Andrew's git / gitweb.git / git-rebase.sh
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git-rebase.shon commit git-sh-setup: Fix scripts whose PWD is a symlink into a git work-dir (08fc060)
   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 .git/rebase-apply working files, use the
  18command git 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
  37OK_TO_SKIP_PRE_REBASE=
  38RESOLVEMSG="
  39When you have resolved this problem run \"git rebase --continue\".
  40If you would prefer to skip this patch, instead run \"git rebase --skip\".
  41To restore the original branch and stop rebasing run \"git rebase --abort\".
  42"
  43unset newbase
  44strategy=recursive
  45do_merge=
  46dotest="$GIT_DIR"/rebase-merge
  47prec=4
  48verbose=
  49git_am_opt=
  50
  51continue_merge () {
  52        test -n "$prev_head" || die "prev_head must be defined"
  53        test -d "$dotest" || die "$dotest directory does not exist"
  54
  55        unmerged=$(git ls-files -u)
  56        if test -n "$unmerged"
  57        then
  58                echo "You still have unmerged paths in your index"
  59                echo "did you forget to use git add?"
  60                die "$RESOLVEMSG"
  61        fi
  62
  63        cmt=`cat "$dotest/current"`
  64        if ! git diff-index --quiet --ignore-submodules HEAD --
  65        then
  66                if ! git commit --no-verify -C "$cmt"
  67                then
  68                        echo "Commit failed, please do not call \"git commit\""
  69                        echo "directly, but instead do one of the following: "
  70                        die "$RESOLVEMSG"
  71                fi
  72                printf "Committed: %0${prec}d " $msgnum
  73        else
  74                printf "Already applied: %0${prec}d " $msgnum
  75        fi
  76        git rev-list --pretty=oneline -1 "$cmt" | sed -e 's/^[^ ]* //'
  77
  78        prev_head=`git rev-parse HEAD^0`
  79        # save the resulting commit so we can read-tree on it later
  80        echo "$prev_head" > "$dotest/prev_head"
  81
  82        # onto the next patch:
  83        msgnum=$(($msgnum + 1))
  84        echo "$msgnum" >"$dotest/msgnum"
  85}
  86
  87call_merge () {
  88        cmt="$(cat "$dotest/cmt.$1")"
  89        echo "$cmt" > "$dotest/current"
  90        hd=$(git rev-parse --verify HEAD)
  91        cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
  92        msgnum=$(cat "$dotest/msgnum")
  93        end=$(cat "$dotest/end")
  94        eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
  95        eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
  96        export GITHEAD_$cmt GITHEAD_$hd
  97        git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
  98        rv=$?
  99        case "$rv" in
 100        0)
 101                unset GITHEAD_$cmt GITHEAD_$hd
 102                return
 103                ;;
 104        1)
 105                git rerere
 106                die "$RESOLVEMSG"
 107                ;;
 108        2)
 109                echo "Strategy: $rv $strategy failed, try another" 1>&2
 110                die "$RESOLVEMSG"
 111                ;;
 112        *)
 113                die "Unknown exit code ($rv) from command:" \
 114                        "git-merge-$strategy $cmt^ -- HEAD $cmt"
 115                ;;
 116        esac
 117}
 118
 119move_to_original_branch () {
 120        test -z "$head_name" &&
 121                head_name="$(cat "$dotest"/head-name)" &&
 122                onto="$(cat "$dotest"/onto)" &&
 123                orig_head="$(cat "$dotest"/orig-head)"
 124        case "$head_name" in
 125        refs/*)
 126                message="rebase finished: $head_name onto $onto"
 127                git update-ref -m "$message" \
 128                        $head_name $(git rev-parse HEAD) $orig_head &&
 129                git symbolic-ref HEAD $head_name ||
 130                die "Could not move back to $head_name"
 131                ;;
 132        esac
 133}
 134
 135finish_rb_merge () {
 136        move_to_original_branch
 137        rm -r "$dotest"
 138        echo "All done."
 139}
 140
 141is_interactive () {
 142        while test $# != 0
 143        do
 144                case "$1" in
 145                        -i|--interactive)
 146                                interactive_rebase=explicit
 147                                break
 148                        ;;
 149                        -p|--preserve-merges)
 150                                interactive_rebase=implied
 151                        ;;
 152                esac
 153                shift
 154        done
 155
 156        if [ "$interactive_rebase" = implied ]; then
 157                GIT_EDITOR=:
 158                export GIT_EDITOR
 159        fi
 160
 161        test -n "$interactive_rebase" || test -f "$dotest"/interactive
 162}
 163
 164run_pre_rebase_hook () {
 165        if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 166           test -x "$GIT_DIR/hooks/pre-rebase"
 167        then
 168                "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 169                        echo >&2 "The pre-rebase hook refused to rebase."
 170                        exit 1
 171                }
 172        fi
 173}
 174
 175test -f "$GIT_DIR"/rebase-apply/applying &&
 176        die 'It looks like git-am is in progress. Cannot rebase.'
 177
 178is_interactive "$@" && exec git-rebase--interactive "$@"
 179
 180if test $# -eq 0
 181then
 182        test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply || usage
 183        test -d "$dotest" -o -f "$GIT_DIR"/rebase-apply/rebasing &&
 184                die 'A rebase is in progress, try --continue, --skip or --abort.'
 185        die "No arguments given and $GIT_DIR/rebase-apply already exists."
 186fi
 187
 188while test $# != 0
 189do
 190        case "$1" in
 191        --no-verify)
 192                OK_TO_SKIP_PRE_REBASE=yes
 193                ;;
 194        --continue)
 195                test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 196                        die "No rebase in progress?"
 197
 198                git diff-files --quiet --ignore-submodules || {
 199                        echo "You must edit all merge conflicts and then"
 200                        echo "mark them as resolved using git add"
 201                        exit 1
 202                }
 203                if test -d "$dotest"
 204                then
 205                        prev_head=$(cat "$dotest/prev_head")
 206                        end=$(cat "$dotest/end")
 207                        msgnum=$(cat "$dotest/msgnum")
 208                        onto=$(cat "$dotest/onto")
 209                        continue_merge
 210                        while test "$msgnum" -le "$end"
 211                        do
 212                                call_merge "$msgnum"
 213                                continue_merge
 214                        done
 215                        finish_rb_merge
 216                        exit
 217                fi
 218                head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
 219                onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
 220                orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
 221                git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
 222                move_to_original_branch
 223                exit
 224                ;;
 225        --skip)
 226                test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 227                        die "No rebase in progress?"
 228
 229                git reset --hard HEAD || exit $?
 230                if test -d "$dotest"
 231                then
 232                        git rerere clear
 233                        prev_head=$(cat "$dotest/prev_head")
 234                        end=$(cat "$dotest/end")
 235                        msgnum=$(cat "$dotest/msgnum")
 236                        msgnum=$(($msgnum + 1))
 237                        onto=$(cat "$dotest/onto")
 238                        while test "$msgnum" -le "$end"
 239                        do
 240                                call_merge "$msgnum"
 241                                continue_merge
 242                        done
 243                        finish_rb_merge
 244                        exit
 245                fi
 246                head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
 247                onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
 248                orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
 249                git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
 250                move_to_original_branch
 251                exit
 252                ;;
 253        --abort)
 254                test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 255                        die "No rebase in progress?"
 256
 257                git rerere clear
 258                if test -d "$dotest"
 259                then
 260                        move_to_original_branch
 261                else
 262                        dotest="$GIT_DIR"/rebase-apply
 263                        move_to_original_branch
 264                fi
 265                git reset --hard $(cat "$dotest/orig-head")
 266                rm -r "$dotest"
 267                exit
 268                ;;
 269        --onto)
 270                test 2 -le "$#" || usage
 271                newbase="$2"
 272                shift
 273                ;;
 274        -M|-m|--m|--me|--mer|--merg|--merge)
 275                do_merge=t
 276                ;;
 277        -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 278                --strateg=*|--strategy=*|\
 279        -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 280                case "$#,$1" in
 281                *,*=*)
 282                        strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 283                1,*)
 284                        usage ;;
 285                *)
 286                        strategy="$2"
 287                        shift ;;
 288                esac
 289                do_merge=t
 290                ;;
 291        -v|--verbose)
 292                verbose=t
 293                ;;
 294        --whitespace=*)
 295                git_am_opt="$git_am_opt $1"
 296                ;;
 297        -C*)
 298                git_am_opt="$git_am_opt $1"
 299                ;;
 300        -*)
 301                usage
 302                ;;
 303        *)
 304                break
 305                ;;
 306        esac
 307        shift
 308done
 309
 310# Make sure we do not have $GIT_DIR/rebase-apply
 311if test -z "$do_merge"
 312then
 313        if mkdir "$GIT_DIR"/rebase-apply 2>/dev/null
 314        then
 315                rmdir "$GIT_DIR"/rebase-apply
 316        else
 317                echo >&2 '
 318It seems that I cannot create a rebase-apply directory, and
 319I wonder if you are in the middle of patch application or another
 320rebase.  If that is not the case, please
 321        rm -fr '"$GIT_DIR"'/rebase-apply
 322and run me again.  I am stopping in case you still have something
 323valuable there.'
 324                exit 1
 325        fi
 326else
 327        if test -d "$dotest"
 328        then
 329                die "previous rebase directory $dotest still exists." \
 330                        'Try git rebase (--continue | --abort | --skip)'
 331        fi
 332fi
 333
 334# The tree must be really really clean.
 335if ! git update-index --ignore-submodules --refresh; then
 336        echo >&2 "cannot rebase: you have unstaged changes"
 337        exit 1
 338fi
 339diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
 340case "$diff" in
 341?*)     echo >&2 "cannot rebase: your index contains uncommitted changes"
 342        echo >&2 "$diff"
 343        exit 1
 344        ;;
 345esac
 346
 347# The upstream head must be given.  Make sure it is valid.
 348upstream_name="$1"
 349upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 350    die "invalid upstream $upstream_name"
 351
 352# Make sure the branch to rebase onto is valid.
 353onto_name=${newbase-"$upstream_name"}
 354onto=$(git rev-parse --verify "${onto_name}^0") || exit
 355
 356# If a hook exists, give it a chance to interrupt
 357run_pre_rebase_hook ${1+"$@"}
 358
 359# If the branch to rebase is given, that is the branch we will rebase
 360# $branch_name -- branch being rebased, or HEAD (already detached)
 361# $orig_head -- commit object name of tip of the branch before rebasing
 362# $head_name -- refs/heads/<that-branch> or "detached HEAD"
 363switch_to=
 364case "$#" in
 3652)
 366        # Is it "rebase other $branchname" or "rebase other $commit"?
 367        branch_name="$2"
 368        switch_to="$2"
 369
 370        if git show-ref --verify --quiet -- "refs/heads/$2" &&
 371           branch=$(git rev-parse -q --verify "refs/heads/$2")
 372        then
 373                head_name="refs/heads/$2"
 374        elif branch=$(git rev-parse -q --verify "$2")
 375        then
 376                head_name="detached HEAD"
 377        else
 378                usage
 379        fi
 380        ;;
 381*)
 382        # Do not need to switch branches, we are already on it.
 383        if branch_name=`git symbolic-ref -q HEAD`
 384        then
 385                head_name=$branch_name
 386                branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 387        else
 388                head_name="detached HEAD"
 389                branch_name=HEAD ;# detached
 390        fi
 391        branch=$(git rev-parse --verify "${branch_name}^0") || exit
 392        ;;
 393esac
 394orig_head=$branch
 395
 396# Now we are rebasing commits $upstream..$branch on top of $onto
 397
 398# Check if we are already based on $onto with linear history,
 399# but this should be done only when upstream and onto are the same.
 400mb=$(git merge-base "$onto" "$branch")
 401if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 402        # linear history?
 403        ! (git rev-list --parents "$onto".."$branch" | grep " .* ") > /dev/null
 404then
 405        # Lazily switch to the target branch if needed...
 406        test -z "$switch_to" || git checkout "$switch_to"
 407        echo >&2 "Current branch $branch_name is up to date."
 408        exit 0
 409fi
 410
 411if test -n "$verbose"
 412then
 413        echo "Changes from $mb to $onto:"
 414        # We want color (if set), but no pager
 415        GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 416fi
 417
 418# Detach HEAD and reset the tree
 419echo "First, rewinding head to replay your work on top of it..."
 420git checkout -q "$onto^0" || die "could not detach HEAD"
 421git update-ref ORIG_HEAD $branch
 422
 423# If the $onto is a proper descendant of the tip of the branch, then
 424# we just fast forwarded.
 425if test "$mb" = "$branch"
 426then
 427        echo >&2 "Fast-forwarded $branch_name to $onto_name."
 428        move_to_original_branch
 429        exit 0
 430fi
 431
 432if test -z "$do_merge"
 433then
 434        git format-patch -k --stdout --full-index --ignore-if-in-upstream \
 435                "$upstream..$orig_head" |
 436        git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
 437        move_to_original_branch
 438        ret=$?
 439        test 0 != $ret -a -d "$GIT_DIR"/rebase-apply &&
 440                echo $head_name > "$GIT_DIR"/rebase-apply/head-name &&
 441                echo $onto > "$GIT_DIR"/rebase-apply/onto &&
 442                echo $orig_head > "$GIT_DIR"/rebase-apply/orig-head
 443        exit $ret
 444fi
 445
 446# start doing a rebase with git-merge
 447# this is rename-aware if the recursive (default) strategy is used
 448
 449mkdir -p "$dotest"
 450echo "$onto" > "$dotest/onto"
 451echo "$onto_name" > "$dotest/onto_name"
 452prev_head=$orig_head
 453echo "$prev_head" > "$dotest/prev_head"
 454echo "$orig_head" > "$dotest/orig-head"
 455echo "$head_name" > "$dotest/head-name"
 456
 457msgnum=0
 458for cmt in `git rev-list --reverse --no-merges "$upstream..$orig_head"`
 459do
 460        msgnum=$(($msgnum + 1))
 461        echo "$cmt" > "$dotest/cmt.$msgnum"
 462done
 463
 464echo 1 >"$dotest/msgnum"
 465echo $msgnum >"$dotest/end"
 466
 467end=$msgnum
 468msgnum=1
 469
 470while test "$msgnum" -le "$end"
 471do
 472        call_merge "$msgnum"
 473        continue_merge
 474done
 475
 476finish_rb_merge