[PATCH v2] fast-import: tag may point to any object type

From: Dmitry Potapov <dpotapov@gmail.com>
Date: Jan 13, 2010, 12:35 UTC
Message-ID: <20100113123532.GC10586@dpotapov.dyndns.org>
In-Reply-To: <20100111171454.GO32155@spearce.org>

If you tried to export the official git repository, and then to import it back then git-fast-import would die complaining that "Mark :1 not a commit".

Accordingly to a generated crash file, Mark 1 is not a commit but a blob, which is pointed by junio-gpg-pub tag. Because git-tag allows to create such tags, git-fast-import should import them.

Signed-off-by: Dmitry Potapov <dpotapov@gmail.com>
---

On Mon, Jan 11, 2010 at 09:14:54AM -0800, Shawn O. Pearce wrote:

Show 7 quoted lines

> 
> Your patch is the right idea.  But you need to make sure all of
> the branch arms are handled correctly.
> 
> That is, if we do this, the get_sha1() on line 2459 should also
> permit non-commit objects, and the lookup_branch() earlier up on
> line 2451 should do "type = OBJ_COMMIT".

Thank you for guideliness. I do not understand this code well. I hope I got it right this time.

 fast-import.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/fast-import.c b/fast-import.c
index cd87049..4fdf809 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -2305,6 +2305,7 @@ static void parse_new_tag(void)
 	struct tag *t;
 	uintmax_t from_mark = 0;
 	unsigned char sha1[20];
+	enum object_type type;
 
 	/* Obtain the new tag name from the rest of our command */
 	sp = strchr(command_buf.buf, ' ') + 1;
@@ -2325,19 +2326,20 @@ static void parse_new_tag(void)
 	s = lookup_branch(from);
 	if (s) {
 		hashcpy(sha1, s->sha1);
+		type = OBJ_COMMIT;
 	} else if (*from == ':') {
 		struct object_entry *oe;
 		from_mark = strtoumax(from + 1, NULL, 10);
 		oe = find_mark(from_mark);
-		if (oe->type != OBJ_COMMIT)
-			die("Mark :%" PRIuMAX " not a commit", from_mark);
+		type = oe->type;
 		hashcpy(sha1, oe->sha1);
 	} else if (!get_sha1(from, sha1)) {
 		unsigned long size;
 		char *buf;
 
+		type = sha1_object_info(sha1, NULL);
 		buf = read_object_with_reference(sha1,
-			commit_type, &size, sha1);
+			typename(type), &size, sha1);
 		if (!buf || size < 46)
 			die("Not a valid commit: %s", from);
 		free(buf);
@@ -2362,7 +2364,7 @@ static void parse_new_tag(void)
 		    "object %s\n"
 		    "type %s\n"
 		    "tag %s\n",
-		    sha1_to_hex(sha1), commit_type, t->name);
+		    sha1_to_hex(sha1), typename(type), t->name);
 	if (tagger)
 		strbuf_addf(&new_data,
 			    "tagger %s\n", tagger);

-- 
1.6.6.137.g1acb