[Bug 1479610] Re: [SRU] walinuxagent regression on dhcp configuration

[Ben Howard]

** Description changed:

- Regression from Bug #1449369:
+ SRU JUSTIFICATION
+ 
+ [IMPACT] The backport of WALinuxAgent from 2.0.13 in Wily as part of bug
+ #1449369, broke the DHCP configuration for Ubuntu 12.04 on Azure.
+ Instances that boot with WALinuxAgent on Azure will use an invalid value
+ of "send host-name" resulting in hostname resolution failures
+ 
+ [FIX] Update debian/postinst to use:
+ sed -i 's|^send host-name = gethostname();|send host-name "<hostname>";|g' /etc/dhcp/dhclient.conf
+ 
+ This reverts the invalid behavior.
+ 
+ [TEST]
+ 1. Boot up Azure instance with WALinuxAgent 2.0.13
+ 2. Confirm that "sudo /bin/true" yields "sudo: unable to resolve host ..."
+ 3. Apply new package from -proposed
+ 4. Reboot
+ 5. Confirm that "sudo /bin/true" does not complain about hostname resolution. 
+ 
+ [ORIGINAL REPORT]
  
  The /etc/dhcp/dhclient.conf file is misconfigured. The postinst for
  WALinuxAgent for Trusty and later includes:
  
  if [ "$1" = "configure" ]; then
-     # fix for LP: 1268050
-     sed -i 's|^send host-name "<hostname>";|send host-name = gethostname();|g' /etc/dhcp/dhclient.conf
+     # fix for LP: 1268050
+     sed -i 's|^send host-name "<hostname>";|send host-name = gethostname();|g' /etc/dhcp/dhclient.conf
  fi
  
  This postinst is incorrect for 12.04. This regression was introduced
  when WALinuxAgent was updated from 2.0.8 to 2.0.13.

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https://bugs.launchpad.net/bugs/1479610

Title:
  [SRU] walinuxagent regression on dhcp configuration

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