git-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 no-ff!             cherry-pick all commits, even if unchanged
  24 m,merge!           use merging strategies to rebase
  25 i,interactive!     let the user edit the list of commits to rebase
  26 x,exec=!           add exec lines after each commit of the editable list
  27 k,keep-empty       preserve empty commits during rebase
  28 allow-empty-message allow rebasing commits with empty messages
  29 f,force-rebase!    force rebase even if branch is up to date
  30 X,strategy-option=! pass the argument through to the merge strategy
  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 committer-date-is-author-date! passed to 'git am'
  38 ignore-date!       passed to 'git am'
  39 signoff            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 "
  52 . git-sh-setup
  53 set_reflog_action rebase
  54 require_work_tree_exists
  55 cd_to_toplevel
  56
  57 LF='
  58 '
  59 ok_to_skip_pre_rebase=
  60 resolvemsg="
  61 $(gettext 'Resolve all conflicts manually, mark them as resolved with
  62 "git add/rm <conflicted_files>", then run "git rebase --continue".
  63 You can instead skip this commit: run "git rebase --skip".
  64 To abort and get back to the state before "git rebase", run "git rebase --abort".')
  65 "
  66 squash_onto=
  67 unset onto
  68 unset restrict_revision
  69 cmd=
  70 strategy=
  71 strategy_opts=
  72 do_merge=
  73 merge_dir="$GIT_DIR"/rebase-merge
  74 apply_dir="$GIT_DIR"/rebase-apply
  75 verbose=
  76 diffstat=
  77 test "$(git config --bool rebase.stat)" = true && diffstat=t
  78 autostash="$(git config --bool rebase.autostash || echo false)"
  79 fork_point=auto
  80 git_am_opt=
  81 git_format_patch_opt=
  82 rebase_root=
  83 force_rebase=
  84 allow_rerere_autoupdate=
  85 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  86 in_progress=
  87 # One of {am, merge, interactive}
  88 type=
  89 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  90 state_dir=
  91 # One of {'', continue, skip, abort}, as parsed from command line
  92 action=
  93 rebase_merges=
  94 rebase_cousins=
  95 preserve_merges=
  96 autosquash=
  97 keep_empty=
  98 allow_empty_message=
  99 signoff=
 100 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
 101 case "$(git config --bool commit.gpgsign)" in
 102 true)   gpg_sign_opt=-S ;;
 103 *)      gpg_sign_opt= ;;
 104 esac
 105
 106 read_basic_state () {
 107         test -f "$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         GIT_QUIET=$(cat "$state_dir"/quiet) &&
 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 }
 134
 135 write_basic_state () {
 136         echo "$head_name" > "$state_dir"/head-name &&
 137         echo "$onto" > "$state_dir"/onto &&
 138         echo "$orig_head" > "$state_dir"/orig-head &&
 139         echo "$GIT_QUIET" > "$state_dir"/quiet &&
 140         test t = "$verbose" && : > "$state_dir"/verbose
 141         test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
 142         test -n "$strategy_opts" && echo "$strategy_opts" > \
 143                 "$state_dir"/strategy_opts
 144         test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
 145                 "$state_dir"/allow_rerere_autoupdate
 146         test -n "$gpg_sign_opt" && echo "$gpg_sign_opt" > "$state_dir"/gpg_sign_opt
 147         test -n "$signoff" && echo "$signoff" >"$state_dir"/signoff
 148 }
 149
 150 output () {
 151         case "$verbose" in
 152         '')
 153                 output=$("$@" 2>&1 )
 154                 status=$?
 155                 test $status != 0 && printf "%s\n" "$output"
 156                 return $status
 157                 ;;
 158         *)
 159                 "$@"
 160                 ;;
 161         esac
 162 }
 163
 164 move_to_original_branch () {
 165         case "$head_name" in
 166         refs/*)
 167                 message="rebase finished: $head_name onto $onto"
 168                 git update-ref -m "$message" \
 169                         $head_name $(git rev-parse HEAD) $orig_head &&
 170                 git symbolic-ref \
 171                         -m "rebase finished: returning to $head_name" \
 172                         HEAD $head_name ||
 173                 die "$(eval_gettext "Could not move back to \$head_name")"
 174                 ;;
 175         esac
 176 }
 177
 178 apply_autostash () {
 179         if test -f "$state_dir/autostash"
 180         then
 181                 stash_sha1=$(cat "$state_dir/autostash")
 182                 if git stash apply $stash_sha1 >/dev/null 2>&1
 183                 then
 184                         echo "$(gettext 'Applied autostash.')" >&2
 185                 else
 186                         git stash store -m "autostash" -q $stash_sha1 ||
 187                         die "$(eval_gettext "Cannot store \$stash_sha1")"
 188                         gettext 'Applying autostash resulted in conflicts.
 189 Your changes are safe in the stash.
 190 You can run "git stash pop" or "git stash drop" at any time.
 191 ' >&2
 192                 fi
 193         fi
 194 }
 195
 196 finish_rebase () {
 197         rm -f "$(git rev-parse --git-path REBASE_HEAD)"
 198         apply_autostash &&
 199         { git gc --auto || true; } &&
 200         rm -rf "$state_dir"
 201 }
 202
 203 run_interactive () {
 204         GIT_CHERRY_PICK_HELP="$resolvemsg"
 205         export GIT_CHERRY_PICK_HELP
 206
 207         test -n "$keep_empty" && keep_empty="--keep-empty"
 208         test -n "$rebase_merges" && rebase_merges="--rebase-merges"
 209         test -n "$rebase_cousins" && rebase_cousins="--rebase-cousins"
 210         test -n "$autosquash" && autosquash="--autosquash"
 211         test -n "$verbose" && verbose="--verbose"
 212         test -n "$force_rebase" && force_rebase="--no-ff"
 213         test -n "$restrict_revision" && \
 214                 restrict_revision="--restrict-revision=^$restrict_revision"
 215         test -n "$upstream" && upstream="--upstream=$upstream"
 216         test -n "$onto" && onto="--onto=$onto"
 217         test -n "$squash_onto" && squash_onto="--squash-onto=$squash_onto"
 218         test -n "$onto_name" && onto_name="--onto-name=$onto_name"
 219         test -n "$head_name" && head_name="--head-name=$head_name"
 220         test -n "$strategy" && strategy="--strategy=$strategy"
 221         test -n "$strategy_opts" && strategy_opts="--strategy-opts=$strategy_opts"
 222         test -n "$switch_to" && switch_to="--switch-to=$switch_to"
 223         test -n "$cmd" && cmd="--cmd=$cmd"
 224         test -n "$action" && action="--$action"
 225
 226         exec git rebase--interactive "$action" "$keep_empty" "$rebase_merges" "$rebase_cousins" \
 227                 "$upstream" "$onto" "$squash_onto" "$restrict_revision" \
 228                 "$allow_empty_message" "$autosquash" "$verbose" \
 229                 "$force_rebase" "$onto_name" "$head_name" "$strategy" \
 230                 "$strategy_opts" "$cmd" "$switch_to" \
 231                 "$allow_rerere_autoupdate" "$gpg_sign_opt" "$signoff"
 232 }
 233
 234 run_specific_rebase () {
 235         if [ "$interactive_rebase" = implied ]; then
 236                 GIT_EDITOR=:
 237                 export GIT_EDITOR
 238                 autosquash=
 239         fi
 240
 241         if test -n "$interactive_rebase" -a -z "$preserve_merges"
 242         then
 243                 run_interactive
 244         else
 245                 . git-rebase--$type
 246
 247                 if test -z "$preserve_merges"
 248                 then
 249                         git_rebase__$type
 250                 else
 251                         git_rebase__preserve_merges
 252                 fi
 253         fi
 254
 255         ret=$?
 256         if test $ret -eq 0
 257         then
 258                 finish_rebase
 259         elif test $ret -eq 2 # special exit status for rebase -p
 260         then
 261                 apply_autostash &&
 262                 rm -rf "$state_dir" &&
 263                 die "Nothing to do"
 264         fi
 265         exit $ret
 266 }
 267
 268 run_pre_rebase_hook () {
 269         if test -z "$ok_to_skip_pre_rebase" &&
 270            test -x "$(git rev-parse --git-path hooks/pre-rebase)"
 271         then
 272                 "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
 273                 die "$(gettext "The pre-rebase hook refused to rebase.")"
 274         fi
 275 }
 276
 277 test -f "$apply_dir"/applying &&
 278         die "$(gettext "It looks like 'git am' is in progress. Cannot rebase.")"
 279
 280 if test -d "$apply_dir"
 281 then
 282         type=am
 283         state_dir="$apply_dir"
 284 elif test -d "$merge_dir"
 285 then
 286         if test -d "$merge_dir"/rewritten
 287         then
 288                 type=preserve-merges
 289                 interactive_rebase=explicit
 290                 preserve_merges=t
 291         elif test -f "$merge_dir"/interactive
 292         then
 293                 type=interactive
 294                 interactive_rebase=explicit
 295         else
 296                 type=merge
 297         fi
 298         state_dir="$merge_dir"
 299 fi
 300 test -n "$type" && in_progress=t
 301
 302 total_argc=$#
 303 while test $# != 0
 304 do
 305         case "$1" in
 306         --no-verify)
 307                 ok_to_skip_pre_rebase=yes
 308                 ;;
 309         --verify)
 310                 ok_to_skip_pre_rebase=
 311                 ;;
 312         --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
 313                 test $total_argc -eq 2 || usage
 314                 action=${1##--}
 315                 ;;
 316         --onto=*)
 317                 onto="${1#--onto=}"
 318                 ;;
 319         --exec=*)
 320                 cmd="${cmd}exec ${1#--exec=}${LF}"
 321                 test -z "$interactive_rebase" && interactive_rebase=implied
 322                 ;;
 323         --interactive)
 324                 interactive_rebase=explicit
 325                 ;;
 326         --keep-empty)
 327                 keep_empty=yes
 328                 ;;
 329         --allow-empty-message)
 330                 allow_empty_message=--allow-empty-message
 331                 ;;
 332         --no-keep-empty)
 333                 keep_empty=
 334                 ;;
 335         --rebase-merges)
 336                 rebase_merges=t
 337                 test -z "$interactive_rebase" && interactive_rebase=implied
 338                 ;;
 339         --rebase-merges=*)
 340                 rebase_merges=t
 341                 case "${1#*=}" in
 342                 rebase-cousins) rebase_cousins=t;;
 343                 no-rebase-cousins) rebase_cousins=;;
 344                 *) die "Unknown mode: $1";;
 345                 esac
 346                 test -z "$interactive_rebase" && interactive_rebase=implied
 347                 ;;
 348         --preserve-merges)
 349                 preserve_merges=t
 350                 test -z "$interactive_rebase" && interactive_rebase=implied
 351                 ;;
 352         --autosquash)
 353                 autosquash=t
 354                 ;;
 355         --no-autosquash)
 356                 autosquash=
 357                 ;;
 358         --fork-point)
 359                 fork_point=t
 360                 ;;
 361         --no-fork-point)
 362                 fork_point=
 363                 ;;
 364         --merge)
 365                 do_merge=t
 366                 ;;
 367         --strategy-option=*)
 368                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}" | sed -e s/^.//)"
 369                 do_merge=t
 370                 test -z "$strategy" && strategy=recursive
 371                 ;;
 372         --strategy=*)
 373                 strategy="${1#--strategy=}"
 374                 do_merge=t
 375                 ;;
 376         --no-stat)
 377                 diffstat=
 378                 ;;
 379         --stat)
 380                 diffstat=t
 381                 ;;
 382         --autostash)
 383                 autostash=true
 384                 ;;
 385         --no-autostash)
 386                 autostash=false
 387                 ;;
 388         --verbose)
 389                 verbose=t
 390                 diffstat=t
 391                 GIT_QUIET=
 392                 ;;
 393         --quiet)
 394                 GIT_QUIET=t
 395                 git_am_opt="$git_am_opt -q"
 396                 verbose=
 397                 diffstat=
 398                 ;;
 399         --whitespace=*)
 400                 git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
 401                 case "${1#--whitespace=}" in
 402                 fix|strip)
 403                         force_rebase=t
 404                         ;;
 405                 esac
 406                 ;;
 407         --ignore-whitespace)
 408                 git_am_opt="$git_am_opt $1"
 409                 ;;
 410         --signoff)
 411                 signoff=--signoff
 412                 ;;
 413         --no-signoff)
 414                 signoff=
 415                 ;;
 416         --committer-date-is-author-date|--ignore-date)
 417                 git_am_opt="$git_am_opt $1"
 418                 force_rebase=t
 419                 ;;
 420         -C*)
 421                 git_am_opt="$git_am_opt $1"
 422                 ;;
 423         --root)
 424                 rebase_root=t
 425                 ;;
 426         --force-rebase|--no-ff)
 427                 force_rebase=t
 428                 ;;
 429         --rerere-autoupdate|--no-rerere-autoupdate)
 430                 allow_rerere_autoupdate="$1"
 431                 ;;
 432         --gpg-sign)
 433                 gpg_sign_opt=-S
 434                 ;;
 435         --gpg-sign=*)
 436                 gpg_sign_opt="-S${1#--gpg-sign=}"
 437                 ;;
 438         --)
 439                 shift
 440                 break
 441                 ;;
 442         *)
 443                 usage
 444                 ;;
 445         esac
 446         shift
 447 done
 448 test $# -gt 2 && usage
 449
 450 if test -n "$action"
 451 then
 452         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 453         # Only interactive rebase uses detailed reflog messages
 454         if test -n "$interactive_rebase" && test "$GIT_REFLOG_ACTION" = rebase
 455         then
 456                 GIT_REFLOG_ACTION="rebase -i ($action)"
 457                 export GIT_REFLOG_ACTION
 458         fi
 459 fi
 460
 461 if test "$action" = "edit-todo" && test -z "$interactive_rebase"
 462 then
 463         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 464 fi
 465
 466 case "$action" in
 467 continue)
 468         # Sanity check
 469         git rev-parse --verify HEAD >/dev/null ||
 470                 die "$(gettext "Cannot read HEAD")"
 471         git update-index --ignore-submodules --refresh &&
 472         git diff-files --quiet --ignore-submodules || {
 473                 echo "$(gettext "You must edit all merge conflicts and then
 474 mark them as resolved using git add")"
 475                 exit 1
 476         }
 477         read_basic_state
 478         run_specific_rebase
 479         ;;
 480 skip)
 481         output git reset --hard HEAD || exit $?
 482         read_basic_state
 483         run_specific_rebase
 484         ;;
 485 abort)
 486         git rerere clear
 487         read_basic_state
 488         case "$head_name" in
 489         refs/*)
 490                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 491                 die "$(eval_gettext "Could not move back to \$head_name")"
 492                 ;;
 493         esac
 494         output git reset --hard $orig_head
 495         finish_rebase
 496         exit
 497         ;;
 498 quit)
 499         exec rm -rf "$state_dir"
 500         ;;
 501 edit-todo)
 502         run_specific_rebase
 503         ;;
 504 show-current-patch)
 505         run_specific_rebase
 506         die "BUG: run_specific_rebase is not supposed to return here"
 507         ;;
 508 esac
 509
 510 # Make sure no rebase is in progress
 511 if test -n "$in_progress"
 512 then
 513         state_dir_base=${state_dir##*/}
 514         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 515         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 516         die "
 517 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 518 I wonder if you are in the middle of another rebase.  If that is the
 519 case, please try
 520         $cmd_live_rebase
 521 If that is not the case, please
 522         $cmd_clear_stale_rebase
 523 and run me again.  I am stopping in case you still have something
 524 valuable there.')"
 525 fi
 526
 527 if test -n "$rebase_root" && test -z "$onto"
 528 then
 529         test -z "$interactive_rebase" && interactive_rebase=implied
 530 fi
 531
 532 if test -n "$keep_empty"
 533 then
 534         test -z "$interactive_rebase" && interactive_rebase=implied
 535 fi
 536
 537 if test -n "$interactive_rebase"
 538 then
 539         if test -z "$preserve_merges"
 540         then
 541                 type=interactive
 542         else
 543                 type=preserve-merges
 544         fi
 545
 546         state_dir="$merge_dir"
 547 elif test -n "$do_merge"
 548 then
 549         type=merge
 550         state_dir="$merge_dir"
 551 else
 552         type=am
 553         state_dir="$apply_dir"
 554 fi
 555
 556 if test -t 2 && test -z "$GIT_QUIET"
 557 then
 558         git_format_patch_opt="$git_format_patch_opt --progress"
 559 fi
 560
 561 if test -n "$signoff"
 562 then
 563         test -n "$preserve_merges" &&
 564                 die "$(gettext "error: cannot combine '--signoff' with '--preserve-merges'")"
 565         git_am_opt="$git_am_opt $signoff"
 566         force_rebase=t
 567 fi
 568
 569 if test -z "$rebase_root"
 570 then
 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"
 594 else
 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 $# -gt 1 && usage
 604         upstream_arg=--root
 605 fi
 606
 607 # Make sure the branch to rebase onto is valid.
 608 onto_name=${onto-"$upstream_name"}
 609 case "$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         ;;
 630 esac
 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 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 636 switch_to=
 637 case "$#" in
 638 1)
 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         ;;
 657 0)
 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=$(git rev-parse --verify HEAD) || exit
 668         ;;
 669 *)
 670         die "BUG: unexpected number of arguments left to parse"
 671         ;;
 672 esac
 673
 674 if test "$fork_point" = t
 675 then
 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=$new_upstream
 681         fi
 682 fi
 683
 684 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 685 then
 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: $stash_abbrev')" &&
 693         git reset --hard
 694 fi
 695
 696 require_clean_work_tree "rebase" "$(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 $onto with linear history,
 702 # but this should be done only when upstream and onto are the same
 703 # and if this is not an interactive rebase.
 704 mb=$(git merge-base "$onto" "$orig_head")
 705 if 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
 709 then
 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
 734 fi
 735
 736 # If a hook exists, give it a chance to interrupt
 737 run_pre_rebase_hook "$upstream_arg" "$@"
 738
 739 if test -n "$diffstat"
 740 then
 741         if test -n "$verbose"
 742         then
 743                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 744         fi
 745         # We want color (if set), but no pager
 746         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 747 fi
 748
 749 test -n "$interactive_rebase" && run_specific_rebase
 750
 751 # Detach HEAD and reset the tree
 752 say "$(gettext "First, rewinding head to replay your work on top of it...")"
 753
 754 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 755         git checkout -q "$onto^0" || die "could not detach HEAD"
 756 git update-ref ORIG_HEAD $orig_head
 757
 758 # If the $onto is a proper descendant of the tip of the branch, then
 759 # we just fast-forwarded.
 760 if test "$mb" = "$orig_head"
 761 then
 762         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 763         move_to_original_branch
 764         finish_rebase
 765         exit 0
 766 fi
 767
 768 if test -n "$rebase_root"
 769 then
 770         revisions="$onto..$orig_head"
 771 else
 772         revisions="${restrict_revision-$upstream}..$orig_head"
 773 fi
 774
 775 run_specific_rebase