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 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 "
  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, "$GIT_DIR"/rebase-merge}
  90 state_dir=
  91 # One of {'', continue, skip, abort}, as parsed from command line
  92 action=
  93 rebase_merges=
  94 rebase_cousins=
  95 preserve_merges=
  96 autosquash=
  97 keep_empty=
  98 allow_empty_message=--allow-empty-message
  99 signoff=
 100 test "$(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_specific_rebase () {
 204         if [ "$interactive_rebase" = implied ]; then
 205                 GIT_EDITOR=:
 206                 export GIT_EDITOR
 207                 autosquash=
 208         fi
 209         . git-rebase--$type
 210         git_rebase__$type${preserve_merges:+__preserve_merges}
 211         ret=$?
 212         if test $ret -eq 0
 213         then
 214                 finish_rebase
 215         elif test $ret -eq 2 # special exit status for rebase -i
 216         then
 217                 apply_autostash &&
 218                 rm -rf "$state_dir" &&
 219                 die "Nothing to do"
 220         fi
 221         exit $ret
 222 }
 223
 224 run_pre_rebase_hook () {
 225         if test -z "$ok_to_skip_pre_rebase" &&
 226            test -x "$(git rev-parse --git-path hooks/pre-rebase)"
 227         then
 228                 "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
 229                 die "$(gettext "The pre-rebase hook refused to rebase.")"
 230         fi
 231 }
 232
 233 test -f "$apply_dir"/applying &&
 234         die "$(gettext "It looks like 'git am' is in progress. Cannot rebase.")"
 235
 236 if test -d "$apply_dir"
 237 then
 238         type=am
 239         state_dir="$apply_dir"
 240 elif test -d "$merge_dir"
 241 then
 242         if test -f "$merge_dir"/interactive
 243         then
 244                 type=interactive
 245                 interactive_rebase=explicit
 246         else
 247                 type=merge
 248         fi
 249         state_dir="$merge_dir"
 250 fi
 251 test -n "$type" && in_progress=t
 252
 253 total_argc=$#
 254 while test $# != 0
 255 do
 256         case "$1" in
 257         --no-verify)
 258                 ok_to_skip_pre_rebase=yes
 259                 ;;
 260         --verify)
 261                 ok_to_skip_pre_rebase=
 262                 ;;
 263         --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
 264                 test $total_argc -eq 2 || usage
 265                 action=${1##--}
 266                 ;;
 267         --onto=*)
 268                 onto="${1#--onto=}"
 269                 ;;
 270         --exec=*)
 271                 cmd="${cmd}exec ${1#--exec=}${LF}"
 272                 test -z "$interactive_rebase" && interactive_rebase=implied
 273                 ;;
 274         --interactive)
 275                 interactive_rebase=explicit
 276                 ;;
 277         --keep-empty)
 278                 keep_empty=yes
 279                 ;;
 280         --allow-empty-message)
 281                 allow_empty_message=--allow-empty-message
 282                 ;;
 283         --no-keep-empty)
 284                 keep_empty=
 285                 ;;
 286         --rebase-merges)
 287                 rebase_merges=t
 288                 test -z "$interactive_rebase" && interactive_rebase=implied
 289                 ;;
 290         --rebase-merges=*)
 291                 rebase_merges=t
 292                 case "${1#*=}" in
 293                 rebase-cousins) rebase_cousins=t;;
 294                 no-rebase-cousins) rebase_cousins=;;
 295                 *) die "Unknown mode: $1";;
 296                 esac
 297                 test -z "$interactive_rebase" && interactive_rebase=implied
 298                 ;;
 299         --preserve-merges)
 300                 preserve_merges=t
 301                 test -z "$interactive_rebase" && interactive_rebase=implied
 302                 ;;
 303         --autosquash)
 304                 autosquash=t
 305                 ;;
 306         --no-autosquash)
 307                 autosquash=
 308                 ;;
 309         --fork-point)
 310                 fork_point=t
 311                 ;;
 312         --no-fork-point)
 313                 fork_point=
 314                 ;;
 315         --merge)
 316                 do_merge=t
 317                 ;;
 318         --strategy-option=*)
 319                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}")"
 320                 do_merge=t
 321                 test -z "$strategy" && strategy=recursive
 322                 ;;
 323         --strategy=*)
 324                 strategy="${1#--strategy=}"
 325                 do_merge=t
 326                 ;;
 327         --no-stat)
 328                 diffstat=
 329                 ;;
 330         --stat)
 331                 diffstat=t
 332                 ;;
 333         --autostash)
 334                 autostash=true
 335                 ;;
 336         --no-autostash)
 337                 autostash=false
 338                 ;;
 339         --verbose)
 340                 verbose=t
 341                 diffstat=t
 342                 GIT_QUIET=
 343                 ;;
 344         --quiet)
 345                 GIT_QUIET=t
 346                 git_am_opt="$git_am_opt -q"
 347                 verbose=
 348                 diffstat=
 349                 ;;
 350         --whitespace=*)
 351                 git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
 352                 case "${1#--whitespace=}" in
 353                 fix|strip)
 354                         force_rebase=t
 355                         ;;
 356                 esac
 357                 ;;
 358         --ignore-whitespace)
 359                 git_am_opt="$git_am_opt $1"
 360                 ;;
 361         --signoff)
 362                 signoff=--signoff
 363                 ;;
 364         --no-signoff)
 365                 signoff=
 366                 ;;
 367         --committer-date-is-author-date|--ignore-date)
 368                 git_am_opt="$git_am_opt $1"
 369                 force_rebase=t
 370                 ;;
 371         -C*)
 372                 git_am_opt="$git_am_opt $1"
 373                 ;;
 374         --root)
 375                 rebase_root=t
 376                 ;;
 377         --force-rebase|--no-ff)
 378                 force_rebase=t
 379                 ;;
 380         --rerere-autoupdate|--no-rerere-autoupdate)
 381                 allow_rerere_autoupdate="$1"
 382                 ;;
 383         --gpg-sign)
 384                 gpg_sign_opt=-S
 385                 ;;
 386         --gpg-sign=*)
 387                 gpg_sign_opt="-S${1#--gpg-sign=}"
 388                 ;;
 389         --)
 390                 shift
 391                 break
 392                 ;;
 393         *)
 394                 usage
 395                 ;;
 396         esac
 397         shift
 398 done
 399 test $# -gt 2 && usage
 400
 401 if test -n "$action"
 402 then
 403         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 404         # Only interactive rebase uses detailed reflog messages
 405         if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
 406         then
 407                 GIT_REFLOG_ACTION="rebase -i ($action)"
 408                 export GIT_REFLOG_ACTION
 409         fi
 410 fi
 411
 412 if test "$action" = "edit-todo" && test "$type" != "interactive"
 413 then
 414         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 415 fi
 416
 417 case "$action" in
 418 continue)
 419         # Sanity check
 420         git rev-parse --verify HEAD >/dev/null ||
 421                 die "$(gettext "Cannot read HEAD")"
 422         git update-index --ignore-submodules --refresh &&
 423         git diff-files --quiet --ignore-submodules || {
 424                 echo "$(gettext "You must edit all merge conflicts and then
 425 mark them as resolved using git add")"
 426                 exit 1
 427         }
 428         read_basic_state
 429         run_specific_rebase
 430         ;;
 431 skip)
 432         output git reset --hard HEAD || exit $?
 433         read_basic_state
 434         run_specific_rebase
 435         ;;
 436 abort)
 437         git rerere clear
 438         read_basic_state
 439         case "$head_name" in
 440         refs/*)
 441                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 442                 die "$(eval_gettext "Could not move back to \$head_name")"
 443                 ;;
 444         esac
 445         output git reset --hard $orig_head
 446         finish_rebase
 447         exit
 448         ;;
 449 quit)
 450         exec rm -rf "$state_dir"
 451         ;;
 452 edit-todo)
 453         run_specific_rebase
 454         ;;
 455 show-current-patch)
 456         run_specific_rebase
 457         die "BUG: run_specific_rebase is not supposed to return here"
 458         ;;
 459 esac
 460
 461 # Make sure no rebase is in progress
 462 if test -n "$in_progress"
 463 then
 464         state_dir_base=${state_dir##*/}
 465         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 466         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 467         die "
 468 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 469 I wonder if you are in the middle of another rebase.  If that is the
 470 case, please try
 471         $cmd_live_rebase
 472 If that is not the case, please
 473         $cmd_clear_stale_rebase
 474 and run me again.  I am stopping in case you still have something
 475 valuable there.')"
 476 fi
 477
 478 if test -n "$rebase_root" && test -z "$onto"
 479 then
 480         test -z "$interactive_rebase" && interactive_rebase=implied
 481 fi
 482
 483 if test -n "$keep_empty"
 484 then
 485         test -z "$interactive_rebase" && interactive_rebase=implied
 486 fi
 487
 488 if test -n "$interactive_rebase"
 489 then
 490         type=interactive
 491         state_dir="$merge_dir"
 492 elif test -n "$do_merge"
 493 then
 494         type=merge
 495         state_dir="$merge_dir"
 496 else
 497         type=am
 498         state_dir="$apply_dir"
 499 fi
 500
 501 if test -t 2 && test -z "$GIT_QUIET"
 502 then
 503         git_format_patch_opt="$git_format_patch_opt --progress"
 504 fi
 505
 506 if test -n "$git_am_opt"; then
 507         incompatible_opts=$(echo " $git_am_opt " | \
 508                             sed -e 's/ -q / /g' -e 's/^ \(.*\) $/\1/')
 509         if test -n "$interactive_rebase"
 510         then
 511                 if test -n "$incompatible_opts"
 512                 then
 513                         die "$(gettext "error: cannot combine interactive options (--interactive, --exec, --rebase-merges, --preserve-merges, --keep-empty, --root + --onto) with am options ($incompatible_opts)")"
 514                 fi
 515         fi
 516         if test -n "$do_merge"; then
 517                 if test -n "$incompatible_opts"
 518                 then
 519                         die "$(gettext "error: cannot combine merge options (--merge, --strategy, --strategy-option) with am options ($incompatible_opts)")"
 520                 fi
 521         fi
 522 fi
 523
 524 if test -n "$signoff"
 525 then
 526         test -n "$preserve_merges" &&
 527                 die "$(gettext "error: cannot combine '--signoff' with '--preserve-merges'")"
 528         git_am_opt="$git_am_opt $signoff"
 529         force_rebase=t
 530 fi
 531
 532 if test -n "$preserve_merges"
 533 then
 534         # Note: incompatibility with --signoff handled in signoff block above
 535         # Note: incompatibility with --interactive is just a strong warning;
 536         #       git-rebase.txt caveats with "unless you know what you are doing"
 537         test -n "$rebase_merges" &&
 538                 die "$(gettext "error: cannot combine '--preserve_merges' with '--rebase-merges'")"
 539 fi
 540
 541 if test -n "$rebase_merges"
 542 then
 543         test -n "$strategy_opts" &&
 544                 die "$(gettext "error: cannot combine '--rebase_merges' with '--strategy-option'")"
 545         test -n "$strategy" &&
 546                 die "$(gettext "error: cannot combine '--rebase_merges' with '--strategy'")"
 547 fi
 548
 549 if test -z "$rebase_root"
 550 then
 551         case "$#" in
 552         0)
 553                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
 554                         --verify -q @{upstream} 2>/dev/null)
 555                 then
 556                         . git-parse-remote
 557                         error_on_missing_default_upstream "rebase" "rebase" \
 558                                 "against" "git rebase $(gettext '<branch>')"
 559                 fi
 560
 561                 test "$fork_point" = auto && fork_point=t
 562                 ;;
 563         *)      upstream_name="$1"
 564                 if test "$upstream_name" = "-"
 565                 then
 566                         upstream_name="@{-1}"
 567                 fi
 568                 shift
 569                 ;;
 570         esac
 571         upstream=$(peel_committish "${upstream_name}") ||
 572         die "$(eval_gettext "invalid upstream '\$upstream_name'")"
 573         upstream_arg="$upstream_name"
 574 else
 575         if test -z "$onto"
 576         then
 577                 empty_tree=$(git hash-object -t tree /dev/null)
 578                 onto=$(git commit-tree $empty_tree </dev/null)
 579                 squash_onto="$onto"
 580         fi
 581         unset upstream_name
 582         unset upstream
 583         test $# -gt 1 && usage
 584         upstream_arg=--root
 585 fi
 586
 587 # Make sure the branch to rebase onto is valid.
 588 onto_name=${onto-"$upstream_name"}
 589 case "$onto_name" in
 590 *...*)
 591         if      left=${onto_name%...*} right=${onto_name#*...} &&
 592                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 593         then
 594                 case "$onto" in
 595                 ?*"$LF"?*)
 596                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 597                         ;;
 598                 '')
 599                         die "$(eval_gettext "\$onto_name: there is no merge base")"
 600                         ;;
 601                 esac
 602         else
 603                 die "$(eval_gettext "\$onto_name: there is no merge base")"
 604         fi
 605         ;;
 606 *)
 607         onto=$(peel_committish "$onto_name") ||
 608         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 609         ;;
 610 esac
 611
 612 # If the branch to rebase is given, that is the branch we will rebase
 613 # $branch_name -- branch/commit being rebased, or HEAD (already detached)
 614 # $orig_head -- commit object name of tip of the branch before rebasing
 615 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 616 switch_to=
 617 case "$#" in
 618 1)
 619         # Is it "rebase other $branchname" or "rebase other $commit"?
 620         branch_name="$1"
 621         switch_to="$1"
 622
 623         # Is it a local branch?
 624         if git show-ref --verify --quiet -- "refs/heads/$branch_name" &&
 625            orig_head=$(git rev-parse -q --verify "refs/heads/$branch_name")
 626         then
 627                 head_name="refs/heads/$branch_name"
 628         # If not is it a valid ref (branch or commit)?
 629         elif orig_head=$(git rev-parse -q --verify "$branch_name")
 630         then
 631                 head_name="detached HEAD"
 632
 633         else
 634                 die "$(eval_gettext "fatal: no such branch/commit '\$branch_name'")"
 635         fi
 636         ;;
 637 0)
 638         # Do not need to switch branches, we are already on it.
 639         if branch_name=$(git symbolic-ref -q HEAD)
 640         then
 641                 head_name=$branch_name
 642                 branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
 643         else
 644                 head_name="detached HEAD"
 645                 branch_name=HEAD
 646         fi
 647         orig_head=$(git rev-parse --verify HEAD) || exit
 648         ;;
 649 *)
 650         die "BUG: unexpected number of arguments left to parse"
 651         ;;
 652 esac
 653
 654 if test "$fork_point" = t
 655 then
 656         new_upstream=$(git merge-base --fork-point "$upstream_name" \
 657                         "${switch_to:-HEAD}")
 658         if test -n "$new_upstream"
 659         then
 660                 restrict_revision=$new_upstream
 661         fi
 662 fi
 663
 664 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 665 then
 666         stash_sha1=$(git stash create "autostash") ||
 667         die "$(gettext 'Cannot autostash')"
 668
 669         mkdir -p "$state_dir" &&
 670         echo $stash_sha1 >"$state_dir/autostash" &&
 671         stash_abbrev=$(git rev-parse --short $stash_sha1) &&
 672         echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
 673         git reset --hard
 674 fi
 675
 676 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 677
 678 # Now we are rebasing commits $upstream..$orig_head (or with --root,
 679 # everything leading up to $orig_head) on top of $onto
 680
 681 # Check if we are already based on $onto with linear history,
 682 # but this should be done only when upstream and onto are the same
 683 # and if this is not an interactive rebase.
 684 mb=$(git merge-base "$onto" "$orig_head")
 685 if test "$type" != interactive && test "$upstream" = "$onto" &&
 686         test "$mb" = "$onto" && test -z "$restrict_revision" &&
 687         # linear history?
 688         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 689 then
 690         if test -z "$force_rebase"
 691         then
 692                 # Lazily switch to the target branch if needed...
 693                 test -z "$switch_to" ||
 694                 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
 695                         git checkout -q "$switch_to" --
 696                 if test "$branch_name" = "HEAD" &&
 697                          ! git symbolic-ref -q HEAD
 698                 then
 699                         say "$(eval_gettext "HEAD is up to date.")"
 700                 else
 701                         say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 702                 fi
 703                 finish_rebase
 704                 exit 0
 705         else
 706                 if test "$branch_name" = "HEAD" &&
 707                          ! git symbolic-ref -q HEAD
 708                 then
 709                         say "$(eval_gettext "HEAD is up to date, rebase forced.")"
 710                 else
 711                         say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 712                 fi
 713         fi
 714 fi
 715
 716 # If a hook exists, give it a chance to interrupt
 717 run_pre_rebase_hook "$upstream_arg" "$@"
 718
 719 if test -n "$diffstat"
 720 then
 721         if test -n "$verbose"
 722         then
 723                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 724         fi
 725         # We want color (if set), but no pager
 726         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 727 fi
 728
 729 test "$type" = interactive && run_specific_rebase
 730
 731 # Detach HEAD and reset the tree
 732 say "$(gettext "First, rewinding head to replay your work on top of it...")"
 733
 734 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 735         git checkout -q "$onto^0" || die "could not detach HEAD"
 736 git update-ref ORIG_HEAD $orig_head
 737
 738 # If the $onto is a proper descendant of the tip of the branch, then
 739 # we just fast-forwarded.
 740 if test "$mb" = "$orig_head"
 741 then
 742         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 743         move_to_original_branch
 744         finish_rebase
 745         exit 0
 746 fi
 747
 748 if test -n "$rebase_root"
 749 then
 750         revisions="$onto..$orig_head"
 751 else
 752         revisions="${restrict_revision-$upstream}..$orig_head"
 753 fi
 754
 755 run_specific_rebase