[Pkg-utopia-maintainers] Bug#500916: Bug#500916: hal: FDI cache does not get updated when installing .fdi files from packages

[Michael Biebl]

Martin Pitt wrote:
> Package: hal
> Version: 0.5.11-3
> Tags: patch
> User: ubuntu-devel at lists.ubuntu.com
> Usertags: origin-ubuntu intrepid ubuntu-patch
> 
> Hi!
> 
> It already occurred several times to me that people had trouble with
> FDI files which were apparently not "picked up" by hal. One particular
> case is https://bugs.launchpad.net/bugs/275825, where I finally saw
> the light: time-based comparison of .fdi files vs. the cache, as done
> in di_cache_coherency_check(), doesn't work with dpkg, which maintains
> the original file timestamps on unpack.
> 
> The quick fix for this is to remove the cache in the init script,
> which I just did in Ubuntu (we are close to release). It sacrifices
> most of the startup speed improvement unfortunately, and hal still
> won't pick up fdi changes immediately, but at least it will work after
> a reboot.
> 
> The more correct long-term solution could be to create a
> dh_install_hal_fdi which generates
> /usr/lib/hal/hald-generate-fdi-cache postinst snippets, and convert
> all packages shipping .fdi files to use it. But that's not really
> adequate for Lenny, and with DeviceKit being on the horizon, it might
> be obsolete before we even finish..
> 

Hi Martin,

I had a short discussion with lool on irc, and we had an alternative idea:
Install a dpkg trigger.
For the etch -> lenny upgrade, we would regenerate the fdi cache in hal
postinst as we can't rely on the dpkg triggers functionality yet.

Do you see any downsides of this approach?
It would we much less work than a dh_fdi and avoid the costly
regeneration on each boot.

Cheers,
Michael



-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : http://lists.alioth.debian.org/pipermail/pkg-utopia-maintainers/attachments/20081003/562a4668/attachment.pgp