# Copyright (c) 2005 Junio C Hamano
#
+
+USAGE='[-n] [--no-commit] [-s <strategy>]... <merge-message> <head> <remote>+'
. git-sh-setup
LF='
'
-usage () {
- die "git-merge [-n] [--no-commit] [-s <strategy>]... <merge-message> <head> <remote>+"
-}
-
all_strategies='recursive octopus resolve stupid ours'
-default_strategies='recursive'
+default_twohead_strategies='recursive'
+default_octopus_strategies='octopus'
+no_trivial_merge_strategies='ours'
use_strategies=
+index_merge=t
+if test "@@NO_PYTHON@@"; then
+ all_strategies='resolve octopus stupid ours'
+ default_twohead_strategies='resolve'
+fi
+
dropsave() {
rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
"$GIT_DIR/MERGE_SAVE" || exit 1
shift
done
-test "$#" -le 2 && usage ;# we need at least two heads.
-
merge_msg="$1"
shift
head_arg="$1"
shift
# All the rest are remote heads
+test "$#" = 0 && usage ;# we need at least one remote head.
+
+remoteheads=
for remote
do
- git-rev-parse --verify "$remote"^0 >/dev/null ||
+ remotehead=$(git-rev-parse --verify "$remote"^0) ||
die "$remote - not something we can merge"
+ remoteheads="${remoteheads}$remotehead "
+done
+set x $remoteheads ; shift
+
+case "$use_strategies" in
+'')
+ case "$#" in
+ 1)
+ use_strategies="$default_twohead_strategies" ;;
+ *)
+ use_strategies="$default_octopus_strategies" ;;
+ esac
+ ;;
+esac
+
+for s in $use_strategies
+do
+ case " $s " in
+ *" $no_trivial_merge_strategies "*)
+ index_merge=f
+ break
+ ;;
+ esac
done
case "$#" in
esac
echo "$head" >"$GIT_DIR/ORIG_HEAD"
-case "$#,$common,$no_commit" in
-*,'',*)
+case "$index_merge,$#,$common,$no_commit" in
+f,*)
+ # We've been told not to try anything clever. Skip to real merge.
+ ;;
+?,*,'',*)
# No common ancestors found. We need a real merge.
;;
-1,"$1",*)
+?,1,"$1",*)
# If head can reach all the merge then we are up to date.
- # but first the most common case of merging one remote
+ # but first the most common case of merging one remote.
echo "Already up-to-date."
dropsave
exit 0
;;
-1,"$head",*)
+?,1,"$head",*)
# Again the most common case of merging one remote.
- echo "Updating from $head to $1."
+ echo "Updating from $head to $1"
git-update-index --refresh 2>/dev/null
new_head=$(git-rev-parse --verify "$1^0") &&
- git-read-tree -u -m $head "$new_head" &&
+ git-read-tree -u -v -m $head "$new_head" &&
finish "$new_head" "Fast forward"
dropsave
exit 0
;;
-1,?*"$LF"?*,*)
+?,1,?*"$LF"?*,*)
# We are not doing octopus and not fast forward. Need a
# real merge.
;;
-1,*,)
+?,1,*,)
# We are not doing octopus, not fast forward, and have only
# one common. See if it is really trivial.
+ git var GIT_COMMITTER_IDENT >/dev/null || exit
+
echo "Trying really trivial in-index merge..."
git-update-index --refresh 2>/dev/null
- if git-read-tree --trivial -m -u $common $head "$1" &&
+ if git-read-tree --trivial -m -u -v $common $head "$1" &&
result_tree=$(git-write-tree)
then
echo "Wonderful."
;;
esac
-case "$use_strategies" in
-'')
- case "$#" in
- 1)
- use_strategies="$default_strategies" ;;
- *)
- use_strategies=octopus ;;
- esac
- ;;
-esac
+# We are going to make a new commit.
+git var GIT_COMMITTER_IDENT >/dev/null || exit
# At this point, we need a real merge. No matter what strategy
# we use, it would operate on the index, possibly affecting the
esac
result_tree= best_cnt=-1 best_strategy= wt_strategy=
+merge_was_ok=
for strategy in $use_strategies
do
test "$wt_strategy" = '' || {
exit=$?
if test "$no_commit" = t && test "$exit" = 0
then
+ merge_was_ok=t
exit=1 ;# pretend it left conflicts.
fi
# auto resolved the merge cleanly.
if test '' != "$result_tree"
then
- parents="-p $head"
- for remote
- do
- parents="$parents -p $remote"
- done
+ parents=$(git-show-branch --independent "$head" "$@" | sed -e 's/^/-p /')
result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents) || exit
finish "$result_commit" "Merge $result_commit, made by $wt_strategy."
dropsave
case "$best_strategy" in
'')
restorestate
- die "No merge strategy handled the merge."
+ echo >&2 "No merge strategy handled the merge."
+ exit 2
;;
"$wt_strategy")
# We already have its result in the working tree.
do
echo $remote
done >"$GIT_DIR/MERGE_HEAD"
-echo $merge_msg >"$GIT_DIR/MERGE_MSG"
+echo "$merge_msg" >"$GIT_DIR/MERGE_MSG"
-die "Automatic merge failed/prevented; fix up by hand"
+if test "$merge_was_ok" = t
+then
+ echo >&2 \
+ "Automatic merge went well; stopped before committing as requested"
+ exit 0
+else
+ {
+ echo '
+Conflicts:
+'
+ git ls-files --unmerged |
+ sed -e 's/^[^ ]* / /' |
+ uniq
+ } >>"$GIT_DIR/MERGE_MSG"
+ if test -d "$GIT_DIR/rr-cache"
+ then
+ git-rerere
+ fi
+ die "Automatic merge failed; fix up by hand"
+fi