---- On Thu, 28 Aug 2025 21:14:34 +0400 Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx> wrote --- > Which part of the running system check the cpio signature. You mean who checks cpio signature at boot? Ideally, bootloader should do this. For example, as well as I understand, UKI's EFI stub checks initramfs signature. (See https://github.com/systemd/systemd/blob/main/docs/ROOTFS_DISCOVERY.md ). It seems that this document (ROOTFS_DISCOVERY) covers zillions of use cases, so I hope you will find something for you. I also added to CC Poettering and systemd, hopefully they have some ideas. > Why users need to extract the whole cpio to tmpfs just for some data > part in the erofs? even some data is never used? Initramfs should be small. Time for extracting should not matter. If initramfs is too big, and time becomes issue, you are doing it wrong. Point of initramfs is to be transition stage and then get to real root. Initramfs should not be feature-rich and should not be big. > Personally I just don't understand why cpio stands out considering it > even the format itself doesn't support xattrs and more. As I said above, initramfs should not be feature-rich. (But xattrs can be added to it, if needed.) -- Askar Safin https://types.pl/@safinaskar
