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