Fix permissions for jsonfile cache plugin

By default jsonfile uses mkstemp to create temporary file and it gets
0700 permissions. Explicitly run chmod to fix permissions.

plugins/cache/jsonfile_fix.py

@@ -0,0 +1,61 @@
+__metaclass__ = type
+
+DOCUMENTATION = '''
+    options:
+      _uri:
+        required: True
+        description:
+          - Path in which the cache plugin will save the JSON files
+        env:
+          - name: ANSIBLE_CACHE_PLUGIN_CONNECTION
+        ini:
+          - key: fact_caching_connection
+            section: defaults
+        type: path
+      _prefix:
+        description: User defined prefix to use when creating the JSON files
+        env:
+          - name: ANSIBLE_CACHE_PLUGIN_PREFIX
+        ini:
+          - key: fact_caching_prefix
+            section: defaults
+      _timeout:
+        default: 86400
+        description: Expiration timeout for the cache plugin data
+        env:
+          - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
+        ini:
+          - key: fact_caching_timeout
+            section: defaults
+        type: integer
+'''
+
+import os
+import tempfile
+
+from ansible.plugins.cache.jsonfile import CacheModule as JsonCacheModule
+
+
+class CacheModule(JsonCacheModule):
+
+    def set(self, key, value):
+
+        self._cache[key] = value
+
+        cachefile = self._get_cache_file_name(key)
+        tmpfile_handle, tmpfile_path = tempfile.mkstemp(dir=os.path.dirname(cachefile))
+        try:
+            try:
+                self._dump(value, tmpfile_path)
+            except (OSError, IOError) as e:
+                display.warning("error in '%s' cache plugin while trying to write to '%s' : %s" % (self.plugin_name, tmpfile_path, to_bytes(e)))
+            try:
+                os.chmod(tmpfile_path, 0o644)
+                os.rename(tmpfile_path, cachefile)
+            except (OSError, IOError) as e:
+                display.warning("error in '%s' cache plugin while trying to move '%s' to '%s' : %s" % (self.plugin_name, tmpfile_path, cachefile, to_bytes(e)))
+        finally:
+            try:
+                os.unlink(tmpfile_path)
+            except OSError:
+                pass