[Bug 1613030] [NEW] linux-boot-prober returns wrong root= kernel parameter on lvs root partition

[pepa65]

Public bug reported:

When linux-boot-prober is invoked with /dev/mapper/VOLUMEGROUP-VOLUME2
from a linux root partition on /dev/mapper/VOLUMEGROUP-VOLUME1 the last
field returned has "root=/dev/mapper/VOLUMEGROUP-VOLUME1 ro recovery
nomodeset" while the first field (the requested root partition) is
"/dev/mapper/VOLUMEGROUP-VOLUME2"

This has been the case for many years... Currently on
1. Ubuntu 16.04.1 LTS
2. os-prober 1.70ubuntu3
3. It should have root=/dev/mapper/VOLUMEGROUP-VOLUME2
4. It now returns root=/dev/mapper/VOLUMEGROUP-VOLUME1

** Affects: os-prober (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: grub lvm2 os-prober

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https://bugs.launchpad.net/bugs/1613030

Title:
  linux-boot-prober returns wrong root= kernel parameter on lvs root
  partition

Status in os-prober package in Ubuntu:
  New

Bug description:
  When linux-boot-prober is invoked with /dev/mapper/VOLUMEGROUP-VOLUME2
  from a linux root partition on /dev/mapper/VOLUMEGROUP-VOLUME1 the
  last field returned has "root=/dev/mapper/VOLUMEGROUP-VOLUME1 ro
  recovery nomodeset" while the first field (the requested root
  partition) is "/dev/mapper/VOLUMEGROUP-VOLUME2"

  This has been the case for many years... Currently on
  1. Ubuntu 16.04.1 LTS
  2. os-prober 1.70ubuntu3
  3. It should have root=/dev/mapper/VOLUMEGROUP-VOLUME2
  4. It now returns root=/dev/mapper/VOLUMEGROUP-VOLUME1

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