udev devname events have less environment

[Andreas Jellinghaus <aj@dungeon.inka.de>]

maybe other people will run into this problem too, so I'm posting
it here:

for the old /proc/bus/usb filesystem I see events resulting
in environment like this (even if there is no usbfs mounted):
export ACTION="add"
export DEVICE="/proc/bus/usb/002/015"
export DEVPATH="/devices/pci0000:00/0000:00:13.0/usb2/2-1/2-1:1.0"
export INTERFACE="0/0/0"
export MODALIAS="usb:v0973p0001d0100dcFFdsc00dp00ic00isc00ip00"
export OLDPWD
export PHYSDEVBUS="usb"
export PRODUCT="973/1/100"
export PWD="/"
export SEQNUM="757"
export SHLVL="1"
export SUBSYSTEM="usb"
export TYPE="255/0/0"
export UDEVD_EVENT="1"
export UDEV_LOG="3"

now for /dev/bus/usb/... devices I see events coming from udev
too, bug with different environment:
export ACTION="add"
export DEVNAME="/dev/bus/usb/002/015"
export DEVPATH="/class/usb_device/usbdev2.15"
export MAJOR="189"
export MINOR="142"
export OLDPWD
export PHYSDEVBUS="usb"
export PHYSDEVDRIVER="usb"
export PHYSDEVPATH="/devices/pci0000:00/0000:00:13.0/usb2/2-1"
export PWD="/"
export SEQNUM="758"
export SHLVL="1"
export SUBSYSTEM="usb_device"
export UDEVD_EVENT="1"
export UDEV_LOG="3"
export USB_BUS="002"
export USB_DEV="015"

ok, it is not DEVICE but DEVNAME, I can check for both. but PRODUCT is not
set, and so far I depend on that setting. I wonder why it was designed this
way?

I changed my code to
        V="`cat /sys/$DEVPATH/device/idVendor |sed -e "s/^0*//"`"
        P="`cat /sys/$DEVPATH/device/idProduct|sed -e "s/^0*//"`"
        D="`cat /sys/$DEVPATH/device/bcdDevice |sed -e "s/^0*//"`"
        PRODUCT="$V/$P/$D"
so I can get $PRODUCT in that case too. not pretty, but works for me.

Regards, Andreas



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