updated "show ntp" to use cgexec when management vrf is enabled (sonic-net#627)

Author: kannankvs

show/main.py

@@ -1539,11 +1539,28 @@ def bgp(verbose):
 #
 
 @cli.command()
+@click.pass_context
 @click.option('--verbose', is_flag=True, help="Enable verbose output")
-def ntp(verbose):
+def ntp(ctx, verbose):
     """Show NTP information"""
-    cmd = "ntpq -p -n"
-    run_command(cmd, display_cmd=verbose)
+    ntpcmd = "ntpq -p -n"
+    if ctx.invoked_subcommand is None:
+        cmd = 'sonic-cfggen -d --var-json "MGMT_VRF_CONFIG"'
+
+        p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        res = p.communicate()
+        if p.returncode == 0 :
+            p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            mvrf_dict = json.loads(p.stdout.read())
+
+            # if the mgmtVrfEnabled attribute is configured, check the value
+            # and print Enabled or Disabled accordingly.
+            if 'mgmtVrfEnabled' in mvrf_dict['vrf_global']:
+                if (mvrf_dict['vrf_global']['mgmtVrfEnabled'] == "true"):
+                    #ManagementVRF is enabled. Call ntpq using cgexec
+                    ntpcmd = "cgexec -g l3mdev:mgmt ntpq -p -n"
+    run_command(ntpcmd, display_cmd=verbose)
+
 
 
 #