Comment 1 for bug 2034585

Hi, thanks for raising this,

Reading the dm-crypt interface, I see the devices allowed to access through this one is:

/dev/dm-[0-9]* rwk,

I think you could try also connecting your snap to the block_devices interface which allows access to

# Access to raw devices, not individual partitions
/dev/hd[a-t] rwk, # IDE, MFM, RLL
/dev/sd{,[a-h]}[a-z] rwk, # SCSI
/dev/sdi[a-v] rwk, # SCSI continued
/dev/i2o/hd{,[a-c]}[a-z] rwk, # I2O hard disk
/dev/i2o/hdd[a-x] rwk, # I2O hard disk continued
/dev/mmcblk[0-9]{,[0-9],[0-9][0-9]} rwk, # MMC (up to 1000 devices)
/dev/vd[a-z] rwk, # virtio
/dev/loop[0-9]{,[0-9],[0-9][0-9]} rwk, # loopback (up to 1000 devices)
/dev/loop-control rw, # loopback control