 fi
1455         fi
1456 }
1457
1458 ## Pager stuff
1459
1460 # isatty FD
1461 isatty()
1462 {
1463         test -t $1
1464 }
1465
1466 # pass "diff" to get pager.diff
1467 # if pager.$1 is a boolean false returns cat
1468 # if set to true or unset fails
1469 # otherwise succeeds and returns the value
1470 get_pager()
1471 {
1472         if _x="$(git config --bool "pager.$1" 2>/dev/null)"; then
1473                 [ "$_x" != "true" ] || return 1
1474                 echo "cat"
1475                 return 0
1476         fi
1477         if _x="$(git config "pager.$1" 2>/dev/null)"; then
1478                 echol "$_x"
1479                 return 0
1480         fi
1481         return 1
1482 }
1483
1484 # setup_pager
1485 # Set TG_PAGER to a valid executable
1486 # After calling, code to be paged should be surrounded with {...} | eval "$TG_PAGER"
1487 # See also the following "page" function for ease of use
1488 # emptypager will be set to 1 (otherwise empty) if TG_PAGER was set to "cat" to not be empty
1489 # Preference is (same as Git):
1490 #   1. GIT_PAGER
1491 #   2. pager.$USE_PAGER_TYPE (but only if USE_PAGER_TYPE is set and so is pager.$USE_PAGER_TYPE)
1492 #   3. core.pager (only if set)
1493 #   4. PAGER
1494 #   5. git var GIT_PAGER
1495 #   6. less
1496 setup_pager()
1497 {
1498         isatty 1 || { emptypager=1; TG_PAGER=cat; return 0; }
1499
1500         emptypager=
1501         if [ -z "$TG_PAGER_IN_USE" ]; then
1502                 # TG_PAGER = GIT_PAGER | PAGER | less
1503                 # NOTE: GIT_PAGER='' is significant
1504                 if [ -n "${GIT_PAGER+set}" ]; then
1505                         TG_PAGER="$GIT_PAGER"
1506                 elif [ -n "$USE_PAGER_TYPE" ] && _dp="$(get_pager "$USE_PAGER_TYPE")"; then
1507                         TG_PAGER="$_dp"
1508                 elif _cp="$(git config core.pager 2>/dev/null)"; then
1509                         TG_PAGER="$_cp"
1510                 elif [ -n "${PAGER+set}" ]; then
1511                         TG_PAGER="$PAGER"
1512                 else
1513                         _gp="$(git var GIT_PAGER 2>/dev/null)" || :
1514                         [ "$_gp" != ":" ] || _gp=
1515                         TG_PAGER="${_gp:-less}"
1516                 fi
1517                 if [ -z "$TG_PAGER" ]; then
1518                         emptypager=1
1519                         TG_PAGER=cat
1520                 fi
1521         else
1522                 emptypager=1
1523                 TG_PAGER=cat
1524         fi
1525
1526         # Set pager default environment variables
1527         # see pager.c:setup_pager
1528         if [ -z "${LESS+set}" ]; then
1529                 LESS="-FRX"
1530                 export LESS
1531         fi
1532         if [ -z "${LV+set}" ]; then
1533                 LV="-c"
1534                 export LV
1535         fi
1536
1537         # this is needed so e.g. $(git diff) will still colorize it's output if
1538         # requested in ~/.gitconfig with color.diff=auto
1539         GIT_PAGER_IN_USE=1
1540         export GIT_PAGER_IN_USE
1541
1542         # this is needed so we don't get nested pagers
1543         TG_PAGER_IN_USE=1
1544         export TG_PAGER_IN_USE
1545 }
1546
1547 # page eval_arg [arg ...]
1548 #
1549 # Calls setup_pager then evals the first argument passing it all the rest
1550 # where the output is piped through eval "$TG_PAGER" unless emptypager is set
1551 # by setup_pager (in which case the output is left as-is).
1552 #
1553 # To handle arbitrary paging duties, collect lines to be paged into a
1554 # function and then call page with the function name or perhaps func_name "$@".
1555 #
1556 # If no arguments at all are passed in do nothing (return with success).
1557 page()
1558 {
1559         [ $# -gt 0 ] || return 0
1560         setup_pager
1561         _evalarg="$1"; shift
1562         if [ -n "$emptypager" ]; then
1563                 eval "$_evalarg" '"$@"'
1564         else
1565                 eval "$_evalarg" '"$@"' | eval "$TG_PAGER"
1566         fi
1567 }
1568
1569 # get_temp NAME [-d]
1570 # creates a new temporary file (or directory with -d) in the global
1571 # temporary directory $tg_tmp_dir with pattern prefix NAME
1572 get_temp()
1573 {
1574         mktemp $2 "$tg_tmp_dir/$1.XXXXXX"
1575 }
1576
1577 # automatically called by strftime
1578 # does nothing if already setup
1579 # may be called explicitly if the first call would otherwise be in a subshell
1580 # so that the setup is only done once before subshells start being spawned
1581 setup_strftime()
1582 {
1583         [ -z "$strftime_is_setup" ] || return 0
1584
1585         # date option to format raw epoch seconds values
1586         daterawopt=
1587         _testes='951807788'
1588         _testdt='2000-02-29 07:03:08 UTC'
1589         _testfm='%Y-%m-%d %H:%M:%S %Z'
1590         if [ "$(TZ=UTC date "-d@$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1591                 daterawopt='-d@'
1592         elif [ "$(TZ=UTC date "-r$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1593                 daterawopt='-r'
1594         fi
1595         strftime_is_setup=1
1596 }
1597
1598 # $1 => strftime format string to use
1599 # $2 => raw timestamp as seconds since epoch
1600 # $3 => optional time zone string (empty/absent for local time zone)
1601 strftime()
1602 {
1603         setup_strftime
1604         if [ -n "$daterawopt" ]; then
1605                 if [ -n "$3" ]; then
1606                         TZ="$3" date "$daterawopt$2" "+$1"
1607                 else
1608                         date "$daterawopt$2" "+$1"
1609                 fi
1610         else
1611                 if [ -n "$3" ]; then
1612                         TZ="$3" perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1613                 else
1614                         perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1615                 fi
1616         fi
1617 }
1618
1619 got_cdup_result=
1620 git_cdup_result=
1621 v_get_show_cdup()
1622 {
1623         if [ -z "$got_cdup_result" ]; then
1624                 git_cdup_result="$(git rev-parse --show-cdup)"
1625                 got_cdup_result=1
1626         fi
1627         [ -z "$1" ] || eval "$1="'"$git_cdup_result"'
1628 }
1629
1630 setup_git_dirs()
1631 {
1632         [ -n "$git_dir" ] || git_dir="$(git rev-parse --git-dir)"
1633         if [ -n "$git_dir" ] && [ -d "$git_dir" ]; then
1634                 git_dir="$(cd "$git_dir" && pwd)"
1635         fi
1636         if [ -z "$git_common_dir" ]; then
1637                 if vcmp "$git_version" '>=' "2.5"; then
1638                         # rev-parse --git-common-dir is broken and may give
1639                         # an incorrect result unless the current directory is
1640                         # already set to the top level directory
1641                         v_get_show_cdup
1642                         git_common_dir="$(cd "./$git_cdup_result" && cd "$(git rev-parse --git-common-dir)" && pwd)"
1643                 else
1644                         git_common_dir="$git_dir"
1645                 fi
1646         fi
1647         [ -n "$git_dir" ] && [ -n "$git_common_dir" ] &&
1648         [ -d "$git_dir" ] && [ -d "$git_common_dir" ] || die "Not a git repository"
1649         git_hooks_dir="$git_common_dir/hooks"
1650         if vcmp "$git_version" '>=' "2.9" && gchp="$(git config --path --get core.hooksPath 2>/dev/null)" && [ -n "$gchp" ]; then
1651                 case "$gchp" in
1652                         /[!/]*)
1653                                 git_hooks_dir="$gchp"
1654                                 ;;
1655                         *)
1656                                 [ -n "$1" ] || warn "ignoring non-absolute core.hooksPath: $gchp"
1657                                 ;;
1658                 esac
1659                 unset gchp
1660         fi
1661 }
1662
1663 basic_setup()
1664 {
1665         setup_git_dirs $1
1666         if [ -z "$base_remote" ]; then
1667                 if [ "${TG_EXPLICIT_REMOTE+set}" = "set" ]; then
1668                         base_remote="$TG_EXPLICIT_REMOTE"
1669                 else
1670                         base_remote="$(git config topgit.remote 2>/dev/null)" || :
1671                 fi
1672         fi
1673         tgsequester="$(git config --bool topgit.sequester 2>/dev/null)" || :
1674         tgnosequester=
1675         [ "$tgsequester" != "false" ] || tgnosequester=1
1676         unset tgsequester
1677
1678         # catch errors if topbases is used without being set
1679         unset tg_topbases_set
1680         topbases="programmer*:error"
1681         topbasesrx="programmer*:error}"
1682         oldbases="$topbases"
1683 }
1684
1685 ## Initial setup
1686 initial_setup()
1687 {
1688         # suppress the merge log editor feature since git 1.7.10
1689
1690         GIT_MERGE_AUTOEDIT=no
1691         export GIT_MERGE_AUTOEDIT
1692
1693         basic_setup $1
1694         iowopt=
1695         ! vcmp "$git_version" '>=' "2.5" || iowopt="--ignore-other-worktrees"
1696         gcfbopt=
1697         ! vcmp "$git_version" '>=' "2.6" || gcfbopt="--buffer"
1698         auhopt=
1699         ! vcmp "$git_version" '>=' "2.9" || auhopt="--allow-unrelated-histories"
1700         v_get_show_cdup root_dir
1701         root_dir="${root_dir:-.}"
1702         logrefupdates="$(git config --bool core.logallrefupdates 2>/dev/null)" || :
1703         [ "$logrefupdates" = "true" ] || logrefupdates=
1704
1705         # make sure root_dir doesn't end with a trailing slash.
1706
1707         root_dir="${root_dir%/}"
1708
1709         # create global temporary directories, inside GIT_DIR
1710
1711         tg_tmp_dir=
1712         trap 'rm -rf "$tg_tmp_dir"' EXIT
1713         trap 'exit 129' HUP
1714         trap 'exit 130' INT
1715         trap 'exit 131' QUIT
1716         trap 'exit 134' ABRT
1717         trap 'exit 143' TERM
1718         tg_tmp_dir="$(mktemp -d "$git_dir/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1719         [ -n "$tg_tmp_dir" ] || tg_tmp_dir="$(mktemp -d "${TMPDIR:-/tmp}/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1720         [ -n "$tg_tmp_dir" ] || [ -z "$TMPDIR" ] || tg_tmp_dir="$(mktemp -d "/tmp/tg-tmp.XXXXXX" 2>/dev/null)" || tg_tmp_dir=
1721         tg_ref_cache="$tg_tmp_dir/tg~ref-cache"
1722         tg_ref_cache_br="$tg_ref_cache.br"
1723         tg_ref_cache_rbr="$tg_ref_cache.rbr"
1724         tg_ref_cache_ann="$tg_ref_cache.ann"
1725         tg_ref_cache_dep="$tg_ref_cache.dep"
1726         [ -n "$tg_tmp_dir" ] && [ -w "$tg_tmp_dir" ] && { >"$tg_ref_cache"; } >/dev/null 2>&1 ||
1727                 die "could not create a writable temporary directory"
1728
1729         # make sure global cache directory exists inside GIT_DIR or $tg_tmp_dir
1730
1731         user_id_no="$(id -u)" || :
1732         : "${user_id_no:=_99_}"
1733         tg_cache_dir="$git_common_dir/tg-cache"
1734         [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1735         [ -z "$tg_cache_dir" ] || tg_cache_dir="$tg_cache_dir/$user_id_no"
1736         [ -z "$tg_cache_dir" ] || [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1737         [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
1738         if [ -z "$tg_cache_dir" ]; then
1739                 tg_cache_dir="$tg_tmp_dir/tg-cache"
1740                 [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir" >/dev/null 2>&1 || tg_cache_dir=
1741                 [ -z "$tg_cache_dir" ] || { >"$tg_cache_dir/.tgcache"; } >/dev/null 2>&1 || tg_cache_dir=
1742         fi
1743         [ -n "$tg_cache_dir" ] ||
1744                 die "could not create a writable tg-cache directory (even a temporary one)"
1745
1746         # GIT_ALTERNATE_OBJECT_DIRECTORIES can contain double-quoted entries
1747         # since Git v2.11.1; however, it's only necessary for : (or perhaps ;)
1748         # so we avoid it if possible and require v2.11.1 to do it at all
1749         # otherwise just don't make an alternates temporary store in that case;
1750         # it's okay to not have one; everything will still work; the nicety of
1751         # making the temporary tree objects vanish when tg exits just won't
1752         # happen in that case but nothing will break also be sure to reuse
1753         # the parent's if we've been recursively invoked and it's for the
1754         # same repository we were invoked on
1755
1756         tg_use_alt_odb=1
1757         _odbdir="${GIT_OBJECT_DIRECTORY:-$git_common_dir/objects}"
1758         [ -n "$_odbdir" ] && [ -d "$_odbdir" ] || tg_use_alt_odb=
1759         _fulltmpdir=
1760         [ -z "$tg_use_alt_odb" ] || _fulltmpdir="$(cd "$tg_tmp_dir" && pwd -P)"
1761         case "$_fulltmpdir" in *[";:"]*) vcmp "$git_version" '>=' "2.11.1" || tg_use_alt_odb=; esac
1762         _fullodbdir=
1763         [ -z "$tg_use_alt_odb" ] || _fullodbdir="$(cd "$_odbdir" && pwd -P)"
1764         if [ -n "$tg_use_alt_odb" ] && [ -n "$TG_OBJECT_DIRECTORY" ] && [ -d "$TG_OBJECT_DIRECTORY/info" ] &&
1765            [ -f "$TG_OBJECT_DIRECTORY/info/alternates" ] && [ -r "$TG_OBJECT_DIRECTORY/info/alternates" ]; then
1766                 if IFS= read -r _otherodbdir <"$TG_OBJECT_DIRECTORY/info/alternates" &&
1767                    [ -n "$_otherodbdir" ] && [ "$_otherodbdir" = "$_fullodbdir" ]; then
1768                         tg_use_alt_odb=2
1769                 fi
1770         fi
1771         if [ "$tg_use_alt_odb" = "1" ]; then
1772                 # create an alternate objects database to keep the ephemeral objects in
1773                 mkdir -p "$tg_tmp_dir/objects/info"
1774                 echol "$_fullodbdir" >"$tg_tmp_dir/objects/info/alternates"
1775                 TG_OBJECT_DIRECTORY="$_fulltmpdir/objects"
1776                 case "$TG_OBJECT_DIRECTORY" in
1777                         *[";:"]*)
1778                                 # surround in "..." and backslash-escape internal '"' and '\\'
1779                                 _altodbdq="\"$(printf '%s\n' "$TG_OBJECT_DIRECTORY" |
1780                                         sed 's/\([""\\]\)/\\\1/g')\""
1781                                 ;;
1782                         *)
1783                                 _altodbdq="$TG_OBJECT_DIRECTORY"
1784                                 ;;
1785                 esac
1786                 TG_PRESERVED_ALTERNATES="$GIT_ALTERNATE_OBJECT_DIRECTORIES"
1787                 if [ -n "$GIT_ALTERNATE_OBJECT_DIRECTORIES" ]; then
1788                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq:$GIT_ALTERNATE_OBJECT_DIRECTORIES"
1789                 else
1790                         GIT_ALTERNATE_OBJECT_DIRECTORIES="$_altodbdq"
1791                 fi
1792                 export TG_PRESERVED_ALTERNATES TG_OBJECT_DIRECTORY GIT_ALTERNATE_OBJECT_DIRECTORIES GIT_OBJECT_DIRECTORY
1793         fi
1794 }
1795
1796 set_topbases()
1797 {
1798         # refer to "top-bases" in a refname with $topbases
1799
1800         [ -z "$tg_topbases_set" ] || return 0
1801
1802         topbases_implicit_default=1
1803         # See if topgit.top-bases is set to heads or refs
1804         tgtb="$(git config "topgit.top-bases" 2>/dev/null)" || :
1805         if [ -n "$tgtb" ] && [ "$tgtb" != "heads" ] && [ "$tgtb" != "refs" ]; then
1806                 if [ -n "$1" ]; then
1807                         # never die on the hook script
1808                         unset tgtb
1809                 else
1810                         die "invalid \"topgit.top-bases\" setting (must be \"heads\" or \"refs\")"
1811                 fi
1812         fi
1813         if [ -n "$tgtb" ]; then
1814                 case "$tgtb" in
1815                 heads)
1816                         topbases="heads/{top-bases}"
1817                         topbasesrx="heads/[{]top-bases[}]"
1818                         oldbases="top-bases";;
1819                 refs)
1820                         topbases="top-bases"
1821                         topbasesrx="top-bases"
1822                         oldbases="heads/{top-bases}";;
1823                 esac
1824                 # MUST NOT be exported
1825                 unset tgtb tg_topbases_set topbases_implicit_default
1826                 tg_topbases_set=1
1827                 return 0
1828         fi
1829         unset tgtb
1830
1831         # check heads and top-bases and see what state the current
1832         # repository is in.  remotes are ignored.
1833
1834         hblist=" "
1835         topbases=
1836         both=
1837         newtb="heads/{top-bases}"
1838         while read -r rn && [ -n "$rn" ]; do case "$rn" in
1839                 "refs/heads/{top-bases}"/*)
1840                         case "$hblist" in *" ${rn#refs/$newtb/} "*)
1841                                 if [ "$topbases" != "heads/{top-bases}" ] && [ -n "$topbases" ]; then
1842                                         both=1
1843                                         break;
1844                                 else
1845                                         topbases="heads/{top-bases}"
1846                                         topbasesrx="heads/[{]top-bases[}]"
1847                                         oldbases="top-bases"
1848                                 fi
1849                         esac;;
1850                 "refs/top-bases"/*)
1851                         case "$hblist" in *" ${rn#refs/top-bases/} "*)
1852                                 if [ "$topbases" != "top-bases" ] && [ -n "$topbases" ]; then
1853                                         both=1
1854                                         break;
1855                                 else
1856                                         topbases="top-bases"
1857                                         topbasesrx="top-bases"
1858                                         oldbases="heads/{top-bases}"
1859                                 fi
1860                         esac;;
1861                 "refs/heads"/*)
1862                         hblist="$hblist${rn#refs/heads/} ";;
1863         esac; done <<-EOT
1864                 $(git for-each-ref --format='%(refname)' "refs/heads" "refs/top-bases" 2>/dev/null)
1865         EOT
1866         if [ -n "$both" ]; then
1867                 if [ -n "$1" ]; then
1868                         # hook script always prefers newer without complaint
1869                         topbases="heads/{top-bases}"
1870                         topbasesrx="heads/[{]top-bases[}]"
1871                         oldbases="top-bases"
1872                 else
1873                         # Complain and die
1874                         err "repository contains existing TopGit branches"
1875                         err "but some use refs/top-bases/... for the base"
1876                         err "and some use refs/heads/{top-bases}/... for the base"
1877                         err "with the latter being the new, preferred location"
1878                         err "set \"topgit.top-bases\" to either \"heads\" to use"
1879                         err "the new heads/{top-bases} location or \"refs\" to use"
1880                         err "the old top-bases location."
1881                         err "(the tg migrate-bases command can also resolve this issue)"
1882                         die "schizophrenic repository requires topgit.top-bases setting"
1883                 fi
1884         elif [ -n "$topbases" ]; then
1885                 unset topbases_implicit_default
1886         fi
1887
1888         [ -n "$topbases" ] || {
1889                 # default is still top-bases for now
1890                 topbases="top-bases"
1891                 topbasesrx="top-bases"
1892                 oldbases="heads/{top-bases}"
1893         }
1894         # MUST NOT be exported
1895         unset hblist both newtb rn tg_topases_set
1896         tg_topbases_set=1
1897         return 0
1898 }
1899
1900 # init_reflog "ref"
1901 # if "$logrefupdates" is set and ref is not under refs/heads/ then force
1902 # an empty log file to exist so that ref changes will be logged
1903 # "$1" must be a fully-qualified refname (i.e. start with "refs/")
1904 # However, if "$1" is "refs/tgstash" then always make the reflog
1905 # The only ref not under refs/ that Git will write a reflog for is HEAD;
1906 # no matter what, it will NOT update a reflog for any other bare refs so
1907 # just quietly succeed when passed TG_STASH without doing anything.
1908 init_reflog()
1909 {
1910         [ -n "$1" ] && [ "$1" != "TG_STASH" ] || return 0
1911         [ -n "$logrefupdates" ] || [ "$1" = "refs/tgstash" ] || return 0
1912         case "$1" in refs/heads/*|HEAD) return 0;; refs/*[!/]);; *) return 1; esac
1913         mkdir -p "$git_common_dir/logs/${1%/*}" 2>/dev/null || :
1914         { >>"$git_common_dir/logs/$1" || :; } 2>/dev/null
1915  }
1916
1917 # store the "realpath" for "$2" in "$1" except the leaf is not resolved if it's
1918 # a symbolic link.  The directory part must exist, but the basename need not.
1919 v_get_abs_path()
1920 {
1921         [ -n "$1" ] && [ -n "$2" ] || return 1
1922         set -- "$1" "$2" "${2%/}"
1923         case "$3" in
1924                 */*) set -- "$1" "$2" "${3%/*}";;
1925                 *  ) set -- "$1" "$2" ".";;
1926         esac
1927         case "$2" in */)
1928                 set -- "$1" "${2%/}" "$3" "/"
1929         esac
1930         [ -d "$3" ] || return 1
1931         eval "$1="'"$(cd "$3" && pwd -P)/${2##*/}$4"'
1932 }
1933
1934 ## Startup
1935
1936 : "${TG_INST_CMDDIR:=@cmddir@}"
1937 : "${TG_INST_SHAREDIR:=@sharedir@}"
1938 : "${TG_INST_HOOKSDIR:=@hooksdir@}"
1939
1940 [ -d "$TG_INST_CMDDIR" ] ||
1941         die "No command directory: '$TG_INST_CMDDIR'"
1942
1943 ## Include awk scripts and their utility functions (separated for easier debugging)
1944
1945 [ -f "$TG_INST_CMDDIR/tg--awksome" ] && [ -r "$TG_INST_CMDDIR/tg--awksome" ] ||
1946         die "Missing awk scripts: '$TG_INST_CMDDIR/tg--awksome'"
1947 . "$TG_INST_CMDDIR/tg--awksome"
1948
1949 if [ -n "$tg__include" ]; then
1950
1951         # We were sourced from another script for our utility functions;
1952         # this is set by hooks.  Skip the rest of the file.  A simple return doesn't
1953         # work as expected in every shell.  See http://bugs.debian.org/516188
1954
1955         # ensure setup happens
1956
1957         initial_setup 1
1958         set_topbases 1
1959
1960 else
1961
1962         set -e
1963
1964         tgbin="$0"
1965         tgdir="${tgbin%/}"
1966         case "$tgdir" in */*);;*) tgdir="./$tgdir"; esac
1967         tgdir="${tgdir%/*}/"
1968         tgname="${tgbin##*/}"
1969         [ "$0" != "$tgname" ] || tgdir=""
1970
1971         # If tg contains a '/' but does not start with one then replace it with an absolute path
1972
1973         case "$0" in /*) ;; */*)
1974                 tgdir="$(cd "${0%/*}" && pwd -P)/"
1975                 tgbin="$tgdir$tgname"
1976         esac
1977
1978         # tgdisplay will include any explicit -C <dir> etc. options whereas tgname will not
1979         # tgdisplayac is the same as tgdisplay but without any -r or -u options (ac => abort/continue)
1980
1981         tgdisplaydir="$tgdir"
1982         tgdisplay="$tgbin"
1983         tgdisplayac="$tgdisplay"
1984         if
1985             v_get_abs_path _tgnameabs "$(cmd_path "$tgname")" &&
1986             _tgabs="$_tgnameabs" &&
1987             { [ "$tgbin" = "$tgname" ] || v_get_abs_path _tgabs "$tgbin"; } &&
1988             [ "$_tgabs" = "$_tgnameabs" ]
1989         then
1990                 tgdisplaydir=""
1991                 tgdisplay="$tgname"
1992                 tgdisplayac="$tgdisplay"
1993         fi
1994         [ -z "$_tgabs" ] || tgbin="$_tgabs"
1995         unset _tgabs _tgnameabs
1996
1997         tg() { command "$tgbin" "$@"; }
1998
1999         explicit_remote=
2000         explicit_dir=
2001         gitcdopt=
2002         noremote=
2003
2004         cmd=
2005         while :; do case "$1" in
2006
2007                 help|--help|-h)
2008                         cmd=help
2009                         shift
2010                         break;;
2011
2012                 status|--status)
2013                         cmd=status
2014                         shift
2015                         break;;
2016
2017                 --hooks-path)
2018                         cmd=hooks-path
2019                         shift
2020                         break;;
2021
2022                 --exec-path)
2023                         cmd=exec-path
2024                         shift
2025                         break;;
2026
2027                 --top-bases)
2028                         cmd=top-bases
2029                         shift
2030                         break;;
2031
2032                 -r)
2033                         shift
2034                         if [ -z "$1" ]; then
2035                                 echo "Option -r requires an argument." >&2
2036                                 do_help
2037                                 exit 1
2038                         fi
2039                         unset noremote
2040                         base_remote="$1"
2041                         explicit_remote="$base_remote"
2042                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -r $explicit_remote"
2043                         TG_EXPLICIT_REMOTE="$base_remote" && export TG_EXPLICIT_REMOTE
2044                         shift;;
2045
2046                 -u)
2047                         unset base_remote explicit_remote
2048                         noremote=1
2049                         tgdisplay="$tgdisplaydir$tgname$gitcdopt -u"
2050                         TG_EXPLICIT_REMOTE= && export TG_EXPLICIT_REMOTE
2051                         shift;;
2052
2053                 -C)
2054                         shift
2055                         if [ -z "$1" ]; then
2056                                 echo "Option -C requires an argument." >&2
2057                                 do_help
2058                                 exit 1
2059                         fi
2060                         cd "$1"
2061                         unset GIT_DIR GIT_COMMON_DIR
2062                         if [ -z "$explicit_dir" ]; then
2063                                 explicit_dir="$1"
2064                         else
2065                                 explicit_dir="$PWD"
2066                         fi
2067                         gitcdopt=" -C \"$explicit_dir\""
2068                         [ "$explicit_dir" != "." ] || explicit_dir="." gitcdopt=" -C ."
2069                         tgdisplay="$tgdisplaydir$tgname$gitcdopt"
2070                         tgdisplayac="$tgdisplay"
2071                         [ -z "$explicit_remote" ] || tgdisplay="$tgdisplay -r $explicit_remote"
2072                         [ -z "$noremote" ] || tgdisplay="$tgdisplay -u"
2073                         shift;;
2074
2075                 -c)
2076                         shift
2077                         if [ -z "$1" ]; then
2078                                 echo "Option -c requires an argument." >&2
2079                                 do_help
2080                                 exit 1
2081                         fi
2082                         param="'$(printf '%s\n' "$1" | sed "s/[']/'\\\\''/g")'"
2083                         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }$param"
2084                         export GIT_CONFIG_PARAMETERS
2085                         shift;;
2086
2087                 --)
2088                         shift
2089                         break;;
2090
2091                 -*)
2092                         echo "Invalid option $1 (subcommand options must appear AFTER the subcommand)." >&2
2093                         do_help
2094                         exit 1;;
2095
2096                 *)
2097                         break;;
2098
2099         esac; done
2100
2101         [ -n "$cmd" -o $# -lt 1 ] || { cmd="$1"; shift; }
2102
2103         ## Dispatch
2104
2105         [ -n "$cmd" ] || { do_help; exit 1; }
2106
2107         case "$cmd" in
2108
2109                 help)
2110                         do_help "$@"
2111                         exit 0;;
2112
2113                 status|st)
2114                         unset base_remote
2115                         basic_setup
2116                         set_topbases
2117                         do_status "$@"
2118                         exit ${do_status_result:-0};;
2119
2120                 hooks-path)
2121                         # Internal command
2122                         echol "$TG_INST_HOOKSDIR";;
2123
2124                 exec-path)
2125                         # Internal command
2126                         echol "$TG_INST_CMDDIR";;
2127
2128                 top-bases)
2129                         # Maintenance command
2130                         ! git rev-parse --git-dir >/dev/null 2>&1 || setup_git_dirs
2131                         set_topbases
2132                         echol "refs/$topbases";;
2133
2134                 *)
2135                         isutil=
2136                         case "$cmd" in index-merge-one-file)
2137                                 isutil="-"
2138                         esac
2139                         [ -r "$TG_INST_CMDDIR"/tg-$isutil$cmd ] || {
2140                                 looplevel="$TG_ALIAS_DEPTH"
2141                                 [ "${looplevel#[1-9]}" != "$looplevel" ] &&
2142                                 [ "${looplevel%%[!0-9]*}" = "$looplevel" ] ||
2143                                 looplevel=0
2144                                 tgalias="$(git config "topgit.alias.$cmd" 2>/dev/null)" || :
2145                                 [ -n "$tgalias" ] || {
2146                                         echo "Unknown subcommand: $cmd" >&2
2147                                         do_help
2148                                         exit 1
2149                                 }
2150                                 looplevel=$(( $looplevel + 1 ))
2151                                 [ $looplevel -le 10 ] || die "topgit.alias nesting level 10 exceeded"
2152                                 TG_ALIAS_DEPTH="$looplevel"
2153                                 export TG_ALIAS_DEPTH
2154                                 if [ "!${tgalias#?}" = "$tgalias" ]; then
2155                                         unset GIT_PREFIX
2156                                         if pfx="$(git rev-parse --show-prefix 2>/dev/null)"; then
2157                                                 GIT_PREFIX="$pfx"
2158                                                 export GIT_PREFIX
2159                                         fi
2160                                         cd "./$(git rev-parse --show-cdup 2>/dev/null)"
2161                                         exec @SHELL_PATH@ -c "${tgalias#?} \"\$@\"" @SHELL_PATH@ "$@"
2162                                 else
2163                                         eval 'exec "$tgbin"' "$tgalias" '"$@"'
2164                                 fi
2165                                 die "alias execution failed for: $tgalias"
2166                         }
2167                         unset TG_ALIAS_DEPTH
2168
2169                         showing_help=
2170                         if [ "$*" = "-h" ] || [ "$*" = "--help" ]; then
2171                                 showing_help=1
2172                         fi
2173
2174                         [ -n "$showing_help" ] || initial_setup
2175                         [ -z "$noremote" ] || unset base_remote
2176
2177                         nomergesetup="$showing_help"
2178                         case "$cmd" in base|contains|info|log|rebase|revert|summary|tag)
2179                                 # avoid merge setup where not necessary
2180
2181                                 nomergesetup=1
2182                         esac
2183
2184                         if [ -z "$nomergesetup" ]; then
2185                                 # make sure merging the .top* files will always behave sanely
2186
2187                                 setup_ours
2188                                 setup_hook "pre-commit"
2189                         fi
2190
2191                         # everything but rebase needs topbases set
2192                         carefully="$showing_help"
2193                         [ "$cmd" != "migrate-bases" ] || carefully=1
2194                         [ "$cmd" = "rebase" ] || set_topbases $carefully
2195
2196                         _use_ref_cache=
2197                         tg_read_only=1
2198                         case "$cmd$showing_help" in
2199                                 contains|export|info|summary|tag)
2200                                         _use_ref_cache=1;;
2201                                 annihilate|create|delete|depend|import|update)
2202                                         tg_use_alt_odb=
2203                                         tg_read_only=;;
2204                         esac
2205                         [ -z "$_use_ref_cache" ] || v_create_ref_cache
2206
2207                         fullcmd="${tgname:-tg} $cmd $*"
2208                         . "$TG_INST_CMDDIR"/tg-$isutil$cmd;;
2209         esac
2210
2211 fi