rebase: Allow merge strategies to be used when rebasing
This solves the problem of rebasing local commits against an upstream that has renamed files. Signed-off-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Junio C Hamano <junkio@cox.net>maint
Eric Wong
Junio C Hamano
parent
86f660b1f1
commit
58634dbff8
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@ -7,7 +7,7 @@ git-rebase - Rebase local commits to a new head
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SYNOPSIS
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--------
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'git-rebase' [--onto <newbase>] <upstream> [<branch>]
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'git-rebase' [--merge] [--onto <newbase>] <upstream> [<branch>]
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'git-rebase' --continue | --skip | --abort
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@ -106,6 +106,24 @@ OPTIONS
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--abort::
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Restore the original branch and abort the rebase operation.
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--skip::
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Restart the rebasing process by skipping the current patch.
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This does not work with the --merge option.
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--merge::
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Use merging strategies to rebase. When the recursive (default) merge
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strategy is used, this allows rebase to be aware of renames on the
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upstream side.
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-s <strategy>, \--strategy=<strategy>::
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Use the given merge strategy; can be supplied more than
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once to specify them in the order they should be tried.
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If there is no `-s` option, a built-in list of strategies
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is used instead (`git-merge-recursive` when merging a single
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head, `git-merge-octopus` otherwise). This implies --merge.
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include::merge-strategies.txt[]
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NOTES
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-----
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When you rebase a branch, you are changing its history in a way that
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186
git-rebase.sh
186
git-rebase.sh
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@ -34,7 +34,96 @@ When you have resolved this problem run \"git rebase --continue\".
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If you would prefer to skip this patch, instead run \"git rebase --skip\".
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To restore the original branch and stop rebasing run \"git rebase --abort\".
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"
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MRESOLVEMSG="
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When you have resolved this problem run \"git rebase --continue\".
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To restore the original branch and stop rebasing run \"git rebase --abort\".
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"
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unset newbase
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strategy=recursive
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do_merge=
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dotest=$GIT_DIR/.dotest-merge
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prec=4
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continue_merge () {
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test -n "$prev_head" || die "prev_head must be defined"
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test -d "$dotest" || die "$dotest directory does not exist"
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unmerged=$(git-ls-files -u)
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if test -n "$unmerged"
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then
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echo "You still have unmerged paths in your index"
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echo "did you forget update-index?"
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die "$MRESOLVEMSG"
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fi
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if test -n "`git-diff-index HEAD`"
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then
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git-commit -C "`cat $dotest/current`"
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else
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echo "Previous merge succeeded automatically"
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fi
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prev_head=`git-rev-parse HEAD^0`
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# save the resulting commit so we can read-tree on it later
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echo "$prev_head" > "$dotest/`printf %0${prec}d $msgnum`.result"
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echo "$prev_head" > "$dotest/prev_head"
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# onto the next patch:
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msgnum=$(($msgnum + 1))
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printf "%0${prec}d" "$msgnum" > "$dotest/msgnum"
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}
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call_merge () {
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cmt="$(cat $dotest/`printf %0${prec}d $1`)"
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echo "$cmt" > "$dotest/current"
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git-merge-$strategy "$cmt^" -- HEAD "$cmt"
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rv=$?
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case "$rv" in
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0)
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git-commit -C "$cmt" || die "commit failed: $MRESOLVEMSG"
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;;
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1)
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test -d "$GIT_DIR/rr-cache" && git-rerere
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die "$MRESOLVEMSG"
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;;
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2)
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echo "Strategy: $rv $strategy failed, try another" 1>&2
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die "$MRESOLVEMSG"
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;;
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*)
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die "Unknown exit code ($rv) from command:" \
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"git-merge-$strategy $cmt^ -- HEAD $cmt"
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;;
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esac
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}
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finish_rb_merge () {
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set -e
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msgnum=1
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echo "Finalizing rebased commits..."
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git-reset --hard "`cat $dotest/onto`"
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end="`cat $dotest/end`"
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while test "$msgnum" -le "$end"
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do
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msgnum=`printf "%0${prec}d" "$msgnum"`
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printf "%0${prec}d" "$msgnum" > "$dotest/msgnum"
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git-read-tree `cat "$dotest/$msgnum.result"`
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git-checkout-index -q -f -u -a
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git-commit -C "`cat $dotest/$msgnum`"
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echo "Committed $msgnum"
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echo ' '`git-rev-list --pretty=oneline -1 HEAD | \
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sed 's/^[a-f0-9]\+ //'`
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msgnum=$(($msgnum + 1))
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done
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rm -r "$dotest"
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echo "All done."
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}
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while case "$#" in 0) break ;; esac
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do
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case "$1" in
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@ -46,17 +135,43 @@ do
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exit 1
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;;
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esac
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if test -d "$dotest"
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then
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prev_head="`cat $dotest/prev_head`"
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end="`cat $dotest/end`"
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msgnum="`cat $dotest/msgnum`"
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onto="`cat $dotest/onto`"
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continue_merge
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while test "$msgnum" -le "$end"
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do
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call_merge "$msgnum"
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continue_merge
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done
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finish_rb_merge
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exit
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fi
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git am --resolved --3way --resolvemsg="$RESOLVEMSG"
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exit
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;;
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--skip)
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if test -d "$dotest"
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then
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die "--skip is not supported when using --merge"
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fi
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git am -3 --skip --resolvemsg="$RESOLVEMSG"
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exit
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;;
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--abort)
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[ -d .dotest ] || die "No rebase in progress?"
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git reset --hard ORIG_HEAD
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if test -d "$dotest"
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then
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rm -r "$dotest"
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elif test -d .dotest
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then
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rm -r .dotest
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else
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die "No rebase in progress?"
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fi
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git reset --hard ORIG_HEAD
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exit
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;;
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--onto)
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@ -64,6 +179,23 @@ do
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newbase="$2"
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shift
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;;
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-M|-m|--m|--me|--mer|--merg|--merge)
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do_merge=t
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;;
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-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
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--strateg=*|--strategy=*|\
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-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
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case "$#,$1" in
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*,*=*)
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strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
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1,*)
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usage ;;
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*)
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strategy="$2"
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shift ;;
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esac
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do_merge=t
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;;
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-*)
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usage
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;;
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@ -75,16 +207,25 @@ do
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done
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# Make sure we do not have .dotest
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if mkdir .dotest
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if test -z "$do_merge"
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then
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if mkdir .dotest
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then
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rmdir .dotest
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else
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else
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echo >&2 '
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It seems that I cannot create a .dotest directory, and I wonder if you
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are in the middle of patch application or another rebase. If that is not
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the case, please rm -fr .dotest and run me again. I am stopping in case
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you still have something valuable there.'
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exit 1
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fi
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else
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if test -d "$dotest"
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then
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die "previous dotest directory $dotest still exists." \
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'try git-rebase < --continue | --abort >'
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fi
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fi
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# The tree must be really really clean.
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@ -152,6 +293,39 @@ then
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exit 0
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fi
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git-format-patch -k --stdout --full-index "$upstream"..ORIG_HEAD |
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git am --binary -3 -k --resolvemsg="$RESOLVEMSG"
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if test -z "$do_merge"
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then
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git-format-patch -k --stdout --full-index "$upstream"..ORIG_HEAD |
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git am --binary -3 -k --resolvemsg="$RESOLVEMSG"
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exit $?
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fi
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# start doing a rebase with git-merge
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# this is rename-aware if the recursive (default) strategy is used
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mkdir -p "$dotest"
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echo "$onto" > "$dotest/onto"
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prev_head=`git-rev-parse HEAD^0`
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echo "$prev_head" > "$dotest/prev_head"
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msgnum=0
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for cmt in `git-rev-list --no-merges "$upstream"..ORIG_HEAD \
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| perl -e 'print reverse <>'`
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do
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msgnum=$(($msgnum + 1))
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echo "$cmt" > "$dotest/`printf "%0${prec}d" $msgnum`"
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done
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printf "%0${prec}d" 1 > "$dotest/msgnum"
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printf "%0${prec}d" "$msgnum" > "$dotest/end"
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end=$msgnum
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msgnum=1
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while test "$msgnum" -le "$end"
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do
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call_merge "$msgnum"
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continue_merge
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done
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finish_rb_merge
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