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One way to customize Bazaar's behaviour is with *hooks*. Hooks allow you to
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perform actions before or after certain Bazaar operations. The operations
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include ``commit``, ``push``, ``pull``, and ``uncommit``.
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For a complete list of hooks and their parameters, see `Hooks
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<../user-reference/hooks-help.html>`_ in the User Reference.
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Most hooks are run on the client, but a few are run on the server. (Also
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see the `push-and-update plugin`_ that handles one special case of
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server-side operations.)
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.. _push-and-update plugin: http://doc.bazaar.canonical.com/plugins/en/push-and-update-plugin.html
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To use a hook, you should `write a plugin <#writing-a-plugin>`_. Instead of
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To use a hook, you should `write a plugin`_. Instead of
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creating a new command, this plugin will define and install the hook. Here's
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branch.Branch.hooks.install_named_hook('post_push', post_push_hook,
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'My post_push hook')
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.. _write a plugin: http://doc.bazaar.canonical.com/plugins/en/plugin-development.html
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To use this example, create a file named ``push_hook.py``, and stick it in
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``plugins`` subdirectory of your configuration directory. (If you have never
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installed any plugins, you may need to create the ``plugins`` directory).
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First, we define a function that will be run after ``push`` completes. We
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could also use an instance method or a callable object. All push hooks take a
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single argument, the ``push_result``.
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Next, we install the hook. ``'post_push'`` identifies where we want to install
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the hook, and the second parameter is the hook itself. We also give the hook a
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name 'My post_push hook', which can be used in progress messages and error
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That's it! The next time you push, it should show "The new revno is...".
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Of course, hooks can be much more elaborate than this, because you have the
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full power of Python at your disposal. Now that you know how to use hooks,
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what you do with them is up to you.
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The plugin code does two things. First, it defines a function that will be
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run after ``push`` completes. (It could instead use an instance method or
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a callable object.) All push hooks take a single argument, the
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For a complete list of hooks and their parameters, see `Hooks
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<../user-reference/bzr_man.html#hooks>`_ in the User Reference.
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Second, the plugin installs the hook. The first argument ``'post_push'``
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identifies where to install the hook. The second argument is the hook
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itself. The third argument is a name ``'My post_push hook'``, which can be
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used in progress messages and error messages.