snap-bootstrap fails after mounting ubuntu-seed partition

[Dimitri John Ledkov]

See attached log.txt and cmdline

I've built snap-bootstrap tool myself, as there is none available anywhere.

I did $ go build github.com/snapcore/snapd/cmd/snap-bootstrap

My snapd repo is at 2.42.2-1509-g18b0e3ce8a

First call to snap-bootstrap produced the "ubuntu-seed" partition mount.
Second call generate the attached traceback.

[Dimitri John Ledkov (xnox)]

How to reproduce on a devel machine without booting initrd or anything:

$ wget https://raw.githubusercontent.com/snapcore/models/master/ubuntu-core-20-amd64.model
$ ubuntu-image snap ubuntu-core-20-amd64.model
$ sudo modprobe nbd || :
$ which qemu-nbd || sudo apt install qemu-utils
$ qemu-nbd -d /dev/nbd0
$ qemu-nbd -c /dev/nbd0 -f raw ./pc.img

$ wget https://launchpadlibrarian.net/454241267/cmdline
$ sudo mount -o bind ./cmdline /proc/cmdline

$ sudo ./snap-bootstrap initramfs-mounts
$ systemd-mount `sudo ./snap-bootstrap initramfs-mounts`
(mounts seed)

$ sudo ./snap-bootstrap initramfs-mounts
....
traceback
....

[Michael Vogt (mvo)]

This is fixed once https://github.com/snapcore/snapd/pull/7838 lands.