remote: add api to guess the remote's default branch

If the remote supports the symref protocol extension, then we return
that, otherwise we guess with git's rules.

1 files changed, 50 insertions, 0 deletions

diff --git a/tests/network/remote/defaultbranch.c b/tests/network/remote/defaultbranch.c
new file mode 100644
index 000000000..fa3a329db
--- /dev/null
+++ b/tests/network/remote/defaultbranch.c
@@ -0,0 +1,50 @@
+#include "clar_libgit2.h"
+#include "buffer.h"
+#include "refspec.h"
+#include "remote.h"
+
+static git_remote *g_remote;
+static git_repository *g_repo_a, *g_repo_b;
+
+void test_network_remote_defaultbranch__initialize(void)
+{
+	g_repo_a = cl_git_sandbox_init("testrepo.git");
+	cl_git_pass(git_repository_init(&g_repo_b, "repo-b.git", true));
+	cl_git_pass(git_remote_create(&g_remote, g_repo_b, "origin", git_repository_path(g_repo_a)));
+}
+
+void test_network_remote_defaultbranch__cleanup(void)
+{
+	git_remote_free(g_remote);
+	git_repository_free(g_repo_b);
+
+	cl_git_sandbox_cleanup();
+	cl_fixture_cleanup("repo-b.git");
+}
+
+static void assert_default_branch(const char *should)
+{
+	git_buf name = GIT_BUF_INIT;
+
+	cl_git_pass(git_remote_connect(g_remote, GIT_DIRECTION_FETCH));
+	cl_git_pass(git_remote_default_branch(&name, g_remote));
+	cl_assert_equal_s(should, name.ptr);
+	git_buf_free(&name);
+}
+
+void test_network_remote_defaultbranch__master(void)
+{
+	assert_default_branch("refs/heads/master");
+}
+
+void test_network_remote_defaultbranch__master_does_not_win(void)
+{
+	cl_git_pass(git_repository_set_head(g_repo_a, "refs/heads/not-good", NULL, NULL));
+	assert_default_branch("refs/heads/not-good");
+}
+
+void test_network_remote_defaultbranch__master_on_detached(void)
+{
+	cl_git_pass(git_repository_detach_head(g_repo_a, NULL, NULL));
+	assert_default_branch("refs/heads/master");
+}