udev

[Jakub Piotr Cłapa]

havner napisał(a):
> On Wed, Jan 04, 2006 at 12:43:33PM +0100, Fryderyk Dziarmagowski wrote:
>> On Wed, 4 Jan 2006 11:52:15 +0100
>> havner <havner at smtp.kamp.pl> wrote:
>>
>>> Revision 1.137  2005/11/16 15:35:22  freetz
>>> - removed hotplug symlink (it can't be done this way until /sbin/hotplug
>>>   is
>>>   a default kernel hotplug handler), added cleaned up hotplug_map.rules
>>>   (instead of creating it with script at build time), rel.1
>>>
>>> So how should it be done? Cause now we end up with a booted system:
>>>
>>> $ sudo sysctl kernel.hotplug
>>> kernel.hotplug = /sbin/hotplug
>>> $ ls -l /sbin/hotplug
>>> ls: /sbin/hotplug: No such file or directory
>>>
>>> /sbin/udev_start sets this to /sbin/udevsend but rc-scripts set it back
>>> to hotplug. I dont care how it will be done (maybe remove it from
>>> rc-scripts) but for now it cant stay this way. What was wrong in this
>>> symlink? Cause i dont really get the "it can't be done this way until
>>> /sbin/hotplug is a default kernel hotplug handler". Why? This package is
>>> PLD specific and our rc-scripts set this to /sbin/hotplug so for us its
>>> default.
>> Symlink was wrong because was called after / is mounted and before udev
>> was ready to start. That was leading to propagating device nodes on
>> readonly filesystem.
> 
> Was called by what? Existance of a file means its executed? I dont get
> something here. And why this does not affect hotplug package itself
> where /sbin/hotplug exists and /dev/ is on ro filesystem for whole
> sysinit phase (no tmpfs)

Because hotplug wasn't creating any device nodes?