fungi: find this
```
2022-04-12 02:54:28.596 | INFO diskimage_builder.block_device.utils [-] Calling [sudo mkfs -t ext4 -i 4096 -J size=64 -L cloudimg-rootfs -U 64dec52c-3413-401e-8522-faa4767da5f7 -q /dev/mapper/loop2p3]
2022-04-12 02:54:51.616 | + eval 'DEVICES=(' '[image0]=/dev/loop2' '[ESP]=/dev/mapper/loop2p1' '[BSP]=/dev/mapper/loop2p2' '[root]=/dev/mapper/loop2p3' ')'
```