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, 6 insertions, 2 deletions

diff --git a/lib/gitlab/github_import/importer/repository_importer.rb b/lib/gitlab/github_import/importer/repository_importer.rb
index ab0b751fe24..b1b283e98b5 100644
--- a/lib/gitlab/github_import/importer/repository_importer.rb
+++ b/lib/gitlab/github_import/importer/repository_importer.rb
@@ -16,7 +16,8 @@ module Gitlab
         # Returns true if we should import the wiki for the project.
         def import_wiki?
           client.repository(project.import_source)&.has_wiki &&
-            !project.wiki_repository_exists?
+            !project.wiki_repository_exists? &&
+            Gitlab::GitalyClient::RemoteService.exists?(wiki_url)
         end
 
         # Imports the repository data.
@@ -55,7 +56,6 @@ module Gitlab
 
         def import_wiki_repository
           wiki_path = "#{project.disk_path}.wiki"
-          wiki_url = project.import_url.sub(/\.git\z/, '.wiki.git')
           storage_path = project.repository_storage_path
 
           gitlab_shell.import_repository(storage_path, wiki_path, wiki_url)
@@ -70,6 +70,10 @@ module Gitlab
           end
         end
 
+        def wiki_url
+          project.import_url.sub(/\.git\z/, '.wiki.git')
+        end
+
         def update_clone_time
           project.update_column(:last_repository_updated_at, Time.zone.now)
         end