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=0.19.6
   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 tab='   '
  21 lf='
  22 '
  23
  24 ## Auxiliary functions
  25
  26 # Preserves current $? value while triggering a non-zero set -e exit if active
  27 # This works even for shells that sometimes fail to correctly trigger a -e exit
  28 check_exit_code()
  29 {
  30         return $?
  31 }
  32
  33 # This is the POSIX equivalent of which
  34 cmd_path()
  35 (
  36         { "unset" -f command unset unalias "$1"; } >/dev/null 2>&1 || :
  37         { "unalias" -a; } >/dev/null 2>&1 || :
  38         command -v "$1"
  39 )
  40
  41 # Output arguments without any possible interpretation
  42 # (Avoid misinterpretation of '\' characters or leading "-n", "-E" or "-e")
  43 echol()
  44 {
  45         printf '%s\n' "$*"
  46 }
  47
  48 info()
  49 {
  50         echol "${TG_RECURSIVE}${tgname:-tg}: $*"
  51 }
  52
  53 warn()
  54 {
  55         info "warning: $*" >&2
  56 }
  57
  58 err()
  59 {
  60         info "error: $*" >&2
  61 }
  62
  63 die()
  64 {
  65         info "fatal: $*" >&2
  66         exit 1
  67 }
  68
  69 # shift off first arg then return "$*" properly quoted in single-quotes
  70 # if $1 was '' output goes to stdout otherwise it's assigned to $1
  71 # the final \n, if any, is omitted from the result but any others are included
  72 v_quotearg()
  73 {
  74         _quotearg_v="$1"
  75         shift
  76         set -- "$_quotearg_v" \
  77         "sed \"s/'/'\\\\\\''/g;1s/^/'/;\\\$s/\\\$/'/;s/'''/'/g;1s/^''\\(.\\)/\\1/\"" "$*"
  78         unset _quotearg_v
  79         if [ -z "$3" ]; then
  80                 if [ -z "$1" ]; then
  81                         echo "''"
  82                 else
  83                         eval "$1=\"''\""
  84                 fi
  85         else
  86                 if [ -z "$1" ]; then
  87                         printf "%s$4" "$3" | eval "$2"
  88                 else
  89                         eval "$1="'"$(printf "%s$4" "$3" | eval "$2")"'
  90                 fi
  91         fi
  92 }
  93
  94 # same as v_quotearg except there's no extra $1 so output always goes to stdout
  95 quotearg()
  96 {
  97         v_quotearg '' "$@"
  98 }
  99
 100 vcmp()
 101 {
 102         # Compare $1 to $3 each of which must match ^[^0-9]*\d*(\.\d*)*.*$
 103         # where only the "\d*" parts in the regex participate in the comparison
 104         # Since EVERY string matches that regex this function is easy to use
 105         # An empty string ('') for $1 or $3 or any "\d*" part is treated as 0
 106         # $2 is a compare op '<', '<=', '=', '==', '!=', '>=', '>'
 107         # Return code is 0 for true, 1 for false (or unknown compare op)
 108         # There is NO difference in behavior between '=' and '=='
 109         # Note that "vcmp 1.8 == 1.8.0.0.0.0" correctly returns 0
 110         set -- "$1" "$2" "$3" "${1%%[0-9]*}" "${3%%[0-9]*}"
 111         set -- "${1#"$4"}" "$2" "${3#"$5"}"
 112         set -- "${1%%[!0-9.]*}" "$2" "${3%%[!0-9.]*}"
 113         while
 114                 vcmp_a_="${1%%.*}"
 115                 vcmp_b_="${3%%.*}"
 116                 [ "z$vcmp_a_" != "z" -o "z$vcmp_b_" != "z" ]
 117         do
 118                 if [ "${vcmp_a_:-0}" -lt "${vcmp_b_:-0}" ]; then
 119                         unset vcmp_a_ vcmp_b_
 120                         case "$2" in "<"|"<="|"!=") return 0; esac
 121                         return 1
 122                 elif [ "${vcmp_a_:-0}" -gt "${vcmp_b_:-0}" ]; then
 123                         unset vcmp_a_ vcmp_b_
 124                         case "$2" in ">"|">="|"!=") return 0; esac
 125                         return 1;
 126                 fi
 127                 vcmp_a_="${1#$vcmp_a_}"
 128                 vcmp_b_="${3#$vcmp_b_}"
 129                 set -- "${vcmp_a_#.}" "$2" "${vcmp_b_#.}"
 130         done
 131         unset vcmp_a_ vcmp_b_
 132         case "$2" in "="|"=="|"<="|">=") return 0; esac
 133         return 1
 134 }
 135
 136 precheck() {
 137         if ! git_version="$(git version)"; then
 138                 die "'git version' failed"
 139         fi
 140         case "$git_version" in [Gg]"it version "*);;*)
 141                 die "'git version' output does not start with 'git version '"
 142         esac
 143
 144         vcmp "$git_version" '>=' "$GIT_MINIMUM_VERSION" ||
 145                 die "git version >= $GIT_MINIMUM_VERSION required but found $git_version instead"
 146 }
 147
 148 case "$1" in version|--version|-V)
 149         echo "TopGit version $TG_VERSION"
 150         exit 0
 151 esac
 152
 153 precheck
 154 [ "$1" = "precheck" ] && exit 0
 155
 156
 157 cat_depsmsg_internal()
 158 {
 159         _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
 160         if [ -s "$tg_cache_dir/$1/.$2" ]; then
 161                 if read _rev_match && [ "$_rev" = "$_rev_match" ]; then
 162                         _line=
 163                         while IFS= read -r _line || [ -n "$_line" ]; do
 164                                 printf '%s\n' "$_line"
 165                         done
 166                         return 0
 167                 fi <"$tg_cache_dir/$1/.$2"
 168         fi
 169         [ -d "$tg_cache_dir/$1" ] || mkdir -p "$tg_cache_dir/$1" 2>/dev/null || :
 170         if [ -d "$tg_cache_dir/$1" ]; then
 171                 printf '%s\n' "$_rev" >"$tg_cache_dir/$1/.$2"
 172                 _line=
 173                 git cat-file blob "$_rev:.$2" 2>/dev/null |
 174                 while IFS= read -r _line || [ -n "$_line" ]; do
 175                         printf '%s\n' "$_line" >&3
 176                         printf '%s\n' "$_line"
 177                 done 3>>"$tg_cache_dir/$1/.$2"
 178         else
 179                 git cat-file blob "$_rev:.$2" 2>/dev/null
 180         fi
 181 }
 182
 183 # cat_deps BRANCHNAME
 184 # Caches result
 185 cat_deps()
 186 {
 187         cat_depsmsg_internal "$1" topdeps
 188 }
 189
 190 # cat_msg BRANCHNAME
 191 # Caches result
 192 cat_msg()
 193 {
 194         cat_depsmsg_internal "$1" topmsg
 195 }
 196
 197 # cat_file TOPIC:PATH [FROM]
 198 # cat the file PATH from branch TOPIC when FROM is empty.
 199 # FROM can be -i or -w, than the file will be from the index or worktree,
 200 # respectively. The caller should than ensure that HEAD is TOPIC, to make sense.
 201 cat_file()
 202 {
 203         path="$1"
 204         case "$2" in
 205         -w)
 206                 cat "$root_dir/${path#*:}"
 207                 ;;
 208         -i)
 209                 # ':file' means cat from index
 210                 git cat-file blob ":${path#*:}"
 211                 ;;
 212         '')
 213                 case "$path" in
 214                 refs/heads/*:.topdeps)
 215                         _temp="${path%:.topdeps}"
 216                         cat_deps "${_temp#refs/heads/}"
 217                         ;;
 218                 refs/heads/*:.topmsg)
 219                         _temp="${path%:.topmsg}"
 220                         cat_msg "${_temp#refs/heads/}"
 221                         ;;
 222                 *)
 223                         git cat-file blob "$path"
 224                         ;;
 225                 esac
 226                 ;;
 227         *)
 228                 die "Wrong argument to cat_file: '$2'"
 229                 ;;
 230         esac
 231 }
 232
 233 # get tree for the committed topic
 234 get_tree_()
 235 {
 236         echo "refs/heads/$1"
 237 }
 238
 239 # get tree for the base
 240 get_tree_b()
 241 {
 242         echo "refs/$topbases/$1"
 243 }
 244
 245 # get tree for the index
 246 get_tree_i()
 247 {
 248         git write-tree
 249 }
 250
 251 # get tree for the worktree
 252 get_tree_w()
 253 {
 254         i_tree=$(git write-tree)
 255         (
 256                 # the file for --index-output needs to sit next to the
 257                 # current index file
 258                 cd "$root_dir"
 259                 : ${GIT_INDEX_FILE:="$git_dir/index"}
 260                 TMP_INDEX="$(mktemp "${GIT_INDEX_FILE}-tg.XXXXXX")"
 261                 git read-tree -m $i_tree --index-output="$TMP_INDEX" &&
 262                 GIT_INDEX_FILE="$TMP_INDEX" &&
 263                 export GIT_INDEX_FILE &&
 264                 git diff --name-only -z HEAD |
 265                         git update-index -z --add --remove --stdin &&
 266                 git write-tree &&
 267                 rm -f "$TMP_INDEX"
 268         )
 269 }
 270
 271 # strip_ref "$(git symbolic-ref HEAD)"
 272 # Output will have a leading refs/heads/ or refs/$topbases/ stripped if present
 273 strip_ref()
 274 {
 275         case "$1" in
 276                 refs/"$topbases"/*)
 277                         echol "${1#refs/$topbases/}"
 278                         ;;
 279                 refs/heads/*)
 280                         echol "${1#refs/heads/}"
 281                         ;;
 282                 *)
 283                         echol "$1"
 284         esac
 285 }
 286
 287 # pretty_tree NAME [-b | -i | -w]
 288 # Output tree ID of a cleaned-up tree without tg's artifacts.
 289 # NAME will be ignored for -i and -w, but needs to be present
 290 pretty_tree()
 291 {
 292         name=$1
 293         source=${2#?}
 294         git ls-tree --full-tree "$(get_tree_$source "$name")" |
 295                 LC_ALL=C sed -ne '/     \.top.*$/!p' |
 296                 git mktree
 297 }
 298
 299 # return an empty-tree root commit -- date is either passed in or current
 300 # If passed in "$*" must be epochsecs followed by optional hhmm offset (+0000 default)
 301 # An invalid secs causes the current date to be used, an invalid zone offset
 302 # causes +0000 to be used
 303 make_empty_commit()
 304 (
 305         # the empty tree is guaranteed to always be there even in a repo with
 306         # zero objects, but for completeness we force it to exist as a real object
 307         SECS=
 308         read -r SECS ZONE JUNK <<-EOT || :
 309                 $*
 310                 EOT
 311         case "$SECS" in *[!0-9]*) SECS=; esac
 312         if [ -z "$SECS" ]; then
 313                 MTDATE="$(date '+%s %z')"
 314         else
 315                 case "$ZONE" in
 316                         -[01][0-9][0-5][0-9]|+[01][0-9][0-5][0-9])
 317                                 ;;
 318                         [01][0-9][0-5][0-9])
 319                                 ZONE="+$ZONE"
 320                                 ;;
 321                         *)
 322                                 ZONE="+0000"
 323                 esac
 324                 MTDATE="$SECS $ZONE"
 325         fi
 326         EMPTYID="- <-> $MTDATE"
 327         EMPTYTREE="$(git hash-object -t tree -w --stdin < /dev/null)"
 328         printf '%s\n' "tree $EMPTYTREE" "author $EMPTYID" "committer $EMPTYID" '' |
 329         git hash-object -t commit -w --stdin
 330 )
 331
 332 # setup_hook NAME
 333 setup_hook()
 334 {
 335         tgname="${0##*/}"
 336         hook_call="\"\$(\"$tgname\" --hooks-path)\"/$1 \"\$@\""
 337         if [ -f "$git_hooks_dir/$1" ] && LC_ALL=C grep -Fq "$hook_call" "$git_hooks_dir/$1"; then
 338                 # Another job well done!
 339                 return
 340         fi
 341         # Prepare incantation
 342         hook_chain=
 343         if [ -s "$git_hooks_dir/$1" -a -x "$git_hooks_dir/$1" ]; then
 344                 hook_call="$hook_call"' || exit $?'
 345                 if [ -L "$git_hooks_dir/$1" ] || ! LC_ALL=C sed -n 1p <"$git_hooks_dir/$1" | LC_ALL=C grep -Fqx "#!@SHELL_PATH@"; then
 346                         chain_num=
 347                         while [ -e "$git_hooks_dir/$1-chain$chain_num" ]; do
 348                                 chain_num=$(( $chain_num + 1 ))
 349                         done
 350                         mv -f "$git_hooks_dir/$1" "$git_hooks_dir/$1-chain$chain_num"
 351                         hook_chain=1
 352                 fi
 353         else
 354                 hook_call="exec $hook_call"
 355                 [ -d "$git_hooks_dir" ] || mkdir -p "$git_hooks_dir" || :
 356         fi
 357         # Don't call hook if tg is not installed
 358         hook_call="if command -v \"$tgname\" >/dev/null 2>&1; then $hook_call; fi"
 359         # Insert call into the hook
 360         {
 361                 echol "#!@SHELL_PATH@"
 362                 echol "$hook_call"
 363                 if [ -n "$hook_chain" ]; then
 364                         echol "exec \"\$0-chain$chain_num\" \"\$@\""
 365                 else
 366                         [ ! -s "$git_hooks_dir/$1" ] || cat "$git_hooks_dir/$1"
 367                 fi
 368         } >"$git_hooks_dir/$1+"
 369         chmod a+x "$git_hooks_dir/$1+"
 370         mv "$git_hooks_dir/$1+" "$git_hooks_dir/$1"
 371 }
 372
 373 # setup_ours (no arguments)
 374 setup_ours()
 375 {
 376         if [ ! -s "$git_common_dir/info/attributes" ] || ! grep -q topmsg "$git_common_dir/info/attributes"; then
 377                 [ -d "$git_common_dir/info" ] || mkdir "$git_common_dir/info"
 378                 {
 379                         echo ".topmsg   merge=ours"
 380                         echo ".topdeps  merge=ours"
 381                 } >>"$git_common_dir/info/attributes"
 382         fi
 383         if ! git config merge.ours.driver >/dev/null; then
 384                 git config merge.ours.name '"always keep ours" merge driver'
 385                 git config merge.ours.driver 'touch %A'
 386         fi
 387 }
 388
 389 # measure_branch NAME [BASE] [EXTRAHEAD...]
 390 measure_branch()
 391 {
 392         _bname="$1"; _base="$2"
 393         shift; shift
 394         [ -n "$_base" ] || _base="refs/$topbases/$(strip_ref "$_bname")"
 395         # The caller should've verified $name is valid
 396         _commits="$(git rev-list --count "$_bname" "$@" ^"$_base" --)"
 397         _nmcommits="$(git rev-list --count --no-merges "$_bname" "$@" ^"$_base" --)"
 398         if [ $_commits -ne 1 ]; then
 399                 _suffix="commits"
 400         else
 401                 _suffix="commit"
 402         fi
 403         echo "$_commits/$_nmcommits $_suffix"
 404 }
 405
 406 # branch_contains B1 B2
 407 # Whether B1 is a superset of B2.
 408 branch_contains()
 409 {
 410         _revb1="$(ref_exists_rev "$1")" || return 0
 411         _revb2="$(ref_exists_rev "$2")" || return 0
 412         if [ -s "$tg_cache_dir/$1/.bc/$2/.d" ]; then
 413                 if read _result _rev_matchb1 _rev_matchb2 &&
 414                         [ "$_revb1" = "$_rev_matchb1" -a "$_revb2" = "$_rev_matchb2" ]; then
 415                         return $_result
 416                 fi <"$tg_cache_dir/$1/.bc/$2/.d"
 417         fi
 418         [ -d "$tg_cache_dir/$1/.bc/$2" ] || mkdir -p "$tg_cache_dir/$1/.bc/$2" 2>/dev/null || :
 419         _result=0
 420         [ "$(git rev-list --count --max-count=1 "$_revb2" --not "$_revb1" --)" = "0" ] || _result=1
 421         if [ -d "$tg_cache_dir/$1/.bc/$2" ]; then
 422                 echo "$_result" "$_revb1" "$_revb2" >"$tg_cache_dir/$1/.bc/$2/.d"
 423         fi
 424         return $_result
 425 }
 426
 427 create_ref_dirs()
 428 {
 429         [ ! -s "$tg_tmp_dir/tg~ref-dirs-created" -a -s "$tg_ref_cache" ] || return 0
 430         sed -e 's/ .*$//;'"s~^~$tg_tmp_dir/cached/~" <"$tg_ref_cache" | xargs mkdir -p
 431         echo 1 >"$tg_tmp_dir/tg~ref-dirs-created"
 432 }
 433
 434 # If the first argument is non-empty, stores "1" there if this call created the cache
 435 v_create_ref_cache()
 436 {
 437         [ -n "$tg_ref_cache" -a ! -s "$tg_ref_cache" ] || return 0
 438         _remotespec=
 439         [ -z "$base_remote" ] || _remotespec="refs/remotes/$base_remote"
 440         [ -z "$1" ] || eval "$1=1"
 441         git for-each-ref --format='%(refname) %(objectname)' \
 442                 refs/heads "refs/$topbases" $_remotespec >"$tg_ref_cache"
 443         create_ref_dirs
 444 }
 445
 446 remove_ref_cache()
 447 {
 448         [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ] || return 0
 449         >"$tg_ref_cache"
 450 }
 451
 452 # setting tg_ref_cache_only to non-empty will force non-$tg_ref_cache lookups to fail
 453 rev_parse()
 454 {
 455         if [ -n "$tg_ref_cache" -a -s "$tg_ref_cache" ]; then
 456                 LC_ALL=C awk -v r="$1" 'BEGIN {e=1}; $1 == r {print $2; e=0; exit}; END {exit e}' <"$tg_ref_cache"
 457         else
 458                 [ -z "$tg_ref_cache_only" ] || return 1
 459                 git rev-parse --quiet --verify "$1^0" -- 2>/dev/null
 460         fi
 461 }
 462
 463 # ref_exists_rev REF
 464 # Whether REF is a valid ref name
 465 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 466 # or, if $base_remote is set, refs/remotes/$base_remote/
 467 # Caches result if $tg_read_only and outputs HASH on success
 468 ref_exists_rev()
 469 {
 470         case "$1" in
 471                 refs/*)
 472                         ;;
 473                 $octet20)
 474                         printf '%s' "$1"
 475                         return;;
 476                 *)
 477                         die "ref_exists_rev requires fully-qualified ref name"
 478         esac
 479         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify "$1^0" -- 2>/dev/null; return; }
 480         _result=
 481         _result_rev=
 482         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.ref"; } 2>/dev/null || :
 483         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 484         _result_rev="$(rev_parse "$1")"
 485         _result=$?
 486         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 487         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 488         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.ref" 2>/dev/null || :
 489         printf '%s' "$_result_rev"
 490         return $_result
 491 }
 492
 493 # Same as ref_exists_rev but output is abbreviated hash
 494 # Optional second argument defaults to --short but may be any --short=.../--no-short option
 495 ref_exists_rev_short()
 496 {
 497         case "$1" in
 498                 refs/*)
 499                         ;;
 500                 $octet20)
 501                         ;;
 502                 *)
 503                         die "ref_exists_rev_short requires fully-qualified ref name"
 504         esac
 505         [ -n "$tg_read_only" ] || { git rev-parse --quiet --verify ${2:---short} "$1^0" -- 2>/dev/null; return; }
 506         _result=
 507         _result_rev=
 508         { read -r _result _result_rev <"$tg_tmp_dir/cached/$1/.rfs"; } 2>/dev/null || :
 509         [ -z "$_result" ] || { printf '%s' "$_result_rev"; return $_result; }
 510         _result_rev="$(rev_parse "$1")"
 511         _result=$?
 512         if [ $_result -eq 0 ]; then
 513                 _result_rev="$(git rev-parse --verify ${2:---short} --quiet "$_result_rev" --)"
 514                 _result=$?
 515         fi
 516         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null
 517         [ ! -d "$tg_tmp_dir/cached/$1" ] ||
 518         echo $_result $_result_rev >"$tg_tmp_dir/cached/$1/.rfs" 2>/dev/null || :
 519         printf '%s' "$_result_rev"
 520         return $_result
 521 }
 522
 523 # ref_exists REF
 524 # Whether REF is a valid ref name
 525 # REF must be fully qualified and start with refs/heads/, refs/$topbases/
 526 # or, if $base_remote is set, refs/remotes/$base_remote/
 527 # Caches result
 528 ref_exists()
 529 {
 530         ref_exists_rev "$1" >/dev/null
 531 }
 532
 533 # rev_parse_tree REF
 534 # Runs git rev-parse REF^{tree}
 535 # Caches result if $tg_read_only
 536 rev_parse_tree()
 537 {
 538         [ -n "$tg_read_only" ] || { git rev-parse --verify "$1^{tree}" -- 2>/dev/null; return; }
 539         if [ -f "$tg_tmp_dir/cached/$1/.rpt" ]; then
 540                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 541                         printf '%s\n' "$_result"
 542                         return 0
 543                 fi
 544                 return 1
 545         fi
 546         [ -d "$tg_tmp_dir/cached/$1" ] || mkdir -p "$tg_tmp_dir/cached/$1" 2>/dev/null || :
 547         if [ -d "$tg_tmp_dir/cached/$1" ]; then
 548                 git rev-parse --verify "$1^{tree}" -- >"$tg_tmp_dir/cached/$1/.rpt" 2>/dev/null || :
 549                 if IFS= read -r _result <"$tg_tmp_dir/cached/$1/.rpt"; then
 550                         printf '%s\n' "$_result"
 551                         return 0
 552                 fi
 553                 return 1
 554         fi
 555         git rev-parse --verify "$1^{tree}" -- 2>/dev/null
 556 }
 557
 558 # has_remote BRANCH
 559 # Whether BRANCH has a remote equivalent (accepts ${topbases#heads/}/ too)
 560 has_remote()
 561 {
 562         [ -n "$base_remote" ] && ref_exists "refs/remotes/$base_remote/$1"
 563 }
 564
 565 # Return the verified TopGit branch name or die with an error.
 566 # As a convenience, if HEAD or @ is given and HEAD is a symbolic ref to
 567 # refs/heads/... then ... will be verified instead.
 568 # if "$2" = "-f" (for fail) then return an error rather than dying.
 569 verify_topgit_branch()
 570 {
 571         case "$1" in
 572                 refs/"$topbases"/*)
 573                         _verifyname="${1#refs/$topbases/}"
 574                         ;;
 575                 refs/heads/*)
 576                         _verifyname="${1#refs/heads/}"
 577                         ;;
 578                 HEAD|@)
 579                         _verifyname="$(git symbolic-ref HEAD 2>/dev/null)" || :
 580                         [ -n "$_verifyname" -o "$2" = "-f" ] || die "HEAD is not a symbolic ref"
 581                         case "$_verifyname" in refs/heads/*);;*)
 582                                 [ "$2" != "-f" ] || return 1
 583                                 die "HEAD is not a symbolic ref to the refs/heads namespace"
 584                         esac
 585                         _verifyname="${_verifyname#refs/heads/}"
 586                         ;;
 587                 *)
 588                         _verifyname="$1"
 589                         ;;
 590         esac
 591         if ! ref_exists "refs/heads/$_verifyname"; then
 592                 [ "$2" != "-f" ] || return 1
 593                 die "no such branch: $_verifyname"
 594         fi
 595         if ! ref_exists "refs/$topbases/$_verifyname"; then
 596                 [ "$2" != "-f" ] || return 1
 597                 die "not a TopGit-controlled branch: $_verifyname"
 598         fi
 599         printf '%s' "$_verifyname"
 600 }
 601
 602 # Caches result
 603 # $1 = branch name (i.e. "t/foo/bar")
 604 # $2 = optional result of rev-parse "refs/heads/$1"
 605 # $3 = optional result of rev-parse "refs/$topbases/$1"
 606 branch_annihilated()
 607 {
 608         _branch_name="$1"
 609         _rev="${2:-$(ref_exists_rev "refs/heads/$_branch_name")}"
 610         _rev_base="${3:-$(ref_exists_rev "refs/$topbases/$_branch_name")}"
 611
 612         _result=
 613         _result_rev=
 614         _result_rev_base=
 615         { read -r _result _result_rev _result_rev_base <"$tg_cache_dir/$_branch_name/.ann"; } 2>/dev/null || :
 616         [ -z "$_result" -o "$_result_rev" != "$_rev" -o "$_result_rev_base" != "$_rev_base" ] || return $_result
 617
 618         # use the merge base in case the base is ahead.
 619         mb="$(git merge-base "$_rev_base" "$_rev" 2>/dev/null)"
 620
 621         test -z "$mb" || test "$(rev_parse_tree "$mb")" = "$(rev_parse_tree "$_rev")"
 622         _result=$?
 623         [ -d "$tg_cache_dir/$_branch_name" ] || mkdir -p "$tg_cache_dir/$_branch_name" 2>/dev/null
 624         [ ! -d "$tg_cache_dir/$_branch_name" ] ||
 625         echo $_result $_rev $_rev_base >"$tg_cache_dir/$_branch_name/.ann" 2>/dev/null || :
 626         return $_result
 627 }
 628
 629 non_annihilated_branches()
 630 {
 631         [ $# -gt 0 ] || set -- "refs/$topbases"
 632         git for-each-ref --format='%(objectname) %(refname)' "$@" |
 633                 while read rev ref; do
 634                         name="${ref#refs/$topbases/}"
 635                         if branch_annihilated "$name" "" "$rev"; then
 636                                 continue
 637                         fi
 638                         echol "$name"
 639                 done
 640 }
 641
 642 # Make sure our tree is clean
 643 # if optional "$1" given also verify that a checkout to "$1" would succeed
 644 ensure_clean_tree()
 645 {
 646         check_status
 647         [ -z "$tg_state$git_state" ] || { do_status; exit 1; }
 648         git update-index --ignore-submodules --refresh ||
 649                 die "the working directory has uncommitted changes (see above) - first commit or reset them"
 650         [ -z "$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)" ] ||
 651                 die "the index has uncommited changes"
 652         [ -z "$1" ] || git read-tree -n -u -m "$1" ||
 653                 die "git checkout \"$1\" would fail"
 654 }
 655
 656 # is_sha1 REF
 657 # Whether REF is a SHA1 (compared to a symbolic name).
 658 is_sha1()
 659 {
 660         case "$1" in $octet20) return 0;; esac
 661         return 1
 662 }
 663
 664 # recurse_deps_internal NAME [BRANCHPATH...]
 665 # get recursive list of dependencies with leading 0 if branch exists 1 if missing
 666 # followed by a 1 if the branch is "tgish" or a 0 if not
 667 # followed by a 0 for a non-leaf, 1 for a leaf or 2 for annihilated tgish
 668 # but missing and remotes are always "0"
 669 # then the branch name followed by its depedency chain (which might be empty)
 670 # An output line might look like this:
 671 #   0 1 1 t/foo/leaf t/foo/int t/stage
 672 # If no_remotes is non-empty, exclude remotes
 673 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
 674 # but the leaf info will always be 0 or 2 in that case
 675 # If with_top_level is non-empty, include the top-level that's normally omitted
 676 # any branch names in the space-separated recurse_deps_exclude variable
 677 # are skipped (along with their dependencies)
 678 recurse_deps_internal()
 679 {
 680         case " $recurse_deps_exclude " in *" $1 "*) return 0; esac
 681         _ref_hash=
 682         if ! _ref_hash="$(ref_exists_rev "refs/heads/$1")"; then
 683                 [ -z "$2" ] || echo "1 0 0 $*"
 684                 return 0
 685         fi
 686
 687         _is_tgish=0
 688         _ref_hash_base=
 689         _is_leaf=0
 690         ! _ref_hash_base="$(ref_exists_rev "refs/$topbases/$1")" || _is_tgish=1
 691         [ "$_is_tgish" = "0" ] || ! branch_annihilated "$1" "$_ref_hash" "$_ref_hash_base" || _is_leaf=2
 692         [ -z "$recurse_preorder" -o -z "${2:-$with_top_level}" ] || echo "0 $_is_tgish $_is_leaf $*"
 693
 694         # If no_remotes is unset also check our base against remote base.
 695         # Checking our head against remote head has to be done in the helper.
 696         if [ "$_is_tgish" = "1" ] && [ -z "$no_remotes" ] && has_remote "${topbases#heads/}/$1"; then
 697                 echo "0 0 0 refs/remotes/$base_remote/${topbases#heads/}/$1 $*"
 698         fi
 699
 700         # if the branch was annihilated, it is considered to have no dependencies
 701         [ "$_is_leaf" = "2" ] || _is_leaf=1
 702         if [ "$_is_tgish" = "1" ] && [ "$_is_leaf" = "1" ]; then
 703                 #TODO: handle nonexisting .topdeps?
 704                 while read _dname && [ -n "$_dname" ]; do
 705                         # Avoid depedency loops
 706                         case " $* " in *" $_dname "*)
 707                                 warn "dependency loop detected in branch $_dname"
 708                                 _is_leaf=0
 709                                 continue
 710                         esac
 711                         # Shoo shoo, leave our environment alone!
 712                         _dep_is_leaf=0
 713                         (recurse_deps_internal "$_dname" "$@") || _dep_is_leaf=$?
 714                         [ "$_dep_is_leaf" = "2" ] || _is_leaf=0
 715                 done <<-EOT
 716                         $(cat_deps "$1")
 717                 EOT
 718         fi
 719
 720         [ -n "$recurse_preorder" -o -z "${2:-$with_top_level}" ] || echo "0 $_is_tgish $_is_leaf $*"
 721         return ${_is_leaf:-0}
 722 }
 723
 724 # do_eval CMD
 725 # helper for recurse_deps so that a return statement executed inside CMD
 726 # does not return from recurse_deps.  This shouldn't be necessary, but it
 727 # seems that it actually is.
 728 do_eval()
 729 {
 730         eval "$@"
 731 }
 732
 733 # becomes read-only for caching purposes
 734 # assigns new value to tg_read_only
 735 # become_cacheable/undo_become_cacheable calls may be nested
 736 become_cacheable()
 737 {
 738         _old_tg_read_only="$tg_read_only"
 739         if [ -z "$tg_read_only" ]; then
 740                 ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 741                 rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 742                 tg_read_only=1
 743         fi
 744         _my_ref_cache=
 745         v_create_ref_cache _my_ref_cache
 746         _my_ref_cache="${_my_ref_cache:+1}"
 747         tg_read_only="undo${_my_ref_cache:-0}-$_old_tg_read_only"
 748 }
 749
 750 # restores tg_read_only and ref_cache to state before become_cacheable call
 751 # become_cacheable/undo_bocome_cacheable calls may be nested
 752 undo_become_cacheable()
 753 {
 754         case "$tg_read_only" in
 755                 "undo"[01]"-"*)
 756                         _suffix="${tg_read_only#undo?-}"
 757                         [ "${tg_read_only%$_suffix}" = "undo0-" ] || remove_ref_cache
 758                         tg_read_only="$_suffix"
 759         esac
 760 }
 761
 762 # just call this, no undo, sets tg_read_only= and removes ref cache and cached results
 763 become_non_cacheable()
 764 {
 765         remove_ref_cache
 766         tg_read_only=
 767         ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 768         rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 769 }
 770
 771 # call this to make sure Git will not complain about a missing user/email
 772 # result is cached in TG_IDENT_CHECKED and a non-empty value suppresses the check
 773 ensure_ident_available()
 774 {
 775         [ -z "$TG_IDENT_CHECKED" ] || return 0
 776         git var GIT_AUTHOR_IDENT >/dev/null &&
 777         git var GIT_COMMITTER_IDENT >/dev/null || exit
 778         TG_IDENT_CHECKED=1
 779         export TG_IDENT_CHECKED
 780         return 0
 781 }
 782
 783 # recurse_deps CMD NAME [BRANCHPATH...]
 784 # Recursively eval CMD on all dependencies of NAME.
 785 # Dependencies are visited in topological order.
 786 # CMD can refer to $_name for queried branch name,
 787 # $_dep for dependency name,
 788 # $_depchain for space-seperated branch backtrace,
 789 # $_dep_missing boolean to check whether $_dep is present
 790 # and the $_dep_is_tgish and $_dep_annihilated booleans.
 791 # If recurse_preorder is NOT set then the $_dep_is_leaf boolean is also valid.
 792 # It can modify $_ret to affect the return value
 793 # of the whole function.
 794 # If recurse_deps() hits missing dependencies, it will append
 795 # them to space-separated $missing_deps list and skip them
 796 # after calling CMD with _dep_missing set.
 797 # remote dependencies are processed if no_remotes is unset.
 798 # any branch names in the space-separated recurse_deps_exclude variable
 799 # are skipped (along with their dependencies)
 800 recurse_deps()
 801 {
 802         _cmd="$1"; shift
 803
 804         become_cacheable
 805         _depsfile="$(get_temp tg-depsfile)"
 806         recurse_deps_internal "$@" >>"$_depsfile" || :
 807         undo_become_cacheable
 808
 809         _ret=0
 810         while read _ismissing _istgish _isleaf _dep _name _deppath; do
 811                 _depchain="$_name${_deppath:+ $_deppath}"
 812                 _dep_is_tgish=
 813                 [ "$_istgish" = "0" ] || _dep_is_tgish=1
 814                 _dep_missing=
 815                 if [ "$_ismissing" != "0" ]; then
 816                         _dep_missing=1
 817                         case " $missing_deps " in *" $_dep "*);;*)
 818                                 missing_deps="${missing_deps:+$missing_deps }$_dep"
 819                         esac
 820                 fi
 821                 _dep_annihilated=
 822                 _dep_is_leaf=
 823                 if [ "$_isleaf" = "1" ]; then
 824                         _dep_is_leaf=1
 825                 elif [ "$_isleaf" = "2" ]; then
 826                         _dep_annihilated=1
 827                 fi
 828                 do_eval "$_cmd"
 829         done <"$_depsfile"
 830         rm -f "$_depsfile"
 831         return $_ret
 832 }
 833
 834 find_leaves_internal()
 835 {
 836         if [ -n "$_dep_is_leaf" ] && [ -z "$_dep_annihilated" ] && [ -z "$_dep_missing" ]; then
 837                 if [ -n "$_dep_is_tgish" ]; then
 838                         fulldep="refs/$topbases/$_dep"
 839                 else
 840                         fulldep="refs/heads/$_dep"
 841                 fi
 842                 case " $seen_leaf_refs " in *" $fulldep "*);;*)
 843                         seen_leaf_refs="${seen_leaf_refs:+$seen_leaf_refs }$fulldep"
 844                         if fullrev="$(ref_exists_rev "$fulldep")"; then
 845                                 case " $seen_leaf_revs " in *" $fullrev "*);;*)
 846                                         seen_leaf_revs="${seen_leaf_revs:+$seen_leaf_revs }$fullrev"
 847                                         # See if Git knows it by another name
 848                                         if tagname="$(git describe --exact-match "$fullrev" 2>/dev/null)" && [ -n "$tagname" ]; then
 849                                                 echo "refs/tags/$tagname"
 850                                         else
 851                                                 echo "$fulldep"
 852                                         fi
 853                                 esac
 854                         fi
 855                 esac
 856         fi
 857 }
 858
 859 # find_leaves NAME
 860 # output (one per line) the unique leaves of NAME
 861 # a leaf is either
 862 #   1) a non-tgish dependency
 863 #   2) the base of a tgish dependency with no non-annihilated dependencies
 864 # duplicates are suppressed (by commit rev) and remotes are always ignored
 865 # if a leaf has an exact tag match that will be output
 866 # note that recurse_deps_exclude IS honored for this operation
 867 find_leaves()
 868 {
 869         no_remotes=1
 870         with_top_level=1
 871         recurse_preorder=
 872         seen_leaf_refs=
 873         seen_leaf_revs=
 874         recurse_deps find_leaves_internal "$1"
 875         with_top_level=
 876 }
 877
 878 # branch_needs_update
 879 # This is a helper function for determining whether given branch
 880 # is up-to-date wrt. its dependencies. It expects input as if it
 881 # is called as a recurse_deps() helper.
 882 # In case the branch does need update, it will echo it together
 883 # with the branch backtrace on the output (see needs_update()
 884 # description for details) and set $_ret to non-zero.
 885 branch_needs_update()
 886 {
 887         if [ -n "$_dep_missing" ]; then
 888                 echo "! $_dep $_depchain"
 889                 return 0
 890         fi
 891
 892         if [ -n "$_dep_is_tgish" ]; then
 893                 branch_annihilated "$_dep" && return 0
 894
 895                 if has_remote "$_dep"; then
 896                         branch_contains "refs/heads/$_dep" "refs/remotes/$base_remote/$_dep" ||
 897                                 echo "refs/remotes/$base_remote/$_dep $_dep $_depchain"
 898                 fi
 899                 # We want to sync with our base first and should output this before
 900                 # the remote branch, but the order does not actually matter to tg-update
 901                 # as it just recurses regardless, but it does matter for tg-info (which
 902                 # treats out-of-date bases as though they were already merged in) so
 903                 # we output the remote before the base.
 904                 branch_contains "refs/heads/$_dep" "refs/$topbases/$_dep" || {
 905                         echo ": $_dep $_depchain"
 906                         _ret=1
 907                         return
 908                 }
 909         fi
 910
 911         if [ -n "$_name" ]; then
 912                 case "$_dep" in refs/*) _fulldep="$_dep";; *) _fulldep="refs/heads/$_dep";; esac
 913                 if ! branch_contains "refs/$topbases/$_name" "$_fulldep"; then
 914                         # Some new commits in _dep
 915                         echo "$_dep $_depchain"
 916                         _ret=1
 917                 fi
 918         fi
 919 }
 920
 921 # needs_update NAME
 922 # This function is recursive; it outputs reverse path from NAME
 923 # to the branch (e.g. B_DIRTY B1 B2 NAME), one path per line,
 924 # inner paths first. Innermost name can be refs/remotes/<remote>/<name>
 925 # if the head is not in sync with the <remote> branch <name>, ':' if
 926 # the head is not in sync with the base (in this order of priority)
 927 # or '!' if dependency is missing.  Note that the remote branch, base
 928 # order is reversed from the order they will actually be updated in
 929 # order to accomodate tg info which treats out-of-date items that are
 930 # only in the base as already being in the head for status purposes.
 931 # It will also return non-zero status if NAME needs update.
 932 # If needs_update() hits missing dependencies, it will append
 933 # them to space-separated $missing_deps list and skip them.
 934 needs_update()
 935 {
 936         recurse_deps branch_needs_update "$1"
 937 }
 938
 939 # branch_empty NAME [-i | -w]
 940 branch_empty()
 941 {
 942         if [ -z "$2" ]; then
 943                 _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
 944                 _result=
 945                 _result_rev=
 946                 { read -r _result _result_rev <"$tg_cache_dir/$1/.mt"; } 2>/dev/null || :
 947                 [ -z "$_result" -o "$_result_rev" != "$_rev" ] || return $_result
 948                 _result=0
 949                 [ "$(pretty_tree "$1" -b)" = "$(pretty_tree "$1" $2)" ] || _result=$?
 950                 [ -d "$tg_cache_dir/$1" ] || mkdir -p "$tg_cache_dir/$1" 2>/dev/null
 951                 [ ! -d "$tg_cache_dir/$1" ] || echo $_result $_rev >"$tg_cache_dir/$1/.mt"
 952                 return $_result
 953         else
 954                 [ "$(pretty_tree "$1" -b)" = "$(pretty_tree "$1" $2)" ]
 955         fi
 956 }
 957
 958 # list_deps [-i | -w] [BRANCH]
 959 # -i/-w apply only to HEAD
 960 list_deps()
 961 {
 962         head_from=
 963         [ "$1" != "-i" -a "$1" != "-w" ] || { head_from="$1"; shift; }
 964         head="$(git symbolic-ref -q HEAD)" ||
 965                 head="..detached.."
 966
 967         git for-each-ref --format='%(objectname) %(refname)' "refs/$topbases${1:+/$1}" |
 968                 while read rev ref; do
 969                         name="${ref#refs/$topbases/}"
 970                         if branch_annihilated "$name" "" "$rev"; then
 971                                 continue
 972                         fi
 973
 974                         from=$head_from
 975                         [ "refs/heads/$name" = "$head" ] ||
 976                                 from=
 977                         cat_file "refs/heads/$name:.topdeps" $from | while read dep; do
 978                                 dep_is_tgish=true
 979                                 ref_exists "refs/$topbases/$dep" ||
 980                                         dep_is_tgish=false
 981                                 if ! "$dep_is_tgish" || ! branch_annihilated $dep; then
 982                                         echo "$name $dep"
 983                                 fi
 984                         done
 985                 done
 986 }
 987
 988 # switch_to_base NAME [SEED]
 989 switch_to_base()
 990 {
 991         _base="refs/$topbases/$1"; _seed="$2"
 992         # We have to do all the hard work ourselves :/
 993         # This is like git checkout -b "$_base" "$_seed"
 994         # (or just git checkout "$_base"),
 995         # but does not create a detached HEAD.
 996         git read-tree -u -m HEAD "${_seed:-$_base}"
 997         [ -z "$_seed" ] || git update-ref "$_base" "$_seed"
 998         git symbolic-ref HEAD "$_base"
 999 }
1000
1001 # run editor with arguments
1002 # the editor setting will be cached in $tg_editor (which is eval'd)
1003 # result non-zero if editor fails or GIT_EDITOR cannot be determined
1004 run_editor()
1005 {
1006         tg_editor="$GIT_EDITOR"
1007         [ -n "$tg_editor" ] || tg_editor="$(git var GIT_EDITOR)" || return $?
1008         eval "$tg_editor" '"$@"'
1009 }
1010
1011 # Show the help messages.
1012 do_help()
1013 {
1014         _www=
1015         if [ "$1" = "-w" ]; then
1016                 _www=1
1017                 shift
1018         fi
1019         if [ -z "$1" ] ; then
1020                 # This is currently invoked in all kinds of circumstances,
1021                 # including when the user made a usage error. Should we end up
1022                 # providing more than a short help message, then we should
1023                 # differentiate.
1024                 # Petr's comment: http://marc.info/?l=git&m=122718711327376&w=2
1025
1026                 ## Build available commands list for help output
1027
1028                 cmds=
1029                 sep=
1030                 for cmd in "$TG_INST_CMDDIR"/tg-[!-]*; do
1031                         ! [ -r "$cmd" ] && continue
1032                         # strip directory part and "tg-" prefix
1033                         cmd="${cmd##*/}"
1034                         cmd="${cmd#tg-}"
1035                         [ "$cmd" != "migrate-bases" ] || continue
1036                         [ "$cmd" != "summary" ] || cmd="status|$cmd"
1037                         cmds="$cmds$sep$cmd"
1038                         sep="|"
1039                 done
1040
1041                 echo "TopGit version $TG_VERSION - A different patch queue manager"
1042                 echo "Usage: $tgname [-C <dir>] [-r <remote> | -u] [-c <name>=<val>] ($cmds) ..."
1043                 echo "   Or: $tgname help [-w] [<command>]"
1044                 echo "Use \"$tgdisplaydir$tgname help tg\" for overview of TopGit"
1045         elif [ -r "$TG_INST_CMDDIR"/tg-$1 -o -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1046                 if [ -n "$_www" ]; then
1047                         nohtml=
1048                         if ! [ -r "$TG_INST_SHAREDIR/topgit.html" ]; then
1049                                 echo "${0##*/}: missing html help file:" \
1050                                         "$TG_INST_SHAREDIR/topgit.html" 1>&2
1051                                 nohtml=1
1052                         fi
1053                         if ! [ -r "$TG_INST_SHAREDIR/tg-$1.html" ]; then
1054                                 echo "${0##*/}: missing html help file:" \
1055                                         "$TG_INST_SHAREDIR/tg-$1.html" 1>&2
1056                                 nohtml=1
1057                         fi
1058                         if [ -n "$nohtml" ]; then
1059                                 echo "${0##*/}: use" \
1060                                         "\"${0##*/} help $1\" instead" 1>&2
1061                                 exit 1
1062                         fi
1063                         git web--browse -c help.browser "$TG_INST_SHAREDIR/tg-$1.html"
1064                         exit
1065                 fi
1066                 output()
1067                 {
1068                         if [ -r "$TG_INST_CMDDIR"/tg-$1 ] ; then
1069                                 "$TG_INST_CMDDIR"/tg-$1 -h 2>&1 || :
1070                                 echo
1071                         elif [ "$1" = "help" ]; then
1072                                 echo "Usage: ${tgname:-tg} help [-w] [<command>]"
1073                                 echo
1074                         elif [ "$1" = "status" ]; then
1075                                 echo "Usage: ${tgname:-tg} status [-v] [--exit-code]"
1076                                 echo
1077                         fi
1078                         if [ -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1079                                 cat "$TG_INST_SHAREDIR/tg-$1.txt"
1080                         fi
1081                 }
1082                 page output "$1"
1083         else
1084                 echo "${0##*/}: no help for $1" 1>&2
1085                 do_help
1086                 exit 1
1087         fi
1088 }
1089
1090 check_status()
1091 {
1092         git_state=
1093         git_remove=
1094         if [ -e "$git_dir/MERGE_HEAD" ]; then
1095                 git_state="merge"
1096         elif [ -e "$git_dir/rebase-apply/applying" ]; then
1097                 git_state="am"
1098                 git_remove="$git_dir/rebase-apply"
1099         elif [ -e "$git_dir/rebase-apply" ]; then
1100                 git_state="rebase"
1101                 git_remove="$git_dir/rebase-apply"
1102         elif [ -e "$git_dir/rebase-merge" ]; then
1103                 git_state="rebase"
1104                 git_remove="$git_dir/rebase-merge"
1105         elif [ -e "$git_dir/CHERRY_PICK_HEAD" ]; then
1106                 git_state="cherry-pick"
1107         elif [ -e "$git_dir/BISECT_LOG" ]; then
1108                 git_state="bisect"
1109         elif [ -e "$git_dir/REVERT_HEAD" ]; then
1110                 git_state="revert"
1111         fi
1112         git_remove="${git_remove#./}"
1113
1114         tg_state=
1115         tg_remove=
1116         if [ -e "$git_dir/tg-update" ]; then
1117                 tg_state="update"
1118                 tg_remove="$git_dir/tg-update"
1119         fi
1120         tg_remove="${tg_remove#./}"
1121 }
1122
1123 # Show status information
1124 do_status()
1125 {
1126         do_status_result=0
1127         do_status_verbose=
1128         while [ $# -gt 0 ] && case "$1" in
1129                 --verbose|-v)
1130                         do_status_verbose=1
1131                         ;;
1132                 --exit-code)
1133                         do_status_result=2
1134                         ;;
1135                 *)
1136                         die "unknown status argument: $1"
1137                         ;;
1138         esac; do shift; done
1139         check_status
1140         symref="$(git symbolic-ref --quiet HEAD)" || :
1141         headrv="$(git rev-parse --quiet --verify --short HEAD --)" || :
1142         if [ -n "$symref" ]; then
1143                 echol "HEAD -> $symref (${headrv:-unborn})"
1144         else
1145                 echol "HEAD -> ${headrv:-?}"
1146         fi
1147         if [ -n "$tg_state" ]; then
1148                 extra=
1149                 if [ "$tg_state" = "update" ]; then
1150                         IFS= read -r uname <"$git_dir/tg-update/name" || :
1151                         [ -z "$uname" ] ||
1152                         extra="; currently updating branch '$uname'"
1153                 fi
1154                 echol "tg $tg_state in progress$extra"
1155                 if [ -s "$git_dir/tg-update/fullcmd" ] && [ -s "$git_dir/tg-update/names" ]; then
1156                         printf 'You are currently updating as a result of:\n  '
1157                         cat "$git_dir/tg-update/fullcmd"
1158                         bcnt="$(( $(wc -w < "$git_dir/tg-update/names") ))"
1159                         if [ $bcnt -gt 1 ]; then
1160                                 pcnt=0
1161                                 ! [ -s "$git_dir/tg-update/processed" ] ||
1162                                 pcnt="$(( $(wc -w < "$git_dir/tg-update/processed") ))"
1163                                 echo "$pcnt of $bcnt branches updated so far"
1164                         fi
1165                 fi
1166                 if [ "$tg_state" = "update" ]; then
1167                         echol '  (use "tg update --continue" to continue)'
1168                         echol '  (use "tg update --skip" to skip this branch and continue)'
1169                         echol '  (use "tg update --stop" to stop and retain updates so far)'
1170                         echol '  (use "tg update --abort" to restore pre-update state)'
1171                 fi
1172         fi
1173         [ -z "$git_state" ] || echo "git $git_state in progress"
1174         if [ "$git_state" = "merge" ]; then
1175                 ucnt="$(( $(git ls-files --unmerged --full-name --abbrev :/ | wc -l) ))"
1176                 if [ $ucnt -gt 0 ]; then
1177                         echo 'fix conflicts and then "git commit" the result'
1178                 else
1179                         echo 'all conflicts fixed; run "git commit" to record result'
1180                 fi
1181         fi
1182         if [ -z "$git_state" ]; then
1183                 ccnt="$(( $(git status --porcelain -uno | wc -l) ))"
1184                 untr=
1185                 if [ "$ccnt" -eq 0 ]; then
1186                         if git status --porcelain | grep -q '^[?]'; then
1187                                 untr="; non-ignored, untracked files present"
1188                         fi
1189                         echo "working directory is clean$untr"
1190                         [ -n "$tg_state" ] || do_status_result=0
1191                 else
1192                         echo "working directory is DIRTY"
1193                 fi
1194         fi
1195 }
1196
1197 ## Pager stuff
1198
1199 # isatty FD
1200 isatty()
1201 {
1202         test -t $1
1203 }
1204
1205 # pass "diff" to get pager.diff
1206 # if pager.$1 is a boolean false returns cat
1207 # if set to true or unset fails
1208 # otherwise succeeds and returns the value
1209 get_pager()
1210 {
1211         if _x="$(git config --bool "pager.$1" 2>/dev/null)"; then
1212                 [ "$_x" != "true" ] || return 1
1213                 echo "cat"
1214                 return 0
1215         fi
1216         if _x="$(git config "pager.$1" 2>/dev/null)"; then
1217                 echol "$_x"
1218                 return 0
1219         fi
1220         return 1
1221 }
1222
1223 # setup_pager
1224 # Set TG_PAGER to a valid executable
1225 # After calling, code to be paged should be surrounded with {...} | eval "$TG_PAGER"
1226 # See also the following "page" function for ease of use
1227 # emptypager will be set to 1 (otherwise empty) if TG_PAGER was set to "cat" to not be empty
1228 # Preference is (same as Git):
1229 #   1. GIT_PAGER
1230 #   2. pager.$USE_PAGER_TYPE (but only if USE_PAGER_TYPE is set and so is pager.$USE_PAGER_TYPE)
1231 #   3. core.pager (only if set)
1232 #   4. PAGER
1233 #   5. git var GIT_PAGER
1234 #   6. less
1235 setup_pager()
1236 {
1237         isatty 1 || { emptypager=1; TG_PAGER=cat; return 0; }
1238
1239         emptypager=
1240         if [ -z "$TG_PAGER_IN_USE" ]; then
1241                 # TG_PAGER = GIT_PAGER | PAGER | less
1242                 # NOTE: GIT_PAGER='' is significant
1243                 if [ -n "${GIT_PAGER+set}" ]; then
1244                         TG_PAGER="$GIT_PAGER"
1245                 elif [ -n "$USE_PAGER_TYPE" ] && _dp="$(get_pager "$USE_PAGER_TYPE")"; then
1246                         TG_PAGER="$_dp"
1247                 elif _cp="$(git config core.pager 2>/dev/null)"; then
1248                         TG_PAGER="$_cp"
1249                 elif [ -n "${PAGER+set}" ]; then
1250                         TG_PAGER="$PAGER"
1251                 else
1252                         _gp="$(git var GIT_PAGER 2>/dev/null)" || :
1253                         [ "$_gp" != ":" ] || _gp=
1254                         TG_PAGER="${_gp:-less}"
1255                 fi
1256                 if [ -z "$TG_PAGER" ]; then
1257                         emptypager=1
1258                         TG_PAGER=cat
1259                 fi
1260         else
1261                 emptypager=1
1262                 TG_PAGER=cat
1263         fi
1264
1265         # Set pager default environment variables
1266         # see pager.c:setup_pager
1267         if [ -z "${LESS+set}" ]; then
1268                 LESS="-FRX"
1269                 export LESS
1270         fi
1271         if [ -z "${LV+set}" ]; then
1272                 LV="-c"
1273                 export LV
1274         fi
1275
1276         # this is needed so e.g. $(git diff) will still colorize it's output if
1277         # requested in ~/.gitconfig with color.diff=auto
1278         GIT_PAGER_IN_USE=1
1279         export GIT_PAGER_IN_USE
1280
1281         # this is needed so we don't get nested pagers
1282         TG_PAGER_IN_USE=1
1283         export TG_PAGER_IN_USE
1284 }
1285
1286 # page eval_arg [arg ...]
1287 #
1288 # Calls setup_pager then evals the first argument passing it all the rest
1289 # where the output is piped through eval "$TG_PAGER" unless emptypager is set
1290 # by setup_pager (in which case the output is left as-is).
1291 #
1292 # To handle arbitrary paging duties, collect lines to be paged into a
1293 # function and then call page with the function name or perhaps func_name "$@".
1294 #
1295 # If no arguments at all are passed in do nothing (return with success).
1296 page()
1297 {
1298         [ $# -gt 0 ] || return 0
1299         setup_pager
1300         _evalarg="$1"; shift
1301         if [ -n "$emptypager" ]; then
1302                 eval "$_evalarg" '"$@"'
1303         else
1304                 eval "$_evalarg" '"$@"' | eval "$TG_PAGER"
1305         fi
1306 }
1307
1308 # get_temp NAME [-d]
1309 # creates a new temporary file (or directory with -d) in the global
1310 # temporary directory $tg_tmp_dir with pattern prefix NAME
1311 get_temp()
1312 {
1313         mktemp $2 "$tg_tmp_dir/$1.XXXXXX"
1314 }
1315
1316 # automatically called by strftime
1317 # does nothing if already setup
1318 # may be called explicitly if the first call would otherwise be in a subshell
1319 # so that the setup is only done once before subshells start being spawned
1320 setup_strftime()
1321 {
1322         [ -z "$strftime_is_setup" ] || return 0
1323
1324         # date option to format raw epoch seconds values
1325         daterawopt=
1326         _testes='951807788'
1327         _testdt='2000-02-29 07:03:08 UTC'
1328         _testfm='%Y-%m-%d %H:%M:%S %Z'
1329         if [ "$(TZ=UTC date "-d@$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1330                 daterawopt='-d@'
1331         elif [ "$(TZ=UTC date "-r$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1332                 daterawopt='-r'
1333         fi
1334         strftime_is_setup=1
1335 }
1336
1337 # $1 => strftime format string to use
1338 # $2 => raw timestamp as seconds since epoch
1339 # $3 => optional time zone string (empty/absent for local time zone)
1340 strftime()
1341 {
1342         setup_strftime
1343         if [ -n "$daterawopt" ]; then
1344                 if [ -n "$3" ]; then
1345                         TZ="$3" date "$daterawopt$2" "+$1"
1346                 else
1347                         date "$daterawopt$2" "+$1"
1348                 fi
1349         else
1350                 if [ -n "$3" ]; then
1351                         TZ="$3" perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1352                 else
1353                         perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1354                 fi
1355         fi
1356 }
1357
1358 setup_git_dirs()
1359 {
1360         [ -n "$git_dir" ] || git_dir="$(git rev-parse --git-dir)"
1361         if [ -n "$git_dir" ] && [ -d "$git_dir" ]; then
1362                 git_dir="$(cd "$git_dir" && pwd)"
1363         fi
1364         if [ -z "$git_common_dir" ]; then
1365                 if vcmp "$git_version" '>=' "2.5"; then
1366                         # rev-parse --git-common-dir is broken and may give
1367                         # an incorrect result unless the current directory is
1368                         # already set to the top level directory
1369                         git_common_dir="$(cd "./$(git rev-parse --show-cdup)" && cd "$(git rev-parse --git-common-dir)" && pwd)"
1370                 else
1371                         git_common_dir="$git_dir"
1372                 fi
1373         fi
1374         [ -n "$git_dir" ] && [ -n "$git_common_dir" ] &&
1375         [ -d "$git_dir" ] && [ -d "$git_common_dir" ] || die "Not a git repository"
1376         git_hooks_dir="$git_common_dir/hooks"
1377         if vcmp "$git_version" '>=' "2.9" && gchp="$(git config --path --get core.hooksPath 2>/dev/null)" && [ -n "$gchp" ]; then
1378                 case "$gchp" in
1379                         /[!/]*)
1380                                 git_hooks_dir="$gchp"
1381                                 ;;
1382                         *)
1383                                 [ -n "$1" ] || warn "ignoring non-absolute core.hooksPath: $gchp"
1384                                 ;;
1385                 esac
1386                 unset gchp
1387         fi
1388 }
1389
1390 basic_setup()
1391 {
1392         setup_git_dirs $1
1393         [ -n "$base_remote" ] || base_remote="$(git config topgit.remote 2>/dev/null)" || :
1394         tgsequester="$(git config --bool topgit.sequester 2>/dev/null)" || :
1395         tgnosequester=
1396         [ "$tgsequester" != "false" ] || tgnosequester=1
1397         unset tgsequester
1398
1399         # catch errors if topbases is used without being set
1400         unset tg_topbases_set
1401         topbases="programmer*:error"
1402         topbasesrx="programmer*:error}"
1403         oldbases="$topbases"
1404 }
1405
1406 ## Initial setup
1407 initial_setup()
1408 {
1409         # suppress the merge log editor feature since git 1.7.10
1410
1411         GIT_MERGE_AUTOEDIT=no
1412         export GIT_MERGE_AUTOEDIT
1413
1414         basic_setup $1
1415         auhopt=
1416         ! vcmp "$git_version" '>=' "2.9" || auhopt="--allow-unrelated-histories"
1417         root_dir="$(git rev-parse --show-cdup)"; root_dir="${root_dir:-.}"
1418         logrefupdates="$(git config --bool core.logallrefupdates 2>/dev/null)" || :
1419         [ "$logrefupdates" = "true" ] || logrefupdates=
1420
1421         # make sure root_dir doesn't end with a trailing slash.
1422
1423         root_dir="${root_dir%/}"
1424
1425         # make sure global cache directory exists inside GIT_DIR
1426
1427         tg_cache_dir="$git_common_dir/tg-cache"
1428         [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir"
1429
1430         # create global temporary directories, inside GIT_DIR
1431
1432         tg_tmp_dir=
1433         trap 'rm -rf "$tg_tmp_dir"' EXIT
1434         trap 'exit 129' HUP
1435         trap 'exit 130' INT
1436         trap 'exit 131' QUIT
1437         trap 'exit 134' ABRT
1438         trap 'exit 143' TERM
1439         tg_tmp_dir="$(mktemp -d "$git_dir/tg-tmp.XXXXXX")"
1440         tg_ref_cache="$tg_tmp_dir/tg~ref-cache"
1441 }
1442
1443 set_topbases()
1444 {
1445         # refer to "top-bases" in a refname with $topbases
1446
1447         [ -z "$tg_topbases_set" ] || return 0
1448
1449         topbases_implicit_default=1
1450         # See if topgit.top-bases is set to heads or refs
1451         tgtb="$(git config "topgit.top-bases" 2>/dev/null)" || :
1452         if [ -n "$tgtb" ] && [ "$tgtb" != "heads" ] && [ "$tgtb" != "refs" ]; then
1453                 if [ -n "$1" ]; then
1454                         # never die on the hook script
1455                         unset tgtb
1456                 else
1457                         die "invalid \"topgit.top-bases\" setting (must be \"heads\" or \"refs\")"
1458                 fi
1459         fi
1460         if [ -n "$tgtb" ]; then
1461                 case "$tgtb" in
1462                 heads)
1463                         topbases="heads/{top-bases}"
1464                         topbasesrx="heads/[{]top-bases[}]"
1465                         oldbases="top-bases";;
1466                 refs)
1467                         topbases="top-bases"
1468                         topbasesrx="top-bases"
1469                         oldbases="heads/{top-bases}";;
1470                 esac
1471                 # MUST NOT be exported
1472                 unset tgtb tg_topbases_set topbases_implicit_default
1473                 tg_topbases_set=1
1474                 return 0
1475         fi
1476         unset tgtb
1477
1478         # check heads and top-bases and see what state the current
1479         # repository is in.  remotes are ignored.
1480
1481         hblist=" "
1482         topbases=
1483         both=
1484         newtb="heads/{top-bases}"
1485         while read -r rn && [ -n "$rn" ]; do case "$rn" in
1486                 "refs/heads/{top-bases}"/*)
1487                         case "$hblist" in *" ${rn#refs/$newtb/} "*)
1488                                 if [ "$topbases" != "heads/{top-bases}" ] && [ -n "$topbases" ]; then
1489                                         both=1
1490                                         break;
1491                                 else
1492                                         topbases="heads/{top-bases}"
1493                                         topbasesrx="heads/[{]top-bases[}]"
1494                                         oldbases="top-bases"
1495                                 fi
1496                         esac;;
1497                 "refs/top-bases"/*)
1498                         case "$hblist" in *" ${rn#refs/top-bases/} "*)
1499                                 if [ "$topbases" != "top-bases" ] && [ -n "$topbases" ]; then
1500                                         both=1
1501                                         break;
1502                                 else
1503                                         topbases="top-bases"
1504                                         topbasesrx="top-bases"
1505                                         oldbases="heads/{top-bases}"
1506                                 fi
1507                         esac;;
1508                 "refs/heads"/*)
1509                         hblist="$hblist${rn#refs/heads/} ";;
1510         esac; done <<-EOT
1511                 $(git for-each-ref --format='%(refname)' "refs/heads" "refs/top-bases" 2>/dev/null)
1512         EOT
1513         if [ -n "$both" ]; then
1514                 if [ -n "$1" ]; then
1515                         # hook script always prefers newer without complaint
1516                         topbases="heads/{top-bases}"
1517                         topbasesrx="heads/[{]top-bases[}]"
1518                         oldbases="top-bases"
1519                 else
1520                         # Complain and die
1521                         err "repository contains existing TopGit branches"
1522                         err "but some use refs/top-bases/... for the base"
1523                         err "and some use refs/heads/{top-bases}/... for the base"
1524                         err "with the latter being the new, preferred location"
1525                         err "set \"topgit.top-bases\" to either \"heads\" to use"
1526                         err "the new heads/{top-bases} location or \"refs\" to use"
1527                         err "the old top-bases location."
1528                         err "(the tg migrate-bases command can also resolve this issue)"
1529                         die "schizophrenic repository requires topgit.top-bases setting"
1530                 fi
1531         elif [ -n "$topbases" ]; then
1532                 unset topbases_implicit_default
1533         fi
1534
1535         [ -n "$topbases" ] || {
1536                 # default is still top-bases for now
1537                 topbases="top-bases"
1538                 topbasesrx="top-bases"
1539                 oldbases="heads/{top-bases}"
1540         }
1541         # MUST NOT be exported
1542         unset hblist both newtb rn tg_topases_set
1543         tg_topbases_set=1
1544         return 0
1545 }
1546
1547 # init_reflog "ref"
1548 # if "$logrefupdates" is set and ref is not under refs/heads/ then force
1549 # an empty log file to exist so that ref changes will be logged
1550 # "$1" must be a fully-qualified refname (i.e. start with "refs/")
1551 # However, if "$1" is "refs/tgstash" then always make the reflog
1552 # The only ref not under refs/ that Git will write a reflog for is HEAD;
1553 # no matter what, it will NOT update a reflog for any other bare refs so
1554 # just quietly succeed when passed TG_STASH without doing anything.
1555 init_reflog()
1556 {
1557         [ -n "$1" ] && [ "$1" != "TG_STASH" ] || return 0
1558         [ -n "$logrefupdates" ] || [ "$1" = "refs/tgstash" ] || return 0
1559         case "$1" in refs/heads/*|HEAD) return 0;; refs/*[!/]);; *) return 1; esac
1560         mkdir -p "$git_common_dir/logs/${1%/*}" 2>/dev/null || :
1561         { >>"$git_common_dir/logs/$1" || :; } 2>/dev/null
1562  }
1563
1564 # store the "realpath" for "$2" in "$1" except the leaf is not resolved if it's
1565 # a symbolic link.  The directory part must exist, but the basename need not.
1566 v_get_abs_path()
1567 {
1568         [ -n "$1" ] && [ -n "$2" ] || return 1
1569         set -- "$1" "$2" "${2%/}"
1570         case "$3" in
1571                 */*) set -- "$1" "$2" "${3%/*}";;
1572                 *  ) set -- "$1" "$2" ".";;
1573         esac
1574         [ -d "$3" ] || return 1
1575         eval "$1="'"$(cd "$3" && pwd -P)/${2##*/}"'
1576 }
1577
1578 ## Startup
1579
1580 : "${TG_INST_CMDDIR:=@cmddir@}"
1581 : "${TG_INST_SHAREDIR:=@sharedir@}"
1582 : "${TG_INST_HOOKSDIR:=@hooksdir@}"
1583
1584 [ -d "$TG_INST_CMDDIR" ] ||
1585         die "No command directory: '$TG_INST_CMDDIR'"
1586
1587 if [ -n "$tg__include" ]; then
1588
1589         # We were sourced from another script for our utility functions;
1590         # this is set by hooks.  Skip the rest of the file.  A simple return doesn't
1591         # work as expected in every shell.  See http://bugs.debian.org/516188
1592
1593         # ensure setup happens
1594
1595         initial_setup 1
1596         set_topbases 1
1597
1598 else
1599
1600         set -e
1601
1602         tg="$0"
1603         tgdir="${tg%/}"
1604         case "$tgdir" in */*);;*) tgdir="./$tgdir"; esac
1605         tgdir="${tgdir%/*}/"
1606         tgname="${tg##*/}"
1607         [ "$0" != "$tgname" ] || tgdir=""
1608
1609         # If tg contains a '/' but does not start with one then replace it with an absolute path
1610
1611         case "$0" in /*) ;; */*)
1612                 tgdir="$(cd "${0%/*}" && pwd -P)/"
1613                 tg="$tgdir$tgname"
1614         esac
1615
1616         # If the tg in the PATH is the same as "$tg" just display the basename
1617         # tgdisplay will include any explicit -C <dir> option whereas tg will not
1618
1619         tgdisplaydir="$tgdir"
1620         tgdisplay="$tg"
1621         if
1622             v_get_abs_path _tgabs "$tg" &&
1623             v_get_abs_path _tgnameabs "$(cmd_path "$tgname")" &&
1624             [ "$_tgabs" = "$_tgnameabs" ]
1625         then
1626                 tgdisplaydir=""
1627                 tgdisplay="$tgname"
1628         fi
1629         unset _tgabs _tgnameabs
1630
1631         explicit_remote=
1632         explicit_dir=
1633         gitcdopt=
1634         noremote=
1635
1636         cmd=
1637         while :; do case "$1" in
1638
1639                 help|--help|-h)
1640                         cmd=help
1641                         shift
1642                         break;;
1643
1644                 status|--status)
1645                         cmd=status
1646                         shift
1647                         break;;
1648
1649                 --hooks-path)
1650                         cmd=hooks-path
1651                         shift
1652                         break;;
1653
1654                 --top-bases)
1655                         cmd=top-bases
1656                         shift
1657                         break;;
1658
1659                 -r)
1660                         shift
1661                         if [ -z "$1" ]; then
1662                                 echo "Option -r requires an argument." >&2
1663                                 do_help
1664                                 exit 1
1665                         fi
1666                         unset noremote
1667                         base_remote="$1"
1668                         explicit_remote="$base_remote"
1669                         tg="$tgdir$tgname -r $explicit_remote"
1670                         tgdisplay="$tgdisplaydir$tgname"
1671                         [ -z "$explicit_dir" ] || tgdisplay="$tgdisplay -C \"$explicit_dir\""
1672                         tgdisplay="$tgdisplay -r $explicit_remote"
1673                         shift;;
1674
1675                 -u)
1676                         unset base_remote explicit_remote
1677                         noremote=1
1678                         tg="$tgdir$tgname -u"
1679                         tgdisplay="$tgdisplaydir$tgname"
1680                         [ -z "$explicit_dir" ] || tgdisplay="$tgdisplay -C \"$explicit_dir\""
1681                         tgdisplay="$tgdisplay -u"
1682                         shift;;
1683
1684                 -C)
1685                         shift
1686                         if [ -z "$1" ]; then
1687                                 echo "Option -C requires an argument." >&2
1688                                 do_help
1689                                 exit 1
1690                         fi
1691                         cd "$1"
1692                         unset GIT_DIR GIT_COMMON_DIR
1693                         explicit_dir="$1"
1694                         gitcdopt=" -C \"$explicit_dir\""
1695                         tg="$tgdir$tgname"
1696                         tgdisplay="$tgdisplaydir$tgname -C \"$explicit_dir\""
1697                         [ -z "$explicit_remote" ] || tg="$tg -r $explicit_remote"
1698                         [ -z "$explicit_remote" ] || tgdisplay="$tgdisplay -r $explicit_remote"
1699                         [ -z "$noremote" ] || tg="$tg -u"
1700                         [ -z "$noremote" ] || tg="$tgdisplay -u"
1701                         shift;;
1702
1703                 -c)
1704                         shift
1705                         if [ -z "$1" ]; then
1706                                 echo "Option -c requires an argument." >&2
1707                                 do_help
1708                                 exit 1
1709                         fi
1710                         param="'$(printf '%s\n' "$1" | sed "s/[']/'\\\\''/g")'"
1711                         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }$param"
1712                         export GIT_CONFIG_PARAMETERS
1713                         shift;;
1714
1715                 --)
1716                         shift
1717                         break;;
1718
1719                 -*)
1720                         echo "Invalid option $1 (subcommand options must appear AFTER the subcommand)." >&2
1721                         do_help
1722                         exit 1;;
1723
1724                 *)
1725                         break;;
1726
1727         esac; done
1728
1729         [ -n "$cmd" -o $# -lt 1 ] || { cmd="$1"; shift; }
1730
1731         ## Dispatch
1732
1733         [ -n "$cmd" ] || { do_help; exit 1; }
1734
1735         case "$cmd" in
1736
1737                 help)
1738                         do_help "$@"
1739                         exit 0;;
1740
1741                 status)
1742                         unset base_remote
1743                         basic_setup
1744                         set_topbases
1745                         do_status "$@"
1746                         exit ${do_status_result:-0};;
1747
1748                 hooks-path)
1749                         # Internal command
1750                         echol "$TG_INST_HOOKSDIR";;
1751
1752                 top-bases)
1753                         # Maintenance command
1754                         setup_git_dirs
1755                         set_topbases
1756                         echol "refs/$topbases";;
1757
1758                 *)
1759                         isutil=
1760                         case "$cmd" in index-merge-one-file)
1761                                 isutil="-"
1762                         esac
1763                         [ -r "$TG_INST_CMDDIR"/tg-$isutil$cmd ] || {
1764                                 echo "Unknown subcommand: $cmd" >&2
1765                                 do_help
1766                                 exit 1
1767                         }
1768
1769                         showing_help=
1770                         if [ "$*" = "-h" ] || [ "$*" = "--help" ]; then
1771                                 showing_help=1
1772                         fi
1773
1774                         [ -n "$showing_help" ] || initial_setup
1775                         [ -z "$noremote" ] || unset base_remote
1776
1777                         nomergesetup="$showing_help"
1778                         case "$cmd" in base|info|log|summary|rebase|revert|tag)
1779                                 # avoid merge setup where not necessary
1780
1781                                 nomergesetup=1
1782                         esac
1783
1784                         if [ -z "$nomergesetup" ]; then
1785                                 # make sure merging the .top* files will always behave sanely
1786
1787                                 setup_ours
1788                                 setup_hook "pre-commit"
1789                         fi
1790
1791                         # everything but rebase needs topbases set
1792                         carefully="$showing_help"
1793                         [ "$cmd" != "migrate-bases" ] || carefully=1
1794                         [ "$cmd" = "rebase" ] || set_topbases $carefully
1795
1796                         _use_ref_cache=
1797                         tg_read_only=1
1798                         case "$cmd$showing_help" in
1799                                 summary|info|export|tag)
1800                                         _use_ref_cache=1;;
1801                                 annihilate|create|delete|depend|import|update)
1802                                         tg_read_only=;;
1803                         esac
1804                         [ -z "$_use_ref_cache" ] || v_create_ref_cache
1805
1806                         fullcmd="${tgname:-tg} $cmd $*"
1807                         . "$TG_INST_CMDDIR"/tg-$isutil$cmd;;
1808         esac
1809
1810 fi