git/git-rebase.sh
Shawn O. Pearce 0bb733c91c Use branch names in 'git-rebase -m' conflict hunks.
If a three-way merge in git-rebase generates a conflict then we
should take advantage of git-merge-recursive's ability to include
the branch name of each side of the conflict hunk by setting the
GITHEAD_* environment variables.

In the case of rebase there aren't really two clear branches; we
have the branch we are rebasing onto, and we have the branch we are
currently rebasing.  Since most conflicts will be arising between
the user's current branch and the branch they are rebasing onto
we assume the stuff that isn't in the current commit is the "onto"
branch and the stuff in the current commit is the "current" branch.

This assumption may however come up wrong if the user resolves one
conflict in such a way that it conflicts again on a future commit
also being rebased.  In this case the user's prior resolution will
appear to be in the "onto" part of the hunk.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-12-28 01:07:32 -08:00

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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano.
#
USAGE='[-v] [--onto <newbase>] <upstream> [<branch>]'
LONG_USAGE='git-rebase replaces <branch> with a new branch of the
same name. When the --onto option is provided the new branch starts
out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
It then attempts to create a new commit for each commit from the original
<branch> that does not exist in the <upstream> branch.
It is possible that a merge failure will prevent this process from being
completely automatic. You will have to resolve any such merge failure
and run git rebase --continue. Another option is to bypass the commit
that caused the merge failure with git rebase --skip. To restore the
original <branch> and remove the .dotest working files, use the command
git rebase --abort instead.
Note that if <branch> is not specified on the command line, the
currently checked out branch is used. You must be in the top
directory of your project to start (or continue) a rebase.
Example: git-rebase master~1 topic
A---B---C topic A'\''--B'\''--C'\'' topic
/ --> /
D---E---F---G master D---E---F---G master
'
. git-sh-setup
set_reflog_action rebase
RESOLVEMSG="
When you have resolved this problem run \"git rebase --continue\".
If you would prefer to skip this patch, instead run \"git rebase --skip\".
To restore the original branch and stop rebasing run \"git rebase --abort\".
"
unset newbase
strategy=recursive
do_merge=
dotest=$GIT_DIR/.dotest-merge
prec=4
verbose=
continue_merge () {
test -n "$prev_head" || die "prev_head must be defined"
test -d "$dotest" || die "$dotest directory does not exist"
unmerged=$(git-ls-files -u)
if test -n "$unmerged"
then
echo "You still have unmerged paths in your index"
echo "did you forget update-index?"
die "$RESOLVEMSG"
fi
if test -n "`git-diff-index HEAD`"
then
if ! git-commit -C "`cat $dotest/current`"
then
echo "Commit failed, please do not call \"git commit\""
echo "directly, but instead do one of the following: "
die "$RESOLVEMSG"
fi
printf "Committed: %0${prec}d" $msgnum
else
printf "Already applied: %0${prec}d" $msgnum
fi
echo ' '`git-rev-list --pretty=oneline -1 HEAD | \
sed 's/^[a-f0-9]\+ //'`
prev_head=`git-rev-parse HEAD^0`
# save the resulting commit so we can read-tree on it later
echo "$prev_head" > "$dotest/prev_head"
# onto the next patch:
msgnum=$(($msgnum + 1))
echo "$msgnum" >"$dotest/msgnum"
}
call_merge () {
cmt="$(cat $dotest/cmt.$1)"
echo "$cmt" > "$dotest/current"
hd=$(git-rev-parse --verify HEAD)
cmt_name=$(git-symbolic-ref HEAD)
msgnum=$(cat $dotest/msgnum)
end=$(cat $dotest/end)
eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
eval GITHEAD_$hd='"$(cat $dotest/onto_name)"'
export GITHEAD_$cmt GITHEAD_$hd
git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
rv=$?
case "$rv" in
0)
unset GITHEAD_$cmt GITHEAD_$hd
return
;;
1)
test -d "$GIT_DIR/rr-cache" && git-rerere
die "$RESOLVEMSG"
;;
2)
echo "Strategy: $rv $strategy failed, try another" 1>&2
die "$RESOLVEMSG"
;;
*)
die "Unknown exit code ($rv) from command:" \
"git-merge-$strategy $cmt^ -- HEAD $cmt"
;;
esac
}
finish_rb_merge () {
rm -r "$dotest"
echo "All done."
}
while case "$#" in 0) break ;; esac
do
case "$1" in
--continue)
diff=$(git-diff-files)
case "$diff" in
?*) echo "You must edit all merge conflicts and then"
echo "mark them as resolved using git update-index"
exit 1
;;
esac
if test -d "$dotest"
then
prev_head="`cat $dotest/prev_head`"
end="`cat $dotest/end`"
msgnum="`cat $dotest/msgnum`"
onto="`cat $dotest/onto`"
continue_merge
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
fi
git am --resolved --3way --resolvemsg="$RESOLVEMSG"
exit
;;
--skip)
if test -d "$dotest"
then
if test -d "$GIT_DIR/rr-cache"
then
git-rerere clear
fi
prev_head="`cat $dotest/prev_head`"
end="`cat $dotest/end`"
msgnum="`cat $dotest/msgnum`"
msgnum=$(($msgnum + 1))
onto="`cat $dotest/onto`"
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
fi
git am -3 --skip --resolvemsg="$RESOLVEMSG"
exit
;;
--abort)
if test -d "$GIT_DIR/rr-cache"
then
git-rerere clear
fi
if test -d "$dotest"
then
rm -r "$dotest"
elif test -d .dotest
then
rm -r .dotest
else
die "No rebase in progress?"
fi
git reset --hard ORIG_HEAD
exit
;;
--onto)
test 2 -le "$#" || usage
newbase="$2"
shift
;;
-M|-m|--m|--me|--mer|--merg|--merge)
do_merge=t
;;
-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
--strateg=*|--strategy=*|\
-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
case "$#,$1" in
*,*=*)
strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
1,*)
usage ;;
*)
strategy="$2"
shift ;;
esac
do_merge=t
;;
-v|--verbose)
verbose=t
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
# Make sure we do not have .dotest
if test -z "$do_merge"
then
if mkdir .dotest
then
rmdir .dotest
else
echo >&2 '
It seems that I cannot create a .dotest directory, and I wonder if you
are in the middle of patch application or another rebase. If that is not
the case, please rm -fr .dotest and run me again. I am stopping in case
you still have something valuable there.'
exit 1
fi
else
if test -d "$dotest"
then
die "previous dotest directory $dotest still exists." \
'try git-rebase < --continue | --abort >'
fi
fi
# The tree must be really really clean.
git-update-index --refresh || exit
diff=$(git-diff-index --cached --name-status -r HEAD)
case "$diff" in
?*) echo "$diff"
exit 1
;;
esac
# The upstream head must be given. Make sure it is valid.
upstream_name="$1"
upstream=`git rev-parse --verify "${upstream_name}^0"` ||
die "invalid upstream $upstream_name"
# If a hook exists, give it a chance to interrupt
if test -x "$GIT_DIR/hooks/pre-rebase"
then
"$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
echo >&2 "The pre-rebase hook refused to rebase."
exit 1
}
fi
# If the branch to rebase is given, first switch to it.
case "$#" in
2)
branch_name="$2"
git-checkout "$2" || usage
;;
*)
branch_name=`git symbolic-ref HEAD` || die "No current branch"
branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
;;
esac
branch=$(git-rev-parse --verify "${branch_name}^0") || exit
# Make sure the branch to rebase onto is valid.
onto_name=${newbase-"$upstream_name"}
onto=$(git-rev-parse --verify "${onto_name}^0") || exit
# Now we are rebasing commits $upstream..$branch on top of $onto
# Check if we are already based on $onto, but this should be
# done only when upstream and onto are the same.
mb=$(git-merge-base "$onto" "$branch")
if test "$upstream" = "$onto" && test "$mb" = "$onto"
then
echo >&2 "Current branch $branch_name is up to date."
exit 0
fi
if test -n "$verbose"
then
echo "Changes from $mb to $onto:"
git-diff-tree --stat --summary "$mb" "$onto"
fi
# Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
echo "First, rewinding head to replay your work on top of it..."
git-reset --hard "$onto"
# If the $onto is a proper descendant of the tip of the branch, then
# we just fast forwarded.
if test "$mb" = "$branch"
then
echo >&2 "Fast-forwarded $branch_name to $onto_name."
exit 0
fi
if test -z "$do_merge"
then
git-format-patch -k --stdout --full-index --ignore-if-in-upstream "$upstream"..ORIG_HEAD |
git am --binary -3 -k --resolvemsg="$RESOLVEMSG"
exit $?
fi
# start doing a rebase with git-merge
# this is rename-aware if the recursive (default) strategy is used
mkdir -p "$dotest"
echo "$onto" > "$dotest/onto"
echo "$onto_name" > "$dotest/onto_name"
prev_head=`git-rev-parse HEAD^0`
echo "$prev_head" > "$dotest/prev_head"
msgnum=0
for cmt in `git-rev-list --no-merges "$upstream"..ORIG_HEAD \
| @@PERL@@ -e 'print reverse <>'`
do
msgnum=$(($msgnum + 1))
echo "$cmt" > "$dotest/cmt.$msgnum"
done
echo 1 >"$dotest/msgnum"
echo $msgnum >"$dotest/end"
end=$msgnum
msgnum=1
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge