[Bug 1864426] Update Released

[Brian Murray]

The verification of the Stable Release Update for live-build has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1864426

Title:
  [SRU][live-build] can not customize the mkisoimage option

Status in OEM Priority Project:
  Fix Committed
Status in OEM Priority Project focal series:
  Fix Committed
Status in live-build package in Ubuntu:
  Fix Released
Status in live-build source package in Focal:
  Fix Released

Bug description:
  [Impact]

  Although live build has been used in both oem and foundation team, but
  the main different is that:

  --Foundation--
  Only for squashfs, cd-image will be used after that, the iso image created by live build will not be used directly.

  --OEM--
  Oem team uses live build in whole process which includes several binary hooks, and the final image created by live build will be used directly.

  So the problem is that currently the iso image which created by live build doesn't support uefi boot,
  so when we build a support uefi bootable image, the mkisoimage needs extra options.

  [Test Case]
  With below options in any live build config (oem team put it in <config>/common), an uefi bootable image can be built.

  ISOHYBRID_OPTIONS="--uefi"
  GENISOIMAGE_OPTIONS_EXTRA="-eltorito-alt-boot -efi-boot boot/grub/efi.img -no-emul-boot -joliet-long"

  [Regression Potential]
  Low, oem team has been using this patch for years (from 2012),
  we haven't found any potential regression.

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