Re: Utility to list /dev/nodes & serno's

[Dylan Reinhold <dylan@xxxxxxxxxxxxxxxx>]

On 08/06/2010 01:27 PM, Matthew Dillon wrote:
> :Hi people,
> :
> :is there a way to easily list all disks and their associated serno's ?
> :Something like 'blkid' utility of Linux, if you happen to know it.
> :I could happily hack something like that, if we lack it.
> :
> :
> :Cheers,
> :Stathis
>
>     There isn't, and that would be cool.  It is fairly easy to match
>     up device numbers from devfs.
>
>     You can use sysctl kern.disks output to get a list of disk devices,
>     then you can scan /dev and pick those base names out and stat them,
>     and you can scan /dev/serno and stat those babies and match up
>     the st_rdev's with the ones from /dev to getting related serial
>     numbers.
>
>     If we wanted to get more involved we could add an ioctl() to retrieve
>     the serial number (if available), but it can definitely be scripted
>     right now without that.
>
> 					-Matt
> 					Matthew Dillon
> 					<dillon@backplane.com>

I started a utility a while back going down a different path, I have now 
changed it to use the sysctl call like Matt pointed out.
This is my first attempt to contribute a utility to DragonFly (or any 
project) so I'm looking for feedback.
I have more error checking to add.

I was not sure the best place for the code, so I created a new empty 
branch [devserno] on my leaf account with the code.
http://gitweb.dragonflybsd.org/~dylan/dragonfly.git/commit/refs/heads/devserno
And a tarball
http://leaf.dragonflybsd.org/~dylan/devserno.tar.gz

The program reads the rdev's from all files in /dev/serno (excluding any 
with a .) then reads the sysctl kern.disk and prints out the matches.

This is the output from my system :
$ ./devserno
DEVICE		SERNO
/dev/ad2	05008023
/dev/ad4	JPB530HN256PBB
/dev/ad6	WD-WXEZ07T50371

Regards,
Dylan