Andrew's git / gitweb.git / git-rebase.sh
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git-rebase.shon commit Merge branch 'np/compress-loose-object-memsave' into maint (035aa76)
   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Junio C Hamano.
   4#
   5
   6USAGE='[--interactive | -i] [-v] [--force-rebase | -f] [--onto <newbase>] [<upstream>|--root] [<branch>] [--quiet | -q]'
   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
  37LF='
  38'
  39OK_TO_SKIP_PRE_REBASE=
  40RESOLVEMSG="
  41When you have resolved this problem run \"git rebase --continue\".
  42If you would prefer to skip this patch, instead run \"git rebase --skip\".
  43To restore the original branch and stop rebasing run \"git rebase --abort\".
  44"
  45unset newbase
  46strategy=recursive
  47do_merge=
  48dotest="$GIT_DIR"/rebase-merge
  49prec=4
  50verbose=
  51diffstat=$(git config --bool rebase.stat)
  52git_am_opt=
  53rebase_root=
  54force_rebase=
  55allow_rerere_autoupdate=
  56
  57continue_merge () {
  58        test -n "$prev_head" || die "prev_head must be defined"
  59        test -d "$dotest" || die "$dotest directory does not exist"
  60
  61        unmerged=$(git ls-files -u)
  62        if test -n "$unmerged"
  63        then
  64                echo "You still have unmerged paths in your index"
  65                echo "did you forget to use git add?"
  66                die "$RESOLVEMSG"
  67        fi
  68
  69        cmt=`cat "$dotest/current"`
  70        if ! git diff-index --quiet --ignore-submodules HEAD --
  71        then
  72                if ! git commit --no-verify -C "$cmt"
  73                then
  74                        echo "Commit failed, please do not call \"git commit\""
  75                        echo "directly, but instead do one of the following: "
  76                        die "$RESOLVEMSG"
  77                fi
  78                if test -z "$GIT_QUIET"
  79                then
  80                        printf "Committed: %0${prec}d " $msgnum
  81                fi
  82        else
  83                if test -z "$GIT_QUIET"
  84                then
  85                        printf "Already applied: %0${prec}d " $msgnum
  86                fi
  87        fi
  88        test -z "$GIT_QUIET" &&
  89        GIT_PAGER='' git log --format=%s -1 "$cmt"
  90
  91        prev_head=`git rev-parse HEAD^0`
  92        # save the resulting commit so we can read-tree on it later
  93        echo "$prev_head" > "$dotest/prev_head"
  94
  95        # onto the next patch:
  96        msgnum=$(($msgnum + 1))
  97        echo "$msgnum" >"$dotest/msgnum"
  98}
  99
 100call_merge () {
 101        cmt="$(cat "$dotest/cmt.$1")"
 102        echo "$cmt" > "$dotest/current"
 103        hd=$(git rev-parse --verify HEAD)
 104        cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
 105        msgnum=$(cat "$dotest/msgnum")
 106        end=$(cat "$dotest/end")
 107        eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
 108        eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
 109        export GITHEAD_$cmt GITHEAD_$hd
 110        if test -n "$GIT_QUIET"
 111        then
 112                export GIT_MERGE_VERBOSITY=1
 113        fi
 114        git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
 115        rv=$?
 116        case "$rv" in
 117        0)
 118                unset GITHEAD_$cmt GITHEAD_$hd
 119                return
 120                ;;
 121        1)
 122                git rerere $allow_rerere_autoupdate
 123                die "$RESOLVEMSG"
 124                ;;
 125        2)
 126                echo "Strategy: $rv $strategy failed, try another" 1>&2
 127                die "$RESOLVEMSG"
 128                ;;
 129        *)
 130                die "Unknown exit code ($rv) from command:" \
 131                        "git-merge-$strategy $cmt^ -- HEAD $cmt"
 132                ;;
 133        esac
 134}
 135
 136move_to_original_branch () {
 137        test -z "$head_name" &&
 138                head_name="$(cat "$dotest"/head-name)" &&
 139                onto="$(cat "$dotest"/onto)" &&
 140                orig_head="$(cat "$dotest"/orig-head)"
 141        case "$head_name" in
 142        refs/*)
 143                message="rebase finished: $head_name onto $onto"
 144                git update-ref -m "$message" \
 145                        $head_name $(git rev-parse HEAD) $orig_head &&
 146                git symbolic-ref HEAD $head_name ||
 147                die "Could not move back to $head_name"
 148                ;;
 149        esac
 150}
 151
 152finish_rb_merge () {
 153        move_to_original_branch
 154        rm -r "$dotest"
 155        say All done.
 156}
 157
 158is_interactive () {
 159        while test $# != 0
 160        do
 161                case "$1" in
 162                        -i|--interactive)
 163                                interactive_rebase=explicit
 164                                break
 165                        ;;
 166                        -p|--preserve-merges)
 167                                interactive_rebase=implied
 168                        ;;
 169                esac
 170                shift
 171        done
 172
 173        if [ "$interactive_rebase" = implied ]; then
 174                GIT_EDITOR=:
 175                export GIT_EDITOR
 176        fi
 177
 178        test -n "$interactive_rebase" || test -f "$dotest"/interactive
 179}
 180
 181run_pre_rebase_hook () {
 182        if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 183           test -x "$GIT_DIR/hooks/pre-rebase"
 184        then
 185                "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
 186                die "The pre-rebase hook refused to rebase."
 187        fi
 188}
 189
 190test -f "$GIT_DIR"/rebase-apply/applying &&
 191        die 'It looks like git-am is in progress. Cannot rebase.'
 192
 193is_interactive "$@" && exec git-rebase--interactive "$@"
 194
 195if test $# -eq 0
 196then
 197        test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply || usage
 198        test -d "$dotest" -o -f "$GIT_DIR"/rebase-apply/rebasing &&
 199                die 'A rebase is in progress, try --continue, --skip or --abort.'
 200        die "No arguments given and $GIT_DIR/rebase-apply already exists."
 201fi
 202
 203while test $# != 0
 204do
 205        case "$1" in
 206        --no-verify)
 207                OK_TO_SKIP_PRE_REBASE=yes
 208                ;;
 209        --continue)
 210                test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 211                        die "No rebase in progress?"
 212
 213                git diff-files --quiet --ignore-submodules || {
 214                        echo "You must edit all merge conflicts and then"
 215                        echo "mark them as resolved using git add"
 216                        exit 1
 217                }
 218                if test -d "$dotest"
 219                then
 220                        prev_head=$(cat "$dotest/prev_head")
 221                        end=$(cat "$dotest/end")
 222                        msgnum=$(cat "$dotest/msgnum")
 223                        onto=$(cat "$dotest/onto")
 224                        GIT_QUIET=$(cat "$dotest/quiet")
 225                        continue_merge
 226                        while test "$msgnum" -le "$end"
 227                        do
 228                                call_merge "$msgnum"
 229                                continue_merge
 230                        done
 231                        finish_rb_merge
 232                        exit
 233                fi
 234                head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
 235                onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
 236                orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
 237                GIT_QUIET=$(cat "$GIT_DIR"/rebase-apply/quiet)
 238                git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
 239                move_to_original_branch
 240                exit
 241                ;;
 242        --skip)
 243                test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 244                        die "No rebase in progress?"
 245
 246                git reset --hard HEAD || exit $?
 247                if test -d "$dotest"
 248                then
 249                        git rerere clear
 250                        prev_head=$(cat "$dotest/prev_head")
 251                        end=$(cat "$dotest/end")
 252                        msgnum=$(cat "$dotest/msgnum")
 253                        msgnum=$(($msgnum + 1))
 254                        onto=$(cat "$dotest/onto")
 255                        GIT_QUIET=$(cat "$dotest/quiet")
 256                        while test "$msgnum" -le "$end"
 257                        do
 258                                call_merge "$msgnum"
 259                                continue_merge
 260                        done
 261                        finish_rb_merge
 262                        exit
 263                fi
 264                head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
 265                onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
 266                orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
 267                GIT_QUIET=$(cat "$GIT_DIR"/rebase-apply/quiet)
 268                git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
 269                move_to_original_branch
 270                exit
 271                ;;
 272        --abort)
 273                test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
 274                        die "No rebase in progress?"
 275
 276                git rerere clear
 277                if test -d "$dotest"
 278                then
 279                        GIT_QUIET=$(cat "$dotest/quiet")
 280                        move_to_original_branch
 281                else
 282                        dotest="$GIT_DIR"/rebase-apply
 283                        GIT_QUIET=$(cat "$dotest/quiet")
 284                        move_to_original_branch
 285                fi
 286                git reset --hard $(cat "$dotest/orig-head")
 287                rm -r "$dotest"
 288                exit
 289                ;;
 290        --onto)
 291                test 2 -le "$#" || usage
 292                newbase="$2"
 293                shift
 294                ;;
 295        -M|-m|--m|--me|--mer|--merg|--merge)
 296                do_merge=t
 297                ;;
 298        -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 299                --strateg=*|--strategy=*|\
 300        -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 301                case "$#,$1" in
 302                *,*=*)
 303                        strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 304                1,*)
 305                        usage ;;
 306                *)
 307                        strategy="$2"
 308                        shift ;;
 309                esac
 310                do_merge=t
 311                ;;
 312        -n|--no-stat)
 313                diffstat=
 314                ;;
 315        --stat)
 316                diffstat=t
 317                ;;
 318        -v|--verbose)
 319                verbose=t
 320                diffstat=t
 321                GIT_QUIET=
 322                ;;
 323        -q|--quiet)
 324                GIT_QUIET=t
 325                git_am_opt="$git_am_opt -q"
 326                verbose=
 327                diffstat=
 328                ;;
 329        --whitespace=*)
 330                git_am_opt="$git_am_opt $1"
 331                case "$1" in
 332                --whitespace=fix|--whitespace=strip)
 333                        force_rebase=t
 334                        ;;
 335                esac
 336                ;;
 337        --ignore-whitespace)
 338                git_am_opt="$git_am_opt $1"
 339                ;;
 340        --committer-date-is-author-date|--ignore-date)
 341                git_am_opt="$git_am_opt $1"
 342                force_rebase=t
 343                ;;
 344        -C*)
 345                git_am_opt="$git_am_opt $1"
 346                ;;
 347        --root)
 348                rebase_root=t
 349                ;;
 350        -f|--f|--fo|--for|--forc|force|--force-r|--force-re|--force-reb|--force-reba|--force-rebas|--force-rebase)
 351                force_rebase=t
 352                ;;
 353        --rerere-autoupdate|--no-rerere-autoupdate)
 354                allow_rerere_autoupdate="$1"
 355                ;;
 356        -*)
 357                usage
 358                ;;
 359        *)
 360                break
 361                ;;
 362        esac
 363        shift
 364done
 365test $# -gt 2 && usage
 366
 367# Make sure we do not have $GIT_DIR/rebase-apply
 368if test -z "$do_merge"
 369then
 370        if mkdir "$GIT_DIR"/rebase-apply 2>/dev/null
 371        then
 372                rmdir "$GIT_DIR"/rebase-apply
 373        else
 374                echo >&2 '
 375It seems that I cannot create a rebase-apply directory, and
 376I wonder if you are in the middle of patch application or another
 377rebase.  If that is not the case, please
 378        rm -fr '"$GIT_DIR"'/rebase-apply
 379and run me again.  I am stopping in case you still have something
 380valuable there.'
 381                exit 1
 382        fi
 383else
 384        if test -d "$dotest"
 385        then
 386                die "previous rebase directory $dotest still exists." \
 387                        'Try git rebase (--continue | --abort | --skip)'
 388        fi
 389fi
 390
 391# The tree must be really really clean.
 392if ! git update-index --ignore-submodules --refresh > /dev/null; then
 393        echo >&2 "cannot rebase: you have unstaged changes"
 394        git diff-files --name-status -r --ignore-submodules -- >&2
 395        exit 1
 396fi
 397diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
 398case "$diff" in
 399?*)     echo >&2 "cannot rebase: your index contains uncommitted changes"
 400        echo >&2 "$diff"
 401        exit 1
 402        ;;
 403esac
 404
 405if test -z "$rebase_root"
 406then
 407        # The upstream head must be given.  Make sure it is valid.
 408        upstream_name="$1"
 409        shift
 410        upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 411        die "invalid upstream $upstream_name"
 412        unset root_flag
 413        upstream_arg="$upstream_name"
 414else
 415        test -z "$newbase" && die "--root must be used with --onto"
 416        unset upstream_name
 417        unset upstream
 418        root_flag="--root"
 419        upstream_arg="$root_flag"
 420fi
 421
 422# Make sure the branch to rebase onto is valid.
 423onto_name=${newbase-"$upstream_name"}
 424case "$onto_name" in
 425*...*)
 426        if      left=${onto_name%...*} right=${onto_name#*...} &&
 427                onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 428        then
 429                case "$onto" in
 430                ?*"$LF"?*)
 431                        die "$onto_name: there are more than one merge bases"
 432                        ;;
 433                '')
 434                        die "$onto_name: there is no merge base"
 435                        ;;
 436                esac
 437        else
 438                die "$onto_name: there is no merge base"
 439        fi
 440        ;;
 441*)
 442        onto=$(git rev-parse --verify "${onto_name}^0") || exit
 443        ;;
 444esac
 445
 446# If a hook exists, give it a chance to interrupt
 447run_pre_rebase_hook "$upstream_arg" "$@"
 448
 449# If the branch to rebase is given, that is the branch we will rebase
 450# $branch_name -- branch being rebased, or HEAD (already detached)
 451# $orig_head -- commit object name of tip of the branch before rebasing
 452# $head_name -- refs/heads/<that-branch> or "detached HEAD"
 453switch_to=
 454case "$#" in
 4551)
 456        # Is it "rebase other $branchname" or "rebase other $commit"?
 457        branch_name="$1"
 458        switch_to="$1"
 459
 460        if git show-ref --verify --quiet -- "refs/heads/$1" &&
 461           branch=$(git rev-parse -q --verify "refs/heads/$1")
 462        then
 463                head_name="refs/heads/$1"
 464        elif branch=$(git rev-parse -q --verify "$1")
 465        then
 466                head_name="detached HEAD"
 467        else
 468                usage
 469        fi
 470        ;;
 471*)
 472        # Do not need to switch branches, we are already on it.
 473        if branch_name=`git symbolic-ref -q HEAD`
 474        then
 475                head_name=$branch_name
 476                branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 477        else
 478                head_name="detached HEAD"
 479                branch_name=HEAD ;# detached
 480        fi
 481        branch=$(git rev-parse --verify "${branch_name}^0") || exit
 482        ;;
 483esac
 484orig_head=$branch
 485
 486# Now we are rebasing commits $upstream..$branch (or with --root,
 487# everything leading up to $branch) on top of $onto
 488
 489# Check if we are already based on $onto with linear history,
 490# but this should be done only when upstream and onto are the same.
 491mb=$(git merge-base "$onto" "$branch")
 492if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 493        # linear history?
 494        ! (git rev-list --parents "$onto".."$branch" | sane_grep " .* ") > /dev/null
 495then
 496        if test -z "$force_rebase"
 497        then
 498                # Lazily switch to the target branch if needed...
 499                test -z "$switch_to" || git checkout "$switch_to"
 500                say "Current branch $branch_name is up to date."
 501                exit 0
 502        else
 503                say "Current branch $branch_name is up to date, rebase forced."
 504        fi
 505fi
 506
 507# Detach HEAD and reset the tree
 508say "First, rewinding head to replay your work on top of it..."
 509git checkout -q "$onto^0" || die "could not detach HEAD"
 510git update-ref ORIG_HEAD $branch
 511
 512if test -n "$diffstat"
 513then
 514        if test -n "$verbose"
 515        then
 516                echo "Changes from $mb to $onto:"
 517        fi
 518        # We want color (if set), but no pager
 519        GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 520fi
 521
 522# If the $onto is a proper descendant of the tip of the branch, then
 523# we just fast-forwarded.
 524if test "$mb" = "$branch"
 525then
 526        say "Fast-forwarded $branch_name to $onto_name."
 527        move_to_original_branch
 528        exit 0
 529fi
 530
 531if test -n "$rebase_root"
 532then
 533        revisions="$onto..$orig_head"
 534else
 535        revisions="$upstream..$orig_head"
 536fi
 537
 538if test -z "$do_merge"
 539then
 540        git format-patch -k --stdout --full-index --ignore-if-in-upstream \
 541                $root_flag "$revisions" |
 542        git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
 543        move_to_original_branch
 544        ret=$?
 545        test 0 != $ret -a -d "$GIT_DIR"/rebase-apply &&
 546                echo $head_name > "$GIT_DIR"/rebase-apply/head-name &&
 547                echo $onto > "$GIT_DIR"/rebase-apply/onto &&
 548                echo $orig_head > "$GIT_DIR"/rebase-apply/orig-head &&
 549                echo "$GIT_QUIET" > "$GIT_DIR"/rebase-apply/quiet
 550        exit $ret
 551fi
 552
 553# start doing a rebase with git-merge
 554# this is rename-aware if the recursive (default) strategy is used
 555
 556mkdir -p "$dotest"
 557echo "$onto" > "$dotest/onto"
 558echo "$onto_name" > "$dotest/onto_name"
 559prev_head=$orig_head
 560echo "$prev_head" > "$dotest/prev_head"
 561echo "$orig_head" > "$dotest/orig-head"
 562echo "$head_name" > "$dotest/head-name"
 563echo "$GIT_QUIET" > "$dotest/quiet"
 564
 565msgnum=0
 566for cmt in `git rev-list --reverse --no-merges "$revisions"`
 567do
 568        msgnum=$(($msgnum + 1))
 569        echo "$cmt" > "$dotest/cmt.$msgnum"
 570done
 571
 572echo 1 >"$dotest/msgnum"
 573echo $msgnum >"$dotest/end"
 574
 575end=$msgnum
 576msgnum=1
 577
 578while test "$msgnum" -le "$end"
 579do
 580        call_merge "$msgnum"
 581        continue_merge
 582done
 583
 584finish_rb_merge