X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=git-merge.sh;h=d12a2a93b1408e7be6e9947737b4b09c5f0927fe;hb=79a9d8ea0d88a3667ad19be8e705405ab5d896f1;hp=413bfcae9ffdf3d4545235e8000d8545e42e5384;hpb=a935824036dc2c5a8ef1980a4b05a12228712754;p=git.git

diff --git a/git-merge.sh b/git-merge.sh
index 413bfcae..d12a2a93 100755
--- a/git-merge.sh
+++ b/git-merge.sh
@@ -19,18 +19,23 @@ default_strategies='resolve octopus'
 use_strategies=
 
 dropsave() {
-	rm -f -- "$GIT_DIR/MERGE_HEAD" \
+	rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
 		 "$GIT_DIR/MERGE_SAVE" || exit 1
 }
 
 savestate() {
-	git diff -r -z --name-only $head | cpio -0 -o >"$GIR_DIR/MERGE_SAVE"
+	# Stash away any local modifications.
+	git-diff-index -r -z --name-only $head |
+	cpio -0 -o >"$GIR_DIR/MERGE_SAVE"
 }
 
 restorestate() {
-	git reset --hard $head
-	cpio -iuv <"$GIT_DIR/MERGE_SAVE"
-	git-update-index --refresh >/dev/null
+        if test -f "$GIT_DIR/MERGE_SAVE"
+	then
+		git reset --hard $head
+		cpio -iuv <"$GIT_DIR/MERGE_SAVE"
+		git-update-index --refresh >/dev/null
+	fi
 }
 
 summary() {
@@ -111,16 +116,37 @@ case "$#,$common" in
 	# Again the most common case of merging one remote.
 	echo "Updating from $head to $1."
 	git-update-index --refresh 2>/dev/null
-	git-read-tree -u -m $head "$1" || exit 1
-	git-rev-parse --verify "$1^0" > "$GIT_DIR/HEAD"
+	git-read-tree -u -m $head "$1" &&
+	new_head=$(git-rev-parse --verify "$1^0") &&
+	git-update-ref HEAD "$new_head" "$head" || exit 1
 	summary "$1"
 	dropsave
 	exit 0
 	;;
-1,*)
+1,?*"$LF"?*)
 	# We are not doing octopus and not fast forward.  Need a
 	# real merge.
 	;;
+1,*)
+	# We are not doing octopus, not fast forward, and have only
+	# one common.  See if it is really trivial.
+	echo "Trying really trivial in-index merge..."
+	git-update-index --refresh 2>/dev/null
+	if git-read-tree --trivial -m -u $common $head "$1" &&
+	   result_tree=$(git-write-tree)
+	then
+	    echo "Wonderful."
+	    result_commit=$(
+	        echo "$merge_msg" |
+	        git-commit-tree $result_tree -p HEAD -p "$1"
+	    ) || exit
+	    git-update-ref HEAD $result_commit $head
+	    summary $result_commit
+	    dropsave
+	    exit 0
+	fi
+	echo "Nope."
+	;;
 *)
 	# An octopus.  If we can reach all the remote we are up to date.
 	up_to_date=t
@@ -146,12 +172,7 @@ esac
 # we use, it would operate on the index, possibly affecting the
 # working tree, and when resolved cleanly, have the desired tree
 # in the index -- this means that the index must be in sync with
-# the $head commit.
-files=$(git-diff-index --cached --name-only $head) || exit
-if [ "$files" ]; then
-   echo >&2 "Dirty index: cannot merge (dirty: $files)"
-   exit 1
-fi
+# the $head commit.  The strategies are responsible to ensure this.
 
 case "$use_strategies" in
 ?*' '?*)
@@ -160,6 +181,7 @@ case "$use_strategies" in
     single_strategy=no
     ;;
 *)
+    rm -f "$GIT_DIR/MERGE_SAVE"
     single_strategy=yes
     ;;
 esac
@@ -214,9 +236,9 @@ then
     do
         parents="$parents -p $remote"
     done
-    result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents)
+    result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents) || exit
     echo "Committed merge $result_commit, made by $wt_strategy."
-    echo $result_commit >"$GIT_DIR/HEAD"
+    git-update-ref HEAD $result_commit $head
     summary $result_commit
     dropsave
     exit 0
@@ -242,4 +264,6 @@ for remote
 do
 	echo $remote
 done >"$GIT_DIR/MERGE_HEAD"
+echo $merge_msg >"$GIT_DIR/MERGE_MSG"
+
 die "Automatic merge failed; fix up by hand"