[Bug 520500] Re: booting iso from stick via grub2 loopback gets stuck on particular crypt-luks partition

[debugger]

*** This bug is a duplicate of bug 910924 ***
    https://bugs.launchpad.net/bugs/910924

** This bug has been marked a duplicate of bug 910924
   livecd: initrd: scripts/casper-helpers: fstype returns ext3 on luks container

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https://bugs.launchpad.net/bugs/520500

Title:
  booting iso from stick via grub2 loopback gets stuck on particular
  crypt-luks partition

Status in “iso-scan” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: iso-scan

  Booting lucid desktop iso 20100210 64 bit from usb-stick via grub2 loopback does not work. It says "mounting /dev/sda5 on /isodevice failed: Invalid argument" and I get dropped to the shell. /dev/sda5 is not where the iso is. It happens to be a crypt-luks partition.
  Using Bug #454456 as recipe I was able to continue the boot process by using the following commands:
  (initramfs) mount -t ext4 /dev/disk/by-label/verbatim /isodevice
  (initramfs) echo "LIVEMEDIA=/isodevice/boot/isostick/ubuntu/lucid-desktop-amd64.iso /" >> /conf/param.conf
  (initramfs) echo "LIVEMEDIA_OFFSET=0" >> /conf/param.conf
  (initramfs) exit

  Booting the iso via loopback from the hard disk works fine, as does booting via loopback from this usb-stick on a different computer with a far simpler partition layout (no crypt-luks partiton among other things).
  I have then gone and made a luks partition on the computer with the simpler layout. Booting from the stick still worked.
  I have then overwritten the offending luks partition on the first computer with an ext4 filesystem. Now booting from the stick works.

  suspicion:
  iso-scan/filename=/boot/isostick/ubuntu/lucid-desktop-amd64.iso does give the wrong partition to the boot process, getting stuck on that particular crypt-luks partition.

  the first bit of casper.log after boot with manual help:
  Begin: Running /scripts/casper-premount ...
  Done.
  Begin: ...waiting for devs... ...
  Done.
  stdin: error 0
  mount: mounting /dev/sda5 on /isodevice failed: Invalid argument
  Cannot mount /dev/sda5 on /isodevice
  Done.
  Done.
  Begin: Creating debconf-communicate fifo mechanism ...
  Done.
  Begin: Running /scripts/casper-bottom ...
  Begin: Moving mount points... ...
  Done.
  Begin: Adding live session user... ...

  The layout:
  # partition table of /dev/sda
  unit: sectors

  /dev/sda1 : start=       63, size= 36419292, Id=83, bootable
  /dev/sda2 : start=        0, size=        0, Id= 0
  /dev/sda3 : start= 36419355, size=276157350, Id= 5
  /dev/sda4 : start=        0, size=        0, Id= 0
  /dev/sda5 : start=114543513, size= 60998742, Id=83
  /dev/sda6 : start=175542318, size= 86879457, Id=83
  /dev/sda7 : start= 36419481, size=  5012154, Id=82
  /dev/sda8 : start=262421838, size= 20322162, Id=83
  /dev/sda9 : start=282744063, size= 19534977, Id=83
  /dev/sda10: start= 41431698, size= 45062262, Id=83

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