[Fingerforce-devel] Bug#683863: Bug#683863: libfprint0: udev rules not applied when libfprint0 is installed

Luca Capello luca at pca.it
Fri Jan 4 12:34:40 UTC 2013

tags 683863 + patch
usertags 683863 + debian-packaging

Hi there!

On Sat, 11 Aug 2012 04:00:57 +0200, Marco d'Itri wrote:
> On Aug 05, Didier Raboud <didier at raboud.com> wrote:
>> > this can be done with the "udevadm trigger" command.  By default, this
>> > will trigger change events for all devices.  I'm not sure whether that
>> > could have undesirable consequences.  You could limit the events to just
>> > fingerprint readers with a series of
>> > 
>> >     udevadm trigger --attr-match=idVendor=xxxx --attr-match=idProduct=xxxx
>> > 
>> > Possible dh_installudev should help you with this.
>> As mentionned above, I don't think it's libfprint's job to handle this: if 
>> deemed useful, it should be done by dh_installudev (that doesn't do much else 
>> than installing the udev rules file) or by a udev dpkg trigger.
>> I'm CC'ing the udev maintainer to have his input on this. Marco: opinions?
> OP is correct: this kind of rules are not magically applied to existing 
> devices when they are installed, so your package needs to use udevadm 
> trigger in postinst to synthesize change uevents for the installed 
> hardware.

Attached an untested Git patch, which limit the events to only the
devices the package support: I will push it in one week if no one
complains, as well as ask for a wheezy unblock.

Please note that IMHO dh_installudev should be expanded to handle the
creation of the `udevadm trigger` calls, see:


Thx, bye,
Gismo / Luca

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