Andrew's git / gitweb.git / git-legacy-rebase.sh
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git-legacy-rebase.shon commit various: tighten constness of some local variables (33de80b)
   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Junio C Hamano.
   4#
   5
   6SUBDIRECTORY_OK=Yes
   7OPTIONS_KEEPDASHDASH=
   8OPTIONS_STUCKLONG=t
   9OPTIONS_SPEC="\
  10git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] [<upstream>] [<branch>]
  11git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] --root [<branch>]
  12git rebase --continue | --abort | --skip | --edit-todo
  13--
  14 Available options are
  15v,verbose!         display a diffstat of what changed upstream
  16q,quiet!           be quiet. implies --no-stat
  17autostash          automatically stash/stash pop before and after
  18fork-point         use 'merge-base --fork-point' to refine upstream
  19onto=!             rebase onto given branch instead of upstream
  20r,rebase-merges?   try to rebase merges instead of skipping them
  21p,preserve-merges! try to recreate merges instead of ignoring them
  22s,strategy=!       use the given merge strategy
  23X,strategy-option=! pass the argument through to the merge strategy
  24no-ff!             cherry-pick all commits, even if unchanged
  25f,force-rebase!    cherry-pick all commits, even if unchanged
  26m,merge!           use merging strategies to rebase
  27i,interactive!     let the user edit the list of commits to rebase
  28x,exec=!           add exec lines after each commit of the editable list
  29y=!                same as --reschedule-failed-exec -x
  30k,keep-empty       preserve empty commits during rebase
  31allow-empty-message allow rebasing commits with empty messages
  32stat!              display a diffstat of what changed upstream
  33n,no-stat!         do not show diffstat of what changed upstream
  34verify             allow pre-rebase hook to run
  35rerere-autoupdate  allow rerere to update index with resolved conflicts
  36root!              rebase all reachable commits up to the root(s)
  37autosquash         move commits that begin with squash!/fixup! under -i
  38signoff            add a Signed-off-by: line to each commit
  39committer-date-is-author-date! passed to 'git am'
  40ignore-date!       passed to 'git am'
  41whitespace=!       passed to 'git apply'
  42ignore-whitespace! passed to 'git apply'
  43C=!                passed to 'git apply'
  44S,gpg-sign?        GPG-sign commits
  45 Actions:
  46continue!          continue
  47abort!             abort and check out the original branch
  48skip!              skip current patch and continue
  49edit-todo!         edit the todo list during an interactive rebase
  50quit!              abort but keep HEAD where it is
  51show-current-patch! show the patch file being applied or merged
  52reschedule-failed-exec automatically reschedule failed exec commands
  53"
  54. git-sh-setup
  55set_reflog_action rebase
  56require_work_tree_exists
  57cd_to_toplevel
  58
  59LF='
  60'
  61ok_to_skip_pre_rebase=
  62
  63squash_onto=
  64unset onto
  65unset restrict_revision
  66cmd=
  67strategy=
  68strategy_opts=
  69do_merge=
  70merge_dir="$GIT_DIR"/rebase-merge
  71apply_dir="$GIT_DIR"/rebase-apply
  72verbose=
  73diffstat=
  74test "$(git config --bool rebase.stat)" = true && diffstat=t
  75autostash="$(git config --bool rebase.autostash || echo false)"
  76fork_point=auto
  77git_am_opt=
  78git_format_patch_opt=
  79rebase_root=
  80force_rebase=
  81allow_rerere_autoupdate=
  82# Non-empty if a rebase was in progress when 'git rebase' was invoked
  83in_progress=
  84# One of {am, merge, interactive}
  85type=
  86# One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  87state_dir=
  88# One of {'', continue, skip, abort}, as parsed from command line
  89action=
  90rebase_merges=
  91rebase_cousins=
  92preserve_merges=
  93autosquash=
  94keep_empty=
  95allow_empty_message=--allow-empty-message
  96signoff=
  97reschedule_failed_exec=
  98test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  99case "$(git config --bool commit.gpgsign)" in
 100true)   gpg_sign_opt=-S ;;
 101*)      gpg_sign_opt= ;;
 102esac
 103test "$(git config --bool rebase.reschedulefailedexec)" = "true" &&
 104reschedule_failed_exec=--reschedule-failed-exec
 105. git-rebase--common
 106
 107read_basic_state () {
 108        test -f "$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        GIT_QUIET=$(cat "$state_dir"/quiet) &&
 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 "$state_dir"/reschedule-failed-exec &&
 135                reschedule_failed_exec=t
 136}
 137
 138finish_rebase () {
 139        rm -f "$(git rev-parse --git-path REBASE_HEAD)"
 140        apply_autostash &&
 141        { git gc --auto || true; } &&
 142        rm -rf "$state_dir"
 143}
 144
 145run_interactive () {
 146        GIT_CHERRY_PICK_HELP="$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
 177run_specific_rebase () {
 178        if [ "$interactive_rebase" = implied ]; then
 179                GIT_EDITOR=:
 180                export GIT_EDITOR
 181                autosquash=
 182        fi
 183
 184        if test -n "$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 $ret
 209}
 210
 211run_pre_rebase_hook () {
 212        if test -z "$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 "$(gettext "The pre-rebase hook refused to rebase.")"
 217        fi
 218}
 219
 220test -f "$apply_dir"/applying &&
 221        die "$(gettext "It looks like 'git am' is in progress. Cannot rebase.")"
 222
 223if test -d "$apply_dir"
 224then
 225        type=am
 226        state_dir="$apply_dir"
 227elif test -d "$merge_dir"
 228then
 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                type=interactive
 237                interactive_rebase=explicit
 238        else
 239                type=merge
 240        fi
 241        state_dir="$merge_dir"
 242fi
 243test -n "$type" && in_progress=t
 244
 245total_argc=$#
 246while test $# != 0
 247do
 248        case "$1" in
 249        --no-verify)
 250                ok_to_skip_pre_rebase=yes
 251                ;;
 252        --verify)
 253                ok_to_skip_pre_rebase=
 254                ;;
 255        --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
 256                test $total_argc -eq 2 || usage
 257                action=${1##--}
 258                ;;
 259        --onto=*)
 260                onto="${1#--onto=}"
 261                ;;
 262        --exec=*)
 263                cmd="${cmd}exec ${1#--exec=}${LF}"
 264                test -z "$interactive_rebase" && interactive_rebase=implied
 265                ;;
 266        -y*)
 267                reschedule_failed_exec=--reschedule-failed-exec
 268                cmd="${cmd}exec ${1#-y}${LF}"
 269                test -z "$interactive_rebase" && interactive_rebase=implied
 270                ;;
 271        --interactive)
 272                interactive_rebase=explicit
 273                ;;
 274        --keep-empty)
 275                keep_empty=yes
 276                ;;
 277        --allow-empty-message)
 278                allow_empty_message=--allow-empty-message
 279                ;;
 280        --no-keep-empty)
 281                keep_empty=
 282                ;;
 283        --rebase-merges)
 284                rebase_merges=t
 285                test -z "$interactive_rebase" && interactive_rebase=implied
 286                ;;
 287        --rebase-merges=*)
 288                rebase_merges=t
 289                case "${1#*=}" in
 290                rebase-cousins) rebase_cousins=t;;
 291                no-rebase-cousins) rebase_cousins=;;
 292                *) die "Unknown mode: $1";;
 293                esac
 294                test -z "$interactive_rebase" && interactive_rebase=implied
 295                ;;
 296        --preserve-merges)
 297                preserve_merges=t
 298                test -z "$interactive_rebase" && interactive_rebase=implied
 299                ;;
 300        --autosquash)
 301                autosquash=t
 302                ;;
 303        --no-autosquash)
 304                autosquash=
 305                ;;
 306        --fork-point)
 307                fork_point=t
 308                ;;
 309        --no-fork-point)
 310                fork_point=
 311                ;;
 312        --merge)
 313                do_merge=t
 314                ;;
 315        --strategy-option=*)
 316                strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}" | sed -e s/^.//)"
 317                do_merge=t
 318                test -z "$strategy" && strategy=recursive
 319                ;;
 320        --strategy=*)
 321                strategy="${1#--strategy=}"
 322                do_merge=t
 323                ;;
 324        --no-stat)
 325                diffstat=
 326                ;;
 327        --stat)
 328                diffstat=t
 329                ;;
 330        --autostash)
 331                autostash=true
 332                ;;
 333        --no-autostash)
 334                autostash=false
 335                ;;
 336        --verbose)
 337                verbose=t
 338                diffstat=t
 339                GIT_QUIET=
 340                ;;
 341        --quiet)
 342                GIT_QUIET=t
 343                git_am_opt="$git_am_opt -q"
 344                verbose=
 345                diffstat=
 346                ;;
 347        --whitespace=*)
 348                git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
 349                case "${1#--whitespace=}" in
 350                fix|strip)
 351                        force_rebase=t
 352                        ;;
 353                warn|nowarn|error|error-all)
 354                        ;; # okay, known whitespace option
 355                *)
 356                        die "fatal: Invalid whitespace option: '${1#*=}'"
 357                        ;;
 358                esac
 359                ;;
 360        --ignore-whitespace)
 361                git_am_opt="$git_am_opt $1"
 362                ;;
 363        --signoff)
 364                signoff=--signoff
 365                ;;
 366        --no-signoff)
 367                signoff=
 368                ;;
 369        --committer-date-is-author-date|--ignore-date)
 370                git_am_opt="$git_am_opt $1"
 371                force_rebase=t
 372                ;;
 373        -C*[!0-9]*)
 374                die "fatal: switch \`C' expects a numerical value"
 375                ;;
 376        -C*)
 377                git_am_opt="$git_am_opt $1"
 378                ;;
 379        --root)
 380                rebase_root=t
 381                ;;
 382        --force-rebase|--no-ff)
 383                force_rebase=t
 384                ;;
 385        --rerere-autoupdate|--no-rerere-autoupdate)
 386                allow_rerere_autoupdate="$1"
 387                ;;
 388        --gpg-sign)
 389                gpg_sign_opt=-S
 390                ;;
 391        --gpg-sign=*)
 392                gpg_sign_opt="-S${1#--gpg-sign=}"
 393                ;;
 394        --reschedule-failed-exec)
 395                reschedule_failed_exec=--reschedule-failed-exec
 396                ;;
 397        --no-reschedule-failed-exec)
 398                reschedule_failed_exec=
 399                ;;
 400        --)
 401                shift
 402                break
 403                ;;
 404        *)
 405                usage
 406                ;;
 407        esac
 408        shift
 409done
 410test $# -gt 2 && usage
 411
 412if test -n "$action"
 413then
 414        test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 415        # Only interactive rebase uses detailed reflog messages
 416        if test -n "$interactive_rebase" && test "$GIT_REFLOG_ACTION" = rebase
 417        then
 418                GIT_REFLOG_ACTION="rebase -i ($action)"
 419                export GIT_REFLOG_ACTION
 420        fi
 421fi
 422
 423if test "$action" = "edit-todo" && test -z "$interactive_rebase"
 424then
 425        die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 426fi
 427
 428case "$action" in
 429continue)
 430        # Sanity check
 431        git rev-parse --verify HEAD >/dev/null ||
 432                die "$(gettext "Cannot read HEAD")"
 433        git update-index --ignore-submodules --refresh &&
 434        git diff-files --quiet --ignore-submodules || {
 435                echo "$(gettext "You must edit all merge conflicts and then
 436mark them as resolved using git add")"
 437                exit 1
 438        }
 439        read_basic_state
 440        run_specific_rebase
 441        ;;
 442skip)
 443        output git reset --hard HEAD || exit $?
 444        read_basic_state
 445        run_specific_rebase
 446        ;;
 447abort)
 448        git rerere clear
 449        read_basic_state
 450        case "$head_name" in
 451        refs/*)
 452                git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 453                die "$(eval_gettext "Could not move back to \$head_name")"
 454                ;;
 455        esac
 456        output git reset --hard $orig_head
 457        finish_rebase
 458        exit
 459        ;;
 460quit)
 461        exec rm -rf "$state_dir"
 462        ;;
 463edit-todo)
 464        run_specific_rebase
 465        ;;
 466show-current-patch)
 467        run_specific_rebase
 468        die "BUG: run_specific_rebase is not supposed to return here"
 469        ;;
 470esac
 471
 472# Make sure no rebase is in progress
 473if test -n "$in_progress"
 474then
 475        state_dir_base=${state_dir##*/}
 476        cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 477        cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 478        die "
 479$(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 480I wonder if you are in the middle of another rebase.  If that is the
 481case, please try
 482        $cmd_live_rebase
 483If that is not the case, please
 484        $cmd_clear_stale_rebase
 485and run me again.  I am stopping in case you still have something
 486valuable there.')"
 487fi
 488
 489if test -n "$rebase_root" && test -z "$onto"
 490then
 491        test -z "$interactive_rebase" && interactive_rebase=implied
 492fi
 493
 494if test -n "$keep_empty"
 495then
 496        test -z "$interactive_rebase" && interactive_rebase=implied
 497fi
 498
 499if test -n "$interactive_rebase"
 500then
 501        if test -z "$preserve_merges"
 502        then
 503                type=interactive
 504        else
 505                type=preserve-merges
 506        fi
 507
 508        state_dir="$merge_dir"
 509elif test -n "$do_merge"
 510then
 511        type=merge
 512        state_dir="$merge_dir"
 513else
 514        type=am
 515        state_dir="$apply_dir"
 516fi
 517
 518if test -t 2 && test -z "$GIT_QUIET"
 519then
 520        git_format_patch_opt="$git_format_patch_opt --progress"
 521fi
 522
 523if test -n "$git_am_opt"; then
 524        incompatible_opts=$(echo " $git_am_opt " | \
 525                            sed -e 's/ -q / /g' -e 's/^ \(.*\) $/\1/')
 526        if test -n "$interactive_rebase"
 527        then
 528                if test -n "$incompatible_opts"
 529                then
 530                        die "$(gettext "error: cannot combine interactive options (--interactive, --exec, --rebase-merges, --preserve-merges, --keep-empty, --root + --onto) with am options ($incompatible_opts)")"
 531                fi
 532        fi
 533        if test -n "$do_merge"; then
 534                if test -n "$incompatible_opts"
 535                then
 536                        die "$(gettext "error: cannot combine merge options (--merge, --strategy, --strategy-option) with am options ($incompatible_opts)")"
 537                fi
 538        fi
 539fi
 540
 541if test -n "$signoff"
 542then
 543        test -n "$preserve_merges" &&
 544                die "$(gettext "error: cannot combine '--signoff' with '--preserve-merges'")"
 545        git_am_opt="$git_am_opt $signoff"
 546        force_rebase=t
 547fi
 548
 549if test -n "$preserve_merges"
 550then
 551        # Note: incompatibility with --signoff handled in signoff block above
 552        # Note: incompatibility with --interactive is just a strong warning;
 553        #       git-rebase.txt caveats with "unless you know what you are doing"
 554        test -n "$rebase_merges" &&
 555                die "$(gettext "error: cannot combine '--preserve-merges' with '--rebase-merges'")"
 556
 557        test -n "$reschedule_failed_exec" &&
 558                die "$(gettext "error: cannot combine '--preserve-merges' with '--reschedule-failed-exec'")"
 559fi
 560
 561if test -n "$rebase_merges"
 562then
 563        test -n "$strategy_opts" &&
 564                die "$(gettext "error: cannot combine '--rebase-merges' with '--strategy-option'")"
 565        test -n "$strategy" &&
 566                die "$(gettext "error: cannot combine '--rebase-merges' with '--strategy'")"
 567fi
 568
 569if test -z "$rebase_root"
 570then
 571        case "$#" in
 572        0)
 573                if ! upstream_name=$(git rev-parse --symbolic-full-name \
 574                        --verify -q @{upstream} 2>/dev/null)
 575                then
 576                        . git-parse-remote
 577                        error_on_missing_default_upstream "rebase" "rebase" \
 578                                "against" "git rebase $(gettext '<branch>')"
 579                fi
 580
 581                test "$fork_point" = auto && fork_point=t
 582                ;;
 583        *)      upstream_name="$1"
 584                if test "$upstream_name" = "-"
 585                then
 586                        upstream_name="@{-1}"
 587                fi
 588                shift
 589                ;;
 590        esac
 591        upstream=$(peel_committish "${upstream_name}") ||
 592        die "$(eval_gettext "invalid upstream '\$upstream_name'")"
 593        upstream_arg="$upstream_name"
 594else
 595        if test -z "$onto"
 596        then
 597                empty_tree=$(git hash-object -t tree /dev/null)
 598                onto=$(git commit-tree $empty_tree </dev/null)
 599                squash_onto="$onto"
 600        fi
 601        unset upstream_name
 602        unset upstream
 603        test $# -gt 1 && usage
 604        upstream_arg=--root
 605fi
 606
 607# Make sure the branch to rebase onto is valid.
 608onto_name=${onto-"$upstream_name"}
 609case "$onto_name" in
 610*...*)
 611        if      left=${onto_name%...*} right=${onto_name#*...} &&
 612                onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 613        then
 614                case "$onto" in
 615                ?*"$LF"?*)
 616                        die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 617                        ;;
 618                '')
 619                        die "$(eval_gettext "\$onto_name: there is no merge base")"
 620                        ;;
 621                esac
 622        else
 623                die "$(eval_gettext "\$onto_name: there is no merge base")"
 624        fi
 625        ;;
 626*)
 627        onto=$(peel_committish "$onto_name") ||
 628        die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 629        ;;
 630esac
 631
 632# If the branch to rebase is given, that is the branch we will rebase
 633# $branch_name -- branch/commit being rebased, or HEAD (already detached)
 634# $orig_head -- commit object name of tip of the branch before rebasing
 635# $head_name -- refs/heads/<that-branch> or "detached HEAD"
 636switch_to=
 637case "$#" in
 6381)
 639        # Is it "rebase other $branchname" or "rebase other $commit"?
 640        branch_name="$1"
 641        switch_to="$1"
 642
 643        # Is it a local branch?
 644        if git show-ref --verify --quiet -- "refs/heads/$branch_name" &&
 645           orig_head=$(git rev-parse -q --verify "refs/heads/$branch_name")
 646        then
 647                head_name="refs/heads/$branch_name"
 648        # If not is it a valid ref (branch or commit)?
 649        elif orig_head=$(git rev-parse -q --verify "$branch_name")
 650        then
 651                head_name="detached HEAD"
 652
 653        else
 654                die "$(eval_gettext "fatal: no such branch/commit '\$branch_name'")"
 655        fi
 656        ;;
 6570)
 658        # Do not need to switch branches, we are already on it.
 659        if branch_name=$(git symbolic-ref -q HEAD)
 660        then
 661                head_name=$branch_name
 662                branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
 663        else
 664                head_name="detached HEAD"
 665                branch_name=HEAD
 666        fi
 667        orig_head=$(git rev-parse --verify HEAD) || exit
 668        ;;
 669*)
 670        die "BUG: unexpected number of arguments left to parse"
 671        ;;
 672esac
 673
 674if test "$fork_point" = t
 675then
 676        new_upstream=$(git merge-base --fork-point "$upstream_name" \
 677                        "${switch_to:-HEAD}")
 678        if test -n "$new_upstream"
 679        then
 680                restrict_revision=$new_upstream
 681        fi
 682fi
 683
 684if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 685then
 686        stash_sha1=$(git stash create "autostash") ||
 687        die "$(gettext 'Cannot autostash')"
 688
 689        mkdir -p "$state_dir" &&
 690        echo $stash_sha1 >"$state_dir/autostash" &&
 691        stash_abbrev=$(git rev-parse --short $stash_sha1) &&
 692        echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
 693        git reset --hard
 694fi
 695
 696require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 697
 698# Now we are rebasing commits $upstream..$orig_head (or with --root,
 699# everything leading up to $orig_head) on top of $onto
 700
 701# Check if we are already based on $onto with linear history,
 702# but this should be done only when upstream and onto are the same
 703# and if this is not an interactive rebase.
 704mb=$(git merge-base "$onto" "$orig_head")
 705if test -z "$interactive_rebase" && test "$upstream" = "$onto" &&
 706        test "$mb" = "$onto" && test -z "$restrict_revision" &&
 707        # linear history?
 708        ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 709then
 710        if test -z "$force_rebase"
 711        then
 712                # Lazily switch to the target branch if needed...
 713                test -z "$switch_to" ||
 714                GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
 715                        git checkout -q "$switch_to" --
 716                if test "$branch_name" = "HEAD" &&
 717                         ! git symbolic-ref -q HEAD
 718                then
 719                        say "$(eval_gettext "HEAD is up to date.")"
 720                else
 721                        say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 722                fi
 723                finish_rebase
 724                exit 0
 725        else
 726                if test "$branch_name" = "HEAD" &&
 727                         ! git symbolic-ref -q HEAD
 728                then
 729                        say "$(eval_gettext "HEAD is up to date, rebase forced.")"
 730                else
 731                        say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 732                fi
 733        fi
 734fi
 735
 736# If a hook exists, give it a chance to interrupt
 737run_pre_rebase_hook "$upstream_arg" "$@"
 738
 739if test -n "$diffstat"
 740then
 741        if test -n "$verbose"
 742        then
 743                if test -z "$mb"
 744                then
 745                        echo "$(eval_gettext "Changes to \$onto:")"
 746                else
 747                        echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 748                fi
 749        fi
 750        mb_tree="${mb:-$(git hash-object -t tree /dev/null)}"
 751        # We want color (if set), but no pager
 752        GIT_PAGER='' git diff --stat --summary "$mb_tree" "$onto"
 753fi
 754
 755test -n "$interactive_rebase" && run_specific_rebase
 756
 757# Detach HEAD and reset the tree
 758say "$(gettext "First, rewinding head to replay your work on top of it...")"
 759
 760GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 761        git checkout -q "$onto^0" || die "could not detach HEAD"
 762git update-ref ORIG_HEAD $orig_head
 763
 764# If the $onto is a proper descendant of the tip of the branch, then
 765# we just fast-forwarded.
 766if test "$mb" = "$orig_head"
 767then
 768        say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 769        move_to_original_branch
 770        finish_rebase
 771        exit 0
 772fi
 773
 774if test -n "$rebase_root"
 775then
 776        revisions="$onto..$orig_head"
 777else
 778        revisions="${restrict_revision-$upstream}..$orig_head"
 779fi
 780
 781run_specific_rebase