[PATCH] notes: Use get_sha1_committish instead of read_ref in init_notes()

[Mike Hommey <mh@glandium.org>]

init_notes() is essentially the only point of entry to the notes API.
It is an arbitrary restriction that all it allows as input is a strict
ref name, when callers may want to give an arbitrary committish.

This has the side effect of enabling the use of committish as notes refs
in commands allowing them, e.g. git log --notes=foo@{1}, although
I haven't checked whether that's the case for all of them.

Signed-off-by: Mike Hommey <mh@glandium.org>
---

My motivation for this change is to allow to use init_notes from a
third-party helper that links to libgit.a with a commit that is not
pointed at directly by a ref. The side effect of making git log
--notes=foo@{1} work is nice IMHO. As noted, though, I haven't checked if
all code paths using init_notes don't prefilter the ref, but I assume
they don't. 

 notes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/notes.c b/notes.c
index df08209..402e4ce 100644
--- a/notes.c
+++ b/notes.c
@@ -1012,7 +1012,7 @@ void init_notes(struct notes_tree *t, const char *notes_ref,
 	t->dirty = 0;
 
 	if (flags & NOTES_INIT_EMPTY || !notes_ref ||
-	    read_ref(notes_ref, object_sha1))
+	    get_sha1_committish(notes_ref, object_sha1))
 		return;
 	if (get_tree_entry(object_sha1, "", sha1, &mode))
 		die("Failed to read notes tree referenced by %s (%s)",
-- 
2.4.3.2.gf0a024e.dirty