Automatically find mount points

[ewxrjk]

Currently the operator has to specify where devices may be found using the store command.

Alternative 1:

Have rsbackup automatically check some or all mount points. store would still be required for some possible use cases but it would simplify management in the common configuration where all backup devices correspond directly to filesystems.

Modern desktop systems automatically mount whatever mass storage is attached to them, so with this feature a physically present attacker may 'steal' a backup by attaching a disk with the right device-id file. Some mitigation for this problem must be included if this approach is adopted..

Alternative 2:

Have the store directive take a glob pattern (or introduce a new directive with glob syntax). This allows much more fine-grained operator control of where stores are found, but still avoids the need to explicitly list them all.