Test if remote repository exists before cloning

When a repository does not exist on a remote, Gitaly won't be able to
clone it. This is correct behaviour, but from the clients perspective a
change in behaviour.

This change implements the client side changes that allows Gitaly to
execute a `git ls-remote <remote-url> HEAD`. This way the client has no
need to shell out to Git.

In the situation where multiple Gitalies are available, one is chosen at
random.

This commit closes https://gitlab.com/gitlab-org/gitlab-ce/issues/43929,
while its also a part of https://gitlab.com/gitlab-org/gitaly/issues/1084

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/lib/gitlab/gitaly_client/remote_service_spec.rb b/spec/lib/gitlab/gitaly_client/remote_service_spec.rb
index 872377c93d8..f03c7e3f04b 100644
--- a/spec/lib/gitlab/gitaly_client/remote_service_spec.rb
+++ b/spec/lib/gitlab/gitaly_client/remote_service_spec.rb
@@ -58,4 +58,14 @@ describe Gitlab::GitalyClient::RemoteService do
       client.update_remote_mirror(ref_name, only_branches_matching)
     end
   end
+
+  describe '.exists?' do
+    context "when the remote doesn't exist" do
+      let(:url) { 'https://gitlab.com/gitlab-org/ik-besta-niet-of-ik-word-geplaagd.git' }
+
+      it 'returns false' do
+        expect(described_class.exists?(url)).to be(false)
+      end
+    end
+  end
 end