Hacker News Reader

Comment by jeremyjh | Hacker News Reader

journalctl is designed for these use cases and has options to solve those issues. The lazy part here is you not doing any research about this tool before dismissing it as "not best practice", which is exactly what the fuckups who wrote this article did.

View on HN

We dismissed using journalctl at the very start. We’ve had similar experiences with other CLI tools: the moment you start embedding them inside a program, you introduce a whole new class of problems. What if journalctl exits? What if it outputs an error? What if it hangs? On top of that, you have to manage the subprocess lifecycle yourself. It’s not as easy as it may seem.

You can also argue that sd_journal (the C API) exists for this exact reason, rather than shelling out to journalctl. These are technical trade-offs, doesn't mean we're fuckups

> You can also argue that sd_journal (the C API) exists for this exact reason, rather than shelling out to journalctl.

Quoting from https://systemd.io/JOURNAL_FILE_FORMAT/

> If you need access to the raw journal data in serialized stream form without C API our recommendation is to make use of the Journal Export Format, which you can get via journalctl -o export or via systemd-journal-gatewayd.

Certainly sounds like running journalctl, or using the gateway, is a supported option.

Does Go really not have any libraries capable of supervising an external program? If you'd considered journalctl, why didn't you mention it in the article? As many have pointed out here, it is the obvious and intended way to do this, and the path you chose was harder for reasons that seemed to surprise you but were entirely foreseeable.

JFTR, of course it has a library for it https://pkg.go.dev/os/exec

Reply on news.ycombinator.com