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_SPEC="\
   9 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] [<upstream>] [<branch>]
  10 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] --root [<branch>]
  11 git-rebase --continue | --abort | --skip | --edit-todo
  12 --
  13  Available options are
  14 v,verbose!         display a diffstat of what changed upstream
  15 q,quiet!           be quiet. implies --no-stat
  16 autostash!         automatically stash/stash pop before and after
  17 onto=!             rebase onto given branch instead of upstream
  18 p,preserve-merges! try to recreate merges instead of ignoring them
  19 s,strategy=!       use the given merge strategy
  20 no-ff!             cherry-pick all commits, even if unchanged
  21 m,merge!           use merging strategies to rebase
  22 i,interactive!     let the user edit the list of commits to rebase
  23 x,exec=!           add exec lines after each commit of the editable list
  24 k,keep-empty       preserve empty commits during rebase
  25 f,force-rebase!    force rebase even if branch is up to date
  26 X,strategy-option=! pass the argument through to the merge strategy
  27 stat!              display a diffstat of what changed upstream
  28 n,no-stat!         do not show diffstat of what changed upstream
  29 verify             allow pre-rebase hook to run
  30 rerere-autoupdate  allow rerere to update index with resolved conflicts
  31 root!              rebase all reachable commits up to the root(s)
  32 autosquash         move commits that begin with squash!/fixup! under -i
  33 committer-date-is-author-date! passed to 'git am'
  34 ignore-date!       passed to 'git am'
  35 whitespace=!       passed to 'git apply'
  36 ignore-whitespace! passed to 'git apply'
  37 C=!                passed to 'git apply'
  38  Actions:
  39 continue!          continue
  40 abort!             abort and check out the original branch
  41 skip!              skip current patch and continue
  42 edit-todo!         edit the todo list during an interactive rebase
  43 "
  44 . git-sh-setup
  45 . git-sh-i18n
  46 set_reflog_action rebase
  47 require_work_tree_exists
  48 cd_to_toplevel
  49
  50 LF='
  51 '
  52 ok_to_skip_pre_rebase=
  53 resolvemsg="
  54 $(gettext 'When you have resolved this problem, run "git rebase --continue".
  55 If you prefer to skip this patch, run "git rebase --skip" instead.
  56 To check out the original branch and stop rebasing, run "git rebase --abort".')
  57 "
  58 unset onto
  59 cmd=
  60 strategy=
  61 strategy_opts=
  62 do_merge=
  63 merge_dir="$GIT_DIR"/rebase-merge
  64 apply_dir="$GIT_DIR"/rebase-apply
  65 verbose=
  66 diffstat=
  67 test "$(git config --bool rebase.stat)" = true && diffstat=t
  68 autostash="$(git config --bool rebase.autostash || echo false)"
  69 git_am_opt=
  70 rebase_root=
  71 force_rebase=
  72 allow_rerere_autoupdate=
  73 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  74 in_progress=
  75 # One of {am, merge, interactive}
  76 type=
  77 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  78 state_dir=
  79 # One of {'', continue, skip, abort}, as parsed from command line
  80 action=
  81 preserve_merges=
  82 autosquash=
  83 keep_empty=
  84 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  85
  86 read_basic_state () {
  87         test -f "$state_dir/head-name" &&
  88         test -f "$state_dir/onto" &&
  89         head_name=$(cat "$state_dir"/head-name) &&
  90         onto=$(cat "$state_dir"/onto) &&
  91         # We always write to orig-head, but interactive rebase used to write to
  92         # head. Fall back to reading from head to cover for the case that the
  93         # user upgraded git with an ongoing interactive rebase.
  94         if test -f "$state_dir"/orig-head
  95         then
  96                 orig_head=$(cat "$state_dir"/orig-head)
  97         else
  98                 orig_head=$(cat "$state_dir"/head)
  99         fi &&
 100         GIT_QUIET=$(cat "$state_dir"/quiet) &&
 101         test -f "$state_dir"/verbose && verbose=t
 102         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
 103         test -f "$state_dir"/strategy_opts &&
 104                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
 105         test -f "$state_dir"/allow_rerere_autoupdate &&
 106                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
 107 }
 108
 109 write_basic_state () {
 110         echo "$head_name" > "$state_dir"/head-name &&
 111         echo "$onto" > "$state_dir"/onto &&
 112         echo "$orig_head" > "$state_dir"/orig-head &&
 113         echo "$GIT_QUIET" > "$state_dir"/quiet &&
 114         test t = "$verbose" && : > "$state_dir"/verbose
 115         test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
 116         test -n "$strategy_opts" && echo "$strategy_opts" > \
 117                 "$state_dir"/strategy_opts
 118         test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
 119                 "$state_dir"/allow_rerere_autoupdate
 120 }
 121
 122 output () {
 123         case "$verbose" in
 124         '')
 125                 output=$("$@" 2>&1 )
 126                 status=$?
 127                 test $status != 0 && printf "%s\n" "$output"
 128                 return $status
 129                 ;;
 130         *)
 131                 "$@"
 132                 ;;
 133         esac
 134 }
 135
 136 move_to_original_branch () {
 137         case "$head_name" in
 138         refs/*)
 139                 message="rebase finished: $head_name onto $onto"
 140                 git update-ref -m "$message" \
 141                         $head_name $(git rev-parse HEAD) $orig_head &&
 142                 git symbolic-ref \
 143                         -m "rebase finished: returning to $head_name" \
 144                         HEAD $head_name ||
 145                 die "$(gettext "Could not move back to $head_name")"
 146                 ;;
 147         esac
 148 }
 149
 150 finish_rebase () {
 151         if test -f "$state_dir/autostash"
 152         then
 153                 stash_sha1=$(cat "$state_dir/autostash")
 154                 if git stash apply $stash_sha1 2>&1 >/dev/null
 155                 then
 156                         echo "$(gettext 'Applied autostash.')"
 157                 else
 158                         ref_stash=refs/stash &&
 159                         >>"$GIT_DIR/logs/$ref_stash" &&
 160                         git update-ref -m "autostash" $ref_stash $stash_sha1 ||
 161                         die "$(eval_gettext 'Cannot store $stash_sha1')"
 162
 163                         gettext 'Applying autostash resulted in conflicts.
 164 Your changes are safe in the stash.
 165 You can run "git stash pop" or "git stash drop" it at any time.
 166 '
 167                 fi
 168         fi
 169         git gc --auto &&
 170         rm -rf "$state_dir"
 171 }
 172
 173 run_specific_rebase () {
 174         if [ "$interactive_rebase" = implied ]; then
 175                 GIT_EDITOR=:
 176                 export GIT_EDITOR
 177                 autosquash=
 178         fi
 179         . git-rebase--$type
 180         ret=$?
 181         if test $ret -eq 0
 182         then
 183                 finish_rebase
 184         fi
 185         exit $ret
 186 }
 187
 188 run_pre_rebase_hook () {
 189         if test -z "$ok_to_skip_pre_rebase" &&
 190            test -x "$GIT_DIR/hooks/pre-rebase"
 191         then
 192                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
 193                 die "$(gettext "The pre-rebase hook refused to rebase.")"
 194         fi
 195 }
 196
 197 test -f "$apply_dir"/applying &&
 198         die "$(gettext "It looks like git-am is in progress. Cannot rebase.")"
 199
 200 if test -d "$apply_dir"
 201 then
 202         type=am
 203         state_dir="$apply_dir"
 204 elif test -d "$merge_dir"
 205 then
 206         if test -f "$merge_dir"/interactive
 207         then
 208                 type=interactive
 209                 interactive_rebase=explicit
 210         else
 211                 type=merge
 212         fi
 213         state_dir="$merge_dir"
 214 fi
 215 test -n "$type" && in_progress=t
 216
 217 total_argc=$#
 218 while test $# != 0
 219 do
 220         case "$1" in
 221         --no-verify)
 222                 ok_to_skip_pre_rebase=yes
 223                 ;;
 224         --verify)
 225                 ok_to_skip_pre_rebase=
 226                 ;;
 227         --continue|--skip|--abort|--edit-todo)
 228                 test $total_argc -eq 2 || usage
 229                 action=${1##--}
 230                 ;;
 231         --onto)
 232                 test 2 -le "$#" || usage
 233                 onto="$2"
 234                 shift
 235                 ;;
 236         -x)
 237                 test 2 -le "$#" || usage
 238                 cmd="${cmd}exec $2${LF}"
 239                 shift
 240                 ;;
 241         -i)
 242                 interactive_rebase=explicit
 243                 ;;
 244         -k)
 245                 keep_empty=yes
 246                 ;;
 247         -p)
 248                 preserve_merges=t
 249                 test -z "$interactive_rebase" && interactive_rebase=implied
 250                 ;;
 251         --autosquash)
 252                 autosquash=t
 253                 ;;
 254         --no-autosquash)
 255                 autosquash=
 256                 ;;
 257         -M|-m)
 258                 do_merge=t
 259                 ;;
 260         -X)
 261                 shift
 262                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$1")"
 263                 do_merge=t
 264                 test -z "$strategy" && strategy=recursive
 265                 ;;
 266         -s)
 267                 shift
 268                 strategy="$1"
 269                 do_merge=t
 270                 ;;
 271         -n)
 272                 diffstat=
 273                 ;;
 274         --stat)
 275                 diffstat=t
 276                 ;;
 277         --autostash)
 278                 autostash=true
 279                 ;;
 280         -v)
 281                 verbose=t
 282                 diffstat=t
 283                 GIT_QUIET=
 284                 ;;
 285         -q)
 286                 GIT_QUIET=t
 287                 git_am_opt="$git_am_opt -q"
 288                 verbose=
 289                 diffstat=
 290                 ;;
 291         --whitespace)
 292                 shift
 293                 git_am_opt="$git_am_opt --whitespace=$1"
 294                 case "$1" in
 295                 fix|strip)
 296                         force_rebase=t
 297                         ;;
 298                 esac
 299                 ;;
 300         --ignore-whitespace)
 301                 git_am_opt="$git_am_opt $1"
 302                 ;;
 303         --committer-date-is-author-date|--ignore-date)
 304                 git_am_opt="$git_am_opt $1"
 305                 force_rebase=t
 306                 ;;
 307         -C)
 308                 shift
 309                 git_am_opt="$git_am_opt -C$1"
 310                 ;;
 311         --root)
 312                 rebase_root=t
 313                 ;;
 314         -f|--no-ff)
 315                 force_rebase=t
 316                 ;;
 317         --rerere-autoupdate|--no-rerere-autoupdate)
 318                 allow_rerere_autoupdate="$1"
 319                 ;;
 320         --)
 321                 shift
 322                 break
 323                 ;;
 324         esac
 325         shift
 326 done
 327 test $# -gt 2 && usage
 328
 329 if test -n "$cmd" &&
 330    test "$interactive_rebase" != explicit
 331 then
 332         die "$(gettext "The --exec option must be used with the --interactive option")"
 333 fi
 334
 335 if test -n "$action"
 336 then
 337         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 338         # Only interactive rebase uses detailed reflog messages
 339         if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
 340         then
 341                 GIT_REFLOG_ACTION="rebase -i ($action)"
 342                 export GIT_REFLOG_ACTION
 343         fi
 344 fi
 345
 346 if test "$action" = "edit-todo" && test "$type" != "interactive"
 347 then
 348         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 349 fi
 350
 351 case "$action" in
 352 continue)
 353         # Sanity check
 354         git rev-parse --verify HEAD >/dev/null ||
 355                 die "$(gettext "Cannot read HEAD")"
 356         git update-index --ignore-submodules --refresh &&
 357         git diff-files --quiet --ignore-submodules || {
 358                 echo "$(gettext "You must edit all merge conflicts and then
 359 mark them as resolved using git add")"
 360                 exit 1
 361         }
 362         read_basic_state
 363         run_specific_rebase
 364         ;;
 365 skip)
 366         output git reset --hard HEAD || exit $?
 367         read_basic_state
 368         run_specific_rebase
 369         ;;
 370 abort)
 371         git rerere clear
 372         read_basic_state
 373         case "$head_name" in
 374         refs/*)
 375                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 376                 die "$(eval_gettext "Could not move back to \$head_name")"
 377                 ;;
 378         esac
 379         output git reset --hard $orig_head
 380         finish_rebase
 381         exit
 382         ;;
 383 edit-todo)
 384         run_specific_rebase
 385         ;;
 386 esac
 387
 388 # Make sure no rebase is in progress
 389 if test -n "$in_progress"
 390 then
 391         state_dir_base=${state_dir##*/}
 392         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 393         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 394         die "
 395 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 396 I wonder if you are in the middle of another rebase.  If that is the
 397 case, please try
 398         $cmd_live_rebase
 399 If that is not the case, please
 400         $cmd_clear_stale_rebase
 401 and run me again.  I am stopping in case you still have something
 402 valuable there.')"
 403 fi
 404
 405 if test -n "$rebase_root" && test -z "$onto"
 406 then
 407         test -z "$interactive_rebase" && interactive_rebase=implied
 408 fi
 409
 410 if test -n "$interactive_rebase"
 411 then
 412         type=interactive
 413         state_dir="$merge_dir"
 414 elif test -n "$do_merge"
 415 then
 416         type=merge
 417         state_dir="$merge_dir"
 418 else
 419         type=am
 420         state_dir="$apply_dir"
 421 fi
 422
 423 if test -z "$rebase_root"
 424 then
 425         case "$#" in
 426         0)
 427                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
 428                         --verify -q @{upstream} 2>/dev/null)
 429                 then
 430                         . git-parse-remote
 431                         error_on_missing_default_upstream "rebase" "rebase" \
 432                                 "against" "git rebase <branch>"
 433                 fi
 434                 ;;
 435         *)      upstream_name="$1"
 436                 shift
 437                 ;;
 438         esac
 439         upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 440         die "$(eval_gettext "invalid upstream \$upstream_name")"
 441         upstream_arg="$upstream_name"
 442 else
 443         if test -z "$onto"
 444         then
 445                 empty_tree=`git hash-object -t tree /dev/null`
 446                 onto=`git commit-tree $empty_tree </dev/null`
 447                 squash_onto="$onto"
 448         fi
 449         unset upstream_name
 450         unset upstream
 451         test $# -gt 1 && usage
 452         upstream_arg=--root
 453 fi
 454
 455 # Make sure the branch to rebase onto is valid.
 456 onto_name=${onto-"$upstream_name"}
 457 case "$onto_name" in
 458 *...*)
 459         if      left=${onto_name%...*} right=${onto_name#*...} &&
 460                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 461         then
 462                 case "$onto" in
 463                 ?*"$LF"?*)
 464                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 465                         ;;
 466                 '')
 467                         die "$(eval_gettext "\$onto_name: there is no merge base")"
 468                         ;;
 469                 esac
 470         else
 471                 die "$(eval_gettext "\$onto_name: there is no merge base")"
 472         fi
 473         ;;
 474 *)
 475         onto=$(git rev-parse --verify "${onto_name}^0") ||
 476         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 477         ;;
 478 esac
 479
 480 # If the branch to rebase is given, that is the branch we will rebase
 481 # $branch_name -- branch being rebased, or HEAD (already detached)
 482 # $orig_head -- commit object name of tip of the branch before rebasing
 483 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 484 switch_to=
 485 case "$#" in
 486 1)
 487         # Is it "rebase other $branchname" or "rebase other $commit"?
 488         branch_name="$1"
 489         switch_to="$1"
 490
 491         if git show-ref --verify --quiet -- "refs/heads/$1" &&
 492            orig_head=$(git rev-parse -q --verify "refs/heads/$1")
 493         then
 494                 head_name="refs/heads/$1"
 495         elif orig_head=$(git rev-parse -q --verify "$1")
 496         then
 497                 head_name="detached HEAD"
 498         else
 499                 die "$(eval_gettext "fatal: no such branch: \$branch_name")"
 500         fi
 501         ;;
 502 0)
 503         # Do not need to switch branches, we are already on it.
 504         if branch_name=`git symbolic-ref -q HEAD`
 505         then
 506                 head_name=$branch_name
 507                 branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 508         else
 509                 head_name="detached HEAD"
 510                 branch_name=HEAD ;# detached
 511         fi
 512         orig_head=$(git rev-parse --verify HEAD) || exit
 513         ;;
 514 *)
 515         die "BUG: unexpected number of arguments left to parse"
 516         ;;
 517 esac
 518
 519 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 520 then
 521         stash_sha1=$(git stash create "autostash") ||
 522         die "$(gettext 'Cannot autostash')"
 523
 524         mkdir -p "$state_dir" &&
 525         echo $stash_sha1 >"$state_dir/autostash" &&
 526         stash_abbrev=$(git rev-parse --short $stash_sha1) &&
 527         echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
 528         git reset --hard
 529 fi
 530
 531 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 532
 533 # Now we are rebasing commits $upstream..$orig_head (or with --root,
 534 # everything leading up to $orig_head) on top of $onto
 535
 536 # Check if we are already based on $onto with linear history,
 537 # but this should be done only when upstream and onto are the same
 538 # and if this is not an interactive rebase.
 539 mb=$(git merge-base "$onto" "$orig_head")
 540 if test "$type" != interactive && test "$upstream" = "$onto" &&
 541         test "$mb" = "$onto" &&
 542         # linear history?
 543         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 544 then
 545         if test -z "$force_rebase"
 546         then
 547                 # Lazily switch to the target branch if needed...
 548                 test -z "$switch_to" || git checkout "$switch_to" --
 549                 say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 550                 finish_rebase
 551                 exit 0
 552         else
 553                 say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 554         fi
 555 fi
 556
 557 # If a hook exists, give it a chance to interrupt
 558 run_pre_rebase_hook "$upstream_arg" "$@"
 559
 560 if test -n "$diffstat"
 561 then
 562         if test -n "$verbose"
 563         then
 564                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 565         fi
 566         # We want color (if set), but no pager
 567         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 568 fi
 569
 570 test "$type" = interactive && run_specific_rebase
 571
 572 # Detach HEAD and reset the tree
 573 say "$(gettext "First, rewinding head to replay your work on top of it...")"
 574 git checkout -q "$onto^0" || die "could not detach HEAD"
 575 git update-ref ORIG_HEAD $orig_head
 576
 577 # If the $onto is a proper descendant of the tip of the branch, then
 578 # we just fast-forwarded.
 579 if test "$mb" = "$orig_head"
 580 then
 581         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 582         move_to_original_branch
 583         finish_rebase
 584         exit 0
 585 fi
 586
 587 if test -n "$rebase_root"
 588 then
 589         revisions="$onto..$orig_head"
 590 else
 591         revisions="$upstream..$orig_head"
 592 fi
 593
 594 run_specific_rebase