Andrew's git - gitweb.git/blob

   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Junio C Hamano.
   4#
   5
   6USAGE='[--interactive | -i] [-v] [--onto <newbase>] <upstream> [<branch>]'
   7LONG_USAGE='git-rebase replaces <branch> with a new branch of the
   8same name.  When the --onto option is provided the new branch starts
   9out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
  10It then attempts to create a new commit for each commit from the original
  11<branch> that does not exist in the <upstream> branch.
  12
  13It is possible that a merge failure will prevent this process from being
  14completely automatic.  You will have to resolve any such merge failure
  15and run git rebase --continue.  Another option is to bypass the commit
  16that caused the merge failure with git rebase --skip.  To restore the
  17original <branch> and remove the .dotest working files, use the command
  18git rebase --abort instead.
  19
  20Note that if <branch> is not specified on the command line, the
  21currently checked out branch is used.
  22
  23Example:       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
  30SUBDIRECTORY_OK=Yes
  31OPTIONS_SPEC=
  32. git-sh-setup
  33set_reflog_action rebase
  34require_work_tree
  35cd_to_toplevel
  36
  37RESOLVEMSG="
  38When you have resolved this problem run \"git rebase --continue\".
  39If you would prefer to skip this patch, instead run \"git rebase --skip\".
  40To restore the original branch and stop rebasing run \"git rebase --abort\".
  41"
  42unset newbase
  43strategy=recursive
  44do_merge=
  45dotest=$GIT_DIR/.dotest-merge
  46prec=4
  47verbose=
  48git_am_opt=
  49
  50continue_merge () {
  51        test -n "$prev_head" || die "prev_head must be defined"
  52        test -d "$dotest" || die "$dotest directory does not exist"
  53
  54        unmerged=$(git ls-files -u)
  55        if test -n "$unmerged"
  56        then
  57                echo "You still have unmerged paths in your index"
  58                echo "did you forget to use git add?"
  59                die "$RESOLVEMSG"
  60        fi
  61
  62        cmt=`cat "$dotest/current"`
  63        if ! git diff-index --quiet --ignore-submodules HEAD --
  64        then
  65                if ! git commit --no-verify -C "$cmt"
  66                then
  67                        echo "Commit failed, please do not call \"git commit\""
  68                        echo "directly, but instead do one of the following: "
  69                        die "$RESOLVEMSG"
  70                fi
  71                printf "Committed: %0${prec}d " $msgnum
  72        else
  73                printf "Already applied: %0${prec}d " $msgnum
  74        fi
  75        git rev-list --pretty=oneline -1 "$cmt" | sed -e 's/^[^ ]* //'
  76
  77        prev_head=`git rev-parse HEAD^0`
  78        # save the resulting commit so we can read-tree on it later
  79        echo "$prev_head" > "$dotest/prev_head"
  80
  81        # onto the next patch:
  82        msgnum=$(($msgnum + 1))
  83        echo "$msgnum" >"$dotest/msgnum"
  84}
  85
  86call_merge () {
  87        cmt="$(cat "$dotest/cmt.$1")"
  88        echo "$cmt" > "$dotest/current"
  89        hd=$(git rev-parse --verify HEAD)
  90        cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
  91        msgnum=$(cat "$dotest/msgnum")
  92        end=$(cat "$dotest/end")
  93        eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
  94        eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
  95        export GITHEAD_$cmt GITHEAD_$hd
  96        git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
  97        rv=$?
  98        case "$rv" in
  99        0)
 100                unset GITHEAD_$cmt GITHEAD_$hd
 101                return
 102                ;;
 103        1)
 104                git rerere
 105                die "$RESOLVEMSG"
 106                ;;
 107        2)
 108                echo "Strategy: $rv $strategy failed, try another" 1>&2
 109                die "$RESOLVEMSG"
 110                ;;
 111        *)
 112                die "Unknown exit code ($rv) from command:" \
 113                        "git-merge-$strategy $cmt^ -- HEAD $cmt"
 114                ;;
 115        esac
 116}
 117
 118move_to_original_branch () {
 119        test -z "$head_name" &&
 120                head_name="$(cat "$dotest"/head-name)" &&
 121                onto="$(cat "$dotest"/onto)" &&
 122                orig_head="$(cat "$dotest"/orig-head)"
 123        case "$head_name" in
 124        refs/*)
 125                message="rebase finished: $head_name onto $onto"
 126                git update-ref -m "$message" \
 127                        $head_name $(git rev-parse HEAD) $orig_head &&
 128                git symbolic-ref HEAD $head_name ||
 129                die "Could not move back to $head_name"
 130                ;;
 131        esac
 132}
 133
 134finish_rb_merge () {
 135        move_to_original_branch
 136        rm -r "$dotest"
 137        echo "All done."
 138}
 139
 140is_interactive () {
 141        test -f "$dotest"/interactive ||
 142        while :; do case $#,"$1" in 0,|*,-i|*,--interactive) break ;; esac
 143                shift
 144        done && test -n "$1"
 145}
 146
 147is_interactive "$@" && exec git-rebase--interactive "$@"
 148
 149while test $# != 0
 150do
 151        case "$1" in
 152        --continue)
 153                git diff-files --quiet --ignore-submodules || {
 154                        echo "You must edit all merge conflicts and then"
 155                        echo "mark them as resolved using git add"
 156                        exit 1
 157                }
 158                if test -d "$dotest"
 159                then
 160                        prev_head=$(cat "$dotest/prev_head")
 161                        end=$(cat "$dotest/end")
 162                        msgnum=$(cat "$dotest/msgnum")
 163                        onto=$(cat "$dotest/onto")
 164                        continue_merge
 165                        while test "$msgnum" -le "$end"
 166                        do
 167                                call_merge "$msgnum"
 168                                continue_merge
 169                        done
 170                        finish_rb_merge
 171                        exit
 172                fi
 173                head_name=$(cat .dotest/head-name) &&
 174                onto=$(cat .dotest/onto) &&
 175                orig_head=$(cat .dotest/orig-head) &&
 176                git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
 177                move_to_original_branch
 178                exit
 179                ;;
 180        --skip)
 181                git reset --hard HEAD || exit $?
 182                if test -d "$dotest"
 183                then
 184                        git rerere clear
 185                        prev_head=$(cat "$dotest/prev_head")
 186                        end=$(cat "$dotest/end")
 187                        msgnum=$(cat "$dotest/msgnum")
 188                        msgnum=$(($msgnum + 1))
 189                        onto=$(cat "$dotest/onto")
 190                        while test "$msgnum" -le "$end"
 191                        do
 192                                call_merge "$msgnum"
 193                                continue_merge
 194                        done
 195                        finish_rb_merge
 196                        exit
 197                fi
 198                head_name=$(cat .dotest/head-name) &&
 199                onto=$(cat .dotest/onto) &&
 200                orig_head=$(cat .dotest/orig-head) &&
 201                git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
 202                move_to_original_branch
 203                exit
 204                ;;
 205        --abort)
 206                git rerere clear
 207                if test -d "$dotest"
 208                then
 209                        move_to_original_branch
 210                elif test -d .dotest
 211                then
 212                        dotest=.dotest
 213                        move_to_original_branch
 214                else
 215                        die "No rebase in progress?"
 216                fi
 217                git reset --hard $(cat "$dotest/orig-head")
 218                rm -r "$dotest"
 219                exit
 220                ;;
 221        --onto)
 222                test 2 -le "$#" || usage
 223                newbase="$2"
 224                shift
 225                ;;
 226        -M|-m|--m|--me|--mer|--merg|--merge)
 227                do_merge=t
 228                ;;
 229        -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 230                --strateg=*|--strategy=*|\
 231        -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 232                case "$#,$1" in
 233                *,*=*)
 234                        strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 235                1,*)
 236                        usage ;;
 237                *)
 238                        strategy="$2"
 239                        shift ;;
 240                esac
 241                do_merge=t
 242                ;;
 243        -v|--verbose)
 244                verbose=t
 245                ;;
 246        --whitespace=*)
 247                git_am_opt="$git_am_opt $1"
 248                ;;
 249        -C*)
 250                git_am_opt="$git_am_opt $1"
 251                ;;
 252        -*)
 253                usage
 254                ;;
 255        *)
 256                break
 257                ;;
 258        esac
 259        shift
 260done
 261
 262# Make sure we do not have .dotest
 263if test -z "$do_merge"
 264then
 265        if mkdir .dotest
 266        then
 267                rmdir .dotest
 268        else
 269                echo >&2 '
 270It seems that I cannot create a .dotest directory, and I wonder if you
 271are in the middle of patch application or another rebase.  If that is not
 272the case, please rm -fr .dotest and run me again.  I am stopping in case
 273you still have something valuable there.'
 274                exit 1
 275        fi
 276else
 277        if test -d "$dotest"
 278        then
 279                die "previous dotest directory $dotest still exists." \
 280                        'try git-rebase < --continue | --abort >'
 281        fi
 282fi
 283
 284# The tree must be really really clean.
 285git update-index --ignore-submodules --refresh || exit
 286diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
 287case "$diff" in
 288?*)     echo "cannot rebase: your index is not up-to-date"
 289        echo "$diff"
 290        exit 1
 291        ;;
 292esac
 293
 294# The upstream head must be given.  Make sure it is valid.
 295upstream_name="$1"
 296upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 297    die "invalid upstream $upstream_name"
 298
 299# Make sure the branch to rebase onto is valid.
 300onto_name=${newbase-"$upstream_name"}
 301onto=$(git rev-parse --verify "${onto_name}^0") || exit
 302
 303# If a hook exists, give it a chance to interrupt
 304if test -x "$GIT_DIR/hooks/pre-rebase"
 305then
 306        "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 307                echo >&2 "The pre-rebase hook refused to rebase."
 308                exit 1
 309        }
 310fi
 311
 312# If the branch to rebase is given, that is the branch we will rebase
 313# $branch_name -- branch being rebased, or HEAD (already detached)
 314# $orig_head -- commit object name of tip of the branch before rebasing
 315# $head_name -- refs/heads/<that-branch> or "detached HEAD"
 316switch_to=
 317case "$#" in
 3182)
 319        # Is it "rebase other $branchname" or "rebase other $commit"?
 320        branch_name="$2"
 321        switch_to="$2"
 322
 323        if git show-ref --verify --quiet -- "refs/heads/$2" &&
 324           branch=$(git rev-parse --verify "refs/heads/$2" 2>/dev/null)
 325        then
 326                head_name="refs/heads/$2"
 327        elif branch=$(git rev-parse --verify "$2" 2>/dev/null)
 328        then
 329                head_name="detached HEAD"
 330        else
 331                usage
 332        fi
 333        ;;
 334*)
 335        # Do not need to switch branches, we are already on it.
 336        if branch_name=`git symbolic-ref -q HEAD`
 337        then
 338                head_name=$branch_name
 339                branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 340        else
 341                head_name="detached HEAD"
 342                branch_name=HEAD ;# detached
 343        fi
 344        branch=$(git rev-parse --verify "${branch_name}^0") || exit
 345        ;;
 346esac
 347orig_head=$branch
 348
 349# Now we are rebasing commits $upstream..$branch on top of $onto
 350
 351# Check if we are already based on $onto with linear history,
 352# but this should be done only when upstream and onto are the same.
 353mb=$(git merge-base "$onto" "$branch")
 354if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 355        # linear history?
 356        ! (git rev-list --parents "$onto".."$branch" | grep " .* ") > /dev/null
 357then
 358        # Lazily switch to the target branch if needed...
 359        test -z "$switch_to" || git checkout "$switch_to"
 360        echo >&2 "Current branch $branch_name is up to date."
 361        exit 0
 362fi
 363
 364if test -n "$verbose"
 365then
 366        echo "Changes from $mb to $onto:"
 367        # We want color (if set), but no pager
 368        GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 369fi
 370
 371# Detach HEAD and reset the tree
 372echo "First, rewinding head to replay your work on top of it..."
 373git checkout "$onto^0" >/dev/null 2>&1 ||
 374        die "could not detach HEAD"
 375# git reset --hard "$onto^0"
 376
 377# If the $onto is a proper descendant of the tip of the branch, then
 378# we just fast forwarded.
 379if test "$mb" = "$branch"
 380then
 381        echo >&2 "Fast-forwarded $branch_name to $onto_name."
 382        move_to_original_branch
 383        exit 0
 384fi
 385
 386if test -z "$do_merge"
 387then
 388        git format-patch -k --stdout --full-index --ignore-if-in-upstream \
 389                "$upstream..$orig_head" |
 390        git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
 391        move_to_original_branch
 392        ret=$?
 393        test 0 != $ret -a -d .dotest &&
 394                echo $head_name > .dotest/head-name &&
 395                echo $onto > .dotest/onto &&
 396                echo $orig_head > .dotest/orig-head
 397        exit $ret
 398fi
 399
 400# start doing a rebase with git-merge
 401# this is rename-aware if the recursive (default) strategy is used
 402
 403mkdir -p "$dotest"
 404echo "$onto" > "$dotest/onto"
 405echo "$onto_name" > "$dotest/onto_name"
 406prev_head=$orig_head
 407echo "$prev_head" > "$dotest/prev_head"
 408echo "$orig_head" > "$dotest/orig-head"
 409echo "$head_name" > "$dotest/head-name"
 410
 411msgnum=0
 412for cmt in `git rev-list --reverse --no-merges "$upstream..$orig_head"`
 413do
 414        msgnum=$(($msgnum + 1))
 415        echo "$cmt" > "$dotest/cmt.$msgnum"
 416done
 417
 418echo 1 >"$dotest/msgnum"
 419echo $msgnum >"$dotest/end"
 420
 421end=$msgnum
 422msgnum=1
 423
 424while test "$msgnum" -le "$end"
 425do
 426        call_merge "$msgnum"
 427        continue_merge
 428done
 429
 430finish_rb_merge