udisks2 problem in Guymager - How to get Linux device for drives?

[Guy]

Hello List,

I sent this email to David Zeuthen initially - and recommended to post 
my udisks2 problem here.

I need to adapt my program "Guymager" (Debian package of the same name) 
to udisks2. After I implemented the basic DBus functionality, I found 
the following problem:

- Guymager is only interested in real drives. So, I only consider 
/org/freedesktop/UDisks2/drives/... (and not 
/org/freedesktop/UDisks2/block_devices/...)

- Guymager needs to find out the Linux device name for each drive. That 
would be /dev/sda, for example.

- Now comes my problem: How can I find out, which Linux device name 
belongs to which drive? For doing so, I would have to look at the 
block_devices, property "Device" in interface 
org.freedesktop.UDisks2.Block.

However, the only matching criteria I see is the "Drive" property, but 
there are many block_devices with that property: /dev/sda, /dev/sda1, 
/dev/sda2, ...

How do I choose the right one? Guymager could maybe take the one with 
the shortest name, but I'm not sure if that really is safe in each and 
every situation and every Linux system. What misses in my eyes is a 
property named "Device" (in the interface org.freedesktop.UDisks2.Drive) 
for the drives under /org/freedesktop/UDisks2/drives/...

What do you think?

Thank you in advance!

Guy Voncken


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