On Sat, Jun 21, 2008 at 09:44:09PM +0000, Helge Rohde wrote: > Hello List, > > I need to write a backup script, and one of the required actions would be a > copy of the backup to an external firewire drive. I would like to make this > as easy as possible for the local staff, so i'd like to check whether the > drive is attached, if necessary mount it, copy over the backup and unmount > it again, so that the local staff can swap the external disks when they're > not used. > > Is there a canonical way to achieve what i want? I played with the idea of > simply checking for /dev/da0s1d's existance, but that won't disappear on > disconnect, so that would leave the is a possibility that although da0 is > in /dev, it might not be connected.
Use glabel(8) to give the device an unique label. There is no telling which device /dev/da0s1d is pointing to! After labeling you can check for /dev/<fstype>/<yourlabel>, which should be unique. Make sure to unmount the drive at the end of the backup script, or you'll get a kernel panic when staff pulls the plug on a mounted device. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
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