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