1 files changed, 4 insertions, 0 deletions
diff --git a/cache.h b/cache.h
index af7740258..c7382996f 100644
--- a/cache.h
+++ b/cache.h
@@ -210,6 +210,10 @@ extern char *sha1_pack_name(const unsigned char *sha1);
 extern char *sha1_pack_index_name(const unsigned char *sha1);
 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 extern const unsigned char null_sha1[20];
+static inline int is_null_sha1(const unsigned char *sha1)
+{
+	return !memcmp(sha1, null_sha1, 20);
+}
 
 int git_mkstemp(char *path, size_t n, const char *template);