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