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