Add shelvefile lookup plugin

lib/ansible/plugins/lookup/shelvefile.py

+# (c) 2015, Alejandro Guirao <lekumberri@gmail.com>
+#
+# This file is 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/>.
+
+import shelve
+import os
+from ansible import utils, errors
+
+class LookupModule(object):
+
+    def __init__(self, basedir=None, **kwargs):
+        self.basedir = basedir
+
+    def read_shelve(self, shelve_filename, key):
+        """
+        Read the value of "key" from a shelve file
+        """
+        d = shelve.open(shelve_filename)
+        res = d.get(key, None)
+        d.close()
+        return res
+
+    def run(self, terms, inject=None, **kwargs):
+
+        terms = utils.listify_lookup_plugin_terms(terms, self.basedir, inject)
+        ret = []
+
+        if not isinstance(terms, list):
+            terms = [ terms ]
+
+        for term in terms:
+            playbook_path = None
+            relative_path = None
+            paramvals = {"file": None, "key": None}
+            params = term.split()
+
+            try:
+                for param in params:
+                    name, value = param.split('=')
+                    assert(name in paramvals)
+                    paramvals[name] = value
+
+            except (ValueError, AssertionError), e:
+                # In case "file" or "key" are not present
+                raise errors.AnsibleError(e)
+
+            file = paramvals['file']
+            key = paramvals['key']
+            basedir_path  = utils.path_dwim(self.basedir, file)
+
+            # Search also in the role/files directory and in the playbook directory
+            if '_original_file' in inject:
+                relative_path = utils.path_dwim_relative(inject['_original_file'], 'files', file, self.basedir, check=False)
+            if 'playbook_dir' in inject:
+                playbook_path = os.path.join(inject['playbook_dir'], file)
+
+            for path in (basedir_path, relative_path, playbook_path):
+                if path and os.path.exists(path):
+                    res = self.read_shelve(path, key)
+                    if res is None:
+                        raise errors.AnsibleError("Key %s not found in shelve file %s" % (key, file))
+                    # Convert the value read to string
+                    ret.append(str(res))
+                    break
+            else:
+                raise errors.AnsibleError("Could not locate shelve file in lookup: %s" % file)
+
+        return ret