Comment 6 for bug 1680574

How about something to this effect?

$ ubuntu-image -O /tmp/out pc-amd64-model.assertion
$ ls /tmp/out
pc.img seed.manifest snaps.manifest
$ cat /tmp/out/seed.manifest
core 1640
pc 19
pc-kernel 60
$ cat /tmp/out/snaps.manifest
core 1640
pc-kernel 60