Re: Silly udev script [was Re: udev and devfs - The final word]

[Kay Sievers <kay.sievers@vrfy.org>]

[-- Attachment #1: Type: text/plain, Size: 1066 bytes --]

On Mon, Jan 05, 2004 at 04:36:14PM -0800, Greg KH wrote:
> On Mon, Jan 05, 2004 at 08:13:26AM -0800, Linus Torvalds wrote:
> > [ Yeah, that sounds like a singularly silly thing to do, but it's a good 
> >   example of something where there is no actual serial number, but you can 
> >   "identify" it automatically through its contents, and name it stably 
> >   according to that. ]
> 
> That was such a silly thing to do, here's a script that does it, along
> with the udev rule to add to udev.rules for it.  It names your cdrom
> Artist_Title, and creates a symlink called cdrom that points to it, just
> to be a tiny bit sane :)

Hey, this is funny.
I couldn't resist to give it a try and we need a few changes:

  - it's %2c otherwise nearly all my CD's are "good", but sure I also have bad ones :)
  - remove the node first, cause get_cddb() dies and leaves the old one there
  - remove spaces in name, cause this is our separator

/udev/
|-- The_Cure-The_Peel_Sessions
|-- cdrom -> ./The_Cure-The_Peel_Sessions
|-- hda
|-- hda1
|-- hda2
|-- hda4

thanks,
Kay

[-- Attachment #2: 01-cddb-name.diff --]
[-- Type: text/plain, Size: 1201 bytes --]

--- ../udev/extras/name_cdrom.pl	2004-01-06 04:15:31.000000000 +0100
+++ extras/name_cdrom.pl	2004-01-06 04:34:45.000000000 +0100
@@ -2,8 +2,8 @@
 
 # a horribly funny script that shows how flexible udev can really be
 # This is to be executed by udev with the following rules:
-# CALLOUT, BUS="ide", PROGRAM="name_cdrom.pl %M %m", ID="good*", NAME="%1c", SYMLINK="cdrom" 
-# CALLOUT, BUS="scsi", PROGRAM="name_cdrom.pl %M %m", ID="good*", NAME="%1c", SYMLINK="cdrom" 
+# CALLOUT, BUS="ide", PROGRAM="name_cdrom.pl %M %m", ID="good*", NAME="%2c", SYMLINK="cdrom"
+# CALLOUT, BUS="scsi", PROGRAM="name_cdrom.pl %M %m", ID="good*", NAME="%2c", SYMLINK="cdrom"
 #
 # The scsi rule catches USB cdroms and ide-scsi devices.
 #
@@ -27,9 +27,10 @@
 $minor = $ARGV[1];
 
 # create our temp device node to read the cd info from
+unlink($dev_node);
 if (system("mknod $dev_node b $major $minor")) {
        die "bad mknod failed";
-       }
+}
 
 # get it on
 my %cd=get_cddb(\%config);
@@ -41,5 +42,7 @@
 unless(defined $cd{title}) {
 	print"bad unknown cdrom\n";
 } else {
-	print "good $cd{artist}_$cd{title}\n";
+	$cd{artist} =~ s/ /_/g;
+	$cd{title} =~ s/ /_/g;
+	print "good $cd{artist}-$cd{title}\n";
 }