git-rebase.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano.
   4 #
   5
   6 USAGE='[--interactive | -i] [-v] [--force-rebase | -f] [--no-ff] [--onto <newbase>] (<upstream>|--root) [<branch>] [--quiet | -q]'
   7 LONG_USAGE='git-rebase replaces <branch> with a new branch of the
   8 same name.  When the --onto option is provided the new branch starts
   9 out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
  10 It then attempts to create a new commit for each commit from the original
  11 <branch> that does not exist in the <upstream> branch.
  12
  13 It is possible that a merge failure will prevent this process from being
  14 completely automatic.  You will have to resolve any such merge failure
  15 and run git rebase --continue.  Another option is to bypass the commit
  16 that caused the merge failure with git rebase --skip.  To restore the
  17 original <branch> and remove the .git/rebase-apply working files, use the
  18 command git rebase --abort instead.
  19
  20 Note that if <branch> is not specified on the command line, the
  21 currently checked out branch is used.
  22
  23 Example:       git-rebase master~1 topic
  24
  25         A---B---C topic                   A'\''--B'\''--C'\'' topic
  26        /                   -->           /
  27   D---E---F---G master          D---E---F---G master
  28 '
  29
  30 SUBDIRECTORY_OK=Yes
  31 OPTIONS_SPEC=
  32 . git-sh-setup
  33 set_reflog_action rebase
  34 require_work_tree
  35 cd_to_toplevel
  36
  37 LF='
  38 '
  39 OK_TO_SKIP_PRE_REBASE=
  40 RESOLVEMSG="
  41 When you have resolved this problem run \"git rebase --continue\".
  42 If you would prefer to skip this patch, instead run \"git rebase --skip\".
  43 To restore the original branch and stop rebasing run \"git rebase --abort\".
  44 "
  45 unset newbase
  46 strategy=recursive
  47 strategy_opts=
  48 do_merge=
  49 dotest="$GIT_DIR"/rebase-merge
  50 prec=4
  51 verbose=
  52 diffstat=
  53 test "$(git config --bool rebase.stat)" = true && diffstat=t
  54 git_am_opt=
  55 rebase_root=
  56 force_rebase=
  57 allow_rerere_autoupdate=
  58
  59 continue_merge () {
  60         test -n "$prev_head" || die "prev_head must be defined"
  61         test -d "$dotest" || die "$dotest directory does not exist"
  62
  63         unmerged=$(git ls-files -u)
  64         if test -n "$unmerged"
  65         then
  66                 echo "You still have unmerged paths in your index"
  67                 echo "did you forget to use git add?"
  68                 die "$RESOLVEMSG"
  69         fi
  70
  71         cmt=`cat "$dotest/current"`
  72         if ! git diff-index --quiet --ignore-submodules HEAD --
  73         then
  74                 if ! git commit --no-verify -C "$cmt"
  75                 then
  76                         echo "Commit failed, please do not call \"git commit\""
  77                         echo "directly, but instead do one of the following: "
  78                         die "$RESOLVEMSG"
  79                 fi
  80                 if test -z "$GIT_QUIET"
  81                 then
  82                         printf "Committed: %0${prec}d " $msgnum
  83                 fi
  84                 echo "$cmt $(git rev-parse HEAD^0)" >> "$dotest/rewritten"
  85         else
  86                 if test -z "$GIT_QUIET"
  87                 then
  88                         printf "Already applied: %0${prec}d " $msgnum
  89                 fi
  90         fi
  91         test -z "$GIT_QUIET" &&
  92         GIT_PAGER='' git log --format=%s -1 "$cmt"
  93
  94         prev_head=`git rev-parse HEAD^0`
  95         # save the resulting commit so we can read-tree on it later
  96         echo "$prev_head" > "$dotest/prev_head"
  97
  98         # onto the next patch:
  99         msgnum=$(($msgnum + 1))
 100         echo "$msgnum" >"$dotest/msgnum"
 101 }
 102
 103 call_merge () {
 104         cmt="$(cat "$dotest/cmt.$1")"
 105         echo "$cmt" > "$dotest/current"
 106         hd=$(git rev-parse --verify HEAD)
 107         cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
 108         msgnum=$(cat "$dotest/msgnum")
 109         end=$(cat "$dotest/end")
 110         eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
 111         eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
 112         export GITHEAD_$cmt GITHEAD_$hd
 113         if test -n "$GIT_QUIET"
 114         then
 115                 GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
 116         fi
 117         eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
 118         rv=$?
 119         case "$rv" in
 120         0)
 121                 unset GITHEAD_$cmt GITHEAD_$hd
 122                 return
 123                 ;;
 124         1)
 125                 git rerere $allow_rerere_autoupdate
 126                 die "$RESOLVEMSG"
 127                 ;;
 128         2)
 129                 echo "Strategy: $rv $strategy failed, try another" 1>&2
 130                 die "$RESOLVEMSG"
 131                 ;;
 132         *)
 133                 die "Unknown exit code ($rv) from command:" \
 134                         "git-merge-$strategy $cmt^ -- HEAD $cmt"
 135                 ;;
 136         esac
 137 }
 138
 139 move_to_original_branch () {
 140         test -z "$head_name" &&
 141                 head_name="$(cat "$dotest"/head-name)" &&
 142                 onto="$(cat "$dotest"/onto)" &&
 143                 orig_head="$(cat "$dotest"/orig-head)"
 144         case "$head_name" in
 145         refs/*)
 146                 message="rebase finished: $head_name onto $onto"
 147                 git update-ref -m "$message" \
 148                         $head_name $(git rev-parse HEAD) $orig_head &&
 149                 git symbolic-ref HEAD $head_name ||
 150                 die "Could not move back to $head_name"
 151                 ;;
 152         esac
 153 }
 154
 155 finish_rb_merge () {
 156         move_to_original_branch
 157         git notes copy --for-rewrite=rebase < "$dotest"/rewritten
 158         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 159                 test -s "$dotest"/rewritten; then
 160                 "$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten
 161         fi
 162         rm -r "$dotest"
 163         say All done.
 164 }
 165
 166 is_interactive () {
 167         while test $# != 0
 168         do
 169                 case "$1" in
 170                         -i|--interactive)
 171                                 interactive_rebase=explicit
 172                                 break
 173                         ;;
 174                         -p|--preserve-merges)
 175                                 interactive_rebase=implied
 176                         ;;
 177                 esac
 178                 shift
 179         done
 180
 181         if [ "$interactive_rebase" = implied ]; then
 182                 GIT_EDITOR=:
 183                 export GIT_EDITOR
 184         fi
 185
 186         test -n "$interactive_rebase" || test -f "$dotest"/interactive
 187 }
 188
 189 run_pre_rebase_hook () {
 190         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 191            test -x "$GIT_DIR/hooks/pre-rebase"
 192         then
 193                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
 194                 die "The pre-rebase hook refused to rebase."
 195         fi
 196 }
 197
 198 test -f "$GIT_DIR"/rebase-apply/applying &&
 199         die 'It looks like git-am is in progress. Cannot rebase.'
 200
 201 is_interactive "$@" && exec git-rebase--interactive "$@"
 202
 203 while test $# != 0
 204 do
 205         case "$1" in
 206         --no-verify)
 207                 OK_TO_SKIP_PRE_REBASE=yes
 208                 ;;
 209         --continue)
 210                 test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 211                         die "No rebase in progress?"
 212
 213                 git update-index --ignore-submodules --refresh &&
 214                 git diff-files --quiet --ignore-submodules || {
 215                         echo "You must edit all merge conflicts and then"
 216                         echo "mark them as resolved using git add"
 217                         exit 1
 218                 }
 219                 if test -d "$dotest"
 220                 then
 221                         prev_head=$(cat "$dotest/prev_head")
 222                         end=$(cat "$dotest/end")
 223                         msgnum=$(cat "$dotest/msgnum")
 224                         onto=$(cat "$dotest/onto")
 225                         GIT_QUIET=$(cat "$dotest/quiet")
 226                         continue_merge
 227                         while test "$msgnum" -le "$end"
 228                         do
 229                                 call_merge "$msgnum"
 230                                 continue_merge
 231                         done
 232                         finish_rb_merge
 233                         exit
 234                 fi
 235                 head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
 236                 onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
 237                 orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
 238                 GIT_QUIET=$(cat "$GIT_DIR"/rebase-apply/quiet)
 239                 git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
 240                 move_to_original_branch
 241                 exit
 242                 ;;
 243         --skip)
 244                 test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 245                         die "No rebase in progress?"
 246
 247                 git reset --hard HEAD || exit $?
 248                 if test -d "$dotest"
 249                 then
 250                         git rerere clear
 251                         prev_head=$(cat "$dotest/prev_head")
 252                         end=$(cat "$dotest/end")
 253                         msgnum=$(cat "$dotest/msgnum")
 254                         msgnum=$(($msgnum + 1))
 255                         onto=$(cat "$dotest/onto")
 256                         GIT_QUIET=$(cat "$dotest/quiet")
 257                         while test "$msgnum" -le "$end"
 258                         do
 259                                 call_merge "$msgnum"
 260                                 continue_merge
 261                         done
 262                         finish_rb_merge
 263                         exit
 264                 fi
 265                 head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
 266                 onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
 267                 orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
 268                 GIT_QUIET=$(cat "$GIT_DIR"/rebase-apply/quiet)
 269                 git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
 270                 move_to_original_branch
 271                 exit
 272                 ;;
 273         --abort)
 274                 test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 275                         die "No rebase in progress?"
 276
 277                 git rerere clear
 278
 279                 test -d "$dotest" || dotest="$GIT_DIR"/rebase-apply
 280
 281                 head_name="$(cat "$dotest"/head-name)" &&
 282                 case "$head_name" in
 283                 refs/*)
 284                         git symbolic-ref HEAD $head_name ||
 285                         die "Could not move back to $head_name"
 286                         ;;
 287                 esac
 288                 git reset --hard $(cat "$dotest/orig-head")
 289                 rm -r "$dotest"
 290                 exit
 291                 ;;
 292         --onto)
 293                 test 2 -le "$#" || usage
 294                 newbase="$2"
 295                 shift
 296                 ;;
 297         -M|-m|--m|--me|--mer|--merg|--merge)
 298                 do_merge=t
 299                 ;;
 300         -X*|--strategy-option*)
 301                 case "$#,$1" in
 302                 1,-X|1,--strategy-option)
 303                         usage ;;
 304                 *,-X|*,--strategy-option)
 305                         newopt="$2"
 306                         shift ;;
 307                 *,--strategy-option=*)
 308                         newopt="$(expr " $1" : ' --strategy-option=\(.*\)')" ;;
 309                 *,-X*)
 310                         newopt="$(expr " $1" : ' -X\(.*\)')" ;;
 311                 1,*)
 312                         usage ;;
 313                 esac
 314                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$newopt")"
 315                 do_merge=t
 316                 ;;
 317         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 318                 --strateg=*|--strategy=*|\
 319         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 320                 case "$#,$1" in
 321                 *,*=*)
 322                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 323                 1,*)
 324                         usage ;;
 325                 *)
 326                         strategy="$2"
 327                         shift ;;
 328                 esac
 329                 do_merge=t
 330                 ;;
 331         -n|--no-stat)
 332                 diffstat=
 333                 ;;
 334         --stat)
 335                 diffstat=t
 336                 ;;
 337         -v|--verbose)
 338                 verbose=t
 339                 diffstat=t
 340                 GIT_QUIET=
 341                 ;;
 342         -q|--quiet)
 343                 GIT_QUIET=t
 344                 git_am_opt="$git_am_opt -q"
 345                 verbose=
 346                 diffstat=
 347                 ;;
 348         --whitespace=*)
 349                 git_am_opt="$git_am_opt $1"
 350                 case "$1" in
 351                 --whitespace=fix|--whitespace=strip)
 352                         force_rebase=t
 353                         ;;
 354                 esac
 355                 ;;
 356         --ignore-whitespace)
 357                 git_am_opt="$git_am_opt $1"
 358                 ;;
 359         --committer-date-is-author-date|--ignore-date)
 360                 git_am_opt="$git_am_opt $1"
 361                 force_rebase=t
 362                 ;;
 363         -C*)
 364                 git_am_opt="$git_am_opt $1"
 365                 ;;
 366         --root)
 367                 rebase_root=t
 368                 ;;
 369         -f|--f|--fo|--for|--forc|--force|--force-r|--force-re|--force-reb|--force-reba|--force-rebas|--force-rebase|--no-ff)
 370                 force_rebase=t
 371                 ;;
 372         --rerere-autoupdate|--no-rerere-autoupdate)
 373                 allow_rerere_autoupdate="$1"
 374                 ;;
 375         -*)
 376                 usage
 377                 ;;
 378         *)
 379                 break
 380                 ;;
 381         esac
 382         shift
 383 done
 384 test $# -gt 2 && usage
 385
 386 if test $# -eq 0 && test -z "$rebase_root"
 387 then
 388         test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply || usage
 389         test -d "$dotest" -o -f "$GIT_DIR"/rebase-apply/rebasing &&
 390                 die 'A rebase is in progress, try --continue, --skip or --abort.'
 391 fi
 392
 393 # Make sure we do not have $GIT_DIR/rebase-apply
 394 if test -z "$do_merge"
 395 then
 396         if mkdir "$GIT_DIR"/rebase-apply 2>/dev/null
 397         then
 398                 rmdir "$GIT_DIR"/rebase-apply
 399         else
 400                 echo >&2 '
 401 It seems that I cannot create a rebase-apply directory, and
 402 I wonder if you are in the middle of patch application or another
 403 rebase.  If that is not the case, please
 404         rm -fr '"$GIT_DIR"'/rebase-apply
 405 and run me again.  I am stopping in case you still have something
 406 valuable there.'
 407                 exit 1
 408         fi
 409 else
 410         if test -d "$dotest"
 411         then
 412                 die "previous rebase directory $dotest still exists." \
 413                         'Try git rebase (--continue | --abort | --skip)'
 414         fi
 415 fi
 416
 417 # The tree must be really really clean.
 418 if ! git update-index --ignore-submodules --refresh > /dev/null; then
 419         echo >&2 "cannot rebase: you have unstaged changes"
 420         git diff-files --name-status -r --ignore-submodules -- >&2
 421         exit 1
 422 fi
 423 diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
 424 case "$diff" in
 425 ?*)     echo >&2 "cannot rebase: your index contains uncommitted changes"
 426         echo >&2 "$diff"
 427         exit 1
 428         ;;
 429 esac
 430
 431 if test -z "$rebase_root"
 432 then
 433         # The upstream head must be given.  Make sure it is valid.
 434         upstream_name="$1"
 435         shift
 436         upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 437         die "invalid upstream $upstream_name"
 438         unset root_flag
 439         upstream_arg="$upstream_name"
 440 else
 441         test -z "$newbase" && die "--root must be used with --onto"
 442         unset upstream_name
 443         unset upstream
 444         root_flag="--root"
 445         upstream_arg="$root_flag"
 446 fi
 447
 448 # Make sure the branch to rebase onto is valid.
 449 onto_name=${newbase-"$upstream_name"}
 450 case "$onto_name" in
 451 *...*)
 452         if      left=${onto_name%...*} right=${onto_name#*...} &&
 453                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 454         then
 455                 case "$onto" in
 456                 ?*"$LF"?*)
 457                         die "$onto_name: there are more than one merge bases"
 458                         ;;
 459                 '')
 460                         die "$onto_name: there is no merge base"
 461                         ;;
 462                 esac
 463         else
 464                 die "$onto_name: there is no merge base"
 465         fi
 466         ;;
 467 *)
 468         onto=$(git rev-parse --verify "${onto_name}^0") || exit
 469         ;;
 470 esac
 471
 472 # If a hook exists, give it a chance to interrupt
 473 run_pre_rebase_hook "$upstream_arg" "$@"
 474
 475 # If the branch to rebase is given, that is the branch we will rebase
 476 # $branch_name -- branch being rebased, or HEAD (already detached)
 477 # $orig_head -- commit object name of tip of the branch before rebasing
 478 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 479 switch_to=
 480 case "$#" in
 481 1)
 482         # Is it "rebase other $branchname" or "rebase other $commit"?
 483         branch_name="$1"
 484         switch_to="$1"
 485
 486         if git show-ref --verify --quiet -- "refs/heads/$1" &&
 487            branch=$(git rev-parse -q --verify "refs/heads/$1")
 488         then
 489                 head_name="refs/heads/$1"
 490         elif branch=$(git rev-parse -q --verify "$1")
 491         then
 492                 head_name="detached HEAD"
 493         else
 494                 echo >&2 "fatal: no such branch: $1"
 495                 usage
 496         fi
 497         ;;
 498 *)
 499         # Do not need to switch branches, we are already on it.
 500         if branch_name=`git symbolic-ref -q HEAD`
 501         then
 502                 head_name=$branch_name
 503                 branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 504         else
 505                 head_name="detached HEAD"
 506                 branch_name=HEAD ;# detached
 507         fi
 508         branch=$(git rev-parse --verify "${branch_name}^0") || exit
 509         ;;
 510 esac
 511 orig_head=$branch
 512
 513 # Now we are rebasing commits $upstream..$branch (or with --root,
 514 # everything leading up to $branch) on top of $onto
 515
 516 # Check if we are already based on $onto with linear history,
 517 # but this should be done only when upstream and onto are the same.
 518 mb=$(git merge-base "$onto" "$branch")
 519 if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 520         # linear history?
 521         ! (git rev-list --parents "$onto".."$branch" | sane_grep " .* ") > /dev/null
 522 then
 523         if test -z "$force_rebase"
 524         then
 525                 # Lazily switch to the target branch if needed...
 526                 test -z "$switch_to" || git checkout "$switch_to" --
 527                 say "Current branch $branch_name is up to date."
 528                 exit 0
 529         else
 530                 say "Current branch $branch_name is up to date, rebase forced."
 531         fi
 532 fi
 533
 534 # Detach HEAD and reset the tree
 535 say "First, rewinding head to replay your work on top of it..."
 536 git checkout -q "$onto^0" || die "could not detach HEAD"
 537 git update-ref ORIG_HEAD $branch
 538
 539 if test -n "$diffstat"
 540 then
 541         if test -n "$verbose"
 542         then
 543                 echo "Changes from $mb to $onto:"
 544         fi
 545         # We want color (if set), but no pager
 546         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 547 fi
 548
 549 # If the $onto is a proper descendant of the tip of the branch, then
 550 # we just fast-forwarded.
 551 if test "$mb" = "$branch"
 552 then
 553         say "Fast-forwarded $branch_name to $onto_name."
 554         move_to_original_branch
 555         exit 0
 556 fi
 557
 558 if test -n "$rebase_root"
 559 then
 560         revisions="$onto..$orig_head"
 561 else
 562         revisions="$upstream..$orig_head"
 563 fi
 564
 565 if test -z "$do_merge"
 566 then
 567         git format-patch -k --stdout --full-index --ignore-if-in-upstream \
 568                 --src-prefix=a/ --dst-prefix=b/ \
 569                 --no-renames $root_flag "$revisions" |
 570         git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
 571         move_to_original_branch
 572         ret=$?
 573         test 0 != $ret -a -d "$GIT_DIR"/rebase-apply &&
 574                 echo $head_name > "$GIT_DIR"/rebase-apply/head-name &&
 575                 echo $onto > "$GIT_DIR"/rebase-apply/onto &&
 576                 echo $orig_head > "$GIT_DIR"/rebase-apply/orig-head &&
 577                 echo "$GIT_QUIET" > "$GIT_DIR"/rebase-apply/quiet
 578         exit $ret
 579 fi
 580
 581 # start doing a rebase with git-merge
 582 # this is rename-aware if the recursive (default) strategy is used
 583
 584 mkdir -p "$dotest"
 585 echo "$onto" > "$dotest/onto"
 586 echo "$onto_name" > "$dotest/onto_name"
 587 prev_head=$orig_head
 588 echo "$prev_head" > "$dotest/prev_head"
 589 echo "$orig_head" > "$dotest/orig-head"
 590 echo "$head_name" > "$dotest/head-name"
 591 echo "$GIT_QUIET" > "$dotest/quiet"
 592
 593 msgnum=0
 594 for cmt in `git rev-list --reverse --no-merges "$revisions"`
 595 do
 596         msgnum=$(($msgnum + 1))
 597         echo "$cmt" > "$dotest/cmt.$msgnum"
 598 done
 599
 600 echo 1 >"$dotest/msgnum"
 601 echo $msgnum >"$dotest/end"
 602
 603 end=$msgnum
 604 msgnum=1
 605
 606 while test "$msgnum" -le "$end"
 607 do
 608         call_merge "$msgnum"
 609         continue_merge
 610 done
 611
 612 finish_rb_merge