The deploy failed with:
blkid: invalid offset argument '/dev/vda2': invalid argument
error: /dev/vda2 is not a btrfs filesystem
`blkid -p -O "$DEV"` passed the device path to --offset, so the probe
always failed. Use a proper TYPE tag probe:
blkid -p -s TYPE -o value "$DEV" # -> "btrfs"
The guard now triggers only when the filesystem type is genuinely not
btrfs. The UUID lookups in deploy-disk.sh (-s UUID -o value) were already
correct.
- init.sh: creates the @ / @home / @log / @snapshots subvolume layout
on a target device (the installer step).
- snapshot.sh: scheduled read-only snapshots with pruning, installed as
/usr/local/sbin/arcline-snapshot.
- rollback.sh: safe boot-to-snapshot rollback that refuses to touch the
live @ and promotes a snapshot atomically.
