On Sat, 2010-01-30 at 13:59 -0500, Paul Dugas wrote:
> On Sat, Jan 30, 2010 at 1:27 PM, David Zeuthen <david@xxxxxxxx> wrote:
> > You should be able to use IMPORT and $tempnode
>
> And it seems the idea of getting IDs from the devices themselves is
> not off-the-wall at all. Sweet. I completely missed the $tempnode
> entry in the man page.
>
> Is there a reason I should use IMPORT{program} instead of PROGRAM like so...
>
> KERNEL=="ttyUSB*", SYSFS{serial}=="111", \
> PROGRAM="logger_port $N", \
> SYMLINK+="ttyLogger1USB%c"
>
> I ask mainly because I'm not entirely sure what "environment key format" is.
I'm not sure that the output of PROGRAM is parsed the same way it is for
IMPORT - in fact, I think it's just ignored for PROGRAM - Kay? Anyway,
the general idea is something like this
SUBSYSTEM=="tty", SUBSYSTEMS=="usb", IMPORT{program}="logger_import
$tempnode", SYMLINK+="ttyLogger$env{LOGGER_DEVICE_NUMBER}port
$env{LOGGER_PORT_NUMBER}"
where the logger_import program writes lines like this
LOGGER_PORT_NUMBER=42
LOGGER_DEVICE_NUMBER=43
on stdout which is then imported into the environment for the device
(and thus available for later rules and via libudev).
David
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