Dan Nicholson wrote:
On 3/7/06, Dan McGhee <[EMAIL PROTECTED]> wrote:
My original set up were lines in /etc/udev/rules.d. Here are
the relevant parts:
/etc/udev/rules.d/24-dvd.rules
KERNEL="hdc", SYMLINK="dvd"
I'm not the expert here, but I think you need SYMLINK+=dvd. Then,
udev will retain this in it's memory until later when it finds the
BUS=="ide" rule that tells it how to actually create the device nodes.
I'm pretty sure if you read the how-to-write-udev-rules.html doc that
came with udev, it says that if you want multiple symlinks, you need
to use +=.
Dan, I'm not trying to refute what you've said here, I'm trying to
understand this system. Maybe this is just one of those things that
must be left "not understood completely" unless one takes a course
UDEV-631. :-)
If I may be so bold as to quote from "Writing UDEV rules:
Take the rule:
KERNEL="hdc", SYMLINK="dvd"
When udev finds this rule, it will take a mental note of it. Upon
finding another rule matching the same device which also includes a
/NAME/ parameter, udev will create the node as specified by the /NAME/
parameter, plus symbolic links as specified by the /SYMLINK/
parameters of both rules.
To put it into practical terms, when udev is naming nodes for my /hdc/
device, it will use the default rules for block devices as usual, with
the addition of my personal symlink "dvd".
Similarly to normal rules, rules of this type will only take effect if
udev is able to find them /before/ it finds a rule specifying a /NAME/
parameter.
And from the man page:
= Assign a value to a key. Keys that represent a list, are reset
and only this single value is assigned.
+= Add the value to a key that holds a list of entries
So it looks like the article may be in error here.
BUS=="ide", KERNEL=="hd[a-z]", PROGRAM="/bin/cat /proc/ide/%k/media",
RESULT=="cdrom", NAME="%k", GROUP:="optical", SYMLINK+="cdrom%e"
BUS=="ide", KERNEL=="hd[a-z]", PROGRAM="/bin/grep '^PLEXTOR' /proc/ide/%k/model"
, SYMLINK+="cdrw"
BUS=="ide", KERNEL=="hd[a-z]", PROGRAM="/bin/grep '^PIONEER' /proc/ide/%k/model"
, SYMLINK+="dvd"
BUS=="ide", KERNEL=="hd[a-z]", PROGRAM="/bin/grep '^PIONEER' /proc/ide/%k/model"
, SYMLINK+="dvdrw"
#KERNEL="hdd", SYMLINK+="dvd"
From your setup, it looks like += circumvents the NAME key thing
mentioned in the article because three of the four SYMLINKS come
afterwards. In my case, I used SYMLINK="cdrom dvd" But then I have
only one drive too.
But the weird thing in my case, considering the article, is that
/dev/dvd was created and /dev/cdrom was not. 25-lfs.rules and the
directions (I think it's in MPlayer in BLFs) for setting up the dvd
rules, should work according to the article. But they didn't for me.
I'm not going to lose sleep over this. However, I find it quite
interesting. It's got to have been something I did, since, as I said in
my original post, the same combination of UDEV rules works in my other
LFS system. The bottom line is I got what I wanted.
Thanks for the response.
Dan
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