git-rebase.sh

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