geo-rep: Upgrading config file to new version

- configuration handling is enhanced with patch
https://review.gluster.org/#/c/glusterfs/+/18257/
- hence, the old configurations are not applied when
Geo-rep session is created in the old version and upgraded.

This patch solves the issue. It,
- checks if the config file is old.
- parses required values from old config file and stores in new
  config file, which ensures that configerations are applied on
  upgrade.
- stores old config file as backup.
- handles changes in options introduced in
  https://review.gluster.org/#/c/glusterfs/+/18257/

Backport of:
 > Patch: https://review.gluster.org/22894
 > BUG: bz#1707731
 > Change-Id: Iad8da6c1e1ae8ecf7c84dfdf8ea3ac6966d8a2a0
 > Signed-off-by: Shwetha K Acharya <sacharya@redhat.com>

updates: bz#1764171
Change-Id: Iad8da6c1e1ae8ecf7c84dfdf8ea3ac6966d8a2a0
Signed-off-by: Kotresh HR <khiremat@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/geo-replication/syncdaemon/gsyncd.py b/geo-replication/syncdaemon/gsyncd.py
index effe0ce6aa2..a4c6f32f135 100644
--- a/geo-replication/syncdaemon/gsyncd.py
+++ b/geo-replication/syncdaemon/gsyncd.py
@@ -253,6 +253,11 @@ def main():
     if args.subcmd == "slave":
         override_from_args = True
 
+    if args.subcmd == "monitor":
+        ret = gconf.is_config_file_old(config_file, args.master, extra_tmpl_args["slavevol"])
+        if ret is not None:
+           gconf.config_upgrade(config_file, ret)
+
     # Load Config file
     gconf.load(GLUSTERFS_CONFDIR + "/gsyncd.conf",
                config_file,