[PATCH 2/4] fast-export: improve speed by skipping blobs

[Felipe Contreras <felipe.contreras@gmail.com>]

We don't care about blobs, or any object other than commits, but in
order to find the type of object, we are parsing the whole thing, which
is slow, specially in big repositories with lots of big files.

There's no need for that, we can query the object information with
sha1_object_info();

Before this, loading the objects of a fresh emacs import, with 260598
blobs took 14 minutes, after this patch, it takes 3 seconds.

This is the way fast-import does it. Also die if the object is not
found (like fast-import).

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 builtin/fast-export.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index a4dee14..a5b8da8 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -613,6 +613,7 @@ static void import_marks(char *input_file)
 		char *line_end, *mark_end;
 		unsigned char sha1[20];
 		struct object *object;
+		enum object_type type;
 
 		line_end = strchr(line, '\n');
 		if (line[0] != ':' || !line_end)
@@ -627,17 +628,19 @@ static void import_marks(char *input_file)
 		if (last_idnum < mark)
 			last_idnum = mark;
 
-		object = parse_object(sha1);
-		if (!object)
+		type = sha1_object_info(sha1, NULL);
+		if (type < 0)
+			die("object not found: %s", sha1_to_hex(sha1));
+
+		if (type != OBJ_COMMIT)
+			/* only commits */
 			continue;
 
+		object = parse_object(sha1);
+
 		if (object->flags & SHOWN)
 			error("Object %s already has a mark", sha1_to_hex(sha1));
 
-		if (object->type != OBJ_COMMIT)
-			/* only commits */
-			continue;
-
 		mark_object(object, mark);
 
 		object->flags |= SHOWN;
-- 
1.8.3.rc0.401.g45bba44