90 lines
2.6 KiB
Nix
90 lines
2.6 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 mkIf;
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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 "enable initramfs";
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default = false;
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};
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};
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config = mkIf config.boot.initramfs.enable {
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kernel.config.BLK_DEV_INITRD = "y";
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kernel.config.INITRAMFS_SOURCE = builtins.toJSON "${config.outputs.initramfs}";
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outputs = {
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initramfs =
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let
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bb = pkgs.busybox.override {
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enableStatic = true;
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enableMinimal = true;
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enableAppletSymlinks = false;
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extraConfig = ''
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CONFIG_ASH y
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CONFIG_LS y
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CONFIG_LN y
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CONFIG_CAT y
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CONFIG_MOUNT y
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CONFIG_PRINTF y
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CONFIG_FEATURE_MOUNT_FLAGS y
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CONFIG_FEATURE_MOUNT_VERBOSE y
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CONFIG_ECHO y
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CONFIG_CHROOT y
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CONFIG_CHMOD y
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CONFIG_MKDIR y
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CONFIG_MKNOD y
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CONFIG_SH_IS_ASH y
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CONFIG_BASH_IS_NONE y
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CONFIG_FEATURE_SH_STANDALONE y
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CONFIG_FEATURE_PREFER_APPLETS y
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'';
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};
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slashinit = pkgs.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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mount -t proc none /proc
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set -- $(cat /proc/cmdline)
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for i in "$@" ; do
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case "''${i}" in
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root=*)
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rootdevice="''${i#root=}"
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;;
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esac
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done
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echo mount -t jffs2 ''${rootdevice} /target/persist
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mount -t jffs2 ''${rootdevice} /target/persist
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mount -o bind /target/persist/nix /target/nix
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sh /target/persist/activate /target
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cd /target
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mount -o bind /target /
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exec chroot . /bin/init "$@"
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'';
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refs = pkgs.writeReferencesToFile bb;
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gen_init_cpio = pkgs.pkgsBuildBuild.gen_init_cpio;
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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/mtdblock0 0600 0 0 b 31 0
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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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nod /dev/console 0600 0 0 c 5 1
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dir /bin 0755 0 0
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file /bin/busybox ${bb}/bin/busybox 0755 0 0
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slink /bin/sh /bin/busybox 0755 0 0
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file /init ${slashinit} 0755 0 0
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SPECIALS
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'';
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};
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};
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}
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