Teach git-describe to verify annotated tag names before output

If an annotated tag describes a commit we want to favor the name
listed in the body of the tag, rather than whatever name it has
been stored under locally.  By doing so it is easier to converse
about tags with others, even if the tags happen to be fetched to
a different name than it was given by its creator.

To avoid confusion when a tag is stored under a different name
(and thus is not readable via git-rev-parse --verify, etc.) we show
a warning message if the name of the tag does not match the ref
we found it under and if that tag was also selected for output.
For example:

  $ git tag -a -m "i am a test" testtag
  $ mv .git/refs/tags/testtag .git/refs/tags/bobbytag

  $ ./git-describe HEAD
  warning: tag 'testtag' is really 'bobbytag' here
  testtag

  $ git tag -d testtag
  error: tag 'testtag' not found.
  $ git tag -d bobbytag
  Deleted tag 'bobbytag'

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-describe.c

@@ -22,7 +22,9 @@ static int max_candidates = 10;
 const char *pattern = NULL;
 
 struct commit_name {
+	struct tag *tag;
 	int prio; /* annotated tag = 2, tag = 1, head = 0 */
+	unsigned char sha1[20];
 	char path[FLEX_ARRAY]; /* more */
 };
 static const char *prio_names[] = {
@@ -31,14 +33,17 @@ static const char *prio_names[] = {
 
 static void add_to_known_names(const char *path,
 			       struct commit *commit,
-			       int prio)
+			       int prio,
+			       const unsigned char *sha1)
 {
 	struct commit_name *e = commit->util;
 	if (!e || e->prio < prio) {
 		size_t len = strlen(path)+1;
 		free(e);
 		e = xmalloc(sizeof(struct commit_name) + len);
+		e->tag = NULL;
 		e->prio = prio;
+		hashcpy(e->sha1, sha1);
 		memcpy(e->path, path, len);
 		commit->util = e;
 	}
@@ -89,7 +94,7 @@ static int get_name(const char *path, const unsigned char *sha1, int flag, void
 		if (!tags && prio < 2)
 			return 0;
 	}
-	add_to_known_names(all ? path + 5 : path + 10, commit, prio);
+	add_to_known_names(all ? path + 5 : path + 10, commit, prio, sha1);
 	return 0;
 }
 
@@ -146,6 +151,22 @@ static unsigned long finish_depth_computation(
 	return seen_commits;
 }
 
+static void display_name(struct commit_name *n)
+{
+	if (n->prio == 2 && !n->tag) {
+		n->tag = lookup_tag(n->sha1);
+		if (!n->tag || !n->tag->tag)
+			die("annotated tag %s not available", n->path);
+		if (strcmp(n->tag->tag, n->path))
+			warning("tag '%s' is really '%s' here", n->tag->tag, n->path);
+	}
+
+	if (n->tag)
+		printf("%s", n->tag->tag);
+	else
+		printf("%s", n->path);
+}
+
 static void describe(const char *arg, int last_one)
 {
 	unsigned char sha1[20];
@@ -170,7 +191,8 @@ static void describe(const char *arg, int last_one)
 
 	n = cmit->util;
 	if (n) {
-		printf("%s\n", n->path);
+		display_name(n);
+		printf("\n");
 		return;
 	}
 
@@ -252,12 +274,12 @@ static void describe(const char *arg, int last_one)
 				sha1_to_hex(gave_up_on->object.sha1));
 		}
 	}
-	if (abbrev == 0)
-		printf("%s\n", all_matches[0].name->path );
-	else
-		printf("%s-%d-g%s\n", all_matches[0].name->path,
-		       all_matches[0].depth,
+
+	display_name(all_matches[0].name);
+	if (abbrev)
+		printf("-%d-g%s", all_matches[0].depth,
 		       find_unique_abbrev(cmit->object.sha1, abbrev));
+	printf("\n");
 
 	if (!last_one)
 		clear_commit_marks(cmit, -1);