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    SubjectRe: [PATCH 2/2] uevent: handle duplicate uevent_var keys properly
    On Fri, 2008-08-29 at 10:02 +0200, Tejun Heo wrote:
    > Kay Sievers wrote:
    > > Not sure if I understand that correctly. Remember, that there is a
    > > symlink "subsystem" at each device, and udev, HAL, DeviceKit reads it.
    > > If the uevent environment key "SUBSYSTEM" does not match the symlink
    > > target, things will break horribly. So no device can be a member of
    > > class "cuse" but carry a SUBSYSTEM value of a different class.
    > >
    > > If that is how it works, I guess that must be solved differently, by
    > > hooking into the subsystem code and create "virtual devices" at the
    > > original class they fake, instead of their own "cuse" class. Possibly
    > > by making cuse a "bus", and use the cuse device as a parent for the
    > > "real" class device.
    > 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.


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