130 lines
6.3 KiB
Markdown
130 lines
6.3 KiB
Markdown
---
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type: reference, howto
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disqus_identifier: 'https://docs.gitlab.com/ee/administration/custom_hooks.html'
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---
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# Server hooks **(CORE ONLY)**
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> **Notes:**
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>
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> - Server hooks were [introduced](https://gitlab.com/gitlab-org/gitlab/issues/196051) in GitLab 12.8 replacing Custom Hooks.
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> - Server hooks must be configured on the filesystem of the GitLab server. Only GitLab server administrators will be able to complete these tasks. Please explore [webhooks](../user/project/integrations/webhooks.md) and [GitLab CI/CD](../ci/README.md) as an option if you do not have filesystem access. For a user-configurable Git hook interface, see [Push Rules](../push_rules/push_rules.md), available in GitLab Starter **(STARTER)**.
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> - Server hooks won't be replicated to secondary nodes if you use [GitLab Geo](geo/replication/index.md).
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Git natively supports hooks that are executed on different actions. These hooks run
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on the server and can be used to enforce specific commit policies or perform other
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tasks based on the state of the repository.
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Examples of server-side Git hooks include `pre-receive`, `post-receive`, and `update`.
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See [Git SCM Server-Side Hooks](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks#Server-Side-Hooks)
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for more information about each hook type.
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## Create a server hook for a repository
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Server-side Git hooks are typically placed in the repository's `hooks`
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subdirectory. In GitLab, hook directories are symlinked to the GitLab Shell
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`hooks` directory for ease of maintenance between GitLab Shell upgrades.
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Server hooks are implemented differently, but the behavior is exactly the same
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once the hook is created.
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NOTE: **Note:**
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If you are not using [hashed storage](repository_storage_types.md#hashed-storage), the project's
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repository directory might not exactly match the instructions below. In that case,
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for an installation from source the path is usually `/home/git/repositories/<group>/<project>.git`.
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For Omnibus installs the path is usually `/var/opt/gitlab/git-data/repositories/<group>/<project>.git`.
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Follow the steps below to set up a server hook for a
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repository:
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1. Find that project's path on the GitLab server, by navigating to the
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**Admin area > Projects**. From there, select the project for which you
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would like to add a hook. You can find the path to the project's repository
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under **Gitaly relative path** on that page.
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1. Create a new directory in this location called `custom_hooks`.
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1. Inside the new `custom_hooks` directory, create a file with a name matching
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the hook type. For a pre-receive hook the file name should be `pre-receive`
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with no extension.
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1. Make the hook file executable and make sure it's owned by Git.
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1. Write the code to make the server hook function as expected. Hooks can be
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in any language. Ensure the 'shebang' at the top properly reflects the language
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type. For example, if the script is in Ruby the shebang will probably be
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`#!/usr/bin/env ruby`.
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Assuming the hook code is properly implemented the hook will run as appropriate.
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## Set a global server hook for all repositories
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To create a Git hook that applies to all of your repositories in
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your instance, set a global server hook. Since GitLab will look inside the GitLab Shell
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`hooks` directory for global hooks, adding any hook there will apply it to all repositories.
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Follow the steps below to properly set up a server hook for all repositories:
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1. On the GitLab server, navigate to the configured custom hook directory. The
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default is in the GitLab Shell directory. The GitLab Shell `hook` directory
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for an installation from source the path is usually
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`/home/git/gitlab-shell/hooks`. For Omnibus installs the path is usually
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`/opt/gitlab/embedded/service/gitlab-shell/hooks`.
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To look in a different directory for the global custom hooks,
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set `custom_hooks_dir` in the GitLab Shell config. For
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Omnibus installations, this can be set in `gitlab.rb`; and in source
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installations, this can be set in `gitlab-shell/config.yml`.
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1. Create a new directory in this location. Depending on your hook, it will be
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either a `pre-receive.d`, `post-receive.d`, or `update.d` directory.
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1. Inside this new directory, add your hook. Hooks can be
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in any language. Ensure the 'shebang' at the top properly reflects the language
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type. For example, if the script is in Ruby the shebang will probably be
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`#!/usr/bin/env ruby`.
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1. Make the hook file executable and make sure it's owned by Git.
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Now test the hook to check whether it is functioning properly.
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## Chained hooks support
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> [Introduced](https://gitlab.com/gitlab-org/gitlab-shell/-/merge_requests/93) in GitLab Shell 4.1.0 and GitLab 8.15.
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Hooks can be also global or be set per project directories and support a chained
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execution of the hooks.
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NOTE: **Note:**
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`<hook_name>.d` would need to be either `pre-receive.d`,
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`post-receive.d`, or `update.d` to work properly. Any other names will be ignored.
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NOTE: **Note:**
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Files in `.d` directories need to be executable and not match the backup file
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pattern (`*~`).
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The hooks are searched and executed in this order:
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1. Built-in GitLab server hooks (not user-customizable).
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1. `<project>.git/custom_hooks/<hook_name>` - per-project hook (this was kept as the already existing behavior).
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1. `<project>.git/custom_hooks/<hook_name>.d/*` - per-project hooks.
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1. `<custom_hooks_dir>/<hook_name>.d/*` - global hooks: all executable files (except editor backup files).
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The hooks of the same type are executed in order and execution stops on the
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first script exiting with a non-zero value.
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For `<project>.git` you'll need to
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[translate your project name into the hashed storage format](repository_storage_types.md#translating-hashed-storage-paths)
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that GitLab uses.
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## Custom error messages
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> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5073) in GitLab 8.10.
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To have custom error messages appear in GitLab's UI when the commit is
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declined or an error occurs during the Git hook, your script should:
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- Send the custom error messages to either the script's `stdout` or `stderr`.
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- Prefix each message with `GL-HOOK-ERR:` with no characters appearing before the prefix.
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### Example custom error message
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This hook script written in bash will generate the following message in GitLab's UI:
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```shell
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#!/bin/sh
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echo "GL-HOOK-ERR: My custom error message.";
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exit 1
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```
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