[PATCH] Don't sent objects for refs we're not going to update.

send_pack() sends only those refs we've asked to be updated on the
destination---either via an explicit refspec or by matching local and
remote refs.  But rev_list() builds an object list for *all* refs it
can find.  For a tree with many tags/heads, this means that it is
impossible to push updates even to a single refspec, as exec_rev_list()
overflows its arg length limit.

Fix this by skipping refs with no peer_ref set in exec_rev_list().
send_pack() already skips it when sending refs; we need to skip it
when building the object list for the pack too.

Signed-off-by: Stephen Tweedie <redacted>

---

 send-pack.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

4aa39c0920eea37987ca8a6b10861da7a87b5c14

diff --git a/send-pack.c b/send-pack.c
index 990be3f..d2a39d9 100644
--- a/send-pack.c
+++ b/send-pack.c

@@ -42,8 +42,10 @@ static void exec_rev_list(struct ref *re
 
 	args[i++] = "rev-list";	/* 0 */
 	args[i++] = "--objects";	/* 1 */
-	while (refs) {
+	for (; refs; refs = refs->next) {
 		char *buf = malloc(100);
+		if (!refs->peer_ref)
+			continue;
 		if (i > 900)
 			die("git-rev-list environment overflow");
 		if (!is_zero_sha1(refs->old_sha1) &&

@@ -56,7 +58,6 @@ static void exec_rev_list(struct ref *re
 			args[i++] = buf;
 			snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
 		}
-		refs = refs->next;
 	}
 	args[i] = NULL;
 	execv_git_cmd(args);

-- 
1.2.2.g6643-dirty