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#1 2016-12-09 22:18:39
- graysky
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naive question: why does systemd trigger an initramfs rebuild [SOLVED]
Subject says it all. A pacman hook triggered a rebuild with 232-4 --> 232-6. Just wondering why.
Last edited by graysky (2016-12-10 00:21:27)
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#2 2016-12-09 22:36:34
- mich41
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
Doesn't initramfs contain udev, which is provided by this package?
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#3 2016-12-09 23:30:07
- jjacky
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
Because it (systemd package) contains files inside /usr/lib/initcpio, thus triggering the hook:
% grep Target /usr/share/libalpm/hooks/99-linux.hook
Target = boot/vmlinuz-linux
Target = usr/lib/initcpio/*
% pacman -Qlq systemd|grep usr/lib/initcpio
/usr/lib/initcpio/
/usr/lib/initcpio/hooks/
/usr/lib/initcpio/hooks/udev
/usr/lib/initcpio/install/
/usr/lib/initcpio/install/systemd
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#4 2016-12-09 23:31:52
- graysky
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
I understand why it is triggered, but it's unclear to me why it's necessary.
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#5 2016-12-09 23:53:17
- WorMzy
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
"Necessary" is a strong word. Initrds have worked for a long time with outdated udevs, and would continue to work without this hook. However, some noise is generated by people who get concerned that their system reports an old version of udev when they start it. e.g. https://bbs.archlinux.org/viewtopic.php?id=191243
This hook will pacify them, at the very least.
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#6 2016-12-10 00:21:16
- graysky
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
Thanks for the insight, Wormzy. Will mark as solved.
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#7 2016-12-10 00:36:30
- Trilby
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
This hook will pacify them, at the very least.
So would this one. 
"UNIX is simple and coherent..." - Dennis Ritchie, "GNU's Not UNIX" - Richard Stallman
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#8 2016-12-10 00:42:55
- WorMzy
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
This one's slightly less messy. 
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#9 2016-12-10 01:00:17
- Scimmia
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Re: naive question: why does systemd trigger an initramfs rebuild [SOLVED]
There has been at least on occasion where an old udev in the initramfs caused problems, so it makes sense to rebuild it even if you aren't using the systemd hook.
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