title: Installing PHP Pear packages via Ansible with idempotency
body: <p>I'm currently installing Pear packages for PHP with Ansible like so:</p>
  
  <pre><code>- name: Add Phergie PEAR channel.
    command: pear channel-discover pear.phergie.org
    ignore_errors: yes
  
  - name: Install Phergie and related plugins.
    command: pear install pear.phergie.org/{{ item }}
    with_items:
    - Phergie
    - Phergie_Plugin_AltNick
    ignore_errors: yes
  </code></pre>
  
  <p>The <code>ignore_errors</code> is required because pear always reports an error when running a command that's been run/completed successfully before (like:</p>
  
  <pre><code>TASK: [Add Phergie PEAR channel.] ********************************************* 
  failed: [10.31.9.210] =&gt; {"changed": true, "cmd": ["pear", "channel-discover", "pear.phergie.org"], "delta": "0:00:01.089340", "end": "2013-12-27 10:16:25.640083", "item": "", "rc": 1, "start": "2013-12-27 10:16:24.550743"}
  stdout: Channel "pear.phergie.org" is already initialized
  ...ignoring
  
  TASK: [Install Phergie and related plugins.] ********************************** 
  failed: [10.31.9.210] =&gt; (item=Phergie) =&gt; {"changed": true, "cmd": ["pear", "install", "pear.phergie.org/Phergie"], "delta": "0:00:03.698780", "end": "2013-12-27 10:16:30.337371", "item": "Phergie", "rc": 1, "start": "2013-12-27 10:16:26.638591"}
  stdout: phergie/Phergie is already installed and is the same as the released version 2.1.0
  install failed
  ...ignoring
  failed: [10.31.9.210] =&gt; (item=Phergie_Plugin_AltNick) =&gt; {"changed": true, "cmd": ["pear", "install", "pear.phergie.org/Phergie_Plugin_AltNick"], "delta": "0:00:01.779589", "end": "2013-12-27 10:16:33.231524", "item": "Phergie_Plugin_AltNick", "rc": 1, "start": "2013-12-27 10:16:31.451935"}
  stdout: phergie/Phergie_Plugin_AltNick is already installed and is the same as the released version 2.1.0
  install failed
  ...ignoring
  </code></pre>
  
  <p>Is there a better (more idempotent) way to run pear commands, and not have to scroll through a bunch of big, red ignored errors?</p>