this post was submitted on 25 Jun 2023
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You can use something like
strace -eopen -f -o strace.out the_program
to find all files that the program tried or succeeded to open. Then you can try to find the config file(s) in strace.out.There's also a nice version in perftools that can be given a PID. https://github.com/brendangregg/perf-tools/blob/master/opensnoop
You still don't know which location is preffered and how get they get merged. In my experience, digging into the source is the most straighforward. But my usual problem is more that the config option doesn't do at all what the documentation says it does.
Wouldn't the strace.out file be in chronological order?
Yes, though if two different files allow for the same config key - you're stuck opening both to check
And you still couldn't be sure, could be parsed the other way around for historic reasons.
Just reading the source code (if possible ofc) is imho easier than reading.
True, though I had to use strace method on closed source binaries before (zoom)
I was digging through the comments for exactly this, thanks!