195 lines
10 KiB
Markdown
195 lines
10 KiB
Markdown
---
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stage: Create
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group: Gitaly
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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
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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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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/196051) in GitLab 12.8 replacing Custom Hooks.
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Git supports hooks that are executed on different actions. These hooks run on the server and can be
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used to enforce specific commit policies or perform other tasks based on the state of the
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repository.
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Git supports the following hooks:
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- `pre-receive`
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- `post-receive`
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- `update`
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See [the Git documentation](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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Server-side Git hooks can be configured for:
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- [A single repository](#create-a-server-hook-for-a-repository).
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- [All repositories](#create-a-global-server-hook-for-all-repositories).
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Note the following about server hooks:
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- Server hooks must be configured on the file system of the GitLab server. Only GitLab server
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administrators are able to complete these tasks. If you don't have file system access, see
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possible alternatives such as:
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- [Webhooks](../user/project/integrations/webhooks.md).
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- [GitLab CI/CD](../ci/README.md).
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- [Push Rules](../push_rules/push_rules.md), for a user-configurable Git hook
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interface. **(STARTER)**
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- Server hooks aren't replicated to [Geo](geo/replication/index.md) secondary nodes.
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## Create a server hook for a repository
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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
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`/home/git/repositories/<group>/<project>.git`.
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- For Omnibus GitLab installs, the path is usually
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`/var/opt/gitlab/git-data/repositories/<group>/<project>.git`.
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Follow the steps below to set up a server-side hook for a repository:
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1. Navigate to **Admin area > Projects** and click on the project you want to add a server hook to.
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1. Locate the **Gitaly relative path** on the page that appears. This is where the server hook
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must be implemented. For information on interpreting the relative path, see
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[Translating hashed storage paths](repository_storage_types.md#translating-hashed-storage-paths).
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1. On the file system, 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 the hook type. For
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example, for a pre-receive hook the filename should be `pre-receive` with no extension.
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1. Make the hook file executable and ensure that it's owned by the Git user.
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1. Write the code to make the server hook function as expected. Hooks can be in any language. Ensure
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the ["shebang"](https://en.wikipedia.org/wiki/Shebang_(Unix)) at the top properly reflects the
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language type. For example, if the script is in Ruby the shebang is probably
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`#!/usr/bin/env ruby`.
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Assuming the hook code is properly implemented, the hook code is executed as appropriate.
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## Create a global server hook for all repositories
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To create a Git hook that applies to all of the repositories in your instance, set a global server
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hook. The default global server hook directory is in the GitLab Shell directory. Any
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hook added there applies to all repositories.
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The default directory:
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- For an installation from source is usually `/home/git/gitlab-shell/hooks`.
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- For Omnibus GitLab installs is usually `/opt/gitlab/embedded/service/gitlab-shell/hooks`.
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To use a different directory for global server hooks, set `custom_hooks_dir` in Gitaly
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configuration:
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- For Omnibus installations, this is set in `gitlab.rb`.
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- For source installations, the configuration location depends on the GitLab version. For:
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- GitLab 13.0 and earlier, this is set in `gitlab-shell/config.yml`.
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- GitLab 13.1 and later, this is set in `gitaly/config.toml` under the `[hooks]` section.
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NOTE: **Note:**
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The `custom_hooks_dir` value in `gitlab-shell/config.yml` is still honored in GitLab 13.1 and later
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if the value in `gitaly/config.toml` is blank or non-existent.
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Follow the steps below to set up a global server hook for all repositories:
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1. On the GitLab server, navigate to the configured global server hook directory.
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1. Create a new directory in this location. Depending on the type of hook, it can be either a
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`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 in any language. Ensure the
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["shebang"](https://en.wikipedia.org/wiki/Shebang_(Unix)) at the top properly reflects the
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language type. For example, if the script is in Ruby the shebang is probably
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`#!/usr/bin/env ruby`.
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1. Make the hook file executable and ensure that it's owned by the Git user.
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Now test the hook to check whether it is functioning properly.
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## Chained hooks
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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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Server hooks set [per project](#create-a-server-hook-for-a-repository) or
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[globally](#create-a-global-server-hook-for-all-repositories) can be executed in a chain.
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Server hooks are searched for and executed in the following order of priority:
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- Built-in GitLab server hooks. These are not user-customizable.
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- `<project>.git/custom_hooks/<hook_name>`: Per-project hooks. This was kept for backwards
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compatibility.
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- `<project>.git/custom_hooks/<hook_name>.d/*`: Location for per-project hooks.
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- `<custom_hooks_dir>/<hook_name>.d/*`: Location for all executable global hook files
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except editor backup files.
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Within a directory, server hooks:
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- Are executed in alphabetical order.
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- Stop executing when a hook exits with a non-zero value.
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Note:
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- `<hook_name>.d` must be either `pre-receive.d`, `post-receive.d`, or `update.d` to work properly.
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Any other names are ignored.
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- Files in `.d` directories must be executable and not match the backup file pattern (`*~`).
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- For `<project>.git` you need to [translate](repository_storage_types.md#translating-hashed-storage-paths)
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your project name into the hashed storage format that GitLab uses.
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## Environment Variables
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The following set of environment variables are available to server hooks.
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| Environment variable | Description |
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|:---------------------|:----------------------------------------------------------------------------|
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| `GL_ID` | GitLab identifier of user that initiated the push. For example, `user-2234` |
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| `GL_PROJECT_PATH` | (GitLab 13.2 and later) GitLab project path |
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| `GL_PROTOCOL` | (GitLab 13.2 and later) Protocol used with push |
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| `GL_REPOSITORY` | `project-<id>` where `id` is the ID of the project |
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| `GL_USERNAME` | GitLab username of the user that initiated the push |
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Pre-receive and post-receive server hooks can also access the following Git environment variables.
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| Environment variable | Description |
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|:-----------------------------------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `GIT_ALTERNATE_OBJECT_DIRECTORIES` | Alternate object directories in the quarantine environment. See [Git `receive-pack` documentation](https://git-scm.com/docs/git-receive-pack#_quarantine_environment). |
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| `GIT_OBJECT_DIRECTORY` | GitLab project path in the quarantine environment. See [Git `receive-pack` documentation](https://git-scm.com/docs/git-receive-pack#_quarantine_environment). |
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| `GIT_PUSH_OPTION_COUNT` | Number of push options. See [Git `pre-receive` documentation](https://git-scm.com/docs/githooks#pre-receive). |
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| `GIT_PUSH_OPTION_<i>` | Value of push options where `i` is from `0` to `GIT_PUSH_OPTION_COUNT - 1`. See [Git `pre-receive` documentation](https://git-scm.com/docs/githooks#pre-receive). |
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NOTE: **Note:**
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While other environment variables can be passed to server hooks, your application should not rely on
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them as they can change.
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## Transition to Go
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> Introduced in GitLab 13.2 using feature flags.
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The following server hooks have been re-implemented in Go:
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- `pre-receive`, with the Go implementation used by default. To use the Ruby implementation instead,
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[disable](../operations/feature_flags.md#enable-or-disable-feature-flag-strategies) the
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`:gitaly_go_preceive_hook` feature flag.
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- `update`, with the Go implementation used by default. To use the Ruby implementation instead,
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[disable](../operations/feature_flags.md#enable-or-disable-feature-flag-strategies) the
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`:gitaly_go_update_hook` feature flag.
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- `post-receive`, however the Ruby implementation is used by default. To use the Go implementation
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instead, [enable](../operations/feature_flags.md#enable-or-disable-feature-flag-strategies) the
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`:gitaly_go_postreceive_hook` feature flag.
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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 a commit is declined or an error occurs
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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 generates 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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