When a project is given to a hook, the environment will have GIT_DIR set to the full path of the affected git repository so that git commands can be easily run.
Make sure your hook scripts are executable if running on *nix.
With the exception of the commit-received and ref-update hooks, hooks are run in the background after the relevant change has taken place so are unable to affect the outcome of any given change. Because of the fact the hooks are run in the background after the activity, a hook might not be notified about an event if the server is shutdown before the hook can be invoked.
The plugin is configured in a [hooks] section in the gerrit.config file in the site's etc folder.
The configuration values are evaluated when the plugin is loaded. If the values are changed, the plugin must be reloaded for them to take effect.
A hook may be temporarily disabled by either removing it or renaming it. Its behavior may be changed by replacing its content. Such changes will take immediate effect without having to reload the plugin.
hooks.path : Location of hook executables. If not set, defaults to $site_path/hooks
hooks.syncHookTimeout : Timeout value in seconds for synchronous hooks. If not set, defaults to 30 seconds.
hooks.changeAbandonedHook : Filename for the change abandoned hook. If not set, defaults to change-abandoned.
hooks.changeMergedHook : Filename for the change merged hook. If not set, defaults to change-merged.
hooks.changeRestoredHook : Filename for the change restored hook. If not set, defaults to change-restored.
hooks.claSignedHook : Filename for the CLA signed hook. If not set, defaults to cla-signed.
hooks.commentAddedHook : Filename for the comment added hook. If not set, defaults to comment-added.
hooks.commitReceivedHook : Filename for the commit received hook. If not set, defaults to commit-received.
hooks.draftPublishedHook : Filename for the draft published hook. If not set, defaults to draft-published.
hooks.hashtagsChangedHook : Filename for the hashtags changed hook. If not set, defaults to hashtags-changed.
hooks.patchsetCreatedHook : Filename for the patchset created hook. If not set, defaults to patchset-created.
hooks.projectCreatedHook : Filename for the project created hook. If not set, defaults to project-created.
hooks.refUpdateHook : Filename for the ref update hook. If not set, defaults to ref-update.
hooks.refUpdatedHook : Filename for the ref updated hook. If not set, defaults to ref-updated.
hooks.reviewerAddedHook : Filename for the reviewer added hook. If not set, defaults to reviewer-added.
hooks.reviewerDeletedHook : Filename for the reviewer update hook. If not set, defaults to reviewer-deleted.
hooks.topicChangedHook : Filename for the topic changed hook. If not set, defaults to topic-changed.
If gerrit.canonicalWebUrl is not set in gerrit.config the --change-url flag may not be passed to all hooks. Hooks started out of an SSH context (for example the patchset-created hook) don‘t know the server’s web URL, unless this variable is configured.
After execution of a hook, its exit code and any output are logged at debug level. To make this visible in Gerrit's log file, debug logging must be enabled for com.googlesource.gerrit.plugins.hooks.HookTask.
This can be done by editing the log4j.properties file (requires a Gerrit restart) or by setting the log level at runtime with the ssh command:
ssh -p 29418 user@gerrit gerrit logging set-level DEBUG com.googlesource.gerrit.plugins.hooks.HookTask