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