100 lines
2.9 KiB
Nix
100 lines
2.9 KiB
Nix
{ gptfdisk
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, e2fsprogs
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, util-linux
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, zstd
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, btrfs-progs
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, vmTools
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, runCommand
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, jq
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, kmod
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, udev
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, nix
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, lkl
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, bpiR3Stuff
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, config
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, rootfsImage
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, ... }:
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let
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imageSize = 7818182656;
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bl2Start = 34;
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bl2End = 8191;
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envStart = 8192;
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envEnd = 9215;
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factoryStart = 9216;
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factoryEnd = 13311;
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fipStart = 13312;
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fipEnd = 17407;
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rootPartStart = fipEnd + 1;
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rootPartEnd = builtins.floor (imageSize / 512) - 100;
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in
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# the vm is suuuuuper slow
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# so, do as much as possible outside of it
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# but i still need it to create subvolumes
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vmTools.runInLinuxVM (runCommand "bpi-r3-fs" {
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enableParallelBuildingByDefault = true;
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nativeBuildInputs = [
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btrfs-progs
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# dosfstools
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e2fsprogs
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util-linux # sfdisk
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config.system.build.nixos-install
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jq
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kmod
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udev
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gptfdisk
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zstd
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nix
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lkl
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];
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preVM = ''
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img=./result.img
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ls /dev/fuse /etc/mtab || (echo "Must have /dev/fuse and /etc/mtab in nix options (extra-sandbox-paths)" && exit 1)
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${vmTools.qemu}/bin/qemu-img create -f raw $img 7818182656
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truncate -s ${toString imageSize} $img
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${gptfdisk}/bin/sgdisk -o \
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--set-alignment=2 \
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-n 1:${toString bl2Start}:${toString bl2End} -c 1:bl2 -A 1:set:2 \
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-n 2:${toString envStart}:${toString envEnd} -c 2:u-boot-env \
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-n 3:${toString factoryStart}:${toString factoryEnd} -c 3:factory \
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-n 4:${toString fipStart}:${toString fipEnd} -c 4:fip \
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-n 5:${toString rootPartStart}:${toString rootPartEnd} -c 5:root -A 5:set:2 \
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$img
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dd conv=notrunc if=${bpiR3Stuff}/bl2.img of=$img seek=${toString bl2Start}
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dd conv=notrunc if=${bpiR3Stuff}/fip.bin of=$img seek=${toString fipStart}
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truncate -s ${toString ((rootPartEnd - rootPartStart + 1) * 512)} ./tmp.img
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${btrfs-progs}/bin/mkfs.btrfs \
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--label NIXOS_SD \
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--uuid "44444444-4444-4444-8888-888888888889" \
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./tmp.img
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'';
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# i give up on making this work in a nix derivation, just do the rest in a script (./image.sh)
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# (i could do more in a vm but thats too slow, i could program a custom userspace utility but thats too annoying)
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postVM = ''
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# Truncate the file at the end of the last partition
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img=./result.img
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mkdir -p $out/boot
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${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d $out/boot -g 0
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cp ${rootfsImage} $out/rootfs.ext4
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cp tmp.img $out/template.btrfs
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cp $img $out/image.img
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echo ${toString rootPartStart} > $out/metadata
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echo ${toString rootPartEnd} >> $out/metadata
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'';
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memSize = "4G";
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QEMU_OPTS = "-drive file=./tmp.img,format=raw,if=virtio,cache=unsafe,werror=report -rtc base=2000-01-01,clock=vm";
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} ''
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modprobe btrfs
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mkdir -p /mnt
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mount -t btrfs -o space_cache=v2 /dev/vda /mnt
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btrfs filesystem resize max /mnt
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btrfs subvolume create /mnt/@boot
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btrfs subvolume create /mnt/@
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btrfs subvolume create /mnt/@nix
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chattr +C /mnt/@boot
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'')
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