debcrafters-packages team mailing list archive

[Gabriel de Perthuis <2111811@xxxxxxxxxxxxxxxxxx>]

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

Status in dracut package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  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.

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