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 onto
  46 strategy=
  47 strategy_opts=
  48 do_merge=
  49 merge_dir="$GIT_DIR"/rebase-merge
  50 apply_dir="$GIT_DIR"/rebase-apply
  51 prec=4
  52 verbose=
  53 diffstat=
  54 test "$(git config --bool rebase.stat)" = true && diffstat=t
  55 git_am_opt=
  56 rebase_root=
  57 force_rebase=
  58 allow_rerere_autoupdate=
  59 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  60 in_progress=
  61 # One of {am, merge, interactive}
  62 type=
  63 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  64 state_dir=
  65 # One of {'', continue, skip, abort}, as parsed from command line
  66 action=
  67 preserve_merges=
  68 autosquash=
  69 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  70
  71 read_state () {
  72         if test "$type" = merge
  73         then
  74                 onto_name=$(cat "$state_dir"/onto_name) &&
  75                 end=$(cat "$state_dir"/end) &&
  76                 msgnum=$(cat "$state_dir"/msgnum)
  77         fi &&
  78         head_name=$(cat "$state_dir"/head-name) &&
  79         onto=$(cat "$state_dir"/onto) &&
  80         orig_head=$(cat "$state_dir"/orig-head) &&
  81         GIT_QUIET=$(cat "$state_dir"/quiet)
  82 }
  83
  84 continue_merge () {
  85         test -d "$merge_dir" || die "$merge_dir directory does not exist"
  86
  87         unmerged=$(git ls-files -u)
  88         if test -n "$unmerged"
  89         then
  90                 echo "You still have unmerged paths in your index"
  91                 echo "did you forget to use git add?"
  92                 die "$resolvemsg"
  93         fi
  94
  95         cmt=`cat "$merge_dir/current"`
  96         if ! git diff-index --quiet --ignore-submodules HEAD --
  97         then
  98                 if ! git commit --no-verify -C "$cmt"
  99                 then
 100                         echo "Commit failed, please do not call \"git commit\""
 101                         echo "directly, but instead do one of the following: "
 102                         die "$resolvemsg"
 103                 fi
 104                 if test -z "$GIT_QUIET"
 105                 then
 106                         printf "Committed: %0${prec}d " $msgnum
 107                 fi
 108                 echo "$cmt $(git rev-parse HEAD^0)" >> "$merge_dir/rewritten"
 109         else
 110                 if test -z "$GIT_QUIET"
 111                 then
 112                         printf "Already applied: %0${prec}d " $msgnum
 113                 fi
 114         fi
 115         test -z "$GIT_QUIET" &&
 116         GIT_PAGER='' git log --format=%s -1 "$cmt"
 117
 118         # onto the next patch:
 119         msgnum=$(($msgnum + 1))
 120         echo "$msgnum" >"$merge_dir/msgnum"
 121 }
 122
 123 call_merge () {
 124         cmt="$(cat "$merge_dir/cmt.$1")"
 125         echo "$cmt" > "$merge_dir/current"
 126         hd=$(git rev-parse --verify HEAD)
 127         cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
 128         msgnum=$(cat "$merge_dir/msgnum")
 129         eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
 130         eval GITHEAD_$hd='$onto_name'
 131         export GITHEAD_$cmt GITHEAD_$hd
 132         if test -n "$GIT_QUIET"
 133         then
 134                 GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
 135         fi
 136         test -z "$strategy" && strategy=recursive
 137         eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
 138         rv=$?
 139         case "$rv" in
 140         0)
 141                 unset GITHEAD_$cmt GITHEAD_$hd
 142                 return
 143                 ;;
 144         1)
 145                 git rerere $allow_rerere_autoupdate
 146                 die "$resolvemsg"
 147                 ;;
 148         2)
 149                 echo "Strategy: $rv $strategy failed, try another" 1>&2
 150                 die "$resolvemsg"
 151                 ;;
 152         *)
 153                 die "Unknown exit code ($rv) from command:" \
 154                         "git-merge-$strategy $cmt^ -- HEAD $cmt"
 155                 ;;
 156         esac
 157 }
 158
 159 move_to_original_branch () {
 160         case "$head_name" in
 161         refs/*)
 162                 message="rebase finished: $head_name onto $onto"
 163                 git update-ref -m "$message" \
 164                         $head_name $(git rev-parse HEAD) $orig_head &&
 165                 git symbolic-ref HEAD $head_name ||
 166                 die "Could not move back to $head_name"
 167                 ;;
 168         esac
 169 }
 170
 171 finish_rb_merge () {
 172         move_to_original_branch
 173         git notes copy --for-rewrite=rebase < "$merge_dir"/rewritten
 174         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 175                 test -s "$merge_dir"/rewritten; then
 176                 "$GIT_DIR"/hooks/post-rewrite rebase < "$merge_dir"/rewritten
 177         fi
 178         rm -r "$merge_dir"
 179         say All done.
 180 }
 181
 182 run_interactive_rebase () {
 183         if [ "$interactive_rebase" = implied ]; then
 184                 GIT_EDITOR=:
 185                 export GIT_EDITOR
 186         fi
 187         . git-rebase--interactive "$@"
 188 }
 189
 190 run_pre_rebase_hook () {
 191         if test -z "$ok_to_skip_pre_rebase" &&
 192            test -x "$GIT_DIR/hooks/pre-rebase"
 193         then
 194                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
 195                 die "The pre-rebase hook refused to rebase."
 196         fi
 197 }
 198
 199 test -f "$apply_dir"/applying &&
 200         die 'It looks like git-am is in progress. Cannot rebase.'
 201
 202 if test -d "$apply_dir"
 203 then
 204         type=am
 205         state_dir="$apply_dir"
 206 elif test -d "$merge_dir"
 207 then
 208         if test -f "$merge_dir"/interactive
 209         then
 210                 type=interactive
 211                 interactive_rebase=explicit
 212         else
 213                 type=merge
 214         fi
 215         state_dir="$merge_dir"
 216 fi
 217 test -n "$type" && in_progress=t
 218
 219 total_argc=$#
 220 while test $# != 0
 221 do
 222         case "$1" in
 223         --no-verify)
 224                 ok_to_skip_pre_rebase=yes
 225                 ;;
 226         --verify)
 227                 ok_to_skip_pre_rebase=
 228                 ;;
 229         --continue|--skip|--abort)
 230                 test $total_argc -eq 1 || usage
 231                 action=${1##--}
 232                 ;;
 233         --onto)
 234                 test 2 -le "$#" || usage
 235                 onto="$2"
 236                 shift
 237                 ;;
 238         -i|--interactive)
 239                 interactive_rebase=explicit
 240                 ;;
 241         -p|--preserve-merges)
 242                 preserve_merges=t
 243                 test -z "$interactive_rebase" && interactive_rebase=implied
 244                 ;;
 245         --autosquash)
 246                 autosquash=t
 247                 ;;
 248         --no-autosquash)
 249                 autosquash=
 250                 ;;
 251         -M|-m|--m|--me|--mer|--merg|--merge)
 252                 do_merge=t
 253                 ;;
 254         -X*|--strategy-option*)
 255                 case "$#,$1" in
 256                 1,-X|1,--strategy-option)
 257                         usage ;;
 258                 *,-X|*,--strategy-option)
 259                         newopt="$2"
 260                         shift ;;
 261                 *,--strategy-option=*)
 262                         newopt="$(expr " $1" : ' --strategy-option=\(.*\)')" ;;
 263                 *,-X*)
 264                         newopt="$(expr " $1" : ' -X\(.*\)')" ;;
 265                 1,*)
 266                         usage ;;
 267                 esac
 268                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$newopt")"
 269                 do_merge=t
 270                 test -z "$strategy" && strategy=recursive
 271                 ;;
 272         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 273                 --strateg=*|--strategy=*|\
 274         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 275                 case "$#,$1" in
 276                 *,*=*)
 277                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 278                 1,*)
 279                         usage ;;
 280                 *)
 281                         strategy="$2"
 282                         shift ;;
 283                 esac
 284                 do_merge=t
 285                 ;;
 286         -n|--no-stat)
 287                 diffstat=
 288                 ;;
 289         --stat)
 290                 diffstat=t
 291                 ;;
 292         -v|--verbose)
 293                 verbose=t
 294                 diffstat=t
 295                 GIT_QUIET=
 296                 ;;
 297         -q|--quiet)
 298                 GIT_QUIET=t
 299                 git_am_opt="$git_am_opt -q"
 300                 verbose=
 301                 diffstat=
 302                 ;;
 303         --whitespace=*)
 304                 git_am_opt="$git_am_opt $1"
 305                 case "$1" in
 306                 --whitespace=fix|--whitespace=strip)
 307                         force_rebase=t
 308                         ;;
 309                 esac
 310                 ;;
 311         --ignore-whitespace)
 312                 git_am_opt="$git_am_opt $1"
 313                 ;;
 314         --committer-date-is-author-date|--ignore-date)
 315                 git_am_opt="$git_am_opt $1"
 316                 force_rebase=t
 317                 ;;
 318         -C*)
 319                 git_am_opt="$git_am_opt $1"
 320                 ;;
 321         --root)
 322                 rebase_root=t
 323                 ;;
 324         -f|--f|--fo|--for|--forc|--force|--force-r|--force-re|--force-reb|--force-reba|--force-rebas|--force-rebase|--no-ff)
 325                 force_rebase=t
 326                 ;;
 327         --rerere-autoupdate|--no-rerere-autoupdate)
 328                 allow_rerere_autoupdate="$1"
 329                 ;;
 330         -*)
 331                 usage
 332                 ;;
 333         *)
 334                 break
 335                 ;;
 336         esac
 337         shift
 338 done
 339 test $# -gt 2 && usage
 340
 341 if test -n "$action"
 342 then
 343         test -z "$in_progress" && die "No rebase in progress?"
 344         test "$type" = interactive && run_interactive_rebase
 345 fi
 346
 347 case "$action" in
 348 continue)
 349         git update-index --ignore-submodules --refresh &&
 350         git diff-files --quiet --ignore-submodules || {
 351                 echo "You must edit all merge conflicts and then"
 352                 echo "mark them as resolved using git add"
 353                 exit 1
 354         }
 355         read_state
 356         if test -d "$merge_dir"
 357         then
 358                 continue_merge
 359                 while test "$msgnum" -le "$end"
 360                 do
 361                         call_merge "$msgnum"
 362                         continue_merge
 363                 done
 364                 finish_rb_merge
 365                 exit
 366         fi
 367         git am --resolved --3way --resolvemsg="$resolvemsg" &&
 368         move_to_original_branch
 369         exit
 370         ;;
 371 skip)
 372         git reset --hard HEAD || exit $?
 373         read_state
 374         if test -d "$merge_dir"
 375         then
 376                 git rerere clear
 377                 msgnum=$(($msgnum + 1))
 378                 while test "$msgnum" -le "$end"
 379                 do
 380                         call_merge "$msgnum"
 381                         continue_merge
 382                 done
 383                 finish_rb_merge
 384                 exit
 385         fi
 386         git am -3 --skip --resolvemsg="$resolvemsg" &&
 387         move_to_original_branch
 388         exit
 389         ;;
 390 abort)
 391         git rerere clear
 392         read_state
 393         case "$head_name" in
 394         refs/*)
 395                 git symbolic-ref HEAD $head_name ||
 396                 die "Could not move back to $head_name"
 397                 ;;
 398         esac
 399         git reset --hard $orig_head
 400         rm -r "$state_dir"
 401         exit
 402         ;;
 403 esac
 404
 405 # Make sure no rebase is in progress
 406 if test -n "$in_progress"
 407 then
 408         die '
 409 It seems that there is already a '"${state_dir##*/}"' directory, and
 410 I wonder if you are in the middle of another rebase.  If that is the
 411 case, please try
 412         git rebase (--continue | --abort | --skip)
 413 If that is not the case, please
 414         rm -fr '"$state_dir"'
 415 and run me again.  I am stopping in case you still have something
 416 valuable there.'
 417 fi
 418
 419 test $# -eq 0 && test -z "$rebase_root" && usage
 420
 421 if test -n "$interactive_rebase"
 422 then
 423         type=interactive
 424         state_dir="$merge_dir"
 425 elif test -n "$do_merge"
 426 then
 427         type=merge
 428         state_dir="$merge_dir"
 429 else
 430         type=am
 431         state_dir="$apply_dir"
 432 fi
 433
 434 if test -z "$rebase_root"
 435 then
 436         # The upstream head must be given.  Make sure it is valid.
 437         upstream_name="$1"
 438         shift
 439         upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 440         die "invalid upstream $upstream_name"
 441         unset root_flag
 442         upstream_arg="$upstream_name"
 443 else
 444         test -z "$onto" && die "You must specify --onto when using --root"
 445         unset upstream_name
 446         unset upstream
 447         root_flag="--root"
 448         upstream_arg="$root_flag"
 449 fi
 450
 451 # Make sure the branch to rebase onto is valid.
 452 onto_name=${onto-"$upstream_name"}
 453 case "$onto_name" in
 454 *...*)
 455         if      left=${onto_name%...*} right=${onto_name#*...} &&
 456                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 457         then
 458                 case "$onto" in
 459                 ?*"$LF"?*)
 460                         die "$onto_name: there are more than one merge bases"
 461                         ;;
 462                 '')
 463                         die "$onto_name: there is no merge base"
 464                         ;;
 465                 esac
 466         else
 467                 die "$onto_name: there is no merge base"
 468         fi
 469         ;;
 470 *)
 471         onto=$(git rev-parse --verify "${onto_name}^0") ||
 472         die "Does not point to a valid commit: $onto_name"
 473         ;;
 474 esac
 475
 476 # If the branch to rebase is given, that is the branch we will rebase
 477 # $branch_name -- branch being rebased, or HEAD (already detached)
 478 # $orig_head -- commit object name of tip of the branch before rebasing
 479 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 480 switch_to=
 481 case "$#" in
 482 1)
 483         # Is it "rebase other $branchname" or "rebase other $commit"?
 484         branch_name="$1"
 485         switch_to="$1"
 486
 487         if git show-ref --verify --quiet -- "refs/heads/$1" &&
 488            branch=$(git rev-parse -q --verify "refs/heads/$1")
 489         then
 490                 head_name="refs/heads/$1"
 491         elif branch=$(git rev-parse -q --verify "$1")
 492         then
 493                 head_name="detached HEAD"
 494         else
 495                 echo >&2 "fatal: no such branch: $1"
 496                 usage
 497         fi
 498         ;;
 499 *)
 500         # Do not need to switch branches, we are already on it.
 501         if branch_name=`git symbolic-ref -q HEAD`
 502         then
 503                 head_name=$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         branch=$(git rev-parse --verify "${branch_name}^0") || exit
 510         ;;
 511 esac
 512 orig_head=$branch
 513
 514 test "$type" = interactive && run_interactive_rebase "$@"
 515
 516 require_clean_work_tree "rebase" "Please commit or stash them."
 517
 518 # Now we are rebasing commits $upstream..$branch (or with --root,
 519 # everything leading up to $branch) on top of $onto
 520
 521 # Check if we are already based on $onto with linear history,
 522 # but this should be done only when upstream and onto are the same.
 523 mb=$(git merge-base "$onto" "$branch")
 524 if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 525         # linear history?
 526         ! (git rev-list --parents "$onto".."$branch" | sane_grep " .* ") > /dev/null
 527 then
 528         if test -z "$force_rebase"
 529         then
 530                 # Lazily switch to the target branch if needed...
 531                 test -z "$switch_to" || git checkout "$switch_to" --
 532                 say "Current branch $branch_name is up to date."
 533                 exit 0
 534         else
 535                 say "Current branch $branch_name is up to date, rebase forced."
 536         fi
 537 fi
 538
 539 # If a hook exists, give it a chance to interrupt
 540 run_pre_rebase_hook "$upstream_arg" "$@"
 541
 542 # Detach HEAD and reset the tree
 543 say "First, rewinding head to replay your work on top of it..."
 544 git checkout -q "$onto^0" || die "could not detach HEAD"
 545 git update-ref ORIG_HEAD $branch
 546
 547 if test -n "$diffstat"
 548 then
 549         if test -n "$verbose"
 550         then
 551                 echo "Changes from $mb to $onto:"
 552         fi
 553         # We want color (if set), but no pager
 554         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 555 fi
 556
 557 # If the $onto is a proper descendant of the tip of the branch, then
 558 # we just fast-forwarded.
 559 if test "$mb" = "$branch"
 560 then
 561         say "Fast-forwarded $branch_name to $onto_name."
 562         move_to_original_branch
 563         exit 0
 564 fi
 565
 566 if test -n "$rebase_root"
 567 then
 568         revisions="$onto..$orig_head"
 569 else
 570         revisions="$upstream..$orig_head"
 571 fi
 572
 573 if test -z "$do_merge"
 574 then
 575         git format-patch -k --stdout --full-index --ignore-if-in-upstream \
 576                 --src-prefix=a/ --dst-prefix=b/ \
 577                 --no-renames $root_flag "$revisions" |
 578         git am $git_am_opt --rebasing --resolvemsg="$resolvemsg" &&
 579         move_to_original_branch
 580         ret=$?
 581         test 0 != $ret -a -d "$apply_dir" &&
 582                 echo $head_name > "$apply_dir/head-name" &&
 583                 echo $onto > "$apply_dir/onto" &&
 584                 echo $orig_head > "$apply_dir/orig-head" &&
 585                 echo "$GIT_QUIET" > "$apply_dir/quiet"
 586         exit $ret
 587 fi
 588
 589 # start doing a rebase with git-merge
 590 # this is rename-aware if the recursive (default) strategy is used
 591
 592 mkdir -p "$merge_dir"
 593 echo "$onto_name" > "$merge_dir/onto_name"
 594 echo "$head_name" > "$merge_dir/head-name"
 595 echo "$onto" > "$merge_dir/onto"
 596 echo "$orig_head" > "$merge_dir/orig-head"
 597 echo "$GIT_QUIET" > "$merge_dir/quiet"
 598
 599 msgnum=0
 600 for cmt in `git rev-list --reverse --no-merges "$revisions"`
 601 do
 602         msgnum=$(($msgnum + 1))
 603         echo "$cmt" > "$merge_dir/cmt.$msgnum"
 604 done
 605
 606 echo 1 >"$merge_dir/msgnum"
 607 echo $msgnum >"$merge_dir/end"
 608
 609 end=$msgnum
 610 msgnum=1
 611
 612 while test "$msgnum" -le "$end"
 613 do
 614         call_merge "$msgnum"
 615         continue_merge
 616 done
 617
 618 finish_rb_merge