Okay, I'll rephrase the question a bit and ask it again.
Imagine that you have a service that has a configuration-dependent dependency on rsyslog. For whatever reason, journald's not an option... maybe it's simply not installed, or this service depends on rsyslog-specific behaviors that journald simply doesn't replicate. It doesn't matter why this configuration-dependent dependency exists, it simply exists and there's no workaround.
Assuming that the rsyslog service is named 'rsyslog', the service with the dependency is named 'stupid-service', the configuration file is named '/etc/stupid-service/stupid-service.conf', and the configuration option to search that config file for is 'logging = syslog', what would the systemd service file generator look like to make 'stupid-service' depend on 'rsyslog' if and only if that config file contains 'logging = syslog'?
You appear to have worked with these service file generators, which is why I'm asking. I expect you'd know what the generator to accomplish this trivial task would look like, or if it was even possible with generators.
Also:
> Yeah parsing config files with regular expressions that may or may not properly handle quoting or line continuations
Nah, this is substring matching and column-cutting. The only use of regexes ("#.*") is to remove comments. Go check out the format docs for the PostgreSQL config file. [0] It's pretty basic and straightforward.
[0] <https://www.postgresql.org/docs/17/config-setting.html#CONFI...>
Imagine that you have a service that has a configuration-dependent dependency on rsyslog. For whatever reason, journald's not an option... maybe it's simply not installed, or this service depends on rsyslog-specific behaviors that journald simply doesn't replicate. It doesn't matter why this configuration-dependent dependency exists, it simply exists and there's no workaround.
Assuming that the rsyslog service is named 'rsyslog', the service with the dependency is named 'stupid-service', the configuration file is named '/etc/stupid-service/stupid-service.conf', and the configuration option to search that config file for is 'logging = syslog', what would the systemd service file generator look like to make 'stupid-service' depend on 'rsyslog' if and only if that config file contains 'logging = syslog'?
You appear to have worked with these service file generators, which is why I'm asking. I expect you'd know what the generator to accomplish this trivial task would look like, or if it was even possible with generators.
Also:
> Yeah parsing config files with regular expressions that may or may not properly handle quoting or line continuations
Nah, this is substring matching and column-cutting. The only use of regexes ("#.*") is to remove comments. Go check out the format docs for the PostgreSQL config file. [0] It's pretty basic and straightforward.
[0] <https://www.postgresql.org/docs/17/config-setting.html#CONFI...>