fungi: sry. that's other. this is loop4p2 log.
```
2022-04-12 04:56:57.445 | INFO diskimage_builder.block_device.utils [-] Calling [sudo mount /dev/mapper/loop4p2 /var/cache/nodepool/dib_tmp/dib_build.OuW0QXUa/mnt/]
2022-04-12 04:57:22.032 | + eval 'DEVICES=(' '[image0]=/dev/loop4' '[BSP]=/dev/mapper/loop4p1' '[root]=/dev/mapper/loop4p2' ')'
2022-04-12 04:57:22.032 | ++ DEVICES=([image0]=/dev/loop4 [BSP]=/dev/mapper/loop4p1 [root]=/dev/mapper/loop4p2)
```