Hi I have read http://0pointer.net/blog/revisiting-how-we-put-together-linux-systems.html with interest and since I am using a home-grown image based installation scheme anyway, I would like to try and move that closer to the proposal from the systemd cabal. It is pretty easy to create the suggested subvolumes, but I how to proceed from that point still is a bit unclear to me:-)
How should I install kernels/initramfs though? I understood the plan to be to copy the kernel/initramfs into the EFI boot partion and to create boot loader entries linking the kernel/initramfs combo with the root file system. But where do those kernels come from? I would think the usr-subvolume is the best place for that. Did you recommend a place for the kernel/initramfs yet (E.g. <usr-subvolume>/boot) or do you expect the distributions to decide that? Do you consider a tool that will copy the kernel/initramfs from the usr-subvolumes into the EFI boot partition in scope for systemd or should the distributions handle that instead? I think the following steps are pretty generic and could be handled by a small tool shipped as part of systemd: * iterate over the usr-snapshots and get the kernel(s) and initramfs file(s) from all the snapshots boot directory (assuming you expect the distributions to put the kernels into /usr/boot). * copy those into the EFI boot partition. De-duplicate them while doing that. EFI boot partitions are FAT-based, so that will most likely require a bit of hashing as FS-based deduplication and hard-/softlinks are out:-) * create the necessary boot loader entry files according to the http://freedesktop.org/wiki/Specifications/BootLoaderSpec/ I need to give the root filesystem/subvolume with the usual kernel command line arguments, so that is not a problem. But how should the usr-subvolume be specified? Setting that in the root-subvolume makes little sense and the initramfs needs to mount /usr anyway, so I guess that will require more kernel command line arguments. Did you define those yet? I would suggest just using usrfs, usrflags and usrfstype (where the usrfs should default to rootfs and usrfstype to btrfs). Best Regards, Tobias _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
