initrd.nix

{ pkgs ? import <nixpkgs> {} }: with pkgs;
let linuxPackages = callPackage /etc/nixos/thirtythree/kernel.nix {}; in
rec {
  linux = linuxPackages.kernel;
  initrd = (makeInitrd {
    contents = [
      { object = init; symlink = "/sbin/init"; }
      { object = init; symlink = "/init"; }
      { object = "${modulesClosure}/lib"; symlink = "/lib"; }
    ];
  }).overrideAttrs (o: {
    makeUInitrd = false;
  });
  modulesClosure = makeModulesClosure {
    kernel = aggregateModules [ linuxPackages.kernel linuxPackages.zfs linuxPackages.spl ];
    rootModules = ["zfs"]; 
    firmware = [];
  };
  init = writeScript "init" ''
    #!${busybox}/bin/ash -x
    ${busybox}/bin/mknod /dev/console c 5 1
    ${busybox}/bin/mknod /dev/null c 1 3
    ${busybox}/bin/mknod /dev/ttyFIQ0 c 254 0
    echo "Hello, world!"
    echo "Hello, console!" > /dev/console
    echo "Hello, tty!" > /dev/ttyFIQ0
    export PATH=${busybox}/bin:${pkgs.zfs}/bin
    mkdir -p /proc
    mount -t proc proc /proc
    mkdir -p /sys
    mount -t sysfs sys /sys
    mkdir -p /etc
    echo $'\x99\x33\x99\x33' > /etc/hostid

    modprobe zfs
    (
    cd /sys
    for dev in devices/virtual/misc/zfs block/* ; do
      ( . $dev/uevent
      type=c
      [[ $dev = *block* ]] && type=b
      mknod /dev/$DEVNAME $type $MAJOR $MINOR
      ) &
    done
    wait
    )
    mkdir -p /mnt
    zpool import -N thirtythree
    mount.zfs -o zfsutil thirtythree/nixos/root /mnt
    mount.zfs -o zfsutil thirtythree/nixos/nix /mnt/nix
    exec ash
  '';
  nspawn = writeScript "nspawn" ''
    #!${stdenv.shell}
    exec unshare -m ${nspawnReal} "$@"
  '';
  nspawnReal = writeScript "nspawn-real" ''
    #!${stdenv.shell}
    mount -t tmpfs tmpfs /tmp
    cd /tmp
    gzip -d < ${initrd}/initrd | cpio -i
    exec chroot . /sbin/init
  '';
  kexec = writeScript "kexec" ''
    #!${stdenv.shell}
    set -ex
    kexec -l ${linux}/Image --initrd ${initrd}/initrd --append "console=ttyFIQ0 panic=10 loglevel=4" --dtb ${linux}/dtbs/rockchip/rk3399-nanopi4-rev01.dtb
    sleep 5
    echo ---------------------------------------- > /dev/console
    systemctl kexec
  '';
  # storagemedia=sd rw root=PARTUUID=614e0000-0000 rootfstype=ext4 rootwait root=/dev/mmcblk0p1 rw rootfstype=ext4
  # earlycon=uart8250,mmio32,0xff1a0000 swiotlb=1 
  # uboot_logo=0x02000000@0xf5c00000 loader.timestamp=2019-03-16_17:26:35 SecureBootCheckOk=0 
}