[systemd-devel] environment variable questions

[Brian Kroth]

Hi again, related to my inetd conversion example, in my .service unit I 
have something like this:

# nagios-nrpe-server at .service:
[Service]
Environment=NICENESS=0
EnvironmentFile=-/etc/default/nagios-nrpe-server
ExecStart=/usr/sbin/nrpe -i $DAEMON_OPTIONS
Nice=$NICENESS

# /etc/default/nagios-nrpe-server:
DAEMON_OPTIONS="--no-ssl"
#NICENESS=5
INETD=1


With that I get this sort of error message:
[/etc/systemd/system/nagios-nrpe-server at .service] Failed to parse nice priority, ignoring: $NICENESS

I added the leading "Environment=NICENESS=0" directive to try and make 
sure it wasn't just an empty variable kinda thing, but it didn't seem to 
help.


It's somewhat unclear from the man pages as to whether or not $VAR 
expansion is done outside of the Exec* directives, and I couldn't find a 
definitive answer online, but based on the above, I'm guessing it's not, 
correct?


Also, so long as I'm asking questions, I've got one about Condition* 
directives.  There doesn't seem to be one for Environment variable sort 
of parsing or some sort of shell command evaluation (eg: returns 0 kinda 
thing).

Something like:

# nagios-nrpe-server.socket:
[Unit]
ConditionReturnsZero=/bin/grep -q ^INETD=1$ /etc/default/nagios-nrpe-server

I got to thinking about this for the INETD directive that comes in the 
/etc/default/nagios-nrpe-server script.  It's somewhat irrelevant in 
this case since the .socket unit already needs to be active before the 
@.service pair is instantiated.

Looking at some of the other examples the system ships with like 
ssh.service vs ssh at .service/ssh.socket, they have Conflicts= directives 
against each other, but there's not really a conf file that I see that 
directs the system to use inetd-style vs daemon mode for those.

So, since there's not really a way to read that from an EnvironmentFile 
style conf file and use it in a Conditional* directive to disable one vs 
the other right now, is it just expected that people use something like 
"systemctl mask ssh.service" vs. "systemctl mask ssh.socket" to select 
between them?

Thanks,
Brian
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