Add lookup module to lookup a "pass" password store

See http://www.passwordstore.org/ for details

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>

pass.py

@@ -0,0 +1,76 @@
+# (c) 2012, Daniel Hokka Zakrisson <daniel@hozac.com>
+# (c) 2015, Jan Losinski <losinski@wh2.tu-dresden.de>
+#
+# The original file was part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import subprocess
+
+from ansible import utils, errors
+from ansible.errors import AnsibleError
+
+class LookupModule(object):
+
+    COMMAND="pass"
+    CREDENIAL_DIR="credentials"
+
+    def __init__(self, basedir=None, **kwargs):
+        self.basedir = basedir
+
+    def run(self, terms, inject=None, **kwargs):
+
+        terms = utils.listify_lookup_plugin_terms(terms, self.basedir, inject) 
+
+        if isinstance(terms, basestring):
+            terms = [ terms ] 
+
+        ret = []
+        for term in terms:
+            '''
+            http://docs.python.org/2/library/subprocess.html#popen-constructor
+
+            The shell argument (which defaults to False) specifies whether to use the 
+            shell as the program to execute. If shell is True, it is recommended to pass 
+            args as a string rather than as a sequence
+
+            https://github.com/ansible/ansible/issues/6550
+            '''
+            term = str(term)
+
+            keydir = os.path.join(self.basedir, self.CREDENIAL_DIR)
+
+            env = dict(os.environ)
+            env["PASSWORD_STORE_DIR"] = keydir
+
+            command = "%s %s" % (self.COMMAND, term)
+
+            p = subprocess.Popen(command,
+                    cwd=self.basedir,
+                    shell=True,
+                    stdin=subprocess.PIPE,
+                    stdout=subprocess.PIPE,
+                    stderr=subprocess.PIPE,
+                    env=env)
+
+            (stdout, stderr) = p.communicate()
+            if p.returncode == 0:
+                ret.append(stdout.decode("utf-8").rstrip())
+            else:
+                err = stderr.decode("utf-8").rstrip()
+                raise AnsibleError("lookup_plugin.pass(%s) returned %d: %s" % (term, p.returncode, err))
+        return ret