Re: [PATCH][RFC][ModemManager] udev rules: port to hwdb where applicable

[Aleksander Morgado <aleksander lanedo com>]

Hey Tom!

> Udev recently gained a hardware database, which is an efficent replacement for
> the kind of rules shipped with modemmanager.
>
> This patch ports all the relevant udev rules to hwdb format, which should
> significantly speed up the processing of usb add events.
>
> I also fixed up some bugs in the existing udev rule files found in the process.

I wouldn't mind to see these in separate commits. Also, I wouldn't mind
to know why some .rules files got split.

> Only rudimentary testing done as I don't have the right hardware, so testing and
> comments very much appreciated!

Some general comments:

 * For what I can see, not every rules file was ported to the hwdb
format. Is it because not every rule we have can be expressed in the
hwdb format, or why?

 * Is there a good place to read about the new hwdb format?

 * How much is the improvement we're looking for?

 * systemd/udev 196 is from late 2012; if all the rules can be converted
to the new hwdb format and we decide to use it, we should probably just
require that udev version. I personally wouldn't like to maintain two
different sources of rules.

 * Which other projects are already shipping hwdb files instead of plain
udev rules?


-- 
Aleksander