On Mon, 3 Aug 2009, Jim Paris wrote:
Joseph Mack NA3T wrote:
I'm going to be writing images to usb flash disks on 15 ports on multiple
hubs. I need to know which port on a hub is associated with which
/dev/sd?? device, so I can tell the user where to insert their flash key
and when the write is done.
..
What should I do to give the device a name determined from an absolute
location?
Check the links in /dev/disk/by-path,
Thanks didn't know about this.
The entries have specific info about the particular disk at
that location, whereas I want the rule to apply to any disk.
So it's not obvious how to use this info.
I've almost got everything I want however.
I started with systool, which is what worked a couple of
years ago. However apparently it recovers info which is not
visible to the udev rules system and I was using this info.
Instead starting with
# udevinfo -q path -n /dev/sda1
/block/sda/sda1
# udevinfo -a -p /block/sda/sda1
gives all the info usable by udev rules. Apparently you need
one rule specific to your device and one (or more?) rules
from device parents. This gave me rules like
KERNELS=="4-3:1.0", SUBSYSTEM=="block", NAME="flashL%n"
which work fine. I've now labeled all my ports by location.
There's rules about GROUP in one of my files (50-...)
KERNEL=="sd*[!0-9]", ATTR{removable}=="1", GROUP="plugdev"
KERNEL=="sd*[0-9]", ATTRS{removable}=="1", GROUP="plugdev"
I can't use these rules to apply a GROUP to flash disks in
the usb ports of interest, but not to flash disks in the
other port. Any ideas on assigning the GROUP?
Thanks Joe
--
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!
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