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kernel-install: Use drop-in config to preserve layout=ostree

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When systemd is upgraded via `dnf upgrade`, the systemd-udev package
overwrites /usr/lib/kernel/install.conf with its default template,
removing the layout=ostree setting. This breaks rpm-ostree's
kernel-install integration in bootc container builds, causing:

- Initramfs to be generated in /boot/ instead of /lib/modules/<kver>/
- Old kernel directories to not be properly cleaned up
- bootc container lint failures

Per kernel-install(8), configuration in install.conf.d/ directories
is merged with install.conf. By placing the layout=ostree setting in
/usr/lib/kernel/install.conf.d/00-kernel-layout.conf, it will not be
overwritten when systemd-udev updates install.conf.

Closes: RHEL-128312
Assisted-by: OpenCode (Opus 4.5)
Signed-off-by: Joseph Marrero Corchado <jmarrero@redhat.com>
This commit is contained in:
Joseph Marrero 2026-01-10 00:29:57 -05:00
commit 3e1e61277e
1 changed files with 2 additions and 1 deletions
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3
minimal/kernel-install.yaml
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@ -4,10 +4,11 @@ postprocess:
#!/usr/bin/env bash
set -xeuo pipefail
source /usr/lib/os-release
mkdir -p /usr/lib/kernel/install.conf.d
echo -e "# kernel-install will not try to run dracut and allow rpm-ostree to\n\
# take over. Rpm-ostree will use this to know that it is responsible\n\
# to run dracut and ensure that there is only one kernel in the image\n\
layout=ostree" | tee /usr/lib/kernel/install.conf > /dev/null
layout=ostree" | tee /usr/lib/kernel/install.conf.d/00-kernel-layout.conf > /dev/null
# By default dnf keeps multiple versions of the kernel, with this
# configuration we tell dnf to treat the kernel as everything else.
# https://dnf.readthedocs.io/en/latest/conf_ref.html#main-options