[Bug 1411582] Re: [SRU] Azure data source should auto-detect ephemeral disk location

[Dan Watkins]

** Summary changed:

- Azure data source should auto-detect ephemeral disk location
+ [SRU] Azure data source should auto-detect ephemeral disk location

** Description changed:

- Currently we assume it will be /dev/sdb, but this may change. There is
- an example of how to handle this in the Azure Linux agent.
+ [Impact]
+ The Azure ephemeral disk will not necessarily remain at the same /dev/sd* location between reboots.  This means the drive may not be persistently mounted between reboots. 
+ 
+ [Test Case]
+ 1) Boot an Azure instance with a cloud-init including this fix.
+ 2) Ensure that the ephemeral disk is mounted at /mnt and formatted as ext4
+ 3) Ensure that /etc/fstab refers to a /dev/disk/... symlink, rather than a /dev/sd* device.
+ 
+ [Regression Potential]
+ We now use a udev rule to discover the location of the disk; we have been assured by Microsoft that this rule will always work, so regression potential is minimal.
+ 
+ [Original Report]
+ Currently we assume it will be /dev/sdb, but this may change. There is an example of how to handle this in the Azure Linux agent.
  
  To quote stevez in a comment on bug 1410835:
  
  Device names are not persistent in Linux and could change, so it is not
  guaranteed that the ephemeral disk will be called /dev/sdb. Ideally this
  should be auto-detected in cloud-init at runtime (for example, see
  DeviceForIdePort() in the Azure Linux agent).

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https://bugs.launchpad.net/bugs/1411582

Title:
  [SRU] Azure data source should auto-detect ephemeral disk location

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