Public bug reported:
This issue involves systemd (the kernel-install command, the
/usr/lib/kernel/install.d/55-initrd.install script that copies
/boot/initrd.img-$KERNEL_VERSION from /boot to /boot/efi), third-party
scripts hooking into kernel-install like dracut-core's
/usr/lib/kernel/install.d/50-dracut.install, and dracut, which provides
/etc/kernel/postinst.d/dracut which is run by kernel-image maintainer
scripts like /var/lib/dpkg/info/linux-image-6.14.0-15-generic.postinst.
Steps (thanks to execsnoop):
- /etc/kernel/postinst.d/dracut generates /boot/initrd.img-$KERNEL_VERSION
- /etc/kernel/postinst.d/initramfs-tools calls update-initramfs (shipped by
either dracut or initramfs-tools)
- /usr/sbin/update-initramfs calls /etc/initramfs/post-update.d/systemd-boot,
which calls kernel-install
- /etc/kernel/postinst.d/zz-systemd-boot also calls kernel-install if neither
dracut nor initramfs-tools is installed
- kernel-install then runs:
- /usr/lib/kernel/install.d/50-dracut.install from dracut-core, which runs
dracut again, generates /boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd
- /usr/lib/kernel/install.d/55-initrd.install from systemd which copies
/boot/initrd.img-$KERNEL_VERSION to
/boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd.img-$KERNEL_VERSION
Which is how the EFI system partition ends up with duplicate initrds for every
kernel version.
ESP space is limited and hard to grow so this is problematic.
On 25.04 plucky, it is possible to have dracut-core installed, dracut
and initramfs-tools both purged, in which case dracut-core will still
generate an /boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd,
/boot/initrd.img-$KERNEL_VERSION won't be generated for newly installed
kernels, and the duplication is avoided.
** Affects: dracut (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: systemd-boot
** Description changed:
This issue involves systemd (the kernel-install command, the
/usr/lib/kernel/install.d/55-initrd.install script that copies
/boot/initrd.img-$KERNEL_VERSION from /boot to /boot/efi), third-party
scripts hooking into kernel-install like dracut-core's
/usr/lib/kernel/install.d/50-dracut.install, and dracut, which provides
/etc/kernel/postinst.d/dracut which is run by kernel-image maintainer
scripts like /var/lib/dpkg/info/linux-image-6.14.0-15-generic.postinst.
Steps (thanks to execsnoop):
- /etc/kernel/postinst.d/dracut generates /boot/initrd.img-$KERNEL_VERSION
- /etc/kernel/postinst.d/initramfs-tools calls update-initramfs (shipped by
either dracut or initramfs-tools)
- - /usr/sbin/update-initramfs calls
/etc/initramfs/post-update.d/systemd-boot, which calls install-kernel
+ - /usr/sbin/update-initramfs calls
/etc/initramfs/post-update.d/systemd-boot, which calls kernel-install
- /etc/kernel/postinst.d/zz-systemd-boot also calls kernel-install if neither
dracut nor initramfs-tools is installed
- kernel-install then runs:
- - /usr/lib/kernel/install.d/50-dracut.install from dracut-core, which runs
dracut again, generates /boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd
- - /usr/lib/kernel/install.d/55-initrd.install from systemd which copies
/boot/initrd.img-$KERNEL_VERSION to
/boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd.img-$KERNEL_VERSION
+ - /usr/lib/kernel/install.d/50-dracut.install from dracut-core, which runs
dracut again, generates /boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd
+ - /usr/lib/kernel/install.d/55-initrd.install from systemd which copies
/boot/initrd.img-$KERNEL_VERSION to
/boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd.img-$KERNEL_VERSION
Which is how the EFI system partition ends up with duplicate initrds for
every kernel version.
ESP space is limited and hard to grow so this is problematic.
On 25.04 plucky, it is possible to have dracut-core installed, dracut
and initramfs-tools both purged, in which case dracut-core will still
generate an /boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd,
/boot/initrd.img-$KERNEL_VERSION won't be generated for newly installed
kernels, and the duplication is avoided.
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https://bugs.launchpad.net/bugs/2111811
Title:
Duplicate initrds in /boot/efi partition with dracut
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