[Bug 1646881] Re: Enable pre-caching of snaps in a classic chroot

[Dimitri John Ledkov]

The answer is:
base64.urlsafe_b64encode(binascii.unhexlify(s))

where s, is the sha3 header responce from the store, which is available
to the snap-tool.

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https://bugs.launchpad.net/bugs/1646881

Title:
  Enable pre-caching of snaps in a classic chroot

Status in cloud-images:
  New
Status in snapd:
  Incomplete
Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  We have been asked to pre-cache certain snaps in to images that we
  publish to Certified Public Cloud partners, to (potentially) reduce
  the amount of download required to get started using snaps.

  We build the images using an un-booted chroot, so we would need to be
  able to do this without a running systemd/snapd.

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