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 ensure_clean_tree()
 644 {
 645         check_status
 646         [ -z "$tg_state$git_state" ] || { do_status; exit 1; }
 647         git update-index --ignore-submodules --refresh ||
 648                 die "the working directory has uncommitted changes (see above) - first commit or reset them"
 649         [ -z "$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)" ] ||
 650                 die "the index has uncommited changes"
 651 }
 652
 653 # is_sha1 REF
 654 # Whether REF is a SHA1 (compared to a symbolic name).
 655 is_sha1()
 656 {
 657         case "$1" in $octet20) return 0;; esac
 658         return 1
 659 }
 660
 661 # recurse_deps_internal NAME [BRANCHPATH...]
 662 # get recursive list of dependencies with leading 0 if branch exists 1 if missing
 663 # followed by a 1 if the branch is "tgish" or a 0 if not
 664 # followed by a 0 for a non-leaf, 1 for a leaf or 2 for annihilated tgish
 665 # but missing and remotes are always "0"
 666 # then the branch name followed by its depedency chain (which might be empty)
 667 # An output line might look like this:
 668 #   0 1 1 t/foo/leaf t/foo/int t/stage
 669 # If no_remotes is non-empty, exclude remotes
 670 # If recurse_preorder is non-empty, do a preorder rather than postorder traversal
 671 # but the leaf info will always be 0 or 2 in that case
 672 # If with_top_level is non-empty, include the top-level that's normally omitted
 673 # any branch names in the space-separated recurse_deps_exclude variable
 674 # are skipped (along with their dependencies)
 675 recurse_deps_internal()
 676 {
 677         case " $recurse_deps_exclude " in *" $1 "*) return 0; esac
 678         _ref_hash=
 679         if ! _ref_hash="$(ref_exists_rev "refs/heads/$1")"; then
 680                 [ -z "$2" ] || echo "1 0 0 $*"
 681                 return 0
 682         fi
 683
 684         _is_tgish=0
 685         _ref_hash_base=
 686         _is_leaf=0
 687         ! _ref_hash_base="$(ref_exists_rev "refs/$topbases/$1")" || _is_tgish=1
 688         [ "$_is_tgish" = "0" ] || ! branch_annihilated "$1" "$_ref_hash" "$_ref_hash_base" || _is_leaf=2
 689         [ -z "$recurse_preorder" -o -z "${2:-$with_top_level}" ] || echo "0 $_is_tgish $_is_leaf $*"
 690
 691         # If no_remotes is unset also check our base against remote base.
 692         # Checking our head against remote head has to be done in the helper.
 693         if [ "$_is_tgish" = "1" ] && [ -z "$no_remotes" ] && has_remote "${topbases#heads/}/$1"; then
 694                 echo "0 0 0 refs/remotes/$base_remote/${topbases#heads/}/$1 $*"
 695         fi
 696
 697         # if the branch was annihilated, it is considered to have no dependencies
 698         [ "$_is_leaf" = "2" ] || _is_leaf=1
 699         if [ "$_is_tgish" = "1" ] && [ "$_is_leaf" = "1" ]; then
 700                 #TODO: handle nonexisting .topdeps?
 701                 while read _dname && [ -n "$_dname" ]; do
 702                         # Avoid depedency loops
 703                         case " $* " in *" $_dname "*)
 704                                 warn "dependency loop detected in branch $_dname"
 705                                 _is_leaf=0
 706                                 continue
 707                         esac
 708                         # Shoo shoo, leave our environment alone!
 709                         _dep_is_leaf=0
 710                         (recurse_deps_internal "$_dname" "$@") || _dep_is_leaf=$?
 711                         [ "$_dep_is_leaf" = "2" ] || _is_leaf=0
 712                 done <<-EOT
 713                         $(cat_deps "$1")
 714                 EOT
 715         fi
 716
 717         [ -n "$recurse_preorder" -o -z "${2:-$with_top_level}" ] || echo "0 $_is_tgish $_is_leaf $*"
 718         return ${_is_leaf:-0}
 719 }
 720
 721 # do_eval CMD
 722 # helper for recurse_deps so that a return statement executed inside CMD
 723 # does not return from recurse_deps.  This shouldn't be necessary, but it
 724 # seems that it actually is.
 725 do_eval()
 726 {
 727         eval "$@"
 728 }
 729
 730 # becomes read-only for caching purposes
 731 # assigns new value to tg_read_only
 732 # become_cacheable/undo_become_cacheable calls may be nested
 733 become_cacheable()
 734 {
 735         _old_tg_read_only="$tg_read_only"
 736         if [ -z "$tg_read_only" ]; then
 737                 ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 738                 rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 739                 tg_read_only=1
 740         fi
 741         _my_ref_cache=
 742         v_create_ref_cache _my_ref_cache
 743         _my_ref_cache="${_my_ref_cache:+1}"
 744         tg_read_only="undo${_my_ref_cache:-0}-$_old_tg_read_only"
 745 }
 746
 747 # restores tg_read_only and ref_cache to state before become_cacheable call
 748 # become_cacheable/undo_bocome_cacheable calls may be nested
 749 undo_become_cacheable()
 750 {
 751         case "$tg_read_only" in
 752                 "undo"[01]"-"*)
 753                         _suffix="${tg_read_only#undo?-}"
 754                         [ "${tg_read_only%$_suffix}" = "undo0-" ] || remove_ref_cache
 755                         tg_read_only="$_suffix"
 756         esac
 757 }
 758
 759 # just call this, no undo, sets tg_read_only= and removes ref cache and cached results
 760 become_non_cacheable()
 761 {
 762         remove_ref_cache
 763         tg_read_only=
 764         ! [ -e "$tg_tmp_dir/cached" ] && ! [ -e "$tg_tmp_dir/tg~ref-dirs-created" ] ||
 765         rm -rf "$tg_tmp_dir/cached" "$tg_tmp_dir/tg~ref-dirs-created"
 766 }
 767
 768 # call this to make sure Git will not complain about a missing user/email
 769 # result is cached in TG_IDENT_CHECKED and a non-empty value suppresses the check
 770 ensure_ident_available()
 771 {
 772         [ -z "$TG_IDENT_CHECKED" ] || return 0
 773         git var GIT_AUTHOR_IDENT >/dev/null &&
 774         git var GIT_COMMITTER_IDENT >/dev/null || exit
 775         TG_IDENT_CHECKED=1
 776         export TG_IDENT_CHECKED
 777         return 0
 778 }
 779
 780 # recurse_deps CMD NAME [BRANCHPATH...]
 781 # Recursively eval CMD on all dependencies of NAME.
 782 # Dependencies are visited in topological order.
 783 # CMD can refer to $_name for queried branch name,
 784 # $_dep for dependency name,
 785 # $_depchain for space-seperated branch backtrace,
 786 # $_dep_missing boolean to check whether $_dep is present
 787 # and the $_dep_is_tgish and $_dep_annihilated booleans.
 788 # If recurse_preorder is NOT set then the $_dep_is_leaf boolean is also valid.
 789 # It can modify $_ret to affect the return value
 790 # of the whole function.
 791 # If recurse_deps() hits missing dependencies, it will append
 792 # them to space-separated $missing_deps list and skip them
 793 # after calling CMD with _dep_missing set.
 794 # remote dependencies are processed if no_remotes is unset.
 795 # any branch names in the space-separated recurse_deps_exclude variable
 796 # are skipped (along with their dependencies)
 797 recurse_deps()
 798 {
 799         _cmd="$1"; shift
 800
 801         become_cacheable
 802         _depsfile="$(get_temp tg-depsfile)"
 803         recurse_deps_internal "$@" >>"$_depsfile" || :
 804         undo_become_cacheable
 805
 806         _ret=0
 807         while read _ismissing _istgish _isleaf _dep _name _deppath; do
 808                 _depchain="$_name${_deppath:+ $_deppath}"
 809                 _dep_is_tgish=
 810                 [ "$_istgish" = "0" ] || _dep_is_tgish=1
 811                 _dep_missing=
 812                 if [ "$_ismissing" != "0" ]; then
 813                         _dep_missing=1
 814                         case " $missing_deps " in *" $_dep "*);;*)
 815                                 missing_deps="${missing_deps:+$missing_deps }$_dep"
 816                         esac
 817                 fi
 818                 _dep_annihilated=
 819                 _dep_is_leaf=
 820                 if [ "$_isleaf" = "1" ]; then
 821                         _dep_is_leaf=1
 822                 elif [ "$_isleaf" = "2" ]; then
 823                         _dep_annihilated=1
 824                 fi
 825                 do_eval "$_cmd"
 826         done <"$_depsfile"
 827         rm -f "$_depsfile"
 828         return $_ret
 829 }
 830
 831 find_leaves_internal()
 832 {
 833         if [ -n "$_dep_is_leaf" ] && [ -z "$_dep_annihilated" ] && [ -z "$_dep_missing" ]; then
 834                 if [ -n "$_dep_is_tgish" ]; then
 835                         fulldep="refs/$topbases/$_dep"
 836                 else
 837                         fulldep="refs/heads/$_dep"
 838                 fi
 839                 case " $seen_leaf_refs " in *" $fulldep "*);;*)
 840                         seen_leaf_refs="${seen_leaf_refs:+$seen_leaf_refs }$fulldep"
 841                         if fullrev="$(ref_exists_rev "$fulldep")"; then
 842                                 case " $seen_leaf_revs " in *" $fullrev "*);;*)
 843                                         seen_leaf_revs="${seen_leaf_revs:+$seen_leaf_revs }$fullrev"
 844                                         # See if Git knows it by another name
 845                                         if tagname="$(git describe --exact-match "$fullrev" 2>/dev/null)" && [ -n "$tagname" ]; then
 846                                                 echo "refs/tags/$tagname"
 847                                         else
 848                                                 echo "$fulldep"
 849                                         fi
 850                                 esac
 851                         fi
 852                 esac
 853         fi
 854 }
 855
 856 # find_leaves NAME
 857 # output (one per line) the unique leaves of NAME
 858 # a leaf is either
 859 #   1) a non-tgish dependency
 860 #   2) the base of a tgish dependency with no non-annihilated dependencies
 861 # duplicates are suppressed (by commit rev) and remotes are always ignored
 862 # if a leaf has an exact tag match that will be output
 863 # note that recurse_deps_exclude IS honored for this operation
 864 find_leaves()
 865 {
 866         no_remotes=1
 867         with_top_level=1
 868         recurse_preorder=
 869         seen_leaf_refs=
 870         seen_leaf_revs=
 871         recurse_deps find_leaves_internal "$1"
 872         with_top_level=
 873 }
 874
 875 # branch_needs_update
 876 # This is a helper function for determining whether given branch
 877 # is up-to-date wrt. its dependencies. It expects input as if it
 878 # is called as a recurse_deps() helper.
 879 # In case the branch does need update, it will echo it together
 880 # with the branch backtrace on the output (see needs_update()
 881 # description for details) and set $_ret to non-zero.
 882 branch_needs_update()
 883 {
 884         if [ -n "$_dep_missing" ]; then
 885                 echo "! $_dep $_depchain"
 886                 return 0
 887         fi
 888
 889         if [ -n "$_dep_is_tgish" ]; then
 890                 branch_annihilated "$_dep" && return 0
 891
 892                 if has_remote "$_dep"; then
 893                         branch_contains "refs/heads/$_dep" "refs/remotes/$base_remote/$_dep" ||
 894                                 echo "refs/remotes/$base_remote/$_dep $_dep $_depchain"
 895                 fi
 896                 # We want to sync with our base first and should output this before
 897                 # the remote branch, but the order does not actually matter to tg-update
 898                 # as it just recurses regardless, but it does matter for tg-info (which
 899                 # treats out-of-date bases as though they were already merged in) so
 900                 # we output the remote before the base.
 901                 branch_contains "refs/heads/$_dep" "refs/$topbases/$_dep" || {
 902                         echo ": $_dep $_depchain"
 903                         _ret=1
 904                         return
 905                 }
 906         fi
 907
 908         if [ -n "$_name" ]; then
 909                 case "$_dep" in refs/*) _fulldep="$_dep";; *) _fulldep="refs/heads/$_dep";; esac
 910                 if ! branch_contains "refs/$topbases/$_name" "$_fulldep"; then
 911                         # Some new commits in _dep
 912                         echo "$_dep $_depchain"
 913                         _ret=1
 914                 fi
 915         fi
 916 }
 917
 918 # needs_update NAME
 919 # This function is recursive; it outputs reverse path from NAME
 920 # to the branch (e.g. B_DIRTY B1 B2 NAME), one path per line,
 921 # inner paths first. Innermost name can be refs/remotes/<remote>/<name>
 922 # if the head is not in sync with the <remote> branch <name>, ':' if
 923 # the head is not in sync with the base (in this order of priority)
 924 # or '!' if dependency is missing.  Note that the remote branch, base
 925 # order is reversed from the order they will actually be updated in
 926 # order to accomodate tg info which treats out-of-date items that are
 927 # only in the base as already being in the head for status purposes.
 928 # It will also return non-zero status if NAME needs update.
 929 # If needs_update() hits missing dependencies, it will append
 930 # them to space-separated $missing_deps list and skip them.
 931 needs_update()
 932 {
 933         recurse_deps branch_needs_update "$1"
 934 }
 935
 936 # branch_empty NAME [-i | -w]
 937 branch_empty()
 938 {
 939         if [ -z "$2" ]; then
 940                 _rev="$(ref_exists_rev "refs/heads/$1")" || return 0
 941                 _result=
 942                 _result_rev=
 943                 { read -r _result _result_rev <"$tg_cache_dir/$1/.mt"; } 2>/dev/null || :
 944                 [ -z "$_result" -o "$_result_rev" != "$_rev" ] || return $_result
 945                 _result=0
 946                 [ "$(pretty_tree "$1" -b)" = "$(pretty_tree "$1" $2)" ] || _result=$?
 947                 [ -d "$tg_cache_dir/$1" ] || mkdir -p "$tg_cache_dir/$1" 2>/dev/null
 948                 [ ! -d "$tg_cache_dir/$1" ] || echo $_result $_rev >"$tg_cache_dir/$1/.mt"
 949                 return $_result
 950         else
 951                 [ "$(pretty_tree "$1" -b)" = "$(pretty_tree "$1" $2)" ]
 952         fi
 953 }
 954
 955 # list_deps [-i | -w] [BRANCH]
 956 # -i/-w apply only to HEAD
 957 list_deps()
 958 {
 959         head_from=
 960         [ "$1" != "-i" -a "$1" != "-w" ] || { head_from="$1"; shift; }
 961         head="$(git symbolic-ref -q HEAD)" ||
 962                 head="..detached.."
 963
 964         git for-each-ref --format='%(objectname) %(refname)' "refs/$topbases${1:+/$1}" |
 965                 while read rev ref; do
 966                         name="${ref#refs/$topbases/}"
 967                         if branch_annihilated "$name" "" "$rev"; then
 968                                 continue
 969                         fi
 970
 971                         from=$head_from
 972                         [ "refs/heads/$name" = "$head" ] ||
 973                                 from=
 974                         cat_file "refs/heads/$name:.topdeps" $from | while read dep; do
 975                                 dep_is_tgish=true
 976                                 ref_exists "refs/$topbases/$dep" ||
 977                                         dep_is_tgish=false
 978                                 if ! "$dep_is_tgish" || ! branch_annihilated $dep; then
 979                                         echo "$name $dep"
 980                                 fi
 981                         done
 982                 done
 983 }
 984
 985 # switch_to_base NAME [SEED]
 986 switch_to_base()
 987 {
 988         _base="refs/$topbases/$1"; _seed="$2"
 989         # We have to do all the hard work ourselves :/
 990         # This is like git checkout -b "$_base" "$_seed"
 991         # (or just git checkout "$_base"),
 992         # but does not create a detached HEAD.
 993         git read-tree -u -m HEAD "${_seed:-$_base}"
 994         [ -z "$_seed" ] || git update-ref "$_base" "$_seed"
 995         git symbolic-ref HEAD "$_base"
 996 }
 997
 998 # run editor with arguments
 999 # the editor setting will be cached in $tg_editor (which is eval'd)
1000 # result non-zero if editor fails or GIT_EDITOR cannot be determined
1001 run_editor()
1002 {
1003         tg_editor="$GIT_EDITOR"
1004         [ -n "$tg_editor" ] || tg_editor="$(git var GIT_EDITOR)" || return $?
1005         eval "$tg_editor" '"$@"'
1006 }
1007
1008 # Show the help messages.
1009 do_help()
1010 {
1011         _www=
1012         if [ "$1" = "-w" ]; then
1013                 _www=1
1014                 shift
1015         fi
1016         if [ -z "$1" ] ; then
1017                 # This is currently invoked in all kinds of circumstances,
1018                 # including when the user made a usage error. Should we end up
1019                 # providing more than a short help message, then we should
1020                 # differentiate.
1021                 # Petr's comment: http://marc.info/?l=git&m=122718711327376&w=2
1022
1023                 ## Build available commands list for help output
1024
1025                 cmds=
1026                 sep=
1027                 for cmd in "$TG_INST_CMDDIR"/tg-[!-]*; do
1028                         ! [ -r "$cmd" ] && continue
1029                         # strip directory part and "tg-" prefix
1030                         cmd="${cmd##*/}"
1031                         cmd="${cmd#tg-}"
1032                         [ "$cmd" != "migrate-bases" ] || continue
1033                         [ "$cmd" != "summary" ] || cmd="status|$cmd"
1034                         cmds="$cmds$sep$cmd"
1035                         sep="|"
1036                 done
1037
1038                 echo "TopGit version $TG_VERSION - A different patch queue manager"
1039                 echo "Usage: $tgname [-C <dir>] [-r <remote> | -u] [-c <name>=<val>] ($cmds) ..."
1040                 echo "   Or: $tgname help [-w] [<command>]"
1041                 echo "Use \"$tgdisplaydir$tgname help tg\" for overview of TopGit"
1042         elif [ -r "$TG_INST_CMDDIR"/tg-$1 -o -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1043                 if [ -n "$_www" ]; then
1044                         nohtml=
1045                         if ! [ -r "$TG_INST_SHAREDIR/topgit.html" ]; then
1046                                 echo "${0##*/}: missing html help file:" \
1047                                         "$TG_INST_SHAREDIR/topgit.html" 1>&2
1048                                 nohtml=1
1049                         fi
1050                         if ! [ -r "$TG_INST_SHAREDIR/tg-$1.html" ]; then
1051                                 echo "${0##*/}: missing html help file:" \
1052                                         "$TG_INST_SHAREDIR/tg-$1.html" 1>&2
1053                                 nohtml=1
1054                         fi
1055                         if [ -n "$nohtml" ]; then
1056                                 echo "${0##*/}: use" \
1057                                         "\"${0##*/} help $1\" instead" 1>&2
1058                                 exit 1
1059                         fi
1060                         git web--browse -c help.browser "$TG_INST_SHAREDIR/tg-$1.html"
1061                         exit
1062                 fi
1063                 output()
1064                 {
1065                         if [ -r "$TG_INST_CMDDIR"/tg-$1 ] ; then
1066                                 "$TG_INST_CMDDIR"/tg-$1 -h 2>&1 || :
1067                                 echo
1068                         elif [ "$1" = "help" ]; then
1069                                 echo "Usage: ${tgname:-tg} help [-w] [<command>]"
1070                                 echo
1071                         elif [ "$1" = "status" ]; then
1072                                 echo "Usage: ${tgname:-tg} status [-v] [--exit-code]"
1073                                 echo
1074                         fi
1075                         if [ -r "$TG_INST_SHAREDIR/tg-$1.txt" ] ; then
1076                                 cat "$TG_INST_SHAREDIR/tg-$1.txt"
1077                         fi
1078                 }
1079                 page output "$1"
1080         else
1081                 echo "${0##*/}: no help for $1" 1>&2
1082                 do_help
1083                 exit 1
1084         fi
1085 }
1086
1087 check_status()
1088 {
1089         git_state=
1090         git_remove=
1091         if [ -e "$git_dir/MERGE_HEAD" ]; then
1092                 git_state="merge"
1093         elif [ -e "$git_dir/rebase-apply/applying" ]; then
1094                 git_state="am"
1095                 git_remove="$git_dir/rebase-apply"
1096         elif [ -e "$git_dir/rebase-apply" ]; then
1097                 git_state="rebase"
1098                 git_remove="$git_dir/rebase-apply"
1099         elif [ -e "$git_dir/rebase-merge" ]; then
1100                 git_state="rebase"
1101                 git_remove="$git_dir/rebase-merge"
1102         elif [ -e "$git_dir/CHERRY_PICK_HEAD" ]; then
1103                 git_state="cherry-pick"
1104         elif [ -e "$git_dir/BISECT_LOG" ]; then
1105                 git_state="bisect"
1106         elif [ -e "$git_dir/REVERT_HEAD" ]; then
1107                 git_state="revert"
1108         fi
1109         git_remove="${git_remove#./}"
1110
1111         tg_state=
1112         tg_remove=
1113         if [ -e "$git_dir/tg-update" ]; then
1114                 tg_state="update"
1115                 tg_remove="$git_dir/tg-update"
1116         fi
1117         tg_remove="${tg_remove#./}"
1118 }
1119
1120 # Show status information
1121 do_status()
1122 {
1123         do_status_result=0
1124         do_status_verbose=
1125         while [ $# -gt 0 ] && case "$1" in
1126                 --verbose|-v)
1127                         do_status_verbose=1
1128                         ;;
1129                 --exit-code)
1130                         do_status_result=2
1131                         ;;
1132                 *)
1133                         die "unknown status argument: $1"
1134                         ;;
1135         esac; do shift; done
1136         check_status
1137         symref="$(git symbolic-ref --quiet HEAD)" || :
1138         headrv="$(git rev-parse --quiet --verify --short HEAD --)" || :
1139         if [ -n "$symref" ]; then
1140                 echol "HEAD -> $symref (${headrv:-unborn})"
1141         else
1142                 echol "HEAD -> ${headrv:-?}"
1143         fi
1144         if [ -n "$tg_state" ]; then
1145                 extra=
1146                 if [ "$tg_state" = "update" ]; then
1147                         IFS= read -r uname <"$git_dir/tg-update/name" || :
1148                         [ -z "$uname" ] ||
1149                         extra="; currently updating branch '$uname'"
1150                 fi
1151                 echol "tg $tg_state in progress$extra"
1152                 if [ -s "$git_dir/tg-update/fullcmd" ] && [ -s "$git_dir/tg-update/names" ]; then
1153                         printf 'You are currently updating as a result of:\n  '
1154                         cat "$git_dir/tg-update/fullcmd"
1155                         bcnt="$(( $(wc -w < "$git_dir/tg-update/names") ))"
1156                         if [ $bcnt -gt 1 ]; then
1157                                 pcnt=0
1158                                 ! [ -s "$git_dir/tg-update/processed" ] ||
1159                                 pcnt="$(( $(wc -w < "$git_dir/tg-update/processed") ))"
1160                                 echo "$pcnt of $bcnt branches updated so far"
1161                         fi
1162                 fi
1163                 if [ "$tg_state" = "update" ]; then
1164                         echol '  (use "tg update --continue" to continue)'
1165                         echol '  (use "tg update --skip" to skip this branch and continue)'
1166                         echol '  (use "tg update --stop" to stop and retain updates so far)'
1167                         echol '  (use "tg update --abort" to restore pre-update state)'
1168                 fi
1169         fi
1170         [ -z "$git_state" ] || echo "git $git_state in progress"
1171         if [ "$git_state" = "merge" ]; then
1172                 ucnt="$(( $(git ls-files --unmerged --full-name --abbrev :/ | wc -l) ))"
1173                 if [ $ucnt -gt 0 ]; then
1174                         echo 'fix conflicts and then "git commit" the result'
1175                 else
1176                         echo 'all conflicts fixed; run "git commit" to record result'
1177                 fi
1178         fi
1179         if [ -z "$git_state" ]; then
1180                 ccnt="$(( $(git status --porcelain -uno | wc -l) ))"
1181                 untr=
1182                 if [ "$ccnt" -eq 0 ]; then
1183                         if git status --porcelain | grep -q '^[?]'; then
1184                                 untr="; non-ignored, untracked files present"
1185                         fi
1186                         echo "working directory is clean$untr"
1187                         [ -n "$tg_state" ] || do_status_result=0
1188                 else
1189                         echo "working directory is DIRTY"
1190                 fi
1191         fi
1192 }
1193
1194 ## Pager stuff
1195
1196 # isatty FD
1197 isatty()
1198 {
1199         test -t $1
1200 }
1201
1202 # pass "diff" to get pager.diff
1203 # if pager.$1 is a boolean false returns cat
1204 # if set to true or unset fails
1205 # otherwise succeeds and returns the value
1206 get_pager()
1207 {
1208         if _x="$(git config --bool "pager.$1" 2>/dev/null)"; then
1209                 [ "$_x" != "true" ] || return 1
1210                 echo "cat"
1211                 return 0
1212         fi
1213         if _x="$(git config "pager.$1" 2>/dev/null)"; then
1214                 echol "$_x"
1215                 return 0
1216         fi
1217         return 1
1218 }
1219
1220 # setup_pager
1221 # Set TG_PAGER to a valid executable
1222 # After calling, code to be paged should be surrounded with {...} | eval "$TG_PAGER"
1223 # See also the following "page" function for ease of use
1224 # emptypager will be set to 1 (otherwise empty) if TG_PAGER was set to "cat" to not be empty
1225 # Preference is (same as Git):
1226 #   1. GIT_PAGER
1227 #   2. pager.$USE_PAGER_TYPE (but only if USE_PAGER_TYPE is set and so is pager.$USE_PAGER_TYPE)
1228 #   3. core.pager (only if set)
1229 #   4. PAGER
1230 #   5. git var GIT_PAGER
1231 #   6. less
1232 setup_pager()
1233 {
1234         isatty 1 || { emptypager=1; TG_PAGER=cat; return 0; }
1235
1236         emptypager=
1237         if [ -z "$TG_PAGER_IN_USE" ]; then
1238                 # TG_PAGER = GIT_PAGER | PAGER | less
1239                 # NOTE: GIT_PAGER='' is significant
1240                 if [ -n "${GIT_PAGER+set}" ]; then
1241                         TG_PAGER="$GIT_PAGER"
1242                 elif [ -n "$USE_PAGER_TYPE" ] && _dp="$(get_pager "$USE_PAGER_TYPE")"; then
1243                         TG_PAGER="$_dp"
1244                 elif _cp="$(git config core.pager 2>/dev/null)"; then
1245                         TG_PAGER="$_cp"
1246                 elif [ -n "${PAGER+set}" ]; then
1247                         TG_PAGER="$PAGER"
1248                 else
1249                         _gp="$(git var GIT_PAGER 2>/dev/null)" || :
1250                         [ "$_gp" != ":" ] || _gp=
1251                         TG_PAGER="${_gp:-less}"
1252                 fi
1253                 if [ -z "$TG_PAGER" ]; then
1254                         emptypager=1
1255                         TG_PAGER=cat
1256                 fi
1257         else
1258                 emptypager=1
1259                 TG_PAGER=cat
1260         fi
1261
1262         # Set pager default environment variables
1263         # see pager.c:setup_pager
1264         if [ -z "${LESS+set}" ]; then
1265                 LESS="-FRX"
1266                 export LESS
1267         fi
1268         if [ -z "${LV+set}" ]; then
1269                 LV="-c"
1270                 export LV
1271         fi
1272
1273         # this is needed so e.g. $(git diff) will still colorize it's output if
1274         # requested in ~/.gitconfig with color.diff=auto
1275         GIT_PAGER_IN_USE=1
1276         export GIT_PAGER_IN_USE
1277
1278         # this is needed so we don't get nested pagers
1279         TG_PAGER_IN_USE=1
1280         export TG_PAGER_IN_USE
1281 }
1282
1283 # page eval_arg [arg ...]
1284 #
1285 # Calls setup_pager then evals the first argument passing it all the rest
1286 # where the output is piped through eval "$TG_PAGER" unless emptypager is set
1287 # by setup_pager (in which case the output is left as-is).
1288 #
1289 # To handle arbitrary paging duties, collect lines to be paged into a
1290 # function and then call page with the function name or perhaps func_name "$@".
1291 #
1292 # If no arguments at all are passed in do nothing (return with success).
1293 page()
1294 {
1295         [ $# -gt 0 ] || return 0
1296         setup_pager
1297         _evalarg="$1"; shift
1298         if [ -n "$emptypager" ]; then
1299                 eval "$_evalarg" '"$@"'
1300         else
1301                 eval "$_evalarg" '"$@"' | eval "$TG_PAGER"
1302         fi
1303 }
1304
1305 # get_temp NAME [-d]
1306 # creates a new temporary file (or directory with -d) in the global
1307 # temporary directory $tg_tmp_dir with pattern prefix NAME
1308 get_temp()
1309 {
1310         mktemp $2 "$tg_tmp_dir/$1.XXXXXX"
1311 }
1312
1313 # automatically called by strftime
1314 # does nothing if already setup
1315 # may be called explicitly if the first call would otherwise be in a subshell
1316 # so that the setup is only done once before subshells start being spawned
1317 setup_strftime()
1318 {
1319         [ -z "$strftime_is_setup" ] || return 0
1320
1321         # date option to format raw epoch seconds values
1322         daterawopt=
1323         _testes='951807788'
1324         _testdt='2000-02-29 07:03:08 UTC'
1325         _testfm='%Y-%m-%d %H:%M:%S %Z'
1326         if [ "$(TZ=UTC date "-d@$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1327                 daterawopt='-d@'
1328         elif [ "$(TZ=UTC date "-r$_testes" "+$_testfm" 2>/dev/null)" = "$_testdt" ]; then
1329                 daterawopt='-r'
1330         fi
1331         strftime_is_setup=1
1332 }
1333
1334 # $1 => strftime format string to use
1335 # $2 => raw timestamp as seconds since epoch
1336 # $3 => optional time zone string (empty/absent for local time zone)
1337 strftime()
1338 {
1339         setup_strftime
1340         if [ -n "$daterawopt" ]; then
1341                 if [ -n "$3" ]; then
1342                         TZ="$3" date "$daterawopt$2" "+$1"
1343                 else
1344                         date "$daterawopt$2" "+$1"
1345                 fi
1346         else
1347                 if [ -n "$3" ]; then
1348                         TZ="$3" perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1349                 else
1350                         perl -MPOSIX=strftime -le 'print strftime($ARGV[0],localtime($ARGV[1]))' "$1" "$2"
1351                 fi
1352         fi
1353 }
1354
1355 setup_git_dirs()
1356 {
1357         [ -n "$git_dir" ] || git_dir="$(git rev-parse --git-dir)"
1358         if [ -n "$git_dir" ] && [ -d "$git_dir" ]; then
1359                 git_dir="$(cd "$git_dir" && pwd)"
1360         fi
1361         if [ -z "$git_common_dir" ]; then
1362                 if vcmp "$git_version" '>=' "2.5"; then
1363                         # rev-parse --git-common-dir is broken and may give
1364                         # an incorrect result unless the current directory is
1365                         # already set to the top level directory
1366                         git_common_dir="$(cd "./$(git rev-parse --show-cdup)" && cd "$(git rev-parse --git-common-dir)" && pwd)"
1367                 else
1368                         git_common_dir="$git_dir"
1369                 fi
1370         fi
1371         [ -n "$git_dir" ] && [ -n "$git_common_dir" ] &&
1372         [ -d "$git_dir" ] && [ -d "$git_common_dir" ] || die "Not a git repository"
1373         git_hooks_dir="$git_common_dir/hooks"
1374         if vcmp "$git_version" '>=' "2.9" && gchp="$(git config --path --get core.hooksPath 2>/dev/null)" && [ -n "$gchp" ]; then
1375                 case "$gchp" in
1376                         /[!/]*)
1377                                 git_hooks_dir="$gchp"
1378                                 ;;
1379                         *)
1380                                 [ -n "$1" ] || warn "ignoring non-absolute core.hooksPath: $gchp"
1381                                 ;;
1382                 esac
1383                 unset gchp
1384         fi
1385 }
1386
1387 basic_setup()
1388 {
1389         setup_git_dirs $1
1390         [ -n "$base_remote" ] || base_remote="$(git config topgit.remote 2>/dev/null)" || :
1391         tgsequester="$(git config --bool topgit.sequester 2>/dev/null)" || :
1392         tgnosequester=
1393         [ "$tgsequester" != "false" ] || tgnosequester=1
1394         unset tgsequester
1395
1396         # catch errors if topbases is used without being set
1397         unset tg_topbases_set
1398         topbases="programmer*:error"
1399         topbasesrx="programmer*:error}"
1400         oldbases="$topbases"
1401 }
1402
1403 ## Initial setup
1404 initial_setup()
1405 {
1406         # suppress the merge log editor feature since git 1.7.10
1407
1408         GIT_MERGE_AUTOEDIT=no
1409         export GIT_MERGE_AUTOEDIT
1410
1411         basic_setup $1
1412         auhopt=
1413         ! vcmp "$git_version" '>=' "2.9" || auhopt="--allow-unrelated-histories"
1414         root_dir="$(git rev-parse --show-cdup)"; root_dir="${root_dir:-.}"
1415         logrefupdates="$(git config --bool core.logallrefupdates 2>/dev/null)" || :
1416         [ "$logrefupdates" = "true" ] || logrefupdates=
1417
1418         # make sure root_dir doesn't end with a trailing slash.
1419
1420         root_dir="${root_dir%/}"
1421
1422         # make sure global cache directory exists inside GIT_DIR
1423
1424         tg_cache_dir="$git_common_dir/tg-cache"
1425         [ -d "$tg_cache_dir" ] || mkdir "$tg_cache_dir"
1426
1427         # create global temporary directories, inside GIT_DIR
1428
1429         tg_tmp_dir=
1430         trap 'rm -rf "$tg_tmp_dir"' EXIT
1431         trap 'exit 129' HUP
1432         trap 'exit 130' INT
1433         trap 'exit 131' QUIT
1434         trap 'exit 134' ABRT
1435         trap 'exit 143' TERM
1436         tg_tmp_dir="$(mktemp -d "$git_dir/tg-tmp.XXXXXX")"
1437         tg_ref_cache="$tg_tmp_dir/tg~ref-cache"
1438 }
1439
1440 set_topbases()
1441 {
1442         # refer to "top-bases" in a refname with $topbases
1443
1444         [ -z "$tg_topbases_set" ] || return 0
1445
1446         topbases_implicit_default=1
1447         # See if topgit.top-bases is set to heads or refs
1448         tgtb="$(git config "topgit.top-bases" 2>/dev/null)" || :
1449         if [ -n "$tgtb" ] && [ "$tgtb" != "heads" ] && [ "$tgtb" != "refs" ]; then
1450                 if [ -n "$1" ]; then
1451                         # never die on the hook script
1452                         unset tgtb
1453                 else
1454                         die "invalid \"topgit.top-bases\" setting (must be \"heads\" or \"refs\")"
1455                 fi
1456         fi
1457         if [ -n "$tgtb" ]; then
1458                 case "$tgtb" in
1459                 heads)
1460                         topbases="heads/{top-bases}"
1461                         topbasesrx="heads/[{]top-bases[}]"
1462                         oldbases="top-bases";;
1463                 refs)
1464                         topbases="top-bases"
1465                         topbasesrx="top-bases"
1466                         oldbases="heads/{top-bases}";;
1467                 esac
1468                 # MUST NOT be exported
1469                 unset tgtb tg_topbases_set topbases_implicit_default
1470                 tg_topbases_set=1
1471                 return 0
1472         fi
1473         unset tgtb
1474
1475         # check heads and top-bases and see what state the current
1476         # repository is in.  remotes are ignored.
1477
1478         hblist=" "
1479         topbases=
1480         both=
1481         newtb="heads/{top-bases}"
1482         while read -r rn && [ -n "$rn" ]; do case "$rn" in
1483                 "refs/heads/{top-bases}"/*)
1484                         case "$hblist" in *" ${rn#refs/$newtb/} "*)
1485                                 if [ "$topbases" != "heads/{top-bases}" ] && [ -n "$topbases" ]; then
1486                                         both=1
1487                                         break;
1488                                 else
1489                                         topbases="heads/{top-bases}"
1490                                         topbasesrx="heads/[{]top-bases[}]"
1491                                         oldbases="top-bases"
1492                                 fi
1493                         esac;;
1494                 "refs/top-bases"/*)
1495                         case "$hblist" in *" ${rn#refs/top-bases/} "*)
1496                                 if [ "$topbases" != "top-bases" ] && [ -n "$topbases" ]; then
1497                                         both=1
1498                                         break;
1499                                 else
1500                                         topbases="top-bases"
1501                                         topbasesrx="top-bases"
1502                                         oldbases="heads/{top-bases}"
1503                                 fi
1504                         esac;;
1505                 "refs/heads"/*)
1506                         hblist="$hblist${rn#refs/heads/} ";;
1507         esac; done <<-EOT
1508                 $(git for-each-ref --format='%(refname)' "refs/heads" "refs/top-bases" 2>/dev/null)
1509         EOT
1510         if [ -n "$both" ]; then
1511                 if [ -n "$1" ]; then
1512                         # hook script always prefers newer without complaint
1513                         topbases="heads/{top-bases}"
1514                         topbasesrx="heads/[{]top-bases[}]"
1515                         oldbases="top-bases"
1516                 else
1517                         # Complain and die
1518                         err "repository contains existing TopGit branches"
1519                         err "but some use refs/top-bases/... for the base"
1520                         err "and some use refs/heads/{top-bases}/... for the base"
1521                         err "with the latter being the new, preferred location"
1522                         err "set \"topgit.top-bases\" to either \"heads\" to use"
1523                         err "the new heads/{top-bases} location or \"refs\" to use"
1524                         err "the old top-bases location."
1525                         err "(the tg migrate-bases command can also resolve this issue)"
1526                         die "schizophrenic repository requires topgit.top-bases setting"
1527                 fi
1528         elif [ -n "$topbases" ]; then
1529                 unset topbases_implicit_default
1530         fi
1531
1532         [ -n "$topbases" ] || {
1533                 # default is still top-bases for now
1534                 topbases="top-bases"
1535                 topbasesrx="top-bases"
1536                 oldbases="heads/{top-bases}"
1537         }
1538         # MUST NOT be exported
1539         unset hblist both newtb rn tg_topases_set
1540         tg_topbases_set=1
1541         return 0
1542 }
1543
1544 # init_reflog "ref"
1545 # if "$logrefupdates" is set and ref is not under refs/heads/ then force
1546 # an empty log file to exist so that ref changes will be logged
1547 # "$1" must be a fully-qualified refname (i.e. start with "refs/")
1548 # However, if "$1" is "refs/tgstash" then always make the reflog
1549 # The only ref not under refs/ that Git will write a reflog for is HEAD;
1550 # no matter what, it will NOT update a reflog for any other bare refs so
1551 # just quietly succeed when passed TG_STASH without doing anything.
1552 init_reflog()
1553 {
1554         [ -n "$1" ] && [ "$1" != "TG_STASH" ] || return 0
1555         [ -n "$logrefupdates" ] || [ "$1" = "refs/tgstash" ] || return 0
1556         case "$1" in refs/heads/*|HEAD) return 0;; refs/*[!/]);; *) return 1; esac
1557         mkdir -p "$git_common_dir/logs/${1%/*}" 2>/dev/null || :
1558         { >>"$git_common_dir/logs/$1" || :; } 2>/dev/null
1559  }
1560
1561 # store the "realpath" for "$2" in "$1" except the leaf is not resolved if it's
1562 # a symbolic link.  The directory part must exist, but the basename need not.
1563 v_get_abs_path()
1564 {
1565         [ -n "$1" ] && [ -n "$2" ] || return 1
1566         set -- "$1" "$2" "${2%/}"
1567         case "$3" in
1568                 */*) set -- "$1" "$2" "${3%/*}";;
1569                 *  ) set -- "$1" "$2" ".";;
1570         esac
1571         [ -d "$3" ] || return 1
1572         eval "$1="'"$(cd "$3" && pwd -P)/${2##*/}"'
1573 }
1574
1575 ## Startup
1576
1577 : "${TG_INST_CMDDIR:=@cmddir@}"
1578 : "${TG_INST_SHAREDIR:=@sharedir@}"
1579 : "${TG_INST_HOOKSDIR:=@hooksdir@}"
1580
1581 [ -d "$TG_INST_CMDDIR" ] ||
1582         die "No command directory: '$TG_INST_CMDDIR'"
1583
1584 if [ -n "$tg__include" ]; then
1585
1586         # We were sourced from another script for our utility functions;
1587         # this is set by hooks.  Skip the rest of the file.  A simple return doesn't
1588         # work as expected in every shell.  See http://bugs.debian.org/516188
1589
1590         # ensure setup happens
1591
1592         initial_setup 1
1593         set_topbases 1
1594
1595 else
1596
1597         set -e
1598
1599         tg="$0"
1600         tgdir="${tg%/}"
1601         case "$tgdir" in */*);;*) tgdir="./$tgdir"; esac
1602         tgdir="${tgdir%/*}/"
1603         tgname="${tg##*/}"
1604         [ "$0" != "$tgname" ] || tgdir=""
1605
1606         # If tg contains a '/' but does not start with one then replace it with an absolute path
1607
1608         case "$0" in /*) ;; */*)
1609                 tgdir="$(cd "${0%/*}" && pwd -P)/"
1610                 tg="$tgdir$tgname"
1611         esac
1612
1613         # If the tg in the PATH is the same as "$tg" just display the basename
1614         # tgdisplay will include any explicit -C <dir> option whereas tg will not
1615
1616         tgdisplaydir="$tgdir"
1617         tgdisplay="$tg"
1618         if
1619             v_get_abs_path _tgabs "$tg" &&
1620             v_get_abs_path _tgnameabs "$(cmd_path "$tgname")" &&
1621             [ "$_tgabs" = "$_tgnameabs" ]
1622         then
1623                 tgdisplaydir=""
1624                 tgdisplay="$tgname"
1625         fi
1626         unset _tgabs _tgnameabs
1627
1628         explicit_remote=
1629         explicit_dir=
1630         gitcdopt=
1631         noremote=
1632
1633         cmd=
1634         while :; do case "$1" in
1635
1636                 help|--help|-h)
1637                         cmd=help
1638                         shift
1639                         break;;
1640
1641                 status|--status)
1642                         cmd=status
1643                         shift
1644                         break;;
1645
1646                 --hooks-path)
1647                         cmd=hooks-path
1648                         shift
1649                         break;;
1650
1651                 --top-bases)
1652                         cmd=top-bases
1653                         shift
1654                         break;;
1655
1656                 -r)
1657                         shift
1658                         if [ -z "$1" ]; then
1659                                 echo "Option -r requires an argument." >&2
1660                                 do_help
1661                                 exit 1
1662                         fi
1663                         unset noremote
1664                         base_remote="$1"
1665                         explicit_remote="$base_remote"
1666                         tg="$tgdir$tgname -r $explicit_remote"
1667                         tgdisplay="$tgdisplaydir$tgname"
1668                         [ -z "$explicit_dir" ] || tgdisplay="$tgdisplay -C \"$explicit_dir\""
1669                         tgdisplay="$tgdisplay -r $explicit_remote"
1670                         shift;;
1671
1672                 -u)
1673                         unset base_remote explicit_remote
1674                         noremote=1
1675                         tg="$tgdir$tgname -u"
1676                         tgdisplay="$tgdisplaydir$tgname"
1677                         [ -z "$explicit_dir" ] || tgdisplay="$tgdisplay -C \"$explicit_dir\""
1678                         tgdisplay="$tgdisplay -u"
1679                         shift;;
1680
1681                 -C)
1682                         shift
1683                         if [ -z "$1" ]; then
1684                                 echo "Option -C requires an argument." >&2
1685                                 do_help
1686                                 exit 1
1687                         fi
1688                         cd "$1"
1689                         unset GIT_DIR GIT_COMMON_DIR
1690                         explicit_dir="$1"
1691                         gitcdopt=" -C \"$explicit_dir\""
1692                         tg="$tgdir$tgname"
1693                         tgdisplay="$tgdisplaydir$tgname -C \"$explicit_dir\""
1694                         [ -z "$explicit_remote" ] || tg="$tg -r $explicit_remote"
1695                         [ -z "$explicit_remote" ] || tgdisplay="$tgdisplay -r $explicit_remote"
1696                         [ -z "$noremote" ] || tg="$tg -u"
1697                         [ -z "$noremote" ] || tg="$tgdisplay -u"
1698                         shift;;
1699
1700                 -c)
1701                         shift
1702                         if [ -z "$1" ]; then
1703                                 echo "Option -c requires an argument." >&2
1704                                 do_help
1705                                 exit 1
1706                         fi
1707                         param="'$(printf '%s\n' "$1" | sed "s/[']/'\\\\''/g")'"
1708                         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }$param"
1709                         export GIT_CONFIG_PARAMETERS
1710                         shift;;
1711
1712                 --)
1713                         shift
1714                         break;;
1715
1716                 -*)
1717                         echo "Invalid option $1 (subcommand options must appear AFTER the subcommand)." >&2
1718                         do_help
1719                         exit 1;;
1720
1721                 *)
1722                         break;;
1723
1724         esac; done
1725
1726         [ -n "$cmd" -o $# -lt 1 ] || { cmd="$1"; shift; }
1727
1728         ## Dispatch
1729
1730         [ -n "$cmd" ] || { do_help; exit 1; }
1731
1732         case "$cmd" in
1733
1734                 help)
1735                         do_help "$@"
1736                         exit 0;;
1737
1738                 status)
1739                         unset base_remote
1740                         basic_setup
1741                         set_topbases
1742                         do_status "$@"
1743                         exit ${do_status_result:-0};;
1744
1745                 hooks-path)
1746                         # Internal command
1747                         echol "$TG_INST_HOOKSDIR";;
1748
1749                 top-bases)
1750                         # Maintenance command
1751                         setup_git_dirs
1752                         set_topbases
1753                         echol "refs/$topbases";;
1754
1755                 *)
1756                         isutil=
1757                         case "$cmd" in index-merge-one-file)
1758                                 isutil="-"
1759                         esac
1760                         [ -r "$TG_INST_CMDDIR"/tg-$isutil$cmd ] || {
1761                                 echo "Unknown subcommand: $cmd" >&2
1762                                 do_help
1763                                 exit 1
1764                         }
1765
1766                         showing_help=
1767                         if [ "$*" = "-h" ] || [ "$*" = "--help" ]; then
1768                                 showing_help=1
1769                         fi
1770
1771                         [ -n "$showing_help" ] || initial_setup
1772                         [ -z "$noremote" ] || unset base_remote
1773
1774                         nomergesetup="$showing_help"
1775                         case "$cmd" in base|info|log|summary|rebase|revert|tag)
1776                                 # avoid merge setup where not necessary
1777
1778                                 nomergesetup=1
1779                         esac
1780
1781                         if [ -z "$nomergesetup" ]; then
1782                                 # make sure merging the .top* files will always behave sanely
1783
1784                                 setup_ours
1785                                 setup_hook "pre-commit"
1786                         fi
1787
1788                         # everything but rebase needs topbases set
1789                         carefully="$showing_help"
1790                         [ "$cmd" != "migrate-bases" ] || carefully=1
1791                         [ "$cmd" = "rebase" ] || set_topbases $carefully
1792
1793                         _use_ref_cache=
1794                         tg_read_only=1
1795                         case "$cmd$showing_help" in
1796                                 summary|info|export|tag)
1797                                         _use_ref_cache=1;;
1798                                 annihilate|create|delete|depend|import|update)
1799                                         tg_read_only=;;
1800                         esac
1801                         [ -z "$_use_ref_cache" ] || v_create_ref_cache
1802
1803                         fullcmd="${tgname:-tg} $cmd $*"
1804                         . "$TG_INST_CMDDIR"/tg-$isutil$cmd;;
1805         esac
1806
1807 fi