git-legacy-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 r,rebase-merges?   try to rebase merges instead of skipping them
  21 p,preserve-merges! try to recreate merges instead of ignoring them
  22 s,strategy=!       use the given merge strategy
  23 X,strategy-option=! pass the argument through to the merge strategy
  24 no-ff!             cherry-pick all commits, even if unchanged
  25 f,force-rebase!    cherry-pick all commits, even if unchanged
  26 m,merge!           use merging strategies to rebase
  27 i,interactive!     let the user edit the list of commits to rebase
  28 x,exec=!           add exec lines after each commit of the editable list
  29 k,keep-empty       preserve empty commits during rebase
  30 allow-empty-message allow rebasing commits with empty messages
  31 stat!              display a diffstat of what changed upstream
  32 n,no-stat!         do not show diffstat of what changed upstream
  33 verify             allow pre-rebase hook to run
  34 rerere-autoupdate  allow rerere to update index with resolved conflicts
  35 root!              rebase all reachable commits up to the root(s)
  36 autosquash         move commits that begin with squash!/fixup! under -i
  37 signoff            add a Signed-off-by: line to each commit
  38 committer-date-is-author-date! passed to 'git am'
  39 ignore-date!       passed to 'git am'
  40 whitespace=!       passed to 'git apply'
  41 ignore-whitespace! passed to 'git apply'
  42 C=!                passed to 'git apply'
  43 S,gpg-sign?        GPG-sign commits
  44  Actions:
  45 continue!          continue
  46 abort!             abort and check out the original branch
  47 skip!              skip current patch and continue
  48 edit-todo!         edit the todo list during an interactive rebase
  49 quit!              abort but keep HEAD where it is
  50 show-current-patch! show the patch file being applied or merged
  51 "
  52 . git-sh-setup
  53 set_reflog_action rebase
  54 require_work_tree_exists
  55 cd_to_toplevel
  56
  57 LF='
  58 '
  59 ok_to_skip_pre_rebase=
  60
  61 squash_onto=
  62 unset onto
  63 unset restrict_revision
  64 cmd=
  65 strategy=
  66 strategy_opts=
  67 do_merge=
  68 merge_dir="$GIT_DIR"/rebase-merge
  69 apply_dir="$GIT_DIR"/rebase-apply
  70 verbose=
  71 diffstat=
  72 test "$(git config --bool rebase.stat)" = true && diffstat=t
  73 autostash="$(git config --bool rebase.autostash || echo false)"
  74 fork_point=auto
  75 git_am_opt=
  76 git_format_patch_opt=
  77 rebase_root=
  78 force_rebase=
  79 allow_rerere_autoupdate=
  80 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  81 in_progress=
  82 # One of {am, merge, interactive}
  83 type=
  84 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  85 state_dir=
  86 # One of {'', continue, skip, abort}, as parsed from command line
  87 action=
  88 rebase_merges=
  89 rebase_cousins=
  90 preserve_merges=
  91 autosquash=
  92 keep_empty=
  93 allow_empty_message=--allow-empty-message
  94 signoff=
  95 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  96 case "$(git config --bool commit.gpgsign)" in
  97 true)   gpg_sign_opt=-S ;;
  98 *)      gpg_sign_opt= ;;
  99 esac
 100 . git-rebase--common
 101
 102 read_basic_state () {
 103         test -f "$state_dir/head-name" &&
 104         test -f "$state_dir/onto" &&
 105         head_name=$(cat "$state_dir"/head-name) &&
 106         onto=$(cat "$state_dir"/onto) &&
 107         # We always write to orig-head, but interactive rebase used to write to
 108         # head. Fall back to reading from head to cover for the case that the
 109         # user upgraded git with an ongoing interactive rebase.
 110         if test -f "$state_dir"/orig-head
 111         then
 112                 orig_head=$(cat "$state_dir"/orig-head)
 113         else
 114                 orig_head=$(cat "$state_dir"/head)
 115         fi &&
 116         GIT_QUIET=$(cat "$state_dir"/quiet) &&
 117         test -f "$state_dir"/verbose && verbose=t
 118         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
 119         test -f "$state_dir"/strategy_opts &&
 120                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
 121         test -f "$state_dir"/allow_rerere_autoupdate &&
 122                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
 123         test -f "$state_dir"/gpg_sign_opt &&
 124                 gpg_sign_opt="$(cat "$state_dir"/gpg_sign_opt)"
 125         test -f "$state_dir"/signoff && {
 126                 signoff="$(cat "$state_dir"/signoff)"
 127                 force_rebase=t
 128         }
 129 }
 130
 131 finish_rebase () {
 132         rm -f "$(git rev-parse --git-path REBASE_HEAD)"
 133         apply_autostash &&
 134         { git gc --auto || true; } &&
 135         rm -rf "$state_dir"
 136 }
 137
 138 run_interactive () {
 139         GIT_CHERRY_PICK_HELP="$resolvemsg"
 140         export GIT_CHERRY_PICK_HELP
 141
 142         test -n "$keep_empty" && keep_empty="--keep-empty"
 143         test -n "$rebase_merges" && rebase_merges="--rebase-merges"
 144         test -n "$rebase_cousins" && rebase_cousins="--rebase-cousins"
 145         test -n "$autosquash" && autosquash="--autosquash"
 146         test -n "$verbose" && verbose="--verbose"
 147         test -n "$force_rebase" && force_rebase="--no-ff"
 148         test -n "$restrict_revision" && \
 149                 restrict_revision="--restrict-revision=^$restrict_revision"
 150         test -n "$upstream" && upstream="--upstream=$upstream"
 151         test -n "$onto" && onto="--onto=$onto"
 152         test -n "$squash_onto" && squash_onto="--squash-onto=$squash_onto"
 153         test -n "$onto_name" && onto_name="--onto-name=$onto_name"
 154         test -n "$head_name" && head_name="--head-name=$head_name"
 155         test -n "$strategy" && strategy="--strategy=$strategy"
 156         test -n "$strategy_opts" && strategy_opts="--strategy-opts=$strategy_opts"
 157         test -n "$switch_to" && switch_to="--switch-to=$switch_to"
 158         test -n "$cmd" && cmd="--cmd=$cmd"
 159         test -n "$action" && action="--$action"
 160
 161         exec git rebase--interactive "$action" "$keep_empty" "$rebase_merges" "$rebase_cousins" \
 162                 "$upstream" "$onto" "$squash_onto" "$restrict_revision" \
 163                 "$allow_empty_message" "$autosquash" "$verbose" \
 164                 "$force_rebase" "$onto_name" "$head_name" "$strategy" \
 165                 "$strategy_opts" "$cmd" "$switch_to" \
 166                 "$allow_rerere_autoupdate" "$gpg_sign_opt" "$signoff"
 167 }
 168
 169 run_specific_rebase () {
 170         if [ "$interactive_rebase" = implied ]; then
 171                 GIT_EDITOR=:
 172                 export GIT_EDITOR
 173                 autosquash=
 174         fi
 175
 176         if test -n "$interactive_rebase" -a -z "$preserve_merges"
 177         then
 178                 run_interactive
 179         else
 180                 . git-rebase--$type
 181
 182                 if test -z "$preserve_merges"
 183                 then
 184                         git_rebase__$type
 185                 else
 186                         git_rebase__preserve_merges
 187                 fi
 188         fi
 189
 190         ret=$?
 191         if test $ret -eq 0
 192         then
 193                 finish_rebase
 194         elif test $ret -eq 2 # special exit status for rebase -p
 195         then
 196                 apply_autostash &&
 197                 rm -rf "$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 "$(git rev-parse --git-path hooks/pre-rebase)"
 206         then
 207                 "$(git rev-parse --git-path 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 -d "$merge_dir"/rewritten
 222         then
 223                 type=preserve-merges
 224                 interactive_rebase=explicit
 225                 preserve_merges=t
 226         elif test -f "$merge_dir"/interactive
 227         then
 228                 type=interactive
 229                 interactive_rebase=explicit
 230         else
 231                 type=merge
 232         fi
 233         state_dir="$merge_dir"
 234 fi
 235 test -n "$type" && in_progress=t
 236
 237 total_argc=$#
 238 while test $# != 0
 239 do
 240         case "$1" in
 241         --no-verify)
 242                 ok_to_skip_pre_rebase=yes
 243                 ;;
 244         --verify)
 245                 ok_to_skip_pre_rebase=
 246                 ;;
 247         --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
 248                 test $total_argc -eq 2 || usage
 249                 action=${1##--}
 250                 ;;
 251         --onto=*)
 252                 onto="${1#--onto=}"
 253                 ;;
 254         --exec=*)
 255                 cmd="${cmd}exec ${1#--exec=}${LF}"
 256                 test -z "$interactive_rebase" && interactive_rebase=implied
 257                 ;;
 258         --interactive)
 259                 interactive_rebase=explicit
 260                 ;;
 261         --keep-empty)
 262                 keep_empty=yes
 263                 ;;
 264         --allow-empty-message)
 265                 allow_empty_message=--allow-empty-message
 266                 ;;
 267         --no-keep-empty)
 268                 keep_empty=
 269                 ;;
 270         --rebase-merges)
 271                 rebase_merges=t
 272                 test -z "$interactive_rebase" && interactive_rebase=implied
 273                 ;;
 274         --rebase-merges=*)
 275                 rebase_merges=t
 276                 case "${1#*=}" in
 277                 rebase-cousins) rebase_cousins=t;;
 278                 no-rebase-cousins) rebase_cousins=;;
 279                 *) die "Unknown mode: $1";;
 280                 esac
 281                 test -z "$interactive_rebase" && interactive_rebase=implied
 282                 ;;
 283         --preserve-merges)
 284                 preserve_merges=t
 285                 test -z "$interactive_rebase" && interactive_rebase=implied
 286                 ;;
 287         --autosquash)
 288                 autosquash=t
 289                 ;;
 290         --no-autosquash)
 291                 autosquash=
 292                 ;;
 293         --fork-point)
 294                 fork_point=t
 295                 ;;
 296         --no-fork-point)
 297                 fork_point=
 298                 ;;
 299         --merge)
 300                 do_merge=t
 301                 ;;
 302         --strategy-option=*)
 303                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}" | sed -e s/^.//)"
 304                 do_merge=t
 305                 test -z "$strategy" && strategy=recursive
 306                 ;;
 307         --strategy=*)
 308                 strategy="${1#--strategy=}"
 309                 do_merge=t
 310                 ;;
 311         --no-stat)
 312                 diffstat=
 313                 ;;
 314         --stat)
 315                 diffstat=t
 316                 ;;
 317         --autostash)
 318                 autostash=true
 319                 ;;
 320         --no-autostash)
 321                 autostash=false
 322                 ;;
 323         --verbose)
 324                 verbose=t
 325                 diffstat=t
 326                 GIT_QUIET=
 327                 ;;
 328         --quiet)
 329                 GIT_QUIET=t
 330                 git_am_opt="$git_am_opt -q"
 331                 verbose=
 332                 diffstat=
 333                 ;;
 334         --whitespace=*)
 335                 git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
 336                 case "${1#--whitespace=}" in
 337                 fix|strip)
 338                         force_rebase=t
 339                         ;;
 340                 esac
 341                 ;;
 342         --ignore-whitespace)
 343                 git_am_opt="$git_am_opt $1"
 344                 ;;
 345         --signoff)
 346                 signoff=--signoff
 347                 ;;
 348         --no-signoff)
 349                 signoff=
 350                 ;;
 351         --committer-date-is-author-date|--ignore-date)
 352                 git_am_opt="$git_am_opt $1"
 353                 force_rebase=t
 354                 ;;
 355         -C*)
 356                 git_am_opt="$git_am_opt $1"
 357                 ;;
 358         --root)
 359                 rebase_root=t
 360                 ;;
 361         --force-rebase|--no-ff)
 362                 force_rebase=t
 363                 ;;
 364         --rerere-autoupdate|--no-rerere-autoupdate)
 365                 allow_rerere_autoupdate="$1"
 366                 ;;
 367         --gpg-sign)
 368                 gpg_sign_opt=-S
 369                 ;;
 370         --gpg-sign=*)
 371                 gpg_sign_opt="-S${1#--gpg-sign=}"
 372                 ;;
 373         --)
 374                 shift
 375                 break
 376                 ;;
 377         *)
 378                 usage
 379                 ;;
 380         esac
 381         shift
 382 done
 383 test $# -gt 2 && usage
 384
 385 if test -n "$action"
 386 then
 387         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 388         # Only interactive rebase uses detailed reflog messages
 389         if test -n "$interactive_rebase" && test "$GIT_REFLOG_ACTION" = rebase
 390         then
 391                 GIT_REFLOG_ACTION="rebase -i ($action)"
 392                 export GIT_REFLOG_ACTION
 393         fi
 394 fi
 395
 396 if test "$action" = "edit-todo" && test -z "$interactive_rebase"
 397 then
 398         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
 399 fi
 400
 401 case "$action" in
 402 continue)
 403         # Sanity check
 404         git rev-parse --verify HEAD >/dev/null ||
 405                 die "$(gettext "Cannot read HEAD")"
 406         git update-index --ignore-submodules --refresh &&
 407         git diff-files --quiet --ignore-submodules || {
 408                 echo "$(gettext "You must edit all merge conflicts and then
 409 mark them as resolved using git add")"
 410                 exit 1
 411         }
 412         read_basic_state
 413         run_specific_rebase
 414         ;;
 415 skip)
 416         output git reset --hard HEAD || exit $?
 417         read_basic_state
 418         run_specific_rebase
 419         ;;
 420 abort)
 421         git rerere clear
 422         read_basic_state
 423         case "$head_name" in
 424         refs/*)
 425                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 426                 die "$(eval_gettext "Could not move back to \$head_name")"
 427                 ;;
 428         esac
 429         output git reset --hard $orig_head
 430         finish_rebase
 431         exit
 432         ;;
 433 quit)
 434         exec rm -rf "$state_dir"
 435         ;;
 436 edit-todo)
 437         run_specific_rebase
 438         ;;
 439 show-current-patch)
 440         run_specific_rebase
 441         die "BUG: run_specific_rebase is not supposed to return here"
 442         ;;
 443 esac
 444
 445 # Make sure no rebase is in progress
 446 if test -n "$in_progress"
 447 then
 448         state_dir_base=${state_dir##*/}
 449         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 450         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 451         die "
 452 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 453 I wonder if you are in the middle of another rebase.  If that is the
 454 case, please try
 455         $cmd_live_rebase
 456 If that is not the case, please
 457         $cmd_clear_stale_rebase
 458 and run me again.  I am stopping in case you still have something
 459 valuable there.')"
 460 fi
 461
 462 if test -n "$rebase_root" && test -z "$onto"
 463 then
 464         test -z "$interactive_rebase" && interactive_rebase=implied
 465 fi
 466
 467 if test -n "$keep_empty"
 468 then
 469         test -z "$interactive_rebase" && interactive_rebase=implied
 470 fi
 471
 472 if test -n "$interactive_rebase"
 473 then
 474         if test -z "$preserve_merges"
 475         then
 476                 type=interactive
 477         else
 478                 type=preserve-merges
 479         fi
 480
 481         state_dir="$merge_dir"
 482 elif test -n "$do_merge"
 483 then
 484         type=merge
 485         state_dir="$merge_dir"
 486 else
 487         type=am
 488         state_dir="$apply_dir"
 489 fi
 490
 491 if test -t 2 && test -z "$GIT_QUIET"
 492 then
 493         git_format_patch_opt="$git_format_patch_opt --progress"
 494 fi
 495
 496 if test -n "$git_am_opt"; then
 497         incompatible_opts=$(echo " $git_am_opt " | \
 498                             sed -e 's/ -q / /g' -e 's/^ \(.*\) $/\1/')
 499         if test -n "$interactive_rebase"
 500         then
 501                 if test -n "$incompatible_opts"
 502                 then
 503                         die "$(gettext "error: cannot combine interactive options (--interactive, --exec, --rebase-merges, --preserve-merges, --keep-empty, --root + --onto) with am options ($incompatible_opts)")"
 504                 fi
 505         fi
 506         if test -n "$do_merge"; then
 507                 if test -n "$incompatible_opts"
 508                 then
 509                         die "$(gettext "error: cannot combine merge options (--merge, --strategy, --strategy-option) with am options ($incompatible_opts)")"
 510                 fi
 511         fi
 512 fi
 513
 514 if test -n "$signoff"
 515 then
 516         test -n "$preserve_merges" &&
 517                 die "$(gettext "error: cannot combine '--signoff' with '--preserve-merges'")"
 518         git_am_opt="$git_am_opt $signoff"
 519         force_rebase=t
 520 fi
 521
 522 if test -n "$preserve_merges"
 523 then
 524         # Note: incompatibility with --signoff handled in signoff block above
 525         # Note: incompatibility with --interactive is just a strong warning;
 526         #       git-rebase.txt caveats with "unless you know what you are doing"
 527         test -n "$rebase_merges" &&
 528                 die "$(gettext "error: cannot combine '--preserve-merges' with '--rebase-merges'")"
 529 fi
 530
 531 if test -n "$rebase_merges"
 532 then
 533         test -n "$strategy_opts" &&
 534                 die "$(gettext "error: cannot combine '--rebase-merges' with '--strategy-option'")"
 535         test -n "$strategy" &&
 536                 die "$(gettext "error: cannot combine '--rebase-merges' with '--strategy'")"
 537 fi
 538
 539 if test -z "$rebase_root"
 540 then
 541         case "$#" in
 542         0)
 543                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
 544                         --verify -q @{upstream} 2>/dev/null)
 545                 then
 546                         . git-parse-remote
 547                         error_on_missing_default_upstream "rebase" "rebase" \
 548                                 "against" "git rebase $(gettext '<branch>')"
 549                 fi
 550
 551                 test "$fork_point" = auto && fork_point=t
 552                 ;;
 553         *)      upstream_name="$1"
 554                 if test "$upstream_name" = "-"
 555                 then
 556                         upstream_name="@{-1}"
 557                 fi
 558                 shift
 559                 ;;
 560         esac
 561         upstream=$(peel_committish "${upstream_name}") ||
 562         die "$(eval_gettext "invalid upstream '\$upstream_name'")"
 563         upstream_arg="$upstream_name"
 564 else
 565         if test -z "$onto"
 566         then
 567                 empty_tree=$(git hash-object -t tree /dev/null)
 568                 onto=$(git commit-tree $empty_tree </dev/null)
 569                 squash_onto="$onto"
 570         fi
 571         unset upstream_name
 572         unset upstream
 573         test $# -gt 1 && usage
 574         upstream_arg=--root
 575 fi
 576
 577 # Make sure the branch to rebase onto is valid.
 578 onto_name=${onto-"$upstream_name"}
 579 case "$onto_name" in
 580 *...*)
 581         if      left=${onto_name%...*} right=${onto_name#*...} &&
 582                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 583         then
 584                 case "$onto" in
 585                 ?*"$LF"?*)
 586                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 587                         ;;
 588                 '')
 589                         die "$(eval_gettext "\$onto_name: there is no merge base")"
 590                         ;;
 591                 esac
 592         else
 593                 die "$(eval_gettext "\$onto_name: there is no merge base")"
 594         fi
 595         ;;
 596 *)
 597         onto=$(peel_committish "$onto_name") ||
 598         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 599         ;;
 600 esac
 601
 602 # If the branch to rebase is given, that is the branch we will rebase
 603 # $branch_name -- branch/commit being rebased, or HEAD (already detached)
 604 # $orig_head -- commit object name of tip of the branch before rebasing
 605 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 606 switch_to=
 607 case "$#" in
 608 1)
 609         # Is it "rebase other $branchname" or "rebase other $commit"?
 610         branch_name="$1"
 611         switch_to="$1"
 612
 613         # Is it a local branch?
 614         if git show-ref --verify --quiet -- "refs/heads/$branch_name" &&
 615            orig_head=$(git rev-parse -q --verify "refs/heads/$branch_name")
 616         then
 617                 head_name="refs/heads/$branch_name"
 618         # If not is it a valid ref (branch or commit)?
 619         elif orig_head=$(git rev-parse -q --verify "$branch_name")
 620         then
 621                 head_name="detached HEAD"
 622
 623         else
 624                 die "$(eval_gettext "fatal: no such branch/commit '\$branch_name'")"
 625         fi
 626         ;;
 627 0)
 628         # Do not need to switch branches, we are already on it.
 629         if branch_name=$(git symbolic-ref -q HEAD)
 630         then
 631                 head_name=$branch_name
 632                 branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
 633         else
 634                 head_name="detached HEAD"
 635                 branch_name=HEAD
 636         fi
 637         orig_head=$(git rev-parse --verify HEAD) || exit
 638         ;;
 639 *)
 640         die "BUG: unexpected number of arguments left to parse"
 641         ;;
 642 esac
 643
 644 if test "$fork_point" = t
 645 then
 646         new_upstream=$(git merge-base --fork-point "$upstream_name" \
 647                         "${switch_to:-HEAD}")
 648         if test -n "$new_upstream"
 649         then
 650                 restrict_revision=$new_upstream
 651         fi
 652 fi
 653
 654 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
 655 then
 656         stash_sha1=$(git stash create "autostash") ||
 657         die "$(gettext 'Cannot autostash')"
 658
 659         mkdir -p "$state_dir" &&
 660         echo $stash_sha1 >"$state_dir/autostash" &&
 661         stash_abbrev=$(git rev-parse --short $stash_sha1) &&
 662         echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
 663         git reset --hard
 664 fi
 665
 666 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 667
 668 # Now we are rebasing commits $upstream..$orig_head (or with --root,
 669 # everything leading up to $orig_head) on top of $onto
 670
 671 # Check if we are already based on $onto with linear history,
 672 # but this should be done only when upstream and onto are the same
 673 # and if this is not an interactive rebase.
 674 mb=$(git merge-base "$onto" "$orig_head")
 675 if test -z "$interactive_rebase" && test "$upstream" = "$onto" &&
 676         test "$mb" = "$onto" && test -z "$restrict_revision" &&
 677         # linear history?
 678         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 679 then
 680         if test -z "$force_rebase"
 681         then
 682                 # Lazily switch to the target branch if needed...
 683                 test -z "$switch_to" ||
 684                 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
 685                         git checkout -q "$switch_to" --
 686                 if test "$branch_name" = "HEAD" &&
 687                          ! git symbolic-ref -q HEAD
 688                 then
 689                         say "$(eval_gettext "HEAD is up to date.")"
 690                 else
 691                         say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 692                 fi
 693                 finish_rebase
 694                 exit 0
 695         else
 696                 if test "$branch_name" = "HEAD" &&
 697                          ! git symbolic-ref -q HEAD
 698                 then
 699                         say "$(eval_gettext "HEAD is up to date, rebase forced.")"
 700                 else
 701                         say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 702                 fi
 703         fi
 704 fi
 705
 706 # If a hook exists, give it a chance to interrupt
 707 run_pre_rebase_hook "$upstream_arg" "$@"
 708
 709 if test -n "$diffstat"
 710 then
 711         if test -n "$verbose"
 712         then
 713                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 714         fi
 715         # We want color (if set), but no pager
 716         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 717 fi
 718
 719 test -n "$interactive_rebase" && run_specific_rebase
 720
 721 # Detach HEAD and reset the tree
 722 say "$(gettext "First, rewinding head to replay your work on top of it...")"
 723
 724 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
 725         git checkout -q "$onto^0" || die "could not detach HEAD"
 726 git update-ref ORIG_HEAD $orig_head
 727
 728 # If the $onto is a proper descendant of the tip of the branch, then
 729 # we just fast-forwarded.
 730 if test "$mb" = "$orig_head"
 731 then
 732         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 733         move_to_original_branch
 734         finish_rebase
 735         exit 0
 736 fi
 737
 738 if test -n "$rebase_root"
 739 then
 740         revisions="$onto..$orig_head"
 741 else
 742         revisions="${restrict_revision-$upstream}..$orig_head"
 743 fi
 744
 745 run_specific_rebase