On Wed, Mar 11, 2009 at 08:10:46AM -0700, Peter Steele wrote: > >My question to you would be: What exactly do you mean by > >"automatically detect"? The drive *is* automatically detected. > >Should it be mounted afterwards? > > Yeah, I guess my wording was a little vague. I know that the system > automatically detects when a USB drive is inserted, and creates the > appropriate entries under /dev. I want to follow this up with having > the drive automatically mounted, and I'll then examine the USB drive > for specific files I expect to be present, and possible run something > that's installed on the disk, then unmount the disk. We want to use > this approach to deploy our software on large clusters of machines > that may not have an IP identity.
The easiest way (I think) is to use devd, in combination with a USB
drive that has a unique label.
Say you have a USB drive formatted with a UFS filesystem. You use
'tunefs -L' to give this drive a unique label,
e.g. 'FOO'. Then you can put the following in /etc/devd.conf
notify 1000 {
match "system" "DEVFS";
match "subsystem" "CDEV";
match "cdev" "/dev/ufs/FOO";
action "sh /usr/local/sbin/autorun /dev/ufs/FOO &";
};
Where the script /usr/local/sbin/autorun would contain the required actions
(mount, check, run, umount, beep).
The reason for using a labeled device is that you might not want to run
the script on any old USB drive! If you want to use a FAT formatted
drive you should use /dev/msdosfs/FOO for the path.
Last week I submitted a patch to get this system and subsystem
documented in the manual page of devd.conf. It should be in CURRENT now,
and will be MFC'd to STABLE in a week or so.
Roland
--
R.F.Smith http://www.xs4all.nl/~rsmith/
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