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by markstos 1045 days ago
This was solved from beginning of systemd with different directories for files mananged by package managers (under /lib), and files managed by you (under /etc). This is documented in `man systemd.unit`:

https://www.freedesktop.org/software/systemd/man/systemd.uni...

The same doc also describes a "drop-in" file format, where you can override just the details you want from a system file.