nixos/iso-image: Support systemd initrd (#291750) (46aad760) · Commits · nix / nixpkgs

nixos/modules/installer/cd-dvd/iso-image.nix

+60 −20

Original line number	Diff line number	Diff line
		@@ -4,6 +4,7 @@
		{
		config,
		lib,
		utils,
		pkgs,
		...
		}:
		@@ -785,7 +786,11 @@ in
		# specified on the kernel command line, created in the stage 1
		# init script.
		"/iso" = lib.mkImageMediaOverride {
		device = "/dev/root";
		device =
		if config.boot.initrd.systemd.enable then
		"/dev/disk/by-label/${config.isoImage.volumeID}"
		else
		"/dev/root";
		neededForBoot = true;
		noCheck = true;
		};
		@@ -794,7 +799,7 @@ in
		# image) to make this a live CD.
		"/nix/.ro-store" = lib.mkImageMediaOverride {
		fsType = "squashfs";
		device = "/iso/nix-store.squashfs";
		device = "${lib.optionalString config.boot.initrd.systemd.enable "/sysroot"}/iso/nix-store.squashfs";
		options = [
		"loop"
		]
		@@ -809,18 +814,11 @@ in
		};

		"/nix/store" = lib.mkImageMediaOverride {
		fsType = "overlay";
		device = "overlay";
		options = [
		"lowerdir=/nix/.ro-store"
		"upperdir=/nix/.rw-store/store"
		"workdir=/nix/.rw-store/work"
		];
		depends = [
		"/nix/.ro-store"
		"/nix/.rw-store/store"
		"/nix/.rw-store/work"
		];
		overlay = {
		lowerdir = [ "/nix/.ro-store" ];
		upperdir = "/nix/.rw-store/store";
		workdir = "/nix/.rw-store/work";
		};
		};
		};

		@@ -882,9 +880,9 @@ in
		# UUID of the USB stick. It would be nicer to write
		# `root=/dev/disk/by-label/...' here, but UNetbootin doesn't
		# recognise that.
		boot.kernelParams = [
		"root=LABEL=${config.isoImage.volumeID}"
		boot.kernelParams = lib.optionals (!config.boot.initrd.systemd.enable) [
		"boot.shell_on_fail"
		"root=LABEL=${config.isoImage.volumeID}"
		];

		fileSystems = config.lib.isoFileSystems;
		@@ -901,6 +899,44 @@ in
		"overlay"
		];

		boot.initrd.systemd = lib.mkIf config.boot.initrd.systemd.enable {
		emergencyAccess = true;

		# Most of util-linux is not included by default.
		initrdBin = [ config.boot.initrd.systemd.package.util-linux ];
		services.copytoram = {
		description = "Copy ISO contents to RAM";
		requiredBy = [ "initrd.target" ];
		before = [
		"${utils.escapeSystemdPath "/sysroot/nix/.ro-store"}.mount"
		"initrd-switch-root.target"
		];
		unitConfig = {
		RequiresMountsFor = "/sysroot/iso";
		ConditionKernelCommandLine = "copytoram";
		};
		serviceConfig = {
		Type = "oneshot";
		RemainAfterExit = true;
		};
		path = [
		pkgs.coreutils
		config.boot.initrd.systemd.package.util-linux
		];
		script = ''
		device=$(findmnt -n -o SOURCE --target /sysroot/iso)
		fsSize=$(blockdev --getsize64 "$device" \|\| stat -Lc '%s' "$device")
		mkdir -p /tmp-iso
		mount --bind --make-private /sysroot/iso /tmp-iso
		umount /sysroot/iso
		mount -t tmpfs -o size="$fsSize" tmpfs /sysroot/iso
		cp -r /tmp-iso/* /sysroot/iso/
		umount /tmp-iso
		rm -r /tmp-iso
		'';
		};
		};

		# Closures to be copied to the Nix store on the CD, namely the init
		# script and the top-level system configuration directory.
		isoImage.storeContents = [
		@@ -958,15 +994,19 @@ in
		source = "${efiDir}/EFI";
		target = "/EFI";
		}
		{
		source = (pkgs.writeTextDir "grub/loopback.cfg" "source /EFI/BOOT/grub.cfg") + "/grub";
		target = "/boot/grub";
		}
		{
		source = config.isoImage.efiSplashImage;
		target = "/EFI/BOOT/efi-background.png";
		}
		]
		++ lib.optionals (config.isoImage.makeEfiBootable && !config.boot.initrd.systemd.enable) [
		# http://www.supergrubdisk.org/wiki/Loopback.cfg
		# This feature will be removed, and thus is not supported by systemd initrd
		{
		source = (pkgs.writeTextDir "grub/loopback.cfg" "source /EFI/BOOT/grub.cfg") + "/grub";
		target = "/boot/grub";
		}
		]
		++ lib.optionals (config.boot.loader.grub.memtest86.enable && config.isoImage.makeBiosBootable) [
		{
		source = "${pkgs.memtest86plus}/memtest.bin";