forked from DGNum/liminix
91 lines
2.5 KiB
Nix
91 lines
2.5 KiB
Nix
{
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config
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, pkgs
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, lib
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, ...
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}:
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let
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inherit (lib) mkEnableOption mkOption mkIf types;
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inherit (pkgs) runCommand callPackage writeText;
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in
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{
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options = {
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boot.initramfs = {
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enable = mkEnableOption "initramfs";
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};
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system.build.toplevel = mkOption {
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type = types.package;
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description = ''
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pkgs.systemconfig for the configured filesystem,
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contains 'activate' and 'init' commands
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'';
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internal = true;
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};
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system.outputs = {
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initramfs = mkOption {
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type = types.package;
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internal = true;
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description = ''
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Initramfs image capable of mounting the real root
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filesystem
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'';
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};
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systemConfiguration = mkOption {
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type = types.package;
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description = ''
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pkgs.systemconfig for the configured filesystem,
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contains 'activate' and 'init' commands
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'';
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internal = true;
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};
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};
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};
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config = mkIf config.boot.initramfs.enable {
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kernel.config = {
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BLK_DEV_INITRD = "y";
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INITRAMFS_SOURCE = builtins.toJSON "${config.system.outputs.initramfs}";
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INITRAMFS_COMPRESSION_ZSTD = "y";
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};
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system.build.toplevel = config.system.outputs.systemConfiguration;
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system.outputs = {
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initramfs =
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let
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inherit (pkgs.pkgsBuildBuild) gen_init_cpio cpio writeScript;
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inherit (pkgs) busybox;
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failsafe-init = writeScript "init" ''
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#!/bin/sh
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exec >/dev/console
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echo Running in initramfs
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PATH=${busybox}/bin:$PATH
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export PATH
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mount -t proc none /proc
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mount -t sysfs none /sys
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${busybox}/bin/sh
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'';
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refs = pkgs.writeReferencesToFile busybox;
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in runCommand "initramfs.cpio" {} ''
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cat << SPECIALS | ${gen_init_cpio}/bin/gen_init_cpio /dev/stdin > out
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dir /proc 0755 0 0
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dir /dev 0755 0 0
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nod /dev/console 0600 0 0 c 5 1
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dir /target 0755 0 0
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dir /target/persist 0755 0 0
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dir /target/nix 0755 0 0
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dir /nix 0755 0 0
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dir /nix/store 0755 0 0
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dir /bin 0755 0 0
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file /bin/sh ${busybox}/bin/sh 0755 0 0
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file /init ${pkgs.preinit}/bin/preinit 0755 0 0
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file /failsafe-init ${failsafe-init} 0755 0 0
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SPECIALS
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find $(cat ${refs}) | ${cpio}/bin/cpio -H newc -o -A -v -O out
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mv out $out
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'';
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systemConfiguration =
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pkgs.systemconfig config.filesystem.contents;
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};
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};
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}
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