Invokes HTTP challenge start hooks.

Given a set of hook directories, returns whether a hook with the given name exists in any of them.

Notifies hook programs that a live symlink has been updated.

Installs a hook in the hooks directory.

Do not use.

The default hook paths default to the recommended hook paths but could be changed at runtime.

Log site.

The recommended hook paths are the paths at which executable hooks are looked for.

Provides contextual configuration information when executing a hook.