Andrew's git / gitweb.git / git-rebase.sh
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git-rebase.shon commit sha1_name: convert uses of 40 to GIT_SHA1_HEXSZ (ac53fe8)
   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
  20p,preserve-merges! try to recreate merges instead of ignoring them
  21s,strategy=!       use the given merge strategy
  22no-ff!             cherry-pick all commits, even if unchanged
  23m,merge!           use merging strategies to rebase
  24i,interactive!     let the user edit the list of commits to rebase
  25x,exec=!           add exec lines after each commit of the editable list
  26k,keep-empty       preserve empty commits during rebase
  27f,force-rebase!    force rebase even if branch is up to date
  28X,strategy-option=! pass the argument through to the merge strategy
  29stat!              display a diffstat of what changed upstream
  30n,no-stat!         do not show diffstat of what changed upstream
  31verify             allow pre-rebase hook to run
  32rerere-autoupdate  allow rerere to update index with resolved conflicts
  33root!              rebase all reachable commits up to the root(s)
  34autosquash         move commits that begin with squash!/fixup! under -i
  35committer-date-is-author-date! passed to 'git am'
  36ignore-date!       passed to 'git am'
  37signoff            passed to 'git am'
  38whitespace=!       passed to 'git apply'
  39ignore-whitespace! passed to 'git apply'
  40C=!                passed to 'git apply'
  41S,gpg-sign?        GPG-sign commits
  42 Actions:
  43continue!          continue
  44abort!             abort and check out the original branch
  45skip!              skip current patch and continue
  46edit-todo!         edit the todo list during an interactive rebase
  47quit!              abort but keep HEAD where it is
  48"
  49. git-sh-setup
  50set_reflog_action rebase
  51require_work_tree_exists
  52cd_to_toplevel
  53
  54LF='
  55'
  56ok_to_skip_pre_rebase=
  57resolvemsg="
  58$(gettext 'When you have resolved this problem, run "git rebase --continue".
  59If you prefer to skip this patch, run "git rebase --skip" instead.
  60To check out the original branch and stop rebasing, run "git rebase --abort".')
  61"
  62unset onto
  63unset restrict_revision
  64cmd=
  65strategy=
  66strategy_opts=
  67do_merge=
  68merge_dir="$GIT_DIR"/rebase-merge
  69apply_dir="$GIT_DIR"/rebase-apply
  70verbose=
  71diffstat=
  72test "$(git config --bool rebase.stat)" = true && diffstat=t
  73autostash="$(git config --bool rebase.autostash || echo false)"
  74fork_point=auto
  75git_am_opt=
  76rebase_root=
  77force_rebase=
  78allow_rerere_autoupdate=
  79# Non-empty if a rebase was in progress when 'git rebase' was invoked
  80in_progress=
  81# One of {am, merge, interactive}
  82type=
  83# One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  84state_dir=
  85# One of {'', continue, skip, abort}, as parsed from command line
  86action=
  87preserve_merges=
  88autosquash=
  89keep_empty=
  90test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  91case "$(git config --bool commit.gpgsign)" in
  92true)   gpg_sign_opt=-S ;;
  93*)      gpg_sign_opt= ;;
  94esac
  95
  96read_basic_state () {
  97        test -f "$state_dir/head-name" &&
  98        test -f "$state_dir/onto" &&
  99        head_name=$(cat "$state_dir"/head-name) &&
 100        onto=$(cat "$state_dir"/onto) &&
 101        # We always write to orig-head, but interactive rebase used to write to
 102        # head. Fall back to reading from head to cover for the case that the
 103        # user upgraded git with an ongoing interactive rebase.
 104        if test -f "$state_dir"/orig-head
 105        then
 106                orig_head=$(cat "$state_dir"/orig-head)
 107        else
 108                orig_head=$(cat "$state_dir"/head)
 109        fi &&
 110        GIT_QUIET=$(cat "$state_dir"/quiet) &&
 111        test -f "$state_dir"/verbose && verbose=t
 112        test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
 113        test -f "$state_dir"/strategy_opts &&
 114                strategy_opts="$(cat "$state_dir"/strategy_opts)"
 115        test -f "$state_dir"/allow_rerere_autoupdate &&
 116                allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
 117        test -f "$state_dir"/gpg_sign_opt &&
 118                gpg_sign_opt="$(cat "$state_dir"/gpg_sign_opt)"
 119}
 120
 121write_basic_state () {
 122        echo "$head_name" > "$state_dir"/head-name &&
 123        echo "$onto" > "$state_dir"/onto &&
 124        echo "$orig_head" > "$state_dir"/orig-head &&
 125        echo "$GIT_QUIET" > "$state_dir"/quiet &&
 126        test t = "$verbose" && : > "$state_dir"/verbose
 127        test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
 128        test -n "$strategy_opts" && echo "$strategy_opts" > \
 129                "$state_dir"/strategy_opts
 130        test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
 131                "$state_dir"/allow_rerere_autoupdate
 132        test -n "$gpg_sign_opt" && echo "$gpg_sign_opt" > "$state_dir"/gpg_sign_opt
 133}
 134
 135output () {
 136        case "$verbose" in
 137        '')
 138                output=$("$@" 2>&1 )
 139                status=$?
 140                test $status != 0 && printf "%s\n" "$output"
 141                return $status
 142                ;;
 143        *)
 144                "$@"
 145                ;;
 146        esac
 147}
 148
 149move_to_original_branch () {
 150        case "$head_name" in
 151        refs/*)
 152                message="rebase finished: $head_name onto $onto"
 153                git update-ref -m "$message" \
 154                        $head_name $(git rev-parse HEAD) $orig_head &&
 155                git symbolic-ref \
 156                        -m "rebase finished: returning to $head_name" \
 157                        HEAD $head_name ||
 158                die "$(eval_gettext "Could not move back to \$head_name")"
 159                ;;
 160        esac
 161}
 162
 163apply_autostash () {
 164        if test -f "$state_dir/autostash"
 165        then
 166                stash_sha1=$(cat "$state_dir/autostash")
 167                if git stash apply $stash_sha1 2>&1 >/dev/null
 168                then
 169                        echo "$(gettext 'Applied autostash.')" >&2
 170                else
 171                        git stash store -m "autostash" -q $stash_sha1 ||
 172                        die "$(eval_gettext "Cannot store \$stash_sha1")"
 173                        gettext 'Applying autostash resulted in conflicts.
 174Your changes are safe in the stash.
 175You can run "git stash pop" or "git stash drop" at any time.
 176' >&2
 177                fi
 178        fi
 179}
 180
 181finish_rebase () {
 182        apply_autostash &&
 183        { git gc --auto || true; } &&
 184        rm -rf "$state_dir"
 185}
 186
 187run_specific_rebase () {
 188        if [ "$interactive_rebase" = implied ]; then
 189                GIT_EDITOR=:
 190                export GIT_EDITOR
 191                autosquash=
 192        fi
 193        . git-rebase--$type
 194        ret=$?
 195        if test $ret -eq 0
 196        then
 197                finish_rebase
 198        elif test $ret -eq 2 # special exit status for rebase -i
 199        then
 200                apply_autostash &&
 201                rm -rf "$state_dir" &&
 202                die "Nothing to do"
 203        fi
 204        exit $ret
 205}
 206
 207run_pre_rebase_hook () {
 208        if test -z "$ok_to_skip_pre_rebase" &&
 209           test -x "$(git rev-parse --git-path hooks/pre-rebase)"
 210        then
 211                "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
 212                die "$(gettext "The pre-rebase hook refused to rebase.")"
 213        fi
 214}
 215
 216test -f "$apply_dir"/applying &&
 217        die "$(gettext "It looks like git-am is in progress. Cannot rebase.")"
 218
 219if test -d "$apply_dir"
 220then
 221        type=am
 222        state_dir="$apply_dir"
 223elif test -d "$merge_dir"
 224then
 225        if test -f "$merge_dir"/interactive
 226        then
 227                type=interactive
 228                interactive_rebase=explicit
 229        else
 230                type=merge
 231        fi
 232        state_dir="$merge_dir"
 233fi
 234test -n "$type" && in_progress=t
 235
 236total_argc=$#
 237while test $# != 0
 238do
 239        case "$1" in
 240        --no-verify)
 241                ok_to_skip_pre_rebase=yes
 242                ;;
 243        --verify)
 244                ok_to_skip_pre_rebase=
 245                ;;
 246        --continue|--skip|--abort|--quit|--edit-todo)
 247                test $total_argc -eq 2 || usage
 248                action=${1##--}
 249                ;;
 250        --onto=*)
 251                onto="${1#--onto=}"
 252                ;;
 253        --exec=*)
 254                cmd="${cmd}exec ${1#--exec=}${LF}"
 255                test -z "$interactive_rebase" && interactive_rebase=implied
 256                ;;
 257        --interactive)
 258                interactive_rebase=explicit
 259                ;;
 260        --keep-empty)
 261                keep_empty=yes
 262                ;;
 263        --preserve-merges)
 264                preserve_merges=t
 265                test -z "$interactive_rebase" && interactive_rebase=implied
 266                ;;
 267        --autosquash)
 268                autosquash=t
 269                ;;
 270        --no-autosquash)
 271                autosquash=
 272                ;;
 273        --fork-point)
 274                fork_point=t
 275                ;;
 276        --no-fork-point)
 277                fork_point=
 278                ;;
 279        --merge)
 280                do_merge=t
 281                ;;
 282        --strategy-option=*)
 283                strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}")"
 284                do_merge=t
 285                test -z "$strategy" && strategy=recursive
 286                ;;
 287        --strategy=*)
 288                strategy="${1#--strategy=}"
 289                do_merge=t
 290                ;;
 291        --no-stat)
 292                diffstat=
 293                ;;
 294        --stat)
 295                diffstat=t
 296                ;;
 297        --autostash)
 298                autostash=true
 299                ;;
 300        --no-autostash)
 301                autostash=false
 302                ;;
 303        --verbose)
 304                verbose=t
 305                diffstat=t
 306                GIT_QUIET=
 307                ;;
 308        --quiet)
 309                GIT_QUIET=t
 310                git_am_opt="$git_am_opt -q"
 311                verbose=
 312                diffstat=
 313                ;;
 314        --whitespace=*)
 315                git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
 316                case "${1#--whitespace=}" in
 317                fix|strip)
 318                        force_rebase=t
 319                        ;;
 320                esac
 321                ;;
 322        --ignore-whitespace)
 323                git_am_opt="$git_am_opt $1"
 324                ;;
 325        --committer-date-is-author-date|--ignore-date|--signoff|--no-signoff)
 326                git_am_opt="$git_am_opt $1"
 327                force_rebase=t
 328                ;;
 329        -C*)
 330                git_am_opt="$git_am_opt $1"
 331                ;;
 332        --root)
 333                rebase_root=t
 334                ;;
 335        --force-rebase|--no-ff)
 336                force_rebase=t
 337                ;;
 338        --rerere-autoupdate|--no-rerere-autoupdate)
 339                allow_rerere_autoupdate="$1"
 340                ;;
 341        --gpg-sign)
 342                gpg_sign_opt=-S
 343                ;;
 344        --gpg-sign=*)
 345                gpg_sign_opt="-S${1#--gpg-sign=}"
 346                ;;
 347        --)
 348                shift
 349                break
 350                ;;
 351        esac
 352        shift
 353done
 354test $# -gt 2 && usage
 355
 356if test -n "$action"
 357then
 358        test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 359        # Only interactive rebase uses detailed reflog messages
 360        if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
 361        then
 362                GIT_REFLOG_ACTION="rebase -i ($action)"
 363                export GIT_REFLOG_ACTION
 364        fi
 365fi
 366
 367if test "$action" = "edit-todo" && test "$type" != "interactive"
 368then
 369        die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 370fi
 371
 372case "$action" in
 373continue)
 374        # Sanity check
 375        git rev-parse --verify HEAD >/dev/null ||
 376                die "$(gettext "Cannot read HEAD")"
 377        git update-index --ignore-submodules --refresh &&
 378        git diff-files --quiet --ignore-submodules || {
 379                echo "$(gettext "You must edit all merge conflicts and then
 380mark them as resolved using git add")"
 381                exit 1
 382        }
 383        read_basic_state
 384        run_specific_rebase
 385        ;;
 386skip)
 387        output git reset --hard HEAD || exit $?
 388        read_basic_state
 389        run_specific_rebase
 390        ;;
 391abort)
 392        git rerere clear
 393        read_basic_state
 394        case "$head_name" in
 395        refs/*)
 396                git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 397                die "$(eval_gettext "Could not move back to \$head_name")"
 398                ;;
 399        esac
 400        output git reset --hard $orig_head
 401        finish_rebase
 402        exit
 403        ;;
 404quit)
 405        exec rm -rf "$state_dir"
 406        ;;
 407edit-todo)
 408        run_specific_rebase
 409        ;;
 410esac
 411
 412# Make sure no rebase is in progress
 413if test -n "$in_progress"
 414then
 415        state_dir_base=${state_dir##*/}
 416        cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 417        cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 418        die "
 419$(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 420I wonder if you are in the middle of another rebase.  If that is the
 421case, please try
 422        $cmd_live_rebase
 423If that is not the case, please
 424        $cmd_clear_stale_rebase
 425and run me again.  I am stopping in case you still have something
 426valuable there.')"
 427fi
 428
 429if test -n "$rebase_root" && test -z "$onto"
 430then
 431        test -z "$interactive_rebase" && interactive_rebase=implied
 432fi
 433
 434if test -n "$interactive_rebase"
 435then
 436        type=interactive
 437        state_dir="$merge_dir"
 438elif test -n "$do_merge"
 439then
 440        type=merge
 441        state_dir="$merge_dir"
 442else
 443        type=am
 444        state_dir="$apply_dir"
 445fi
 446
 447if test -z "$rebase_root"
 448then
 449        case "$#" in
 450        0)
 451                if ! upstream_name=$(git rev-parse --symbolic-full-name \
 452                        --verify -q @{upstream} 2>/dev/null)
 453                then
 454                        . git-parse-remote
 455                        error_on_missing_default_upstream "rebase" "rebase" \
 456                                "against" "git rebase $(gettext '<branch>')"
 457                fi
 458
 459                test "$fork_point" = auto && fork_point=t
 460                ;;
 461        *)      upstream_name="$1"
 462                if test "$upstream_name" = "-"
 463                then
 464                        upstream_name="@{-1}"
 465                fi
 466                shift
 467                ;;
 468        esac
 469        upstream=$(peel_committish "${upstream_name}") ||
 470        die "$(eval_gettext "invalid upstream \$upstream_name")"
 471        upstream_arg="$upstream_name"
 472else
 473        if test -z "$onto"
 474        then
 475                empty_tree=$(git hash-object -t tree /dev/null)
 476                onto=$(git commit-tree $empty_tree </dev/null)
 477                squash_onto="$onto"
 478        fi
 479        unset upstream_name
 480        unset upstream
 481        test $# -gt 1 && usage
 482        upstream_arg=--root
 483fi
 484
 485# Make sure the branch to rebase onto is valid.
 486onto_name=${onto-"$upstream_name"}
 487case "$onto_name" in
 488*...*)
 489        if      left=${onto_name%...*} right=${onto_name#*...} &&
 490                onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 491        then
 492                case "$onto" in
 493                ?*"$LF"?*)
 494                        die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 495                        ;;
 496                '')
 497                        die "$(eval_gettext "\$onto_name: there is no merge base")"
 498                        ;;
 499                esac
 500        else
 501                die "$(eval_gettext "\$onto_name: there is no merge base")"
 502        fi
 503        ;;
 504*)
 505        onto=$(peel_committish "$onto_name") ||
 506        die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 507        ;;
 508esac
 509
 510# If the branch to rebase is given, that is the branch we will rebase
 511# $branch_name -- branch being rebased, or HEAD (already detached)
 512# $orig_head -- commit object name of tip of the branch before rebasing
 513# $head_name -- refs/heads/<that-branch> or "detached HEAD"
 514switch_to=
 515case "$#" in
 5161)
 517        # Is it "rebase other $branchname" or "rebase other $commit"?
 518        branch_name="$1"
 519        switch_to="$1"
 520
 521        if git show-ref --verify --quiet -- "refs/heads/$1" &&
 522           orig_head=$(git rev-parse -q --verify "refs/heads/$1")
 523        then
 524                head_name="refs/heads/$1"
 525        elif orig_head=$(git rev-parse -q --verify "$1")
 526        then
 527                head_name="detached HEAD"
 528        else
 529                die "$(eval_gettext "fatal: no such branch: \$branch_name")"
 530        fi
 531        ;;
 5320)
 533        # Do not need to switch branches, we are already on it.
 534        if branch_name=$(git symbolic-ref -q HEAD)
 535        then
 536                head_name=$branch_name
 537                branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
 538        else
 539                head_name="detached HEAD"
 540                branch_name=HEAD ;# detached
 541        fi
 542        orig_head=$(git rev-parse --verify HEAD) || exit
 543        ;;
 544*)
 545        die "BUG: unexpected number of arguments left to parse"
 546        ;;
 547esac
 548
 549if test "$fork_point" = t
 550then
 551        new_upstream=$(git merge-base --fork-point "$upstream_name" \
 552                        "${switch_to:-HEAD}")
 553        if test -n "$new_upstream"
 554        then
 555                restrict_revision=$new_upstream
 556        fi
 557fi
 558
 559if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 560then
 561        stash_sha1=$(git stash create "autostash") ||
 562        die "$(gettext 'Cannot autostash')"
 563
 564        mkdir -p "$state_dir" &&
 565        echo $stash_sha1 >"$state_dir/autostash" &&
 566        stash_abbrev=$(git rev-parse --short $stash_sha1) &&
 567        echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
 568        git reset --hard
 569fi
 570
 571require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 572
 573# Now we are rebasing commits $upstream..$orig_head (or with --root,
 574# everything leading up to $orig_head) on top of $onto
 575
 576# Check if we are already based on $onto with linear history,
 577# but this should be done only when upstream and onto are the same
 578# and if this is not an interactive rebase.
 579mb=$(git merge-base "$onto" "$orig_head")
 580if test "$type" != interactive && test "$upstream" = "$onto" &&
 581        test "$mb" = "$onto" && test -z "$restrict_revision" &&
 582        # linear history?
 583        ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 584then
 585        if test -z "$force_rebase"
 586        then
 587                # Lazily switch to the target branch if needed...
 588                test -z "$switch_to" ||
 589                GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
 590                        git checkout -q "$switch_to" --
 591                say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 592                finish_rebase
 593                exit 0
 594        else
 595                say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 596        fi
 597fi
 598
 599# If a hook exists, give it a chance to interrupt
 600run_pre_rebase_hook "$upstream_arg" "$@"
 601
 602if test -n "$diffstat"
 603then
 604        if test -n "$verbose"
 605        then
 606                echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 607        fi
 608        # We want color (if set), but no pager
 609        GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 610fi
 611
 612test "$type" = interactive && run_specific_rebase
 613
 614# Detach HEAD and reset the tree
 615say "$(gettext "First, rewinding head to replay your work on top of it...")"
 616
 617GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 618        git checkout -q "$onto^0" || die "could not detach HEAD"
 619git update-ref ORIG_HEAD $orig_head
 620
 621# If the $onto is a proper descendant of the tip of the branch, then
 622# we just fast-forwarded.
 623if test "$mb" = "$orig_head"
 624then
 625        say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 626        move_to_original_branch
 627        finish_rebase
 628        exit 0
 629fi
 630
 631if test -n "$rebase_root"
 632then
 633        revisions="$onto..$orig_head"
 634else
 635        revisions="${restrict_revision-$upstream}..$orig_head"
 636fi
 637
 638run_specific_rebase