linux-kernel - Re: [PATCH 2/2] uevent: handle duplicate uevent

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Message-ID: <48B7FAEC.80206@kernel.org>
Date:	Fri, 29 Aug 2008 15:34:36 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Greg KH <greg@...ah.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Zeuthen <david@...ar.dk>
Subject: Re: [PATCH 2/2] uevent: handle duplicate uevent_var keys properly

Hello,

Kay Sievers wrote:
>> For OSS emulation, it didn't really matter.  For cases where it matters,
>> I think easier path to take would be let the userland emulation set up a
>> directory containing pseudo files and just override DEVPATH to it.
>> Would that work?
> 
> No, I don't think so, it's a too bad hack. the SUBSYSTEM key, the entry
> in the class/bus directory, and the target of the symlink in the device
> directory _must_ match. Everything else asks for serious trouble, by the
> inconsistency it creates.

I'm afraid trying to do that from kernel side would require more scary
hack as CUSE will need to push in random device under unsuspecting
parent / class.  Maybe we can add a variable to indicate an emulated
device or to tell udev/hal whatever to use alt root for sys hierarchy or
just consider sysfs is not available?  I think this problem can be
settled between userland programs.

Thanks.

-- 
tejun
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