[PATCH] - libstore: Add prefix @ to device to pass master device

[Damien Zammit]

For compatibility with rump disk drivers,
we need a way to pass the master device through the `-T typed device:` 
parameter of storeio.
Instead of adding a new field, this patch allows the device field to be of the 
form:

        @/path/to/master:/path/to/device

So for example, with this patch I can call:

        settrans /dev/wd0s2 /hurd/storeio -T typed 
part:2:device:@/dev/rump:/dev/wd0

This allows passing the /dev/rump master device (not the mach kernel one) to 
storeio
and still pass the device /dev/wd0 to open the device within rump.

However without the @ prefix, it still falls back to opening the regular master 
device.
 
Thoughts?

Damien

0001-libstore-alt-master.patch
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