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-rw-r--r--sha1_name.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/sha1_name.c b/sha1_name.c
index be1755a..faac158 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -236,6 +236,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
NULL
};
const char **p;
+ int found = 0;
if (len == 40 && !get_sha1_hex(str, sha1))
return 0;
@@ -246,10 +247,20 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
for (p = prefix; *p; p++) {
char *pathname = git_path("%s/%.*s", *p, len, str);
- if (!read_ref(pathname, sha1))
- return 0;
+ if (!read_ref(pathname, sha1)) {
+ /* Must be unique; i.e. when heads/foo and
+ * tags/foo are both present, reject "foo".
+ * Note that read_ref() eventually calls
+ * get_sha1_hex() which can smudge initial
+ * part of the buffer even if what is read
+ * is found to be invalid halfway.
+ */
+ if (1 < found++)
+ return -1;
+ }
}
-
+ if (found == 1)
+ return 0;
return -1;
}