interfaces: add raw-volume interface for access to partitions (#7768)
While the block-devices interface provides access to raw disks, some
applications need access to disk partitions at the block level. This
interface provides this access. Since read access gives the snap access
to all data on the device and write access allows changing the contents
of the disk partition, this interface is considered a "super-privileged"
interface since it grants device ownership to the snap.
This is needed for enabling certain UC20 devices and needs to be in 2.43.
cmd/snapd-generator: fix unit name for non /snap mount locations
When snap mount directory is different from /snap, eg. /var/lib/snapd/snap like
we have on Fedora, the generated unit name should correspond to the output of
`systemd-escape -p <path>`. In case of Fedora, it should be var-lib-snapd-snap.
Signed-off-by: Maciej Borzecki <email address hidden>
