blame: Fix git-blame <directory>

Before this patch git-blame <directory> gave non-sensible output. (It
assigned blame to some random file in <directory>) Abort with an error
message instead.

Signed-off-by: Fredrik Kuivinen <freku045@student.liu.se>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/blame.c b/blame.c
index 8af4b5430..9c97aeca4 100644
--- a/blame.c
+++ b/blame.c
@@ -180,11 +180,13 @@ static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
 				  unsigned mode, int stage);
 
 static unsigned char blob_sha1[20];
+static const char* blame_file;
 static int get_blob_sha1(struct tree *t, const char *pathname,
 			 unsigned char *sha1)
 {
 	int i;
 	const char *pathspec[2];
+	blame_file = pathname;
 	pathspec[0] = pathname;
 	pathspec[1] = NULL;
 	memset(blob_sha1, 0, sizeof(blob_sha1));
@@ -209,6 +211,10 @@ static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
 	if (S_ISDIR(mode))
 		return READ_TREE_RECURSIVE;
 
+	if (strncmp(blame_file, base, baselen) ||
+	    strcmp(blame_file + baselen, pathname))
+		return -1;
+
 	memcpy(blob_sha1, sha1, 20);
 	return -1;
 }