How to use env variables usage in inputs.conf?

[damucka]

Hello,

I would like to use the Unix/Windows env variables in my inputs.conf, e.g. like below:

...
### App server
# 1) dev_*
[monitor:///usr/sap/$SAPSYSTEMNAME/$INSTANCE/work/dev_*]
index=mlbso
disabled=false
interval=15
sourcetype=$SAPSYSTEMNAME_abaptraces
blacklist = dev_icf
...

So, for the above I think that the monitor path definition with the $SAPSYSTEMNAME and $INSTANCE should be fine, but I also want to put it into a system-dependent sourcetype, here ($SAPSYSTEMNAME)_abaptraces and because of the concatenation I guess it will not be properly recognized.
How would I do this correct to get it into my ABC_abaptraces sourcetype?

Kind Regards,
Kamil

[jeffland]

I don't think there's a way to do what you're trying to do in splunk .conf files. I would question your use case though: a sourcetype usually shouldn't contain a variable. Most knowledge objects are tied to sourcetype, so it should be a fixed value. Why do you need a sourcetype per host, what is the goal here? You already have the field host to distinguish your hosts. The idea behind a sourcetype is that is independent of host and source.

On a side note, if you haven't encountered it yet, you might want to check out splunk-launch.conf for setting custom variables, though that's not going to help you in this case.