Snap installed in lxc can't run apps/services after refresh

[Kyle Fazzari]

Installing a snap within an lxc container works fine (services launch as expected, apps run fine, etc.). However, a subsequent refresh of said in-container snap results in every service dying and every attempt to run an app ending with a message like this (using the nextcloud snap as an example):

    cannot snap-exec: cannot read info for "nextcloud": cannot find installed snap "nextcloud" at revision 1311

(note that revision 1311 is the new revision that was just installed via the refresh.)

A reboot of the container fixes things: the services come back up, and apps are runnable again. However, that's not a workaround when you consider that the `configure` hook runs as part of the installation process. It fails with the same error, and the snap rolls back, which means any snap using the `configure` hook can never be updated if it's running within lxc. Reboots don't help.

Discussion where this issue was discovered: https://forum.snapcraft.io/t/cannot-update-nextcloud-to-revision-introducing-configure-hook-inside-lxd/556

[Kyle Fazzari (kyrofa)]

The bug status here hasn't moved, but I can no longer reproduce it, so I'll mark it fix released.