[Bug 1411582] [NEW] Azure data source should auto-detect ephemeral disk location

[Daniel Watkins]

Public bug reported:

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).

** Affects: cloud-init (Ubuntu)
     Importance: Undecided
         Status: New

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

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

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