liminix/modules/kexecboot.nix

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{
config
, pkgs
, lib
, ...
}:
let
inherit (lib) mkOption mkForce types concatStringsSep;
in {
imports = [ ./ramdisk.nix ];
config = {
boot.ramdisk.enable = true;
outputs.kexecboot =
let o = config.outputs; in
pkgs.runCommand "kexecboot" {} ''
mkdir $out
cd $out
ln -s ${o.squashfs} squashfs
ln -s ${o.kernel} kernel
ln -s ${o.manifest} manifest
ln -s ${o.boot-sh} boot.sh
ln -s ${pkgs.kexec-tools}/bin/kexec ./kexec
ln -s ${o.dtb} dtb
'';
outputs.boot-sh =
let
inherit (pkgs.lib.trivial) toHexString;
inherit (config.outputs) squashfs kernel;
cmdline = concatStringsSep " " config.boot.commandLine;
in
pkgs.buildPackages.runCommand "boot.sh.sh" {
} ''
squashfsStart=${toString (100 * 1024 * 1024)}
squashfsBytes=$(stat -L -c %s ${squashfs})
append_cmd="mtdparts=phram0:''${squashfsBytes}(rootfs) phram.phram=phram0,''${squashfsStart},''${squashfsBytes} memmap=''${squashfsBytes}\$''${squashfsStart}";
cat > $out <<EOF
#!/bin/sh
test -d \$1
cd \$1
./kexec -f -d --map-file squashfs@$squashfsStart --dtb dtb --command-line '${cmdline} $append_cmd' kernel
EOF
'';
};
}