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Instead of having each package call update- >>>> initramfs, >>>> use a trigger instead to have dpkg defer that call to the very >>>> end of >>>> the >>>> transaction. Many packages also failed to rebuild the initramfs >>>> when >>>> the >>>> package gets removed. Demonstrate use with initramfs-fsck-hook- >>>> ext4. >>> >>> Hi Cedric, >>> >>> thanks for bringing this up. Especially on non x86 builds the >>> update- >>> initramfs can take really long due to the emulation. >>> >>> I also played around with disabling the initrd update during image >>> building of images with a custom initramfs (where the one from the >>> rootfs is anyways not used). However the issue is, that the config >>> change needs to be made in /etc/initramfs-tools/update- >>> initramfs.conf, >>> which is shipped by initramfs-tools (no conf.d style supported). By >>> that, we would need to add this package to the default set of >>> packages >>> which I also dislike. >>> >>> What I don't understand is how the initrd trigger should help. The >>> /usr/sbin/update-initramfs internally already detects the >>> invocation >>> via dpkg and dispatches to the trigger, so manually adding this is >>> nice >>> syntax wise, but does not make a difference in performance. >>> >>> Ideally, we don't update the initrd at all during package install, >>> but >>> just generate it at do_rootfs_postprocess. >>> >> >> There is actually an issue already in Debian itself which I started >> to >> examine during Debconf but was distracted: If you install a minimal >> rootfs with kernel, that will already run the initramfs generation >> twice, although it should do it once only. That said, anything on top >> may be related to missing proper usage of triggers. > > Ok... can you provide a link to the issue? Nope, not yet reported. But you can just take a debian:bookworm-slim container and install linux-image-amd64: ... Setting up initramfs-tools-core (0.142) ... Setting up initramfs-tools (0.142) ... update-initramfs: deferring update (trigger activated) Setting up linux-image-6.1.0-13-amd64 (6.1.55-1) ... I: /vmlinuz.old is now a symlink to boot/vmlinuz-6.1.0-13-amd64 I: /initrd.img.old is now a symlink to boot/initrd.img-6.1.0-13-amd64 I: /vmlinuz is now a symlink to boot/vmlinuz-6.1.0-13-amd64 I: /initrd.img is now a symlink to boot/initrd.img-6.1.0-13-amd64 /etc/kernel/postinst.d/initramfs-tools: update-initramfs: Generating /boot/initrd.img-6.1.0-13-amd64 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8156b-2.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8156a-2.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153c-1.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153b-2.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153a-4.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153a-3.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153a-2.fw for module r8152 I: The initramfs will attempt to resume from /dev/dm-2 I: Set the RESUME variable to override this. Setting up linux-image-amd64 (6.1.55-1) ... Processing triggers for libc-bin (2.36-8) ... Processing triggers for initramfs-tools (0.142) ... update-initramfs: Generating /boot/initrd.img-6.1.0-13-amd64 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8156b-2.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8156a-2.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153c-1.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153b-2.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153a-4.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153a-3.fw for module r8152 W: Possible missing firmware /lib/firmware/rtl_nic/rtl8153a-2.fw for module r8152 I: The initramfs will attempt to resume from /dev/dm-2 I: Set the RESUME variable to override this. The kernel package enforces the initramfs generation, and then it is done again while handling the pending triggers. Jan -- Siemens AG, Technology Linux Expert Center