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