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