[Bug 1990884] Re: snap-preseed hangs indefinitely with firefox snap

[Ubuntu QA Website]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/1990884

** Tags added: iso-testing

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Title:
  snap-preseed hangs indefinitely with firefox snap

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in snapd package in Ubuntu:
  Confirmed

Bug description:
  During our automated image builds, we found a scenario where `snap-
  preseed` was hanging indefinitely. The logs are as follows:

  ```
  sudo /usr/lib/snapd/snap-preseed /home/jawn-smith/sandbox/chroot/
  ubuntu classic preseedingstarting to preseed root: /home/jawn-smith/sandbox/chroot
  using snapd binary: /usr/lib/snapd/snapd (2.57.1+22.10.1)
  AppArmor status: apparmor is enabled and all features are available
  2022/09/26 19:56:40.922864 main.go:57: running for preseeding
  2022/09/26 19:56:40.923469 overlord.go:263: Acquiring state lock file
  2022/09/26 19:56:40.923655 overlord.go:268: Acquired state lock file
  2022/09/26 19:56:40.930761 daemon.go:247: started snapd/2.57.1+22.10.1 (series 16; classic) ubuntu/22.10 (amd64) linux/5.19.0-15-generic.
  2022/09/26 19:56:40.936802 daemon.go:340: adjusting startup timeout by 30s (pessimistic estimate of 30s plus 5s per snap)
  2022/09/26 19:56:41.116159 helpers.go:147: error trying to compare the snap system key: system-key missing on disk
  ```

  I was able to reproduce the behavior by running the following commands
  on a kinetic system:

  ```
  sudo debootstrap --variant=minbase --arch=amd64 kinetic chroot
  sudo snap prepare-image --arch=amd64 --snap=core --snap=firefox --snap=core20 --snap=gtk-common-themes --snap=gnome-3-38-2004 --snap=bare --classic generic.model chroot
  for mountpoint in /dev /proc /sys /sys/kernel/security/; do sudo mount --bind $mountpoint chroot/$mountpoint; done
  sudo chroot chroot apt install -y squashfs-tools snapd
  sudo /usr/lib/snapd/snap-preseed --reset <full path to chroot>
  sudo /usr/lib/snapd/snap-preseed <full path to chroot>
  ```

  In this scenario I am using the following generic.model:

  ```
  type: model
  authority-id: generic
  series: 16
  brand-id: generic
  model: generic-classic
  classic: true
  timestamp: 2017-07-27T00:00:00.0Z
  sign-key-sha3-384: d-JcZF9nD9eBw7bwMnH61x-bklnQOhQud1Is6o_cn2wTj8EYDi9musrIT9z2MdAa

  AcLBXAQAAQoABgUCWYuXiAAKCRAdLQyY+/mCiST0D/0XGQauzV2bbTEy6DkrR1jlNbI6x8vfIdS8
  KvEWYvzOWNhNlVSfwNOkFjs3uMHgCO6/fCg03wGXTyV9D7ZgrMeUzWrYp6EmXk8/LQSaBnff86XO
  4/vYyfyvEYavhF0kQ6QGg8Cqr0EaMyw0x9/zWEO/Ll9fH/8nv9qcQq8N4AbebNvNxtGsCmJuXpSe
  2rxl3Dw8XarYBmqgcBQhXxRNpa6/AgaTNBpPOTqgNA8ZtmbZwYLuaFjpZP410aJSs+evSKepy/ce
  +zTA7RB3384YQVeZDdTudX2fGtuCnBZBAJ+NYlk0t8VFXxyOhyMSXeylSpNSx4pCqmUZRyaf5SDS
  g1XxJet4IP0stZH1SfPOwc9oE81/bJlKsb9QIQKQRewvtUCLfe9a6Vy/CYd2elvcWOmeANVrJK0m
  nRaz6VBm09RJTuwUT6vNugXSOCeF7W3WN1RHJuex0zw+nP3eCehxFSr33YrVniaA7zGfjXvS8tKx
  AINNQB4g2fpfet4na6lPPMYM41WHIHPCMTz/fJQ6dZBSEg6UUZ/GiQhGEfWPBteK7yd9pQ8qB3fj
  ER4UvKnR7hcVI26e3NGNkXP5kp0SFCkV5NQs8rzXzokpB7p/V5Pnqp3Km6wu45cU6UiTZFhR2IMT
  l+6AMtrS4gDGHktOhwfmOMWqmhvR/INF+TjaWbsB6g==
  ```

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