Bug 922446 – sys-kernel/installkernel-16 module-rebuild ignores CONFIG_LOCALVERSION

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Nopel 2024-01-18 20:41:25 UTC]

sys-kernel/installkernel-16 with "USE=-* dracut module-rebuild"

I have "CONFIG_LOCALVERSION=-local" set in the kernel config.

After compiling the kernel, installkernel triggers a module-rebuild (zfs-kmod in my case), but it immediately fails because:
 * Determining the location of the kernel source code
 * Unable to find kernel sources at /usr/src/linux-6.6.12-gentoo-local
 * Please ensure that the KERNEL_DIR environment variable points at full Linux sources of the kernel you wish to compile against.

/usr/src/linux-6.6.12-gentoo-local indeed doesn't exist, but /usr/src/linux-6.6.12-gentoo does, and /usr/src/linux is a symlink to it.

If I do a "emerge @module-rebuild" myself, it compiles correctly.

Reproducible: Always

Steps to Reproduce:
1. Compile a kernel with CONFIG_LOCALVERSION set
2. make modules_install install
3. ... profit!

[Comment 1 Andrew Nowa Ammerlaan 2024-01-18 21:42:52 UTC]

If I understand correctly, the problem is not that the plugin ignores the LOCALVERSION, but rather that the KERNEL_VERSION that we use to set KERNEL_DIR contains the LOCALVERSION when it should not. Correct?

The direct emerge @module-rebuild would still work as expected indeed because if unset KERNEL_DIR defaults to /usr/src/linux. But in the plugin we want to install the modules for the kernel version that we are installing, which may or may not be the same as the kernel version selected by eselect kernel.

[Comment 2 Nopel 2024-01-18 22:38:10 UTC]

Right, sorry, the title is a bit misleading. You're correct, The KERNEL_VERSION you use to set the KERNEL_DIR includes the LOCALVERSION when it shouldn't.

[Comment 3 Andrew Nowa Ammerlaan 2024-01-19 10:26:31 UTC]

Hmm, after digging a bit into this, the problem is not necessarily that we do or do not take into account the LOCALVERSION. The problem is that KERNEL_VERSION does not necessarily match the name of the directory containing the kernel sources in /usr/src/. I have a fix in mind that I will release soon, just need to finish testing.

[Comment 4 Larry the Git Cow 2024-01-19 10:57:22 UTC]

The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=536a22a56713c5384b22f9056aff676638a9040d

commit 536a22a56713c5384b22f9056aff676638a9040d
Author:     Andrew Ammerlaan <[e-mail]>
AuthorDate: 2024-01-19 10:56:43 +0000
Commit:     Andrew Ammerlaan <[e-mail]>
CommitDate: 2024-01-19 10:57:10 +0000

    sys-kernel/installkernel: add 17
    
    Closes: https://bugs.gentoo.org/922446
    Signed-off-by: Andrew Ammerlaan <[e-mail]>

 sys-kernel/installkernel/Manifest                |   1 +
 sys-kernel/installkernel/installkernel-17.ebuild | 114 +++++++++++++++++++++++
 2 files changed, 115 insertions(+)

[Comment 5 Andrew Nowa Ammerlaan 2024-01-19 10:59:09 UTC]

Version 17 should fix your problem, this version is a bit smarter about finding the correct KERNEL_DIR and it will fail earlier if it can't be found. Please let me know if it works on your end now, and please reopen the bug if it does not.

[Comment 6 Nopel 2024-01-19 12:37:08 UTC]

Yes, version 17 works as expected now!

Thanks for the quick fix!