git-describe: really prefer tags only.

Often there are references other than annotated tags under
refs/tags hierarchy that are used to "keep things just in case".
default to use annotated tags only, still leaving the option to
use any ref with --all flag.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/describe.c b/describe.c
index ebfa429..e1b6588 100644 (file)
--- a/describe.c
+++ b/describe.c
@@ -1,12 +1,13 @@
 #include "cache.h"
 #include "commit.h"
+#include "tag.h"
 #include "refs.h"
 
 #define SEEN (1u << 0)
 
 static const char describe_usage[] = "git-describe [--all] <committish>*";
 
-static int all = 0;    /* Default to tags only */
+static int all = 0;    /* Default to annotated tags only */
 
 static int names = 0, allocs = 0;
 static struct commit_name {
@@ -49,9 +50,15 @@ static int get_name(const char *path, const unsigned char *sha1)
        struct commit *commit = lookup_commit_reference_gently(sha1, 1);
        if (!commit)
                return 0;
-       if (!all && strncmp(path, "refs/tags/", 10))
-               return 0;
-       add_to_known_names(path, commit);
+       if (!all) {
+               struct object *object;
+               if (strncmp(path, "refs/tags/", 10))
+                       return 0;
+               object = parse_object(sha1);
+               if (object->type != tag_type)
+                       return 0;
+       }
+       add_to_known_names(all ? path : path + 10, commit);
        return 0;
 }