Ansible ad-hoc command filter JSON output by key or property

Question

I\'d like to filter the JSON output of ad-hoc ansible commands - e.g. grab the long list of \"facts\" for multiple hosts, and show only one that could be several levels dee

Answer 1

Standard setup module can apply filter only on "top-level" facts.

To achieve what you want, you can make an action plugin with setup name to apply custom filters.

Working example ./action_plugins/setup.py:

from ansible.plugins.action import ActionBase

class ActionModule(ActionBase):

    def run(self, tmp=None, task_vars=None):

        def lookup(obj, path):
            return reduce(dict.get, path.split('.'), obj)

        result = super(ActionModule, self).run(tmp, task_vars)

        myfilter = self._task.args.get('myfilter', None)

        module_args = self._task.args.copy()
        if myfilter:
            module_args.pop('myfilter')

        module_return = self._execute_module(module_name='setup', module_args=module_args, task_vars=task_vars, tmp=tmp)

        if not module_return.get('failed') and myfilter:
            return {"changed":False, myfilter:lookup(module_return['ansible_facts'], myfilter)}
        else:
            return module_return

It calls original setup module stripping myfilter parameter, then filters result with simple reduce implementation if task is not failed and myfilter is set. Lookup function is very simple, so it will not work with lists, only with objects.

Result:

$ ansible myserver -m setup -a "myfilter=ansible_lsb.description"
myserver | SUCCESS => {
    "ansible_lsb.description": "Ubuntu 12.04.4 LTS",
    "changed": false
}