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 whitespace=!       passed to 'git apply'
  38 ignore-whitespace! passed to 'git apply'
  39 C=!                passed to 'git apply'
  40 S,gpg-sign?        GPG-sign commits
  41  Actions:
  42 continue!          continue
  43 abort!             abort and check out the original branch
  44 skip!              skip current patch and continue
  45 edit-todo!         edit the todo list during an interactive rebase
  46 "
  47 . git-sh-setup
  48 . git-sh-i18n
  49 set_reflog_action rebase
  50 require_work_tree_exists
  51 cd_to_toplevel
  52
  53 LF='
  54 '
  55 ok_to_skip_pre_rebase=
  56 resolvemsg="
  57 $(gettext 'When you have resolved this problem, run "git rebase --continue".
  58 If you prefer to skip this patch, run "git rebase --skip" instead.
  59 To check out the original branch and stop rebasing, run "git rebase --abort".')
  60 "
  61 unset onto
  62 unset restrict_revision
  63 cmd=
  64 strategy=
  65 strategy_opts=
  66 do_merge=
  67 merge_dir="$GIT_DIR"/rebase-merge
  68 apply_dir="$GIT_DIR"/rebase-apply
  69 verbose=
  70 diffstat=
  71 test "$(git config --bool rebase.stat)" = true && diffstat=t
  72 autostash="$(git config --bool rebase.autostash || echo false)"
  73 fork_point=auto
  74 git_am_opt=
  75 rebase_root=
  76 force_rebase=
  77 allow_rerere_autoupdate=
  78 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  79 in_progress=
  80 # One of {am, merge, interactive}
  81 type=
  82 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  83 state_dir=
  84 # One of {'', continue, skip, abort}, as parsed from command line
  85 action=
  86 preserve_merges=
  87 autosquash=
  88 keep_empty=
  89 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  90 case "$(git config --bool commit.gpgsign)" in
  91 true)   gpg_sign_opt=-S ;;
  92 *)      gpg_sign_opt= ;;
  93 esac
  94
  95 read_basic_state () {
  96         test -f "$state_dir/head-name" &&
  97         test -f "$state_dir/onto" &&
  98         head_name=$(cat "$state_dir"/head-name) &&
  99         onto=$(cat "$state_dir"/onto) &&
 100         # We always write to orig-head, but interactive rebase used to write to
 101         # head. Fall back to reading from head to cover for the case that the
 102         # user upgraded git with an ongoing interactive rebase.
 103         if test -f "$state_dir"/orig-head
 104         then
 105                 orig_head=$(cat "$state_dir"/orig-head)
 106         else
 107                 orig_head=$(cat "$state_dir"/head)
 108         fi &&
 109         GIT_QUIET=$(cat "$state_dir"/quiet) &&
 110         test -f "$state_dir"/verbose && verbose=t
 111         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
 112         test -f "$state_dir"/strategy_opts &&
 113                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
 114         test -f "$state_dir"/allow_rerere_autoupdate &&
 115                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
 116         test -f "$state_dir"/gpg_sign_opt &&
 117                 gpg_sign_opt="$(cat "$state_dir"/gpg_sign_opt)"
 118 }
 119
 120 write_basic_state () {
 121         echo "$head_name" > "$state_dir"/head-name &&
 122         echo "$onto" > "$state_dir"/onto &&
 123         echo "$orig_head" > "$state_dir"/orig-head &&
 124         echo "$GIT_QUIET" > "$state_dir"/quiet &&
 125         test t = "$verbose" && : > "$state_dir"/verbose
 126         test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
 127         test -n "$strategy_opts" && echo "$strategy_opts" > \
 128                 "$state_dir"/strategy_opts
 129         test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
 130                 "$state_dir"/allow_rerere_autoupdate
 131         test -n "$gpg_sign_opt" && echo "$gpg_sign_opt" > "$state_dir"/gpg_sign_opt
 132 }
 133
 134 output () {
 135         case "$verbose" in
 136         '')
 137                 output=$("$@" 2>&1 )
 138                 status=$?
 139                 test $status != 0 && printf "%s\n" "$output"
 140                 return $status
 141                 ;;
 142         *)
 143                 "$@"
 144                 ;;
 145         esac
 146 }
 147
 148 move_to_original_branch () {
 149         case "$head_name" in
 150         refs/*)
 151                 message="rebase finished: $head_name onto $onto"
 152                 git update-ref -m "$message" \
 153                         $head_name $(git rev-parse HEAD) $orig_head &&
 154                 git symbolic-ref \
 155                         -m "rebase finished: returning to $head_name" \
 156                         HEAD $head_name ||
 157                 die "$(gettext "Could not move back to $head_name")"
 158                 ;;
 159         esac
 160 }
 161
 162 apply_autostash () {
 163         if test -f "$state_dir/autostash"
 164         then
 165                 stash_sha1=$(cat "$state_dir/autostash")
 166                 if git stash apply $stash_sha1 2>&1 >/dev/null
 167                 then
 168                         echo "$(gettext 'Applied autostash.')"
 169                 else
 170                         git stash store -m "autostash" -q $stash_sha1 ||
 171                         die "$(eval_gettext "Cannot store \$stash_sha1")"
 172                         gettext 'Applying autostash resulted in conflicts.
 173 Your changes are safe in the stash.
 174 You can run "git stash pop" or "git stash drop" at any time.
 175 '
 176                 fi
 177         fi
 178 }
 179
 180 finish_rebase () {
 181         apply_autostash &&
 182         { git gc --auto || true; } &&
 183         rm -rf "$state_dir"
 184 }
 185
 186 run_specific_rebase () {
 187         if [ "$interactive_rebase" = implied ]; then
 188                 GIT_EDITOR=:
 189                 export GIT_EDITOR
 190                 autosquash=
 191         fi
 192         . git-rebase--$type
 193         ret=$?
 194         if test $ret -eq 0
 195         then
 196                 finish_rebase
 197         elif test $ret -eq 2 # special exit status for rebase -i
 198         then
 199                 apply_autostash &&
 200                 rm -rf "$state_dir" &&
 201                 die "Nothing to do"
 202         fi
 203         exit $ret
 204 }
 205
 206 run_pre_rebase_hook () {
 207         if test -z "$ok_to_skip_pre_rebase" &&
 208            test -x "$(git rev-parse --git-path hooks/pre-rebase)"
 209         then
 210                 "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
 211                 die "$(gettext "The pre-rebase hook refused to rebase.")"
 212         fi
 213 }
 214
 215 test -f "$apply_dir"/applying &&
 216         die "$(gettext "It looks like git-am is in progress. Cannot rebase.")"
 217
 218 if test -d "$apply_dir"
 219 then
 220         type=am
 221         state_dir="$apply_dir"
 222 elif test -d "$merge_dir"
 223 then
 224         if test -f "$merge_dir"/interactive
 225         then
 226                 type=interactive
 227                 interactive_rebase=explicit
 228         else
 229                 type=merge
 230         fi
 231         state_dir="$merge_dir"
 232 fi
 233 test -n "$type" && in_progress=t
 234
 235 total_argc=$#
 236 while test $# != 0
 237 do
 238         case "$1" in
 239         --no-verify)
 240                 ok_to_skip_pre_rebase=yes
 241                 ;;
 242         --verify)
 243                 ok_to_skip_pre_rebase=
 244                 ;;
 245         --continue|--skip|--abort|--edit-todo)
 246                 test $total_argc -eq 2 || usage
 247                 action=${1##--}
 248                 ;;
 249         --onto=*)
 250                 onto="${1#--onto=}"
 251                 ;;
 252         --exec=*)
 253                 cmd="${cmd}exec ${1#--exec=}${LF}"
 254                 test -z "$interactive_rebase" && interactive_rebase=implied
 255                 ;;
 256         --interactive)
 257                 interactive_rebase=explicit
 258                 ;;
 259         --keep-empty)
 260                 keep_empty=yes
 261                 ;;
 262         --preserve-merges)
 263                 preserve_merges=t
 264                 test -z "$interactive_rebase" && interactive_rebase=implied
 265                 ;;
 266         --autosquash)
 267                 autosquash=t
 268                 ;;
 269         --no-autosquash)
 270                 autosquash=
 271                 ;;
 272         --fork-point)
 273                 fork_point=t
 274                 ;;
 275         --no-fork-point)
 276                 fork_point=
 277                 ;;
 278         --merge)
 279                 do_merge=t
 280                 ;;
 281         --strategy-option=*)
 282                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}")"
 283                 do_merge=t
 284                 test -z "$strategy" && strategy=recursive
 285                 ;;
 286         --strategy=*)
 287                 strategy="${1#--strategy=}"
 288                 do_merge=t
 289                 ;;
 290         --no-stat)
 291                 diffstat=
 292                 ;;
 293         --stat)
 294                 diffstat=t
 295                 ;;
 296         --autostash)
 297                 autostash=true
 298                 ;;
 299         --no-autostash)
 300                 autostash=false
 301                 ;;
 302         --verbose)
 303                 verbose=t
 304                 diffstat=t
 305                 GIT_QUIET=
 306                 ;;
 307         --quiet)
 308                 GIT_QUIET=t
 309                 git_am_opt="$git_am_opt -q"
 310                 verbose=
 311                 diffstat=
 312                 ;;
 313         --whitespace=*)
 314                 git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
 315                 case "${1#--whitespace=}" in
 316                 fix|strip)
 317                         force_rebase=t
 318                         ;;
 319                 esac
 320                 ;;
 321         --ignore-whitespace)
 322                 git_am_opt="$git_am_opt $1"
 323                 ;;
 324         --committer-date-is-author-date|--ignore-date)
 325                 git_am_opt="$git_am_opt $1"
 326                 force_rebase=t
 327                 ;;
 328         -C*)
 329                 git_am_opt="$git_am_opt $1"
 330                 ;;
 331         --root)
 332                 rebase_root=t
 333                 ;;
 334         --force-rebase|--no-ff)
 335                 force_rebase=t
 336                 ;;
 337         --rerere-autoupdate|--no-rerere-autoupdate)
 338                 allow_rerere_autoupdate="$1"
 339                 ;;
 340         --gpg-sign)
 341                 gpg_sign_opt=-S
 342                 ;;
 343         --gpg-sign=*)
 344                 gpg_sign_opt="-S${1#--gpg-sign=}"
 345                 ;;
 346         --)
 347                 shift
 348                 break
 349                 ;;
 350         esac
 351         shift
 352 done
 353 test $# -gt 2 && usage
 354
 355 if test -n "$action"
 356 then
 357         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 358         # Only interactive rebase uses detailed reflog messages
 359         if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
 360         then
 361                 GIT_REFLOG_ACTION="rebase -i ($action)"
 362                 export GIT_REFLOG_ACTION
 363         fi
 364 fi
 365
 366 if test "$action" = "edit-todo" && test "$type" != "interactive"
 367 then
 368         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 369 fi
 370
 371 case "$action" in
 372 continue)
 373         # Sanity check
 374         git rev-parse --verify HEAD >/dev/null ||
 375                 die "$(gettext "Cannot read HEAD")"
 376         git update-index --ignore-submodules --refresh &&
 377         git diff-files --quiet --ignore-submodules || {
 378                 echo "$(gettext "You must edit all merge conflicts and then
 379 mark them as resolved using git add")"
 380                 exit 1
 381         }
 382         read_basic_state
 383         run_specific_rebase
 384         ;;
 385 skip)
 386         output git reset --hard HEAD || exit $?
 387         read_basic_state
 388         run_specific_rebase
 389         ;;
 390 abort)
 391         git rerere clear
 392         read_basic_state
 393         case "$head_name" in
 394         refs/*)
 395                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 396                 die "$(eval_gettext "Could not move back to \$head_name")"
 397                 ;;
 398         esac
 399         output git reset --hard $orig_head
 400         finish_rebase
 401         exit
 402         ;;
 403 edit-todo)
 404         run_specific_rebase
 405         ;;
 406 esac
 407
 408 # Make sure no rebase is in progress
 409 if test -n "$in_progress"
 410 then
 411         state_dir_base=${state_dir##*/}
 412         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 413         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 414         die "
 415 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 416 I wonder if you are in the middle of another rebase.  If that is the
 417 case, please try
 418         $cmd_live_rebase
 419 If that is not the case, please
 420         $cmd_clear_stale_rebase
 421 and run me again.  I am stopping in case you still have something
 422 valuable there.')"
 423 fi
 424
 425 if test -n "$rebase_root" && test -z "$onto"
 426 then
 427         test -z "$interactive_rebase" && interactive_rebase=implied
 428 fi
 429
 430 if test -n "$interactive_rebase"
 431 then
 432         type=interactive
 433         state_dir="$merge_dir"
 434 elif test -n "$do_merge"
 435 then
 436         type=merge
 437         state_dir="$merge_dir"
 438 else
 439         type=am
 440         state_dir="$apply_dir"
 441 fi
 442
 443 if test -z "$rebase_root"
 444 then
 445         case "$#" in
 446         0)
 447                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
 448                         --verify -q @{upstream} 2>/dev/null)
 449                 then
 450                         . git-parse-remote
 451                         error_on_missing_default_upstream "rebase" "rebase" \
 452                                 "against" "git rebase <branch>"
 453                 fi
 454
 455                 test "$fork_point" = auto && fork_point=t
 456                 ;;
 457         *)      upstream_name="$1"
 458                 if test "$upstream_name" = "-"
 459                 then
 460                         upstream_name="@{-1}"
 461                 fi
 462                 shift
 463                 ;;
 464         esac
 465         upstream=$(peel_committish "${upstream_name}") ||
 466         die "$(eval_gettext "invalid upstream \$upstream_name")"
 467         upstream_arg="$upstream_name"
 468 else
 469         if test -z "$onto"
 470         then
 471                 empty_tree=$(git hash-object -t tree /dev/null)
 472                 onto=$(git commit-tree $empty_tree </dev/null)
 473                 squash_onto="$onto"
 474         fi
 475         unset upstream_name
 476         unset upstream
 477         test $# -gt 1 && usage
 478         upstream_arg=--root
 479 fi
 480
 481 # Make sure the branch to rebase onto is valid.
 482 onto_name=${onto-"$upstream_name"}
 483 case "$onto_name" in
 484 *...*)
 485         if      left=${onto_name%...*} right=${onto_name#*...} &&
 486                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 487         then
 488                 case "$onto" in
 489                 ?*"$LF"?*)
 490                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 491                         ;;
 492                 '')
 493                         die "$(eval_gettext "\$onto_name: there is no merge base")"
 494                         ;;
 495                 esac
 496         else
 497                 die "$(eval_gettext "\$onto_name: there is no merge base")"
 498         fi
 499         ;;
 500 *)
 501         onto=$(peel_committish "$onto_name") ||
 502         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 503         ;;
 504 esac
 505
 506 # If the branch to rebase is given, that is the branch we will rebase
 507 # $branch_name -- branch being rebased, or HEAD (already detached)
 508 # $orig_head -- commit object name of tip of the branch before rebasing
 509 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 510 switch_to=
 511 case "$#" in
 512 1)
 513         # Is it "rebase other $branchname" or "rebase other $commit"?
 514         branch_name="$1"
 515         switch_to="$1"
 516
 517         if git show-ref --verify --quiet -- "refs/heads/$1" &&
 518            orig_head=$(git rev-parse -q --verify "refs/heads/$1")
 519         then
 520                 head_name="refs/heads/$1"
 521         elif orig_head=$(git rev-parse -q --verify "$1")
 522         then
 523                 head_name="detached HEAD"
 524         else
 525                 die "$(eval_gettext "fatal: no such branch: \$branch_name")"
 526         fi
 527         ;;
 528 0)
 529         # Do not need to switch branches, we are already on it.
 530         if branch_name=$(git symbolic-ref -q HEAD)
 531         then
 532                 head_name=$branch_name
 533                 branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
 534         else
 535                 head_name="detached HEAD"
 536                 branch_name=HEAD ;# detached
 537         fi
 538         orig_head=$(git rev-parse --verify HEAD) || exit
 539         ;;
 540 *)
 541         die "BUG: unexpected number of arguments left to parse"
 542         ;;
 543 esac
 544
 545 if test "$fork_point" = t
 546 then
 547         new_upstream=$(git merge-base --fork-point "$upstream_name" \
 548                         "${switch_to:-HEAD}")
 549         if test -n "$new_upstream"
 550         then
 551                 restrict_revision=$new_upstream
 552         fi
 553 fi
 554
 555 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 556 then
 557         stash_sha1=$(git stash create "autostash") ||
 558         die "$(gettext 'Cannot autostash')"
 559
 560         mkdir -p "$state_dir" &&
 561         echo $stash_sha1 >"$state_dir/autostash" &&
 562         stash_abbrev=$(git rev-parse --short $stash_sha1) &&
 563         echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
 564         git reset --hard
 565 fi
 566
 567 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 568
 569 # Now we are rebasing commits $upstream..$orig_head (or with --root,
 570 # everything leading up to $orig_head) on top of $onto
 571
 572 # Check if we are already based on $onto with linear history,
 573 # but this should be done only when upstream and onto are the same
 574 # and if this is not an interactive rebase.
 575 mb=$(git merge-base "$onto" "$orig_head")
 576 if test "$type" != interactive && test "$upstream" = "$onto" &&
 577         test "$mb" = "$onto" && test -z "$restrict_revision" &&
 578         # linear history?
 579         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 580 then
 581         if test -z "$force_rebase"
 582         then
 583                 # Lazily switch to the target branch if needed...
 584                 test -z "$switch_to" ||
 585                 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
 586                         git checkout -q "$switch_to" --
 587                 say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 588                 finish_rebase
 589                 exit 0
 590         else
 591                 say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 592         fi
 593 fi
 594
 595 # If a hook exists, give it a chance to interrupt
 596 run_pre_rebase_hook "$upstream_arg" "$@"
 597
 598 if test -n "$diffstat"
 599 then
 600         if test -n "$verbose"
 601         then
 602                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 603         fi
 604         # We want color (if set), but no pager
 605         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 606 fi
 607
 608 test "$type" = interactive && run_specific_rebase
 609
 610 # Detach HEAD and reset the tree
 611 say "$(gettext "First, rewinding head to replay your work on top of it...")"
 612
 613 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 614         git checkout -q "$onto^0" || die "could not detach HEAD"
 615 git update-ref ORIG_HEAD $orig_head
 616
 617 # If the $onto is a proper descendant of the tip of the branch, then
 618 # we just fast-forwarded.
 619 if test "$mb" = "$orig_head"
 620 then
 621         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 622         move_to_original_branch
 623         finish_rebase
 624         exit 0
 625 fi
 626
 627 if test -n "$rebase_root"
 628 then
 629         revisions="$onto..$orig_head"
 630 else
 631         revisions="${restrict_revision-$upstream}..$orig_head"
 632 fi
 633
 634 run_specific_rebase