this post was submitted on 30 Apr 2024
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Systemd is not really an one giant monolith, it's a set of smaller tools
But all inter-dependent. C.f. the massive effort and blogs about the PITA the folks who try to keep a fork of systemd's elogind alive. All of the tools are tightly coupled, which is why they violate the Unix philosophy. It's not that they're all under one umbrella; if that were the case, GNU itself would not follow the philosophy; it's because you can't run any single component without the whole systemd system. And it's hard - and sometimes impossible - to swap out something else for anything that systemd has assimilated. Try building a system that uses systemd for init but one of the other syslog projects instead of systemd's journald. And you can use crond instead of systemd timers, but you're gonna get systemd timers whether or not you use crond, so now you just have dead code that you can't remove or disable.
Coupling, man*. It's about tight coupling, not whether there are different executables for functions or not.
^(*) gender assumption disclaimer: used in the generic, not specific, definition^
I mean systemd didn't force any distro to use their software nor force any other developer to assume systemd is present. Any software that assumes systemd is present is not the fault of systemd itself, in fact I'd argue it is a sign of its success. Argue all you want about systemd being monolithic and single point of failure, at the end of the day, software dev needs some tools, and if systemd already provides it but other software doesn't, of course they will choose systemd.
"but all interdependent"
As it fucking should be! Yes the tools should be aware of each other. Yes the tools should be integrated. Yes, the tools should not have a bunch of different ways and formats for their config files.
These are not optional components of a system. I'd rather they work together, instead of needing yet another project in between as a kludge
The problem is that all of those interdependent parts and software that are dependent on it become entrenched. There is no freedom to replace individual parts with an alternative because something else will break. That's what I call 'Modular in theory, monolithic in practice'.
It's a set of smaller tools that are developed in the same repository and all released together, all sharing some amount of code.
That basically makes it monolithic, even if there's separate binaries that the user calls.
Doesn't you description make Linux monolithic?