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