[Bug 2083685] Re: Utilize SNAPSHOT_SERVICE_TIMESTAMP When Configuring Repositories

[John Chittum]

I attempted a build applying the linked patch, and `germinate` did not
like what was happening. it seemed to download most of the correct files
but something was missing. I've personally never tried `germinate` from
the snapshot archive, so I can't state if it's user error when setting
up the patch and passing in timestamp, if it's an ephemeral issue, or if
there's something else at play here.

** Attachment added: "build_log.amd64.qcow2.txt"
   https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/2083685/+attachment/5825997/+files/build_log.amd64.qcow2.txt

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https://bugs.launchpad.net/bugs/2083685

Title:
  Utilize SNAPSHOT_SERVICE_TIMESTAMP When Configuring Repositories

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Focal:
  New
Status in livecd-rootfs source package in Jammy:
  New
Status in livecd-rootfs source package in Noble:
  New
Status in livecd-rootfs source package in Oracular:
  New

Bug description:
  # Background

  as of 20241004 (RIP w9xn), $SNAPSHOT_SERVICE_TIMESTAMP has been made
  available as an official environment variable in launchpad livefs
  builds. When a build is triggered with in launchpad with the metadata
  snapshot_service_timestamp, $SNAPSHOT_SERVICE_TIMESTAMP will be
  populated with the provided timestamp. This allows livecd-rootfs to
  configure the initial mirrors to use the snapshot service rather than
  the current overwrite cases.

  documentation on the snapshot service: https://snapshot.ubuntu.com/

  proposed patch by mwhudson: https://paste.ubuntu.com/p/5RtpSKm2QQ/

  This is only to enable the snapshot service in one variable. There are
  other variables throughout livecd-rootfs that reference archives which
  may need to be investigated

  LB_PARENT_MIRROR_BINARY
  LB_PARENT_MIRROR_BINARY_VOLATILE
  LB_PARENT_MIRROR_BINARY_SECURITY

  Section of code around $EXTRA_PPAS : livecd-rootfs/live-
  build/auto/config:1519 [0]

  Any hooks that add PPAs or change the default apt configurations may
  need to be investigated as well. if these are housed in private areas,
  and nested (looking at you CPC), then those will need to be handled by
  individual teams.

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