Github user bvbharatk commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/784#discussion_r39275218
  
    --- Diff: systemvm/patches/debian/config/opt/cloud/bin/cs/CsAddress.py ---
    @@ -95,9 +95,25 @@ def get_control_if(self):
                     return ip
             return None
     
    +    def check_if_link_exists(self,dev):
    +        cmd="ip link show dev %s"%dev
    +        result=CsHelper.execute(cmd)
    +        if(len(result)!=0):
    +           return True
    +        else:
    +           return False
    +
    +    def check_if_link_up(self,dev):
    +        cmd="ip link show dev %s | tr '\n' ' ' | cut -d ' ' -f 9"%dev
    --- End diff --
    
    Hi, 
    we have used the subprocess command to find the state of the device in two 
more places. I have created a improvement ticket(CLOUDSTACK-8837) to track 
this. I will work on this later, until then 
    i guess the current changes will do.
    



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