[Bug 1520575] Re: casper-sn persistence fails in 14.04.3, 15.10

[a1bert]

the same here, the new version of casper is not working properly:

there is not only problem with assembling root FS as reported above, but
I am also not able to boot with persistent boot cmd:

reproduce:

-syslinuxed vfat  USB stick:  /casper/filesystem.squashfs,initrd.gz,vmlinuz
-persistent keyword on cmdline
-boot ends up in busybox

without "persistent" keyword, system boots ok

CAUSE:

initramfs-tools/scripts/casper: find_cow_device() called from
setup_unionfs("/cdrom/casper","/root"), unmounts previously mounted
/cdrom during scanning for casper-rw; /cdrom/casper/filesystem.squashfs
is then not accessible for mount ...



** Patch added: "dirty fix"
   https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1520575/+attachment/4588796/+files/casper-persistent-boot.patch

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https://bugs.launchpad.net/bugs/1520575

Title:
  casper-sn persistence fails in 14.04.3, 15.10

Status in casper package in Ubuntu:
  Confirmed

Bug description:
  
  Reproducing:
  Create fat32 bootable pendrive having the below  grub entry

  boot.cfg
  menuentry "Run ubuntu-15.10-desktop-amd64 " {
   loopback loop /ubuntu-15.10-desktop-amd64.iso
   linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=/ubuntu-15.10-desktop-amd64.iso persistent show-cow --
   initrd (loop)/casper/initrd.lz
  }

  iso file is an unmodified unutu iso.

  After boot into desktop, running
  # echo TEST > /etc/test-file
  # casper-snapshot  
  # cp /mnt/casper-snapshot/casper-sn.cpio.gz /media/ubuntu/<PENDRIVE_NAME>
  # shutdown -r now

  Boot again the same way into desktop.
  # ls -l /etc/test-file
  ls: cannot access /etc/test-file: No such file or directory

  
  Hint:
  #cat /upper/etc/test-file
  TEST

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