[collectd] exec-plugin

[Peter Holik]

Hi!

I collect temperatures from a 1-wire DS18S20 chip connected to /dev/ttyS0 via
digitemp used by exec-plugin.

<Plugin exec>
Exec "nobody:dialout" "/usr/bin/digitemp_DS9097" "-n0" "-d10" "-a" "-q"
"-c/etc/digitemprc" "-oPUTVAL lindev/temp/temperature-%s interval=10 %N:%.2C"
</Plugin>

#> ls -la /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 2008-02-15 10:48 /dev/ttyS0

digitemp refuses to run as root so i let it run as nobody with group dialout

I think collect handles groupid's wrong.

Whith this patch (changing egid <-> gid) everything works.

cu Peter
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