add rpm_q module to query rpm database

library/rpm_q.py

@@ -0,0 +1,66 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2015, Tobias Florek <tob@butter.sh>
+# Licensed under the terms of the MIT License
+
+from ansible.module_utils.basic import *
+
+DOCUMENTATION = """
+---
+module: rpm_q
+short_description: Query the RPM database
+author: Tobias Florek
+options:
+  name:
+    description:
+    - The name of the package to query
+    required: true
+  state:
+    description:
+    - Whether the package is supposed to be installed or not
+    choices: [present, absent]
+    default: present
+"""
+
+EXAMPLES = """
+- rpm_q: name=ansible state=present
+- rpm_q: name=ansible state=absent
+"""
+
+import os
+
+RPM_BINARY = '/bin/rpm'
+
+def main():
+    """
+    Checks rpm -q for the named package and returns the installed packages
+    or None if not installed.
+    """
+    module = AnsibleModule(
+        argument_spec=dict(
+            name=dict(required=True),
+            state=dict(default='present', choices=['present', 'absent'])
+            ),
+        supports_check_mode=True
+    )
+
+    name = module.params['name']
+    state = module.params['state']
+
+    rc, out, err = module.run_command([RPM_BINARY, '-q', name])
+
+    installed = out.rstrip('\n').split('\n')
+
+    if rc != 0:
+        if state == 'present':
+            module.fail_json(msg="%s is not installed" % name, stdout=out, stderr=err, rc=rc)
+        else:
+            module.exit_json(changed=False)
+    elif state == 'present':
+        module.exit_json(changed=False, installed_versions=installed)
+    else:
+        module.fail_json(msg="%s is installed", installed_versions=installed)
+
+if __name__ == '__main__':
+    main()