[Bug 965735] Re: Casper can't find cow device when mdadm RAID disks are attached

[Launchpad Bug Tracker]

This bug was fixed in the package casper - 1.327

---------------
casper (1.327) quantal; urgency=low

  [ Tim Lunn ]
  * add gnome-shell favorites tweak to 25adduser
  * Add 16gdmnopasswd script, removes gdm password dialog for live user.

  [ Stéphane Graber ]
  * Fix casper when running on some RAID systems. (LP: #1047316, LP: #965735)
  * Apply patch by Tyler Gates to try and better handle dm devices, should help
    with the above change too. (LP: #865529)
  * Use /sys/class/net/ instead of hardcoded eth* devices.
    (LP: #905828, LP: #962546)
  * Allow overriding username/userfullname/hostname on the boot command line
    as is mentioned in the manpage but was never implemented.
    Note that when using persistence, those used for the first boot will be
    remembered through /etc/casper.conf (LP: #907482)
  * Reset oem-config/enable to false every boot. (LP: #838680)
  * Add Breaks/Replaces to ubiquity-casper to properly upgrade when both
    casper and ubiquity-casper are installed. (LP: #1046300)
  * Apply patch by cleary to avoid hang in 41apt_cdrom when .disk/info doesn't
    exist. (LP: #909919)
  * Eject by block device instead of mountpoint, this should avoid ejecting
    the cdrom on USB installations. (LP: #869238)
  * Add 'check' target to debian/rules based on ubiquity's (LP: #570243)
 -- Stephane Graber <stgraber at ubuntu.com>   Wed, 03 Oct 2012 17:46:39 -0400

** Changed in: casper (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/965735

Title:
  Casper can't find cow device when mdadm RAID disks are attached

Status in “casper” package in Ubuntu:
  Fix Released

Bug description:
  I created a casper 1.287.1 -based livecd using this guide:
  <https://help.ubuntu.com/community/LiveCDCustomization>. I'm using
  Oneiric on an i386 system. I have removed the "quiet" argument and
  added "nosplash" argument to the bootloader.

  When I boot my livecd on a system with no disks, or with non-RAID
  disks, it will boot completely with no errors. However, if I try to
  boot on a system with disks that have a RAID array created by mdadm,
  it will fail to an (initramfs) prompt on virtual console 1. If I
  change to VC7, I see an error: "No init found. Try passing init =
  bootarg". Here's a longer log file from VC7:

      Begin: Running /scripts/init-premount ... done
      Begin: Mounting root file system ... [  4.956222] sd 6:0:0:0: Attached scsi generic sg4 type 0
      [  4.956342] sd 6:0:0:1: Attached scsi generic sg5 type 0
      [  4.956437] sd 6:0:0:2: Attached scsi generic sg6 type 0
      [  4.956543] sd 6:0:0:3: Attached scsi generic sg7 type 0
      [  4.964779] sd 6:0:0:0: [sdd] Attached SCSI removable disk
      [  4.965530] sd 6:0:0:0: [sde] Attached SCSI removable disk
      [  4.966415] sd 6:0:0:0: [sdf] Attached SCSI removable disk
      [  4.977920] sd 6:0:0:0: [sdg] Attached SCSI removable disk
      cp: can't create '/root/var/log/': Is a directory
      cp: can't create '/root/etc/': Is a directory
      done.
      Begin: Running /sripts/init-bottom ... mount: mounting /dev on /root/dev failed: No such file or directory
      done.
      mount: mounting /sys on /root/sys failed: No such file or directory
      mount: mounting /proc on /root/proc failed: nNo such file or directory
      Target filesystem doesn't have requested /sbin/init.
      No init found. Try passing init= bootarg

  From the (initramfs) prompt, I can see that the /cow filesystem was
  never mounted. If I run ". /scripts/casper-helpers", and then
  "find_cow_device", it returns "/dev/md127".

  When I run "find_cow_device" from a working system (NOT in initramfs,
  though - I'm not sure how to make it drop me a prompt), it returns
  "/dev/ram0".

  Has anyone else encountered this? Any help is much appreciated.

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