[Bug 1570123] [NEW] partman-auto-raid fails when there is an 'inactive' raid

[Shashank Sahni]

Public bug reported:

The logic that partman-auto-raid uses in raid-autocfg to fetch the
current RAID device number(if any), greps for 'active' in /proc/mdstat.
In scenarios where an inactive raid exists due to one of the disks(being
reused), this greps the entire inactive raid string. As a result,
instead of returning the mdraid device number, it fetches the string
"md127 : inactive sdj[2](s)" and tries to append it to "/dev/md" and
fails creating the requested RAID device.

** Affects: partman-auto-raid (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1570123

Title:
  partman-auto-raid fails when there is an 'inactive' raid

Status in partman-auto-raid package in Ubuntu:
  New

Bug description:
  The logic that partman-auto-raid uses in raid-autocfg to fetch the
  current RAID device number(if any), greps for 'active' in
  /proc/mdstat. In scenarios where an inactive raid exists due to one of
  the disks(being reused), this greps the entire inactive raid string.
  As a result, instead of returning the mdraid device number, it fetches
  the string "md127 : inactive sdj[2](s)" and tries to append it to
  "/dev/md" and fails creating the requested RAID device.

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