[Bug 49788] mountmgr is no longer detecting SCSI devices

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49788

--- Comment #6 from TasosSah <winebugzilla at tasossah.com> ---
A few notes.
It's not as easy as I thought to get the sg path from /sys/bus/scsi.

At first I assumed there would be a symlink to it, but this did not seem to be
the case.
It is possible to parse /sys/bus/scsi/devices/xx:0:x:0/generic/uevent to
extract the DEVNAME=sgX, which doesn't seem like a great idea.

One could otherwise call readlink on /sys/bus/scsi/devices/xx:0:x:0/generic
which is a symlink to a path that contains "sgX" in its name, but this is quite
a terrible idea in my opinion, since we'd need to parse the path returned.

At that point, I assumed I could use libudev to go through all the devices and
add a match for scsi bus, target id, and logical unit, but it appears udev did
not have this information. (Checked using udevadm info -a
/sys/devices/platform/[...]/scsi_generic/sgX, which is the path returned when
adding a udev enum match for the scsi_generic subsystem.)

I resorted to building the path manually and calling udev to return the sgX
path.
Perhaps there is a better way to do this, but I was not successful in finding
it.

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