this post was submitted on 05 Sep 2024
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Porting systemd to musl libc-powered Linux (catfox.life)
submitted 2 months ago by pnutzh4x0r@lemmy.ndlug.org to c/linux@lemmy.ml
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I have completed an initial new port of systemd to musl. This patch set does not share much in common with the existing OpenEmbedded patchset. I wanted to make a fully updated patch series targeting more current releases of systemd and musl, taking advantage of the latest features and updates in both. I also took a focus on writing patches that could be sent for consideration of inclusion upstream.

The final result is a system that appears to be surprisingly reliable considering the newness of the port, and very fast to boot.

...

And that is how I became the first person alive to see systemd passing its entire test suite on a big-endian 64-bit PowerPC musl libc system.

...

While the system works really well, and boots in 1/3rd the time of OpenRC on the same system, it isn’t ready for prime time just yet.

...

There aren’t any service unit files written or packaged yet, other than OpenSSH and utmps. We are working with our sponsor on an effort to add -systemd split packages to any of the packages with -openrc splits. We should be able to rely on upstream units where present, and lean on Gentoo and Fedora’s systemd experts to have good base files to reference when needed. I’ve already landed support for this in abuild.

This work is part of Adélie Linux

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[–] khorovodoved@lemm.ee 3 points 2 months ago (14 children)

While I do appreciate the effort, I cannot understand, who in their right mind would use musl and systemd together. For what purpose? If a person was already willing to manage a musl system, why wouldn't he also prefer sysVinit or runit or whatever?

[–] intelisense@lemm.ee 8 points 2 months ago (3 children)

My understanding is that it boots faster. That's a nice thing to have on a container that spins up on demand.

[–] khorovodoved@lemm.ee 5 points 2 months ago* (last edited 2 months ago) (1 children)

It boots faster than openRC (which is painfully slow). But runit is a lot faster than systemd, and there are init systems even faster than runit. And they all already work with musl. There is even dinit system specifically designed for containers.

[–] LeFantome@programming.dev 1 points 2 months ago (1 children)

What is the name of the dinit system designed for containers?

[–] khorovodoved@lemm.ee 3 points 2 months ago

"dinit"

[–] PureTryOut@lemmy.kde.social 4 points 2 months ago

In general (there are exceptions) containers do not use service managers at all. They start 1 command and that's it.

[–] corsicanguppy@lemmy.ca 1 points 2 months ago

My understanding is that it boots faster.

I tested this with EL6 and EL7. There was no discernible difference. It was all theories and brochureware.

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