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diff --git a/doc/development/gitaly.md b/doc/development/gitaly.md new file mode 100644 index 00000000000..f0be3a6b141 --- /dev/null +++ b/doc/development/gitaly.md @@ -0,0 +1,54 @@ +# GitLab Developers Guide to Working with Gitaly + +[Gitaly](https://gitlab.com/gitlab-org/gitaly) is a high-level Git RPC service used by GitLab CE/EE, +Workhorse and GitLab-Shell. All Rugged operations in GitLab CE/EE are currently being phased out to +be replaced by Gitaly API calls. + +Visit the [Gitaly Migration Board](https://gitlab.com/gitlab-org/gitaly/boards/331341) for current +status of the migration. + +## Feature Flags + +Gitaly makes heavy use of [feature flags](feature_flags.md). + +Each Rugged-to-Gitaly migration goes through a [series of phases](https://gitlab.com/gitlab-org/gitaly/blob/master/doc/MIGRATION_PROCESS.md): +* **Opt-In**: by default the Rugged implementation is used. + * Production instances can choose to enable the Gitaly endpoint by enabling the feature flag. + * For testing purposes, you may wish to enable all feature flags by default. This can be done by exporting the following + environment variable: `GITALY_FEATURE_DEFAULT_ON=1`. + * On developer instances (ie, when `Rails.env.development?` is true), the Gitaly endpoint + is enabled by default, but can be _disabled_ using feature flags. +* **Opt-Out**: by default, the Gitaly endpoint is used, but the feature can be explicitly disabled using the feature flag. +* **Madatory**: The migration is complete and cannot be disabled. The old codepath is removed. + +### Enabling and Disabling Feature + +In the Rails console, type: + +```ruby +Feature.enable(:gitaly_feature_name) +Feature.disable(:gitaly_feature_name) +``` + +Where `gitaly_feature_name` is the name of the Gitaly feature. This can be determined by finding the appropriate +`gitaly_migrate` code block, for example: + +```ruby +gitaly_migrate(:tag_names) do +... +end +``` + +Since Gitaly features are always prefixed with `gitaly_`, the name of the feature flag in this case would be `gitaly_tag_names`. + +## Gitaly-Related Test Failures + +If your test-suite is failing with Gitaly issues, as a first step, try running: + +```shell +rm -rf tmp/tests/gitaly +``` + +--- + +[Return to Development documentation](README.md) |