mergetool: support delete/delete conflicts

If two branches each move a file into different directories then
mergetool will fail because it assumes that the file being merged, and
its parent directory, are present in the worktree.

Create the merge file's parent directory to allow using the
deleted base version of the file for merge resolution when
encountering a delete/delete conflict.

The end result is that a delete/delete conflict is presented for the
user to resolve.

Reported-by: Joe Einertson <joe@kidblog.org>
Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/git-mergetool.sh b/git-mergetool.sh
index 9f77e3a8bb..b06ae78739 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -282,8 +282,14 @@ merge_file () {
 		return
 	fi
 
-	mv -- "$MERGED" "$BACKUP"
-	cp -- "$BACKUP" "$MERGED"
+	if test -f "$MERGED"
+	then
+		mv -- "$MERGED" "$BACKUP"
+		cp -- "$BACKUP" "$MERGED"
+	fi
+	# Create a parent directory to handle delete/delete conflicts
+	# where the base's directory no longer exists.
+	mkdir -p "$(dirname "$MERGED")"
 
 	checkout_staged_file 1 "$MERGED" "$BASE"
 	checkout_staged_file 2 "$MERGED" "$LOCAL"
@@ -295,7 +301,9 @@ merge_file () {
 		describe_file "$local_mode" "local" "$LOCAL"
 		describe_file "$remote_mode" "remote" "$REMOTE"
 		resolve_deleted_merge
-		return
+		status=$?
+		rmdir -p "$(dirname "$MERGED")" 2>/dev/null
+		return $status
 	fi
 
 	if is_symlink "$local_mode" || is_symlink "$remote_mode"