On Tue, Jan 24, 2006 at 05:50:03PM -0600, Ken Bloom wrote: > Ralph Kutschera wrote: > > Hi List! > > > > I have a 4-in-1-CardReader and an external hard disk connected to my > > PC via USB. Ok, hotplugging would work if I could trust that same card > > slots or disk would be mapped to the same scsi devices always. However, > > depending upon when i turn on/off the external hard disk or > > inserting/ejecting a card to the reader, the devices are sometimes > > /dev/sda, /dev/sde, whatever. > > > > My question now: How can I setup hotplugging so, that disk partition 1 > > mounts to /mnt/ext1, the other partition to /mnt/ext2. Or my slot for > > SD-Cards mounts to /mnt/cards/sd. Whatever. You know. > > You'll need to learn about how to do this with udev rules. Doing it with > udev rules will take a little creativity (becasue what have to do will > depend on your hardware configuration), but not much more than is normal > when working with udev. > > http://www.reactivated.net/writing_udev_rules.html >
Let me offer a little more encouraging view of what is needed. The above URL tells you how to display information that the kernel discovers from a USB device when it is plugged in. You need to find something in these displays that is unique for each device that you intend to plug in. I like to look for a device serial number, but anything that is unique in the limited domain of the stuff that you own, will do. I have several flash memory devices, all from Sandisk. I want to keep them separate. I have several cameras. Camera serial #s and flash memory serial #s have different formats so the kernel will not confuse one for the other. Then, for each USB device, you need to decide what you would like to use as a device name in /dev. Do not try to trigger your /dev node name on which socket you use in your 4in1 USB box. Decide on a unique name for each USB gadget that you want to plug into your computer. Follow the document to have your rule create a device node using the kernel convention for device node naming. And, add to that rule an indication that you want a symlink with your unique device name. Key in these rules and restart udev. When you plug in a USB device, the rule will be triggered by the unique string you discovered in step one, and a device node and a symlink to that device node will be created. To mount the device use pmount, which is available as a debian package. This does not require root access. This is supposed to be simple. If it doesn't appear simple, it's because I didn't do a good job of writing, not because it is really complicated. -- Paul E Condon [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
