[systemd-devel] [PATCH 3/5] udev: Update trackpoint rules to allow setting ibm trackpoint sensitivity

[Lennart Poettering]

On Thu, 02.04.15 12:42, Hans de Goede (hdegoede at redhat.com) wrote:

> Hi,
> 
> On 02-04-15 12:23, Lennart Poettering wrote:
> >On Thu, 02.04.15 11:48, Hans de Goede (hdegoede at redhat.com) wrote:
> >
> >>+# Same as below but also sets the TPPS/2 IBM TrackPoint driver sensitivity
> >>+KERNELS=="input*", ATTR{device/name}=="TPPS/2 IBM TrackPoint", \
> >>+  IMPORT{builtin}="hwdb 'trackpoint:name:$attr{device/name}:$attr{[dmi/id]modalias}'", \
> >>+  RUN="/bin/sh -c 'echo -n $env{TRACKPOINT_SENSITIVTY} > /sys$env{DEVPATH}/../../../sensitivity'", \
> >>+  GOTO="trackpoint_end"
> >
> >Invoking a shell for writing an attribute is certainly not OK. In
> >particular since ATTR{} can be used to write attributes.
> 
> Ok, are there any examples / docs for this ?

See rules/ in the source tree. Grep for "ATTR{" and look for the uses
with "=" (in contrast to "=="). THose are attribute assignments. (And
the ones with == are attribute comparisons...)

It's tersely documented in udev's man page.

Lennart

-- 
Lennart Poettering, Red Hat