[PATCH 1/2] ls-remote: do not send ref prefixes for patterns

[Jeff King <peff@peff.net>]

Since b4be74105f (ls-remote: pass ref prefixes when requesting a
remote's refs, 2018-03-15), "ls-remote foo" will pass "refs/heads/foo",
"refs/tags/foo", etc to the transport code in an attempt to let the
other side reduce the size of its advertisement.

Unfortunately this is not correct, as ls-remote patterns do not follow
the usual ref lookup rules, and are in fact tail-matched. So we could
find "refs/heads/foo" or "refs/heads/a/much/deeper/foo" or even
"refs/another/hierarchy/foo".

Since we can't pass a prefix and there's not yet a v2 extension for
matching wildcards, we must disable this feature to keep the same
behavior as v1.

Reported-by: Jon Simons <jon@jonsimons.org>
Signed-off-by: Jeff King <peff@peff.net>
---
 builtin/ls-remote.c  | 8 --------
 t/t5512-ls-remote.sh | 9 +++++++++
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/builtin/ls-remote.c b/builtin/ls-remote.c
index 6a0cdec30d..5faa8459d9 100644
--- a/builtin/ls-remote.c
+++ b/builtin/ls-remote.c
@@ -88,15 +88,7 @@ int cmd_ls_remote(int argc, const char **argv, const char *prefix)
 		int i;
 		pattern = xcalloc(argc, sizeof(const char *));
 		for (i = 1; i < argc; i++) {
-			const char *glob;
 			pattern[i - 1] = xstrfmt("*/%s", argv[i]);
-
-			glob = strchr(argv[i], '*');
-			if (glob)
-				argv_array_pushf(&ref_prefixes, "%.*s",
-						 (int)(glob - argv[i]), argv[i]);
-			else
-				expand_ref_prefix(&ref_prefixes, argv[i]);
 		}
 	}
 
diff --git a/t/t5512-ls-remote.sh b/t/t5512-ls-remote.sh
index bc5703ff9b..ca1b7e5bc1 100755
--- a/t/t5512-ls-remote.sh
+++ b/t/t5512-ls-remote.sh
@@ -302,4 +302,13 @@ test_expect_success 'ls-remote works outside repository' '
 	nongit git ls-remote dst.git
 '
 
+test_expect_success 'ls-remote patterns work with all protocol versions' '
+	git for-each-ref --format="%(objectname)	%(refname)" \
+		refs/heads/master refs/remotes/origin/master >expect &&
+	git -c protocol.version=1 ls-remote . master >actual.v1 &&
+	test_cmp expect actual.v1 &&
+	git -c protocol.version=2 ls-remote . master >actual.v2 &&
+	test_cmp expect actual.v2
+'
+
 test_done
-- 
2.19.1.1298.g19f18f2a22