git-legacy-rebase.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano.
   4 #
   5
   6 SUBDIRECTORY_OK=Yes
   7 OPTIONS_KEEPDASHDASH=
   8 OPTIONS_STUCKLONG=t
   9 OPTIONS_SPEC="\
  10 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] [<upstream>] [<branch>]
  11 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] --root [<branch>]
  12 git rebase --continue | --abort | --skip | --edit-todo
  13 --
  14  Available options are
  15 v,verbose!         display a diffstat of what changed upstream
  16 q,quiet!           be quiet. implies --no-stat
  17 autostash          automatically stash/stash pop before and after
  18 fork-point         use 'merge-base --fork-point' to refine upstream
  19 onto=!             rebase onto given branch instead of upstream
  20 r,rebase-merges?   try to rebase merges instead of skipping them
  21 p,preserve-merges! try to recreate merges instead of ignoring them
  22 s,strategy=!       use the given merge strategy
  23 X,strategy-option=! pass the argument through to the merge strategy
  24 no-ff!             cherry-pick all commits, even if unchanged
  25 f,force-rebase!    cherry-pick all commits, even if unchanged
  26 m,merge!           use merging strategies to rebase
  27 i,interactive!     let the user edit the list of commits to rebase
  28 x,exec=!           add exec lines after each commit of the editable list
  29 y=!                same as --reschedule-failed-exec -x
  30 k,keep-empty       preserve empty commits during rebase
  31 allow-empty-message allow rebasing commits with empty messages
  32 stat!              display a diffstat of what changed upstream
  33 n,no-stat!         do not show diffstat of what changed upstream
  34 verify             allow pre-rebase hook to run
  35 rerere-autoupdate  allow rerere to update index with resolved conflicts
  36 root!              rebase all reachable commits up to the root(s)
  37 autosquash         move commits that begin with squash!/fixup! under -i
  38 signoff            add a Signed-off-by: line to each commit
  39 committer-date-is-author-date! passed to 'git am'
  40 ignore-date!       passed to 'git am'
  41 whitespace=!       passed to 'git apply'
  42 ignore-whitespace! passed to 'git apply'
  43 C=!                passed to 'git apply'
  44 S,gpg-sign?        GPG-sign commits
  45  Actions:
  46 continue!          continue
  47 abort!             abort and check out the original branch
  48 skip!              skip current patch and continue
  49 edit-todo!         edit the todo list during an interactive rebase
  50 quit!              abort but keep HEAD where it is
  51 show-current-patch! show the patch file being applied or merged
  52 reschedule-failed-exec automatically reschedule failed exec commands
  53 "
  54 . git-sh-setup
  55 set_reflog_action rebase
  56 require_work_tree_exists
  57 cd_to_toplevel
  58
  59 LF='
  60 '
  61 ok_to_skip_pre_rebase=
  62
  63 squash_onto=
  64 unset onto
  65 unset restrict_revision
  66 cmd=
  67 strategy=
  68 strategy_opts=
  69 do_merge=
  70 merge_dir="$GIT_DIR"/rebase-merge
  71 apply_dir="$GIT_DIR"/rebase-apply
  72 verbose=
  73 diffstat=
  74 test "$(git config --bool rebase.stat)" = true && diffstat=t
  75 autostash="$(git config --bool rebase.autostash || echo false)"
  76 fork_point=auto
  77 git_am_opt=
  78 git_format_patch_opt=
  79 rebase_root=
  80 force_rebase=
  81 allow_rerere_autoupdate=
  82 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  83 in_progress=
  84 # One of {am, merge, interactive}
  85 type=
  86 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  87 state_dir=
  88 # One of {'', continue, skip, abort}, as parsed from command line
  89 action=
  90 rebase_merges=
  91 rebase_cousins=
  92 preserve_merges=
  93 autosquash=
  94 keep_empty=
  95 allow_empty_message=--allow-empty-message
  96 signoff=
  97 reschedule_failed_exec=
  98 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  99 case "$(git config --bool commit.gpgsign)" in
 100 true)   gpg_sign_opt=-S ;;
 101 *)      gpg_sign_opt= ;;
 102 esac
 103 test "$(git config --bool rebase.reschedulefailedexec)" = "true" &&
 104 reschedule_failed_exec=--reschedule-failed-exec
 105 . git-rebase--common
 106
 107 read_basic_state () {
 108         test -f "$state_dir/head-name" &&
 109         test -f "$state_dir/onto" &&
 110         head_name=$(cat "$state_dir"/head-name) &&
 111         onto=$(cat "$state_dir"/onto) &&
 112         # We always write to orig-head, but interactive rebase used to write to
 113         # head. Fall back to reading from head to cover for the case that the
 114         # user upgraded git with an ongoing interactive rebase.
 115         if test -f "$state_dir"/orig-head
 116         then
 117                 orig_head=$(cat "$state_dir"/orig-head)
 118         else
 119                 orig_head=$(cat "$state_dir"/head)
 120         fi &&
 121         test -f "$state_dir"/quiet && GIT_QUIET=t
 122         test -f "$state_dir"/verbose && verbose=t
 123         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
 124         test -f "$state_dir"/strategy_opts &&
 125                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
 126         test -f "$state_dir"/allow_rerere_autoupdate &&
 127                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
 128         test -f "$state_dir"/gpg_sign_opt &&
 129                 gpg_sign_opt="$(cat "$state_dir"/gpg_sign_opt)"
 130         test -f "$state_dir"/signoff && {
 131                 signoff="$(cat "$state_dir"/signoff)"
 132                 force_rebase=t
 133         }
 134         test -f "$state_dir"/reschedule-failed-exec &&
 135                 reschedule_failed_exec=t
 136 }
 137
 138 finish_rebase () {
 139         rm -f "$(git rev-parse --git-path REBASE_HEAD)"
 140         apply_autostash &&
 141         { git gc --auto || true; } &&
 142         rm -rf "$state_dir"
 143 }
 144
 145 run_interactive () {
 146         GIT_CHERRY_PICK_HELP="$resolvemsg"
 147         export GIT_CHERRY_PICK_HELP
 148
 149         test -n "$keep_empty" && keep_empty="--keep-empty"
 150         test -n "$rebase_merges" && rebase_merges="--rebase-merges"
 151         test -n "$rebase_cousins" && rebase_cousins="--rebase-cousins"
 152         test -n "$autosquash" && autosquash="--autosquash"
 153         test -n "$verbose" && verbose="--verbose"
 154         test -n "$force_rebase" && force_rebase="--no-ff"
 155         test -n "$restrict_revision" && \
 156                 restrict_revision="--restrict-revision=^$restrict_revision"
 157         test -n "$upstream" && upstream="--upstream=$upstream"
 158         test -n "$onto" && onto="--onto=$onto"
 159         test -n "$squash_onto" && squash_onto="--squash-onto=$squash_onto"
 160         test -n "$onto_name" && onto_name="--onto-name=$onto_name"
 161         test -n "$head_name" && head_name="--head-name=$head_name"
 162         test -n "$strategy" && strategy="--strategy=$strategy"
 163         test -n "$strategy_opts" && strategy_opts="--strategy-opts=$strategy_opts"
 164         test -n "$switch_to" && switch_to="--switch-to=$switch_to"
 165         test -n "$cmd" && cmd="--cmd=$cmd"
 166         test -n "$action" && action="--$action"
 167
 168         exec git rebase--interactive "$action" "$keep_empty" "$rebase_merges" "$rebase_cousins" \
 169                 "$upstream" "$onto" "$squash_onto" "$restrict_revision" \
 170                 "$allow_empty_message" "$autosquash" "$verbose" \
 171                 "$force_rebase" "$onto_name" "$head_name" "$strategy" \
 172                 "$strategy_opts" "$cmd" "$switch_to" \
 173                 "$allow_rerere_autoupdate" "$gpg_sign_opt" "$signoff" \
 174                 "$reschedule_failed_exec"
 175 }
 176
 177 run_specific_rebase () {
 178         if [ "$interactive_rebase" = implied ]; then
 179                 GIT_SEQUENCE_EDITOR=:
 180                 export GIT_SEQUENCE_EDITOR
 181                 autosquash=
 182         fi
 183
 184         if test -n "$interactive_rebase" -a -z "$preserve_merges"
 185         then
 186                 run_interactive
 187         else
 188                 . git-rebase--$type
 189
 190                 if test -z "$preserve_merges"
 191                 then
 192                         git_rebase__$type
 193                 else
 194                         git_rebase__preserve_merges
 195                 fi
 196         fi
 197
 198         ret=$?
 199         if test $ret -eq 0
 200         then
 201                 finish_rebase
 202         elif test $ret -eq 2 # special exit status for rebase -p
 203         then
 204                 apply_autostash &&
 205                 rm -rf "$state_dir" &&
 206                 die "Nothing to do"
 207         fi
 208         exit $ret
 209 }
 210
 211 run_pre_rebase_hook () {
 212         if test -z "$ok_to_skip_pre_rebase" &&
 213            test -x "$(git rev-parse --git-path hooks/pre-rebase)"
 214         then
 215                 "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
 216                 die "$(gettext "The pre-rebase hook refused to rebase.")"
 217         fi
 218 }
 219
 220 test -f "$apply_dir"/applying &&
 221         die "$(gettext "It looks like 'git am' is in progress. Cannot rebase.")"
 222
 223 if test -d "$apply_dir"
 224 then
 225         type=am
 226         state_dir="$apply_dir"
 227 elif test -d "$merge_dir"
 228 then
 229         type=interactive
 230         if test -d "$merge_dir"/rewritten
 231         then
 232                 type=preserve-merges
 233                 interactive_rebase=explicit
 234                 preserve_merges=t
 235         elif test -f "$merge_dir"/interactive
 236         then
 237                 interactive_rebase=explicit
 238         fi
 239         state_dir="$merge_dir"
 240 fi
 241 test -n "$type" && in_progress=t
 242
 243 total_argc=$#
 244 while test $# != 0
 245 do
 246         case "$1" in
 247         --no-verify)
 248                 ok_to_skip_pre_rebase=yes
 249                 ;;
 250         --verify)
 251                 ok_to_skip_pre_rebase=
 252                 ;;
 253         --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
 254                 test $total_argc -eq 2 || usage
 255                 action=${1##--}
 256                 ;;
 257         --onto=*)
 258                 onto="${1#--onto=}"
 259                 ;;
 260         --exec=*)
 261                 cmd="${cmd}exec ${1#--exec=}${LF}"
 262                 test -z "$interactive_rebase" && interactive_rebase=implied
 263                 ;;
 264         -y*)
 265                 reschedule_failed_exec=--reschedule-failed-exec
 266                 cmd="${cmd}exec ${1#-y}${LF}"
 267                 test -z "$interactive_rebase" && interactive_rebase=implied
 268                 ;;
 269         --interactive)
 270                 interactive_rebase=explicit
 271                 ;;
 272         --keep-empty)
 273                 keep_empty=yes
 274                 ;;
 275         --allow-empty-message)
 276                 allow_empty_message=--allow-empty-message
 277                 ;;
 278         --no-keep-empty)
 279                 keep_empty=
 280                 ;;
 281         --rebase-merges)
 282                 rebase_merges=t
 283                 test -z "$interactive_rebase" && interactive_rebase=implied
 284                 ;;
 285         --rebase-merges=*)
 286                 rebase_merges=t
 287                 case "${1#*=}" in
 288                 rebase-cousins) rebase_cousins=t;;
 289                 no-rebase-cousins) rebase_cousins=;;
 290                 *) die "Unknown mode: $1";;
 291                 esac
 292                 test -z "$interactive_rebase" && interactive_rebase=implied
 293                 ;;
 294         --preserve-merges)
 295                 preserve_merges=t
 296                 test -z "$interactive_rebase" && interactive_rebase=implied
 297                 ;;
 298         --autosquash)
 299                 autosquash=t
 300                 ;;
 301         --no-autosquash)
 302                 autosquash=
 303                 ;;
 304         --fork-point)
 305                 fork_point=t
 306                 ;;
 307         --no-fork-point)
 308                 fork_point=
 309                 ;;
 310         --merge)
 311                 do_merge=t
 312                 ;;
 313         --strategy-option=*)
 314                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}" | sed -e s/^.//)"
 315                 do_merge=t
 316                 test -z "$strategy" && strategy=recursive
 317                 ;;
 318         --strategy=*)
 319                 strategy="${1#--strategy=}"
 320                 do_merge=t
 321                 ;;
 322         --no-stat)
 323                 diffstat=
 324                 ;;
 325         --stat)
 326                 diffstat=t
 327                 ;;
 328         --autostash)
 329                 autostash=true
 330                 ;;
 331         --no-autostash)
 332                 autostash=false
 333                 ;;
 334         --verbose)
 335                 verbose=t
 336                 diffstat=t
 337                 GIT_QUIET=
 338                 ;;
 339         --quiet)
 340                 GIT_QUIET=t
 341                 git_am_opt="$git_am_opt -q"
 342                 verbose=
 343                 diffstat=
 344                 ;;
 345         --whitespace=*)
 346                 git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
 347                 case "${1#--whitespace=}" in
 348                 fix|strip)
 349                         force_rebase=t
 350                         ;;
 351                 warn|nowarn|error|error-all)
 352                         ;; # okay, known whitespace option
 353                 *)
 354                         die "fatal: Invalid whitespace option: '${1#*=}'"
 355                         ;;
 356                 esac
 357                 ;;
 358         --ignore-whitespace)
 359                 git_am_opt="$git_am_opt $1"
 360                 ;;
 361         --signoff)
 362                 signoff=--signoff
 363                 ;;
 364         --no-signoff)
 365                 signoff=
 366                 ;;
 367         --committer-date-is-author-date|--ignore-date)
 368                 git_am_opt="$git_am_opt $1"
 369                 force_rebase=t
 370                 ;;
 371         -C*[!0-9]*)
 372                 die "fatal: switch \`C' expects a numerical value"
 373                 ;;
 374         -C*)
 375                 git_am_opt="$git_am_opt $1"
 376                 ;;
 377         --root)
 378                 rebase_root=t
 379                 ;;
 380         --force-rebase|--no-ff)
 381                 force_rebase=t
 382                 ;;
 383         --rerere-autoupdate|--no-rerere-autoupdate)
 384                 allow_rerere_autoupdate="$1"
 385                 ;;
 386         --gpg-sign)
 387                 gpg_sign_opt=-S
 388                 ;;
 389         --gpg-sign=*)
 390                 gpg_sign_opt="-S${1#--gpg-sign=}"
 391                 ;;
 392         --reschedule-failed-exec)
 393                 reschedule_failed_exec=--reschedule-failed-exec
 394                 ;;
 395         --no-reschedule-failed-exec)
 396                 reschedule_failed_exec=
 397                 ;;
 398         --)
 399                 shift
 400                 break
 401                 ;;
 402         *)
 403                 usage
 404                 ;;
 405         esac
 406         shift
 407 done
 408 test $# -gt 2 && usage
 409
 410 if test -n "$action"
 411 then
 412         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 413         # Only interactive rebase uses detailed reflog messages
 414         if test -n "$interactive_rebase" && test "$GIT_REFLOG_ACTION" = rebase
 415         then
 416                 GIT_REFLOG_ACTION="rebase -i ($action)"
 417                 export GIT_REFLOG_ACTION
 418         fi
 419 fi
 420
 421 if test "$action" = "edit-todo" && test -z "$interactive_rebase"
 422 then
 423         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 424 fi
 425
 426 case "$action" in
 427 continue)
 428         # Sanity check
 429         git rev-parse --verify HEAD >/dev/null ||
 430                 die "$(gettext "Cannot read HEAD")"
 431         git update-index --ignore-submodules --refresh &&
 432         git diff-files --quiet --ignore-submodules || {
 433                 echo "$(gettext "You must edit all merge conflicts and then
 434 mark them as resolved using git add")"
 435                 exit 1
 436         }
 437         read_basic_state
 438         run_specific_rebase
 439         ;;
 440 skip)
 441         output git reset --hard HEAD || exit $?
 442         read_basic_state
 443         run_specific_rebase
 444         ;;
 445 abort)
 446         git rerere clear
 447         read_basic_state
 448         case "$head_name" in
 449         refs/*)
 450                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 451                 die "$(eval_gettext "Could not move back to \$head_name")"
 452                 ;;
 453         esac
 454         output git reset --hard $orig_head
 455         finish_rebase
 456         exit
 457         ;;
 458 quit)
 459         exec rm -rf "$state_dir"
 460         ;;
 461 edit-todo)
 462         run_specific_rebase
 463         ;;
 464 show-current-patch)
 465         run_specific_rebase
 466         die "BUG: run_specific_rebase is not supposed to return here"
 467         ;;
 468 esac
 469
 470 # Make sure no rebase is in progress
 471 if test -n "$in_progress"
 472 then
 473         state_dir_base=${state_dir##*/}
 474         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 475         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 476         die "
 477 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 478 I wonder if you are in the middle of another rebase.  If that is the
 479 case, please try
 480         $cmd_live_rebase
 481 If that is not the case, please
 482         $cmd_clear_stale_rebase
 483 and run me again.  I am stopping in case you still have something
 484 valuable there.')"
 485 fi
 486
 487 if test -n "$rebase_root" && test -z "$onto"
 488 then
 489         test -z "$interactive_rebase" && interactive_rebase=implied
 490 fi
 491
 492 if test -n "$keep_empty"
 493 then
 494         test -z "$interactive_rebase" && interactive_rebase=implied
 495 fi
 496
 497 actually_interactive=
 498 if test -n "$interactive_rebase"
 499 then
 500         if test -z "$preserve_merges"
 501         then
 502                 type=interactive
 503         else
 504                 type=preserve-merges
 505         fi
 506         actually_interactive=t
 507         state_dir="$merge_dir"
 508 elif test -n "$do_merge"
 509 then
 510         interactive_rebase=implied
 511         type=interactive
 512         state_dir="$merge_dir"
 513 else
 514         type=am
 515         state_dir="$apply_dir"
 516 fi
 517
 518 if test -t 2 && test -z "$GIT_QUIET"
 519 then
 520         git_format_patch_opt="$git_format_patch_opt --progress"
 521 fi
 522
 523 incompatible_opts=$(echo " $git_am_opt " | \
 524                     sed -e 's/ -q / /g' -e 's/^ \(.*\) $/\1/')
 525 if test -n "$incompatible_opts"
 526 then
 527         if test -n "$actually_interactive" || test "$do_merge"
 528         then
 529                 die "$(gettext "fatal: cannot combine am options with either interactive or merge options")"
 530         fi
 531 fi
 532
 533 if test -n "$signoff"
 534 then
 535         test -n "$preserve_merges" &&
 536                 die "$(gettext "fatal: cannot combine '--signoff' with '--preserve-merges'")"
 537         git_am_opt="$git_am_opt $signoff"
 538         force_rebase=t
 539 fi
 540
 541 if test -n "$preserve_merges"
 542 then
 543         # Note: incompatibility with --signoff handled in signoff block above
 544         # Note: incompatibility with --interactive is just a strong warning;
 545         #       git-rebase.txt caveats with "unless you know what you are doing"
 546         test -n "$rebase_merges" &&
 547                 die "$(gettext "fatal: cannot combine '--preserve-merges' with '--rebase-merges'")"
 548
 549         test -n "$reschedule_failed_exec" &&
 550                 die "$(gettext "error: cannot combine '--preserve-merges' with '--reschedule-failed-exec'")"
 551 fi
 552
 553 if test -n "$rebase_merges"
 554 then
 555         test -n "$strategy_opts" &&
 556                 die "$(gettext "fatal: cannot combine '--rebase-merges' with '--strategy-option'")"
 557         test -n "$strategy" &&
 558                 die "$(gettext "fatal: cannot combine '--rebase-merges' with '--strategy'")"
 559 fi
 560
 561 if test -z "$rebase_root"
 562 then
 563         case "$#" in
 564         0)
 565                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
 566                         --verify -q @{upstream} 2>/dev/null)
 567                 then
 568                         . git-parse-remote
 569                         error_on_missing_default_upstream "rebase" "rebase" \
 570                                 "against" "git rebase $(gettext '<branch>')"
 571                 fi
 572
 573                 test "$fork_point" = auto && fork_point=t
 574                 ;;
 575         *)      upstream_name="$1"
 576                 if test "$upstream_name" = "-"
 577                 then
 578                         upstream_name="@{-1}"
 579                 fi
 580                 shift
 581                 ;;
 582         esac
 583         upstream=$(peel_committish "${upstream_name}") ||
 584         die "$(eval_gettext "invalid upstream '\$upstream_name'")"
 585         upstream_arg="$upstream_name"
 586 else
 587         if test -z "$onto"
 588         then
 589                 empty_tree=$(git hash-object -t tree /dev/null)
 590                 onto=$(git commit-tree $empty_tree </dev/null)
 591                 squash_onto="$onto"
 592         fi
 593         unset upstream_name
 594         unset upstream
 595         test $# -gt 1 && usage
 596         upstream_arg=--root
 597 fi
 598
 599 # Make sure the branch to rebase onto is valid.
 600 onto_name=${onto-"$upstream_name"}
 601 case "$onto_name" in
 602 *...*)
 603         if      left=${onto_name%...*} right=${onto_name#*...} &&
 604                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 605         then
 606                 case "$onto" in
 607                 ?*"$LF"?*)
 608                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 609                         ;;
 610                 '')
 611                         die "$(eval_gettext "\$onto_name: there is no merge base")"
 612                         ;;
 613                 esac
 614         else
 615                 die "$(eval_gettext "\$onto_name: there is no merge base")"
 616         fi
 617         ;;
 618 *)
 619         onto=$(peel_committish "$onto_name") ||
 620         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 621         ;;
 622 esac
 623
 624 # If the branch to rebase is given, that is the branch we will rebase
 625 # $branch_name -- branch/commit being rebased, or HEAD (already detached)
 626 # $orig_head -- commit object name of tip of the branch before rebasing
 627 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 628 switch_to=
 629 case "$#" in
 630 1)
 631         # Is it "rebase other $branchname" or "rebase other $commit"?
 632         branch_name="$1"
 633         switch_to="$1"
 634
 635         # Is it a local branch?
 636         if git show-ref --verify --quiet -- "refs/heads/$branch_name" &&
 637            orig_head=$(git rev-parse -q --verify "refs/heads/$branch_name")
 638         then
 639                 head_name="refs/heads/$branch_name"
 640         # If not is it a valid ref (branch or commit)?
 641         elif orig_head=$(git rev-parse -q --verify "$branch_name")
 642         then
 643                 head_name="detached HEAD"
 644
 645         else
 646                 die "$(eval_gettext "fatal: no such branch/commit '\$branch_name'")"
 647         fi
 648         ;;
 649 0)
 650         # Do not need to switch branches, we are already on it.
 651         if branch_name=$(git symbolic-ref -q HEAD)
 652         then
 653                 head_name=$branch_name
 654                 branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
 655         else
 656                 head_name="detached HEAD"
 657                 branch_name=HEAD
 658         fi
 659         orig_head=$(git rev-parse --verify HEAD) || exit
 660         ;;
 661 *)
 662         die "BUG: unexpected number of arguments left to parse"
 663         ;;
 664 esac
 665
 666 if test "$fork_point" = t
 667 then
 668         new_upstream=$(git merge-base --fork-point "$upstream_name" \
 669                         "${switch_to:-HEAD}")
 670         if test -n "$new_upstream"
 671         then
 672                 restrict_revision=$new_upstream
 673         fi
 674 fi
 675
 676 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 677 then
 678         stash_sha1=$(git stash create "autostash") ||
 679         die "$(gettext 'Cannot autostash')"
 680
 681         mkdir -p "$state_dir" &&
 682         echo $stash_sha1 >"$state_dir/autostash" &&
 683         stash_abbrev=$(git rev-parse --short $stash_sha1) &&
 684         echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
 685         git reset --hard
 686 fi
 687
 688 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 689
 690 # Now we are rebasing commits $upstream..$orig_head (or with --root,
 691 # everything leading up to $orig_head) on top of $onto
 692
 693 # Check if we are already based on $onto with linear history,
 694 # but this should be done only when upstream and onto are the same
 695 # and if this is not an interactive rebase.
 696 mb=$(git merge-base "$onto" "$orig_head")
 697 if test -z "$actually_interactive" && test "$upstream" = "$onto" &&
 698         test "$mb" = "$onto" && test -z "$restrict_revision" &&
 699         # linear history?
 700         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 701 then
 702         if test -z "$force_rebase"
 703         then
 704                 # Lazily switch to the target branch if needed...
 705                 test -z "$switch_to" ||
 706                 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
 707                         git checkout -q "$switch_to" --
 708                 if test "$branch_name" = "HEAD" &&
 709                          ! git symbolic-ref -q HEAD
 710                 then
 711                         say "$(eval_gettext "HEAD is up to date.")"
 712                 else
 713                         say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 714                 fi
 715                 finish_rebase
 716                 exit 0
 717         else
 718                 if test "$branch_name" = "HEAD" &&
 719                          ! git symbolic-ref -q HEAD
 720                 then
 721                         say "$(eval_gettext "HEAD is up to date, rebase forced.")"
 722                 else
 723                         say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 724                 fi
 725         fi
 726 fi
 727
 728 # If a hook exists, give it a chance to interrupt
 729 run_pre_rebase_hook "$upstream_arg" "$@"
 730
 731 if test -n "$diffstat"
 732 then
 733         if test -n "$verbose"
 734         then
 735                 if test -z "$mb"
 736                 then
 737                         echo "$(eval_gettext "Changes to \$onto:")"
 738                 else
 739                         echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 740                 fi
 741         fi
 742         mb_tree="${mb:-$(git hash-object -t tree /dev/null)}"
 743         # We want color (if set), but no pager
 744         GIT_PAGER='' git diff --stat --summary "$mb_tree" "$onto"
 745 fi
 746
 747 if test -z "$actually_interactive" && test "$mb" = "$orig_head"
 748 then
 749         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 750         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 751                 git checkout -q "$onto^0" || die "could not detach HEAD"
 752         # If the $onto is a proper descendant of the tip of the branch, then
 753         # we just fast-forwarded.
 754         git update-ref ORIG_HEAD $orig_head
 755         move_to_original_branch
 756         finish_rebase
 757         exit 0
 758 fi
 759
 760 test -n "$interactive_rebase" && run_specific_rebase
 761
 762 # Detach HEAD and reset the tree
 763 say "$(gettext "First, rewinding head to replay your work on top of it...")"
 764
 765 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 766         git checkout -q "$onto^0" || die "could not detach HEAD"
 767 git update-ref ORIG_HEAD $orig_head
 768
 769 if test -n "$rebase_root"
 770 then
 771         revisions="$onto..$orig_head"
 772 else
 773         revisions="${restrict_revision-$upstream}..$orig_head"
 774 fi
 775
 776 run_specific_rebase