[systemd-devel] [PATCH] udev hwdb: Store binary database in libdir, not in /etc

[Tom Gundersen]

On Mon, Jun 17, 2013 at 7:43 PM, Michael Biebl <mbiebl at gmail.com> wrote:
> I guess we can all agree that the cache file in /etc is not really nice and that
> /etc/ld.so.cache already exists, doesn't really make that better.
> A 5+ MB blob is really annoying, especially if you use tools like etckeeper.
> Putting the cache files in /lib (or /usr/lib), isn't really great
> either, even though we have some precedence here too, like
> /lib/modules/*/ or icon and gsettings cache files.
>
> What about this compromise:
> a/ udevadm hwdb --update should be run in postinst, i.e. do not ship a
> pre-generated cache file
> b/ let udevadm hwdb --update check, if /var or /var/cache is on a
> separate partition.
> If not, store the cache file in /var/cache/udev, /etc/udev otherwise
> c/ update udev to read from both locations, /var/cache having preference
>
> The only case, where this scheme would fail, is if you backup and
> restore a system to a different partitioning scheme.

I agree with Lennart that we don't want this scheme, but rather
something predictable.

How about Colin's suggestion of putting hwdb.bin (and similar files
that cannot always be in /var/cache) in /etc/cache? Or if anyone have
the stomach for a huge fight, try to convince everyone of the
usefulness of /cache?

-t