[Bug 1562994] Re: overlayfs multiple read only file system mount fail

[Mathieu Trudel-Lapierre]

*** This bug is a duplicate of bug 1561606 ***
    https://bugs.launchpad.net/bugs/1561606

Seems to me like this is basically a duplicate of bug 1561606; where the
requirement is to support multiple squashfs images layered on top of
each other.

** This bug has been marked a duplicate of bug 1561606
   Re-enable multi-layer squashfs support

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https://bugs.launchpad.net/bugs/1562994

Title:
  overlayfs multiple read only file system mount fail

Status in casper package in Ubuntu:
  New

Bug description:
  BUG DESCRIPTION:

  when casper try to mount multiple read-only file systems using overlay unionfs,
  the second mount will fail because the upper directory must be writable.

  SOLUTION:

  use multiple lower directories to replace read-only upper directories

  WORKAROUND:

  use option: union=aufs

  BUG LOCATION:

  In Kubuntu 15.10 LiveCD
  in file /casper/initrd.lz
  in file /scripts/casper
  in function setup_unionfs
  somewhere after line '# Record the format we are using for this mount.'

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