guestmount failing on ubuntu

[NathanTP]

Marshal may fail with a somewhat cryptic error on ubuntu systems. This is a known issue and it's being documented here for posterity:

Reproduce:
./marshal build test/command.json

Symptom (e.g.):

subprocess.CalledProcessError: Command 'guestmount -a /scratch/nathanp/firesim/sw/firesim-software/images/br-base.img -m /dev/sda /scratch/nathanp/firesim/sw/firesim-software/disk-mount' returned non-zero exit status 1

In the detailed logs you'll see:

libguestfs: error: /usr/bin/supermin exited with error status 1.

This is an issue with guestmount and ubuntu (marshal uses guestmount to manipulate target filesystems without requiring sudo). The bugs are documented here and here. The solution is to add read privileges to the kernel (e.g. sudo chmod +r /boot/vmlinuz-*).

[NathanTP]

Closed because we can't fix it from mashal, it must be fixed by your sysadmin.