Re: [PATCH] rootfs: run kernel-install after update-initramfs

[Srinuvasan Arjunan <srinuvasanasv@gmail.com>]

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  Please ignore my previous message—it was accidentally sent from my end.

  Apologies for the confusion.


Many thanks,

Srinu

On Monday, April 20, 2026 at 2:53:20 PM UTC+5:30 Srinuvasan Arjunan wrote:

> On Wednesday, April 15, 2026 at 6:35:30 PM UTC+5:30 Jan Kiszka wrote:
>
> On 15.04.26 14:55, srinuvasan.a via isar-users wrote: 
> > From: srinuvasan <srinuv...@siemens.com> 
> > 
> > When efibootguard is used as the primary bootloader and 
> > systemd-boot as secondary, the WIC plugin expects /boot/EFI/Linux 
> > to contain a unified kernel image for first boot. 
> > 
>
> Err, where/how do you define "primary" and "secondary" EFI bootloaders? 
> Note that EBG is isar-cip-core, and there we definitely do not have such 
> a concept. Can you elaborate what you want to achieve? 
>
> > Run kernel-install after update-initramfs to ensure the unified 
> > kernel image is generated and placed correctly. 
> > 
> > Invoke kernel-install for UKI generation only when: 
> > - ukify binary is available 
> > - /usr/lib/kernel/install.conf exists 
> > 
> > Signed-off-by: Shivaschandra KL <shivasch...@siemens.com> 
> > Signed-off-by: srinuvasan <srinuv...@siemens.com> 
> > --- 
> > meta/classes-recipe/rootfs.bbclass | 20 +++++++++++++++++--- 
> > 1 file changed, 17 insertions(+), 3 deletions(-) 
> > 
> > diff --git a/meta/classes-recipe/rootfs.bbclass 
> b/meta/classes-recipe/rootfs.bbclass 
> > index a9233111..9024f006 100644 
> > --- a/meta/classes-recipe/rootfs.bbclass 
> > +++ b/meta/classes-recipe/rootfs.bbclass 
> > @@ -14,10 +14,20 @@ ROOTFS_DISTRO ?= "${DISTRO}" 
> > ROOTFS_USE_DRACUT ??= "" 
> > 
> > def initramfs_generator_cmdline(d): 
> > - rootfs_packages = d.getVar('ROOTFS_PACKAGES') or '' 
> > + rootfs_packages = d.getVar('ROOTFS_PACKAGES') or '' 
> > + 
> > if 'dracut' in rootfs_packages or 
> bb.utils.to_boolean(d.getVar('ROOTFS_USE_DRACUT')): 
> > - return "dracut --force --kver \"$kernel_version\"" 
> > - return "update-initramfs -u -v -k \"$kernel_version\"" 
> > + return 'dracut --force --kver "$kernel_version"' 
> > + 
> > + cmdline = 'update-initramfs -u -v -k "$kernel_version"' 
> > + 
> > + cmdline += ( 
> > + '; command -v ukify >/dev/null && [ -f /usr/lib/kernel/install.conf ] 
> && ' 
>
> Who is using ukify? No one in isar or isar-cip-core at least. Are you 
> referring to an out-of-tree wic plugin with these changes? 
>
> In-tree (Isar), we still need to enable 
> meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py to generate 
> UKIs. But that would be systemd-boot UKI-only, no EBG then. 
>
> Jan
>
>
>   Hi Jan,
>
>  In our downstream project, we use a combination of EBG and systemd-boot, 
> along with UKI (ukify) images.
>
> EBG acts as the primary bootloader to enable watchdog support during early 
> boot, while systemd-boot is used as a secondary bootloader to  select the 
> appropriate Btrfs snapshot along with its corresponding UKI image.
>
> If the system fails to be successfully “blessed” (e.g., due to issues 
> detected during validation of a newly created Btrfs snapshot), we need a 
> mechanism to fall back to a previously working snapshot and its associated 
> UKI image. This fallback selection is handled by systemd-boot.
>
> To support this flow, the WIC plugin expects /boot/EFI/Linux to contain 
> the unified kernel image required for the first boot.
> Therefore, we run kernel-install after update-initramfs to ensure that the 
> unified kernel image is properly generated and placed in the expected 
> location. 
>
> Many thanks,
> Srinu
>
> > + 'kernel-install add "$kernel_version" "/boot/${kernel##*/}" ' 
> > + '"/boot/initrd.img-$kernel_version" || :' 
> > + ) 
> > + 
> > + return cmdline 
> > 
> > ROOTFS_PACKAGES ?= "" 
> > ROOTFS_VARDEPS ?= "" 
> > @@ -627,6 +637,10 @@ python do_generate_initramfs_setscene () { 
> > } 
> > 
> > rootfs_generate_initramfs[progress] = 
> "custom:rootfs_progress.InitrdProgressHandler" 
> > +rootfs_generate_initramfs:prepend() { 
> > + export kernel 
> > +} 
> > + 
> > rootfs_generate_initramfs() { 
> > if [ -n "$(sudo find '${ROOTFSDIR}/boot' -type f -name 'vmlinu[xz]*')" 
> ]; then 
> > for kernel in ${ROOTFSDIR}/boot/vmlinu[xz]-*; do 
>
>
> -- 
> Siemens AG, Foundational Technologies 
> Linux Expert Center 
>
>

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