configuring pg install sources

hooks/pg_dir_hooks.py

@@ -40,7 +40,8 @@ from pg_dir_utils import (
     fabric_interface_changed,
     load_iptables,
     restart_on_change,
-    director_cluster_ready
+    director_cluster_ready,
+    configure_pg_sources
 )
 
 hooks = Hooks()
@@ -135,6 +136,9 @@ def config_changed():
             charm_config.changed('iovisor-build')):
         status_set('maintenance', 'Upgrading apt packages')
         stop_pg()
+        if charm_config.changed('install_sources'):
+            if not configure_pg_sources():
+                log('IOError: /etc/apt/sources.list couldn\'t be updated')
         configure_sources(update=True)
         pkgs = determine_packages()
         for pkg in pkgs:

hooks/pg_dir_utils.py

@@ -42,6 +42,7 @@ from charmhelpers.contrib.openstack.utils import (
     os_release,
 )
 
+SOURCES_LIST = '/etc/apt/sources.list'
 LXC_CONF = '/etc/libvirt/lxc.conf'
 TEMPLATES = 'templates/'
 PG_LXC_DATA_PATH = '/var/lib/libvirt/filesystems/plumgrid-data'
@@ -88,6 +89,23 @@ BASE_RESOURCE_MAP = OrderedDict([
 ])
 
 
+def configure_pg_sources():
+    '''
+    Returns true if install sources is updated in sources.list file
+    '''
+    try:
+        with open(SOURCES_LIST, 'r+') as sources:
+            all_lines = sources.readlines()
+            sources.seek(0)
+            for i in (line for line in all_lines if "plumgrid" not in line):
+                sources.write(i)
+            sources.truncate()
+        sources.close()
+        return True
+    except IOError:
+        return False
+
+
 def determine_packages():
     '''
     Returns list of packages required by PLUMgrid director as specified