[Bug 1062737] Re: hybrid images do not include a valid GPT

[Steve Langasek]

Thanks for your work on this, Thomas.  My understanding is that for the
moment we can just drop the -partition_offset flag without causing any
regressions in functionality, so that's what I think we should do since
that's the easiest and we're very close to release deadlines.  I've
committed this change to the build script repo for now.

We can revisit enabling this option after 12.10 when we pull in xorriso
1.2.5, or if any problems do turn up in testing with -partition_offset
disabled (which seems unlikely).

** Changed in: ubuntu-cdimage
       Status: New => Fix Released

** Also affects: libisoburn (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: libisoburn (Ubuntu)
       Status: New => Triaged

** Package changed: libisoburn (Ubuntu) => libisofs (Ubuntu)

** Changed in: libisofs (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1062737

Title:
  hybrid images do not include a valid GPT

Status in Ubuntu CD image build software:
  Fix Released
Status in “libisofs” package in Ubuntu:
  Triaged

Bug description:
  The insyde UEFI firmware implementation does not see the GPT on the
  hybrid images generated on nusakan (e.g., the 12.10 beta2 image).
  This appears to be consistent with what both gdisk and parted show:

  $ gdisk -l ~/devel/iso/ubuntu-12.10-beta2-desktop-amd64.iso 
  GPT fdisk (gdisk) version 0.8.5

  Partition table scan:
    MBR: MBR only
    BSD: not present
    APM: not present
    GPT: not present

  
  ***************************************************************
  Found invalid GPT and valid MBR; converting MBR to GPT format.
  ***************************************************************

  Disk /home/vorlon/devel/iso/ubuntu-12.10-beta2-desktop-amd64.iso: 1548288 sectors, 756.0 MiB
  Logical sector size: 512 bytes
  Disk identifier (GUID): 1ADDF8C9-5CE1-41A4-9124-2CC80EED991F
  Partition table holds up to 128 entries
  First usable sector is 34, last usable sector is 1548254
  Partitions will be aligned on 2048-sector boundaries
  Total free space is 1548221 sectors (756.0 MiB)

  Number  Start (sector)    End (sector)  Size       Code  Name
  $

  Removing the -partition_offset 16 option from the xorriso commandline
  is sufficient to generate an image with a recognizable partition
  table; but I imagine this causes other problems for hybrid systems.

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