gentoo-kernel : call custom installkernel [SOLVED]

xaviermiller · Last edited by xaviermiller on Sat Dec 30, 2023 6:42 pm; edited 9 times in total

Hi!

I am testing gentoo-kernel and it does almost what I do manually, but I would like to install and name new kernel items using my custom install script.

I see in /usr/src/linux/scripts/install.sh that I can overwrite installkernel by using my scripts in ${HOME}/bin, but I tried to create a script in /var/lib/portage/home/bin and it is not called during emerge / install of gentoo-kernel: actual installkernel-gentoo is called. Also tried in /root/bin without success...

How can I define my custom installkernel script called automatically by make install ?

EDIT: SOLVED

from this post

Zucca · Posted: Thu Dec 21, 2023 11:02 am Post subject:

I tuned in since I could probably utilize such feature, if possible. But meanwhile:

One place where you can customize the kernel name is kernel config itself. But that's only the name.
I have /etc/kernel/config.d/naming.config where I rename my kernel.

More advanced, although workaround, way would be to use /etc/kernel/postinst.d and place a script there which would then move and/or rename your kernel to your needs. Every script there will be run and given these arguments: <kernel version> <path to the new kernel>
From there it's pretty easy to construct a script to do whatever you want. I have my custom initramfs script there.

EDIT: Then there's the possibility the create your own installkernel script and ebuild which would then provide virtual of installkernel. :P
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..: Zucca :..

xaviermiller · Posted: Thu Dec 21, 2023 7:06 pm Post subject:

Thank you Zucca,

I will report on the progress in this thread, updating the OP when something is relevant.
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Kind regards,
Xavier Miller

Zucca · Posted: Thu Dec 21, 2023 7:35 pm Post subject:

Maybe the answer lies in gentoo/eclass/kernel-build.eclass at kernel-build_src_install()?
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..: Zucca :..

xaviermiller · Posted: Thu Dec 21, 2023 7:48 pm Post subject:

Finally, I will try with a post-install hook : move the versioned files from /boot to my preferred place
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Kind regards,
Xavier Miller

xaviermiller · Posted: Fri Dec 22, 2023 7:57 am Post subject:

Finally, I use the hooks and it works
- one pre-install to disable dracut (which is forced for nothing, I don't use it and don't want an intramfs) : delete the dracut hook and replace it with a dummy script
- one post-install which moves the needed files to other locations (EFI, u-boot partition, other names...) and deleted unwanted files (initrd, unneeded DTBs for my ARM boards)

I will automate the deploy of those scripts in /etc/portage/bashrc (pre-install phase of gentoo-kernel) and it will be then too annoying

_________________
Kind regards,
Xavier Miller

Zucca · Posted: Fri Dec 22, 2023 9:38 am Post subject:

xaviermiller · Posted: Fri Dec 22, 2023 10:20 am Post subject:

Hu · Administrator Joined: 06 Mar 2007 Posts: 22833

I do not see that flag as forced, and apparently Zucca does not either. What is the output of USE=-initramfs emerge --pretend --verbose sys-kernel/gentoo-kernel ; emerge --info for you?

xaviermiller · Posted: Fri Dec 22, 2023 6:32 pm Post subject:

Hi Hu,

Hu · Administrator Joined: 06 Mar 2007 Posts: 22833

I see it. This is profiles/base: Force sys-kernel/gentoo-kernel{,-bin}[initramfs], which is more recent than my last sync:

xaviermiller · Posted: Fri Dec 22, 2023 8:03 pm Post subject:

even with USE=-initramfs on gentoo-kernel, dracut is called because the hook in /etc/kernel.

I will try to see how to not set that hook (debianutils, USE="-dracut")

EDIT: USE="-dracut -initramfs" + -initramfs in package.use.force did the trick to disable and unmerge dracut

_________________
Kind regards,
Xavier Miller

Zucca · Posted: Fri Dec 22, 2023 8:53 pm Post subject: Refresh my memory

So.
I'd need to put following lines

xaviermiller · Posted: Fri Dec 22, 2023 9:06 pm Post subject: Re: Refresh my memory

Zucca · Posted: Fri Dec 22, 2023 9:09 pm Post subject: Re: Refresh my memory

TheUncleTed · n00b Joined: 26 Dec 2023 Posts: 4

xaviermiller,

Thanks for summarizing you results!

Maybe for those finding this thread later you could add a quote from lonen in https://forums.gentoo.org/viewtopic-t-1128103-start-0.html

xaviermiller · Posted: Sat Dec 30, 2023 6:43 pm Post subject:

pietinger · Posted: Sun Dec 31, 2023 11:50 am Post subject:

xaviermiller,

with all the results we have here, I think it belongs to "Documentation". If you dont like it please tell me.

Moved from Kernel & Hardware to Documentation, Tips & Tricks.
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https://wiki.gentoo.org/wiki/User:Pietinger

xaviermiller · Posted: Sun Dec 31, 2023 10:37 pm Post subject:

This is fine for me

_________________
Kind regards,
Xavier Miller

Nowa · Posted: Tue Jan 16, 2024 2:09 pm Post subject:

For completeness and future reference, adding here the link to the new installkernel wiki page: https://wiki.gentoo.org/wiki/Installkernel

Also, overriding the USE=initramfs package.use.force is no longer necessary, nowadays instead of forcing the flag we print a big warning if it is disabled.
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