Re: debian and UDEV
Matt Zimmerman <mdz@debian.org> writes:
> On Mon, May 15, 2006 at 12:14:48PM +0200, Goswin von Brederlow wrote:
>> Matt Zimmerman <mdz@debian.org> writes:
>>
>> > I don't see it as a general issue either; if you have problems of this type,
>> > you should report them to the bug tracking system so that they can be fixed.
>> > Debian as an organization can't hope to test all of the hardware available
>> > in the market, so we rely on feedback from folks such as yourself to let us
>> > know when there is a problem.
>>
>> The most hideous problem of hotplug/udev is the following:
>>
>> You can't wait for an hotplug/udev event to be done processing. That
>> is always done asynchron without any feedback of completion.
>
> You don't need to wait for a particular event to be finished processing;
> instead you should wait for the resource you actually need to become
> available, e.g. a device node.
And how do you detect the resource not becoming available?
Say I add a fsck script that runs before the final device node is
created for any disk that gets added. That could take way longer than
even the 3 minute timeout of the udevsettle.
> It would be useful to add a simple utility for this to debianutils or
> similar so that it doesn't need to be reimplemented in so many places.
I don't see any way to make this utility without having a race
condition as it is. udev has no concept of "this rule is finished"
afaik.
MfG
Goswin
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