119 lines
4.7 KiB
Markdown
119 lines
4.7 KiB
Markdown
---
|
|
stage: Create
|
|
group: Source Code
|
|
info: "To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers"
|
|
type: reference
|
|
---
|
|
|
|
# File hooks
|
|
|
|
> - Introduced in GitLab 10.6.
|
|
> - Until GitLab 12.8, the feature name was Plugins.
|
|
|
|
With custom file hooks, GitLab administrators can introduce custom integrations
|
|
without modifying GitLab's source code.
|
|
|
|
NOTE: **Note:**
|
|
Instead of writing and supporting your own file hook you can make changes
|
|
directly to the GitLab source code and contribute back upstream. This way we can
|
|
ensure functionality is preserved across versions and covered by tests.
|
|
|
|
NOTE: **Note:**
|
|
File hooks must be configured on the filesystem of the GitLab server. Only GitLab
|
|
server administrators will be able to complete these tasks. Explore
|
|
[system hooks](../system_hooks/system_hooks.md) or [webhooks](../user/project/integrations/webhooks.md) as an option if you do not have filesystem access.
|
|
|
|
A file hook will run on each event so it's up to you to filter events or projects
|
|
within a file hook code. You can have as many file hooks as you want. Each file hook will
|
|
be triggered by GitLab asynchronously in case of an event. For a list of events
|
|
see the [system hooks](../system_hooks/system_hooks.md) documentation.
|
|
|
|
## Setup
|
|
|
|
The file hooks must be placed directly into the `file_hooks` directory, subdirectories
|
|
will be ignored. There is an
|
|
[`example` directory inside `file_hooks`](https://gitlab.com/gitlab-org/gitlab/tree/master/file_hooks/examples)
|
|
where you can find some basic examples.
|
|
|
|
Follow the steps below to set up a custom hook:
|
|
|
|
1. On the GitLab server, navigate to the plugin directory.
|
|
For an installation from source the path is usually
|
|
`/home/git/gitlab/file_hooks/`. For Omnibus installs the path is
|
|
usually `/opt/gitlab/embedded/service/gitlab-rails/file_hooks`.
|
|
|
|
For [configurations with multiple servers](reference_architectures/index.md),
|
|
your hook file should exist on each application server.
|
|
|
|
1. Inside the `file_hooks` directory, create a file with a name of your choice,
|
|
without spaces or special characters.
|
|
1. Make the hook file executable and make sure it's owned by the Git user.
|
|
1. Write the code to make the file hook function as expected. That can be
|
|
in any language, and ensure the 'shebang' at the top properly reflects the
|
|
language type. For example, if the script is in Ruby the shebang will
|
|
probably be `#!/usr/bin/env ruby`.
|
|
1. The data to the file hook will be provided as JSON on STDIN. It will be exactly
|
|
same as for [system hooks](../system_hooks/system_hooks.md).
|
|
|
|
That's it! Assuming the file hook code is properly implemented, the hook will fire
|
|
as appropriate. The file hooks file list is updated for each event, there is no
|
|
need to restart GitLab to apply a new file hook.
|
|
|
|
If a file hook executes with non-zero exit code or GitLab fails to execute it, a
|
|
message will be logged to:
|
|
|
|
- `gitlab-rails/plugin.log` in an Omnibus installation.
|
|
- `log/plugin.log` in a source installation.
|
|
|
|
## Creating file hooks
|
|
|
|
Below is an example that will only response on the event `project_create` and
|
|
will inform the admins from the GitLab instance that a new project has been created.
|
|
|
|
```ruby
|
|
#!/opt/gitlab/embedded/bin/ruby
|
|
# By using the embedded ruby version we eliminate the possibility that our chosen language
|
|
# would be unavailable from
|
|
require 'json'
|
|
require 'mail'
|
|
|
|
# The incoming variables are in JSON format so we need to parse it first.
|
|
ARGS = JSON.parse(STDIN.read)
|
|
|
|
# We only want to trigger this file hook on the event project_create
|
|
return unless ARGS['event_name'] == 'project_create'
|
|
|
|
# We will inform our admins of our gitlab instance that a new project is created
|
|
Mail.deliver do
|
|
from 'info@gitlab_instance.com'
|
|
to 'admin@gitlab_instance.com'
|
|
subject "new project " + ARGS['name']
|
|
body ARGS['owner_name'] + 'created project ' + ARGS['name']
|
|
end
|
|
```
|
|
|
|
## Validation
|
|
|
|
Writing your own file hook can be tricky and it's easier if you can check it
|
|
without altering the system. A Rake task is provided so that you can use it
|
|
in a staging environment to test your file hook before using it in production.
|
|
The Rake task will use a sample data and execute each of file hook. The output
|
|
should be enough to determine if the system sees your file hook and if it was
|
|
executed without errors.
|
|
|
|
```shell
|
|
# Omnibus installations
|
|
sudo gitlab-rake file_hooks:validate
|
|
|
|
# Installations from source
|
|
cd /home/git/gitlab
|
|
bundle exec rake file_hooks:validate RAILS_ENV=production
|
|
```
|
|
|
|
Example of output:
|
|
|
|
```plaintext
|
|
Validating file hooks from /file_hooks directory
|
|
* /home/git/gitlab/file_hooks/save_to_file.clj succeed (zero exit code)
|
|
* /home/git/gitlab/file_hooks/save_to_file.rb failure (non-zero exit code)
|
|
```
|