add an option for rules to be run after a device is created

add an option for rules to be run after a device is created

[Stefanos Harhalakis]

Hi there,

  I'm using udev and I'd like to make a suggestion. I have these rules:

BUS="ide", KERNEL="*[!0-9]", PROGRAM="/etc/udev/scripts/get_serial %k", 
RESULT="WD-WMAEH1157379", SYMLINK="disk/root"
BUS="ide", KERNEL="*[0-9]", PROGRAM="/etc/udev/scripts/get_serial %k", 
RESULT="WD-WMAEH1157379", SYMLINK="disk/root%n"

which call a script that return the hard disk serial number using hdparm. I'm 
using this rule to find the root disk and enable its swap partition without 
knowing the device name.

  The problem is that the get_serial script is run before (for 
example) /dev/hda is created and hdparm cannot find the device (/dev is a 
tmpfs). This can be solved by running udevstart twice but I believe that 
there can be a better solution.

  I suggest you add an option that would mark rules to be examined *after* the 
device is created. This can be thought as a class of 'second pass' rules. 
Another solution is to delay the symlink rules but this may produce 
incompatibilities or other problems.

  I'm using udev 0.79, kernel 2.6.15.

Thanks in advace,

<<V13>>


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Re: add an option for rules to be run after a device is created

[Kay Sievers]

On Wed, Jan 04, 2006 at 04:20:47PM +0200, Stefanos Harhalakis wrote:
> Hi there,
> 
>   I'm using udev and I'd like to make a suggestion. I have these rules:
> 
> BUS="ide", KERNEL="*[!0-9]", PROGRAM="/etc/udev/scripts/get_serial %k", 
> RESULT="WD-WMAEH1157379", SYMLINK="disk/root"
> BUS="ide", KERNEL="*[0-9]", PROGRAM="/etc/udev/scripts/get_serial %k", 
> RESULT="WD-WMAEH1157379", SYMLINK="disk/root%n"
> 
> which call a script that return the hard disk serial number using hdparm. I'm 
> using this rule to find the root disk and enable its swap partition without 
> knowing the device name.
> 
>   The problem is that the get_serial script is run before (for 
> example) /dev/hda is created and hdparm cannot find the device (/dev is a 
> tmpfs). This can be solved by running udevstart twice but I believe that 
> there can be a better solution.

Use the persistent disk links in /dev/disk/, they will just work.

Kay


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Re: add an option for rules to be run after a device is created

[Stefanos Harhalakis]

On Wednesday 04 January 2006 16:49, Kay Sievers wrote:
> On Wed, Jan 04, 2006 at 04:20:47PM +0200, Stefanos Harhalakis wrote:
> > Hi there,
> >
> >   I'm using udev and I'd like to make a suggestion. I have these rules:
> >
> > BUS="ide", KERNEL="*[!0-9]", PROGRAM="/etc/udev/scripts/get_serial %k",
> > RESULT="WD-WMAEH1157379", SYMLINK="disk/root"
> > BUS="ide", KERNEL="*[0-9]", PROGRAM="/etc/udev/scripts/get_serial %k",
> > RESULT="WD-WMAEH1157379", SYMLINK="disk/root%n"
> >
> > which call a script that return the hard disk serial number using hdparm.
> > I'm using this rule to find the root disk and enable its swap partition
> > without knowing the device name.
> >
> >   The problem is that the get_serial script is run before (for
> > example) /dev/hda is created and hdparm cannot find the device (/dev is a
> > tmpfs). This can be solved by running udevstart twice but I believe that
> > there can be a better solution.
>
> Use the persistent disk links in /dev/disk/, they will just work.

I'm sorry about this. It seems that all I wanted was the %N ($tempnode), which 
I just found because of your reply.

Thanks a lot for your time!

<<V13>>


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