update_services only once per app, suppress umount warnings

usr/lib/python3.6/lxcmgr/lxcmgr.py

@@ -29,7 +29,8 @@ def mount_rootfs(container, layers, mountpoint):
         subprocess.run(['mount', '-t', 'overlay', '-o', 'upperdir={},lowerdir={},workdir={}'.format(layers[0], ':'.join(layers[1:]), olwork), 'none', mountpoint])
 
 def unmount_rootfs(mountpoint):
-    subprocess.run(['umount', '--quiet', mountpoint])
+    if os.path.exists(mountpoint):
+        subprocess.run(['umount', '--quiet', mountpoint])
 
 def clean_ephemeral_layer(container):
     # Cleans containers ephemeral layer. Called in lxc.hook.post-stop and lxc.hook.pre-start in case of unclean shutdown

usr/lib/python3.6/lxcmgr/pkgmgr.py

@@ -220,12 +220,14 @@ class PkgMgr:
                 image['depends'] = containers[container]['depends']
             lxcmgr.create_container(container, image)
             svcmgr.create_service(container, image)
+        svcmgr.update_services()
 
     def destroy_containers(self, containers):
         # Destroy LXC containers
         for container in containers:
             svcmgr.delete_service(container)
             lxcmgr.destroy_container(container)
+        svcmgr.update_services()
 
     @flock.flock_ex(REPO_LOCK)
     def uninstall_app(self, app):

usr/lib/python3.6/lxcmgr/svcmgr.py

@@ -19,7 +19,6 @@ def create_service(container, image):
     with open(service_file, 'w') as f:
         f.write(SERVICE.format(container=container, depends=depends, start_post=start_post))
     os.chmod(service_file, 0o755)
-    update_services()
 
 def delete_service(service):
     if is_service_started(service):
@@ -28,7 +27,6 @@ def delete_service(service):
         update_service_autostart(service, False)
     try:
         os.unlink(os.path.join(SERVICE_DIR, lxcize(service)))
-        update_services()
     except FileNotFoundError:
         pass