Use the API to fetch the remote default branch

2 files changed, 7 insertions, 2 deletions

diff --git a/README.md b/README.md
index 706e558f..27756bfa 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ To preview any changes you make to GitLab documentation, you need:
   - [`.tool-versions`](.tool-versions)
 - Node.js, at the version specified in [`.tool-versions`](.tool-versions).
 - Yarn, at the version specified in [`.tool-versions`](.tool-versions).
+- [jq](https://stedolan.github.io/jq/), needed by some Rake tasks.
 - Xcode *(macOS only)*:
   - Run `xcode-select --install` to install the command line tools only.
   - Or download and install the entire package using the macOS's App Store.
diff --git a/lib/task_helpers.rb b/lib/task_helpers.rb
index 5614ef37..358169b4 100644
--- a/lib/task_helpers.rb
+++ b/lib/task_helpers.rb
@@ -64,6 +64,10 @@ def chart_version(gitlab_version)
   config.fetch(gitlab_version)
 end
 
-def default_branch(remote_url)
-  `git remote show #{remote_url} | grep 'HEAD branch' | cut -d' ' -f5`.tr("\n", '')
+def default_branch(repo)
+  # Get the URL-encoded path of the project
+  # https://docs.gitlab.com/ee/api/README.html#namespaced-path-encoding
+  url_encoded_path = repo.sub('https://gitlab.com/', '').sub('.git', '').gsub('/', '%2F')
+
+  `curl https://gitlab.com/api/v4/projects/#{url_encoded_path} | jq --raw-output .default_branch`.tr("\n", '')
 end