feat(systemd-repart): build image

image/default.nix

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+{
+  pkgs,
+  stdenvNoCC,
+  patosPkgs,
+  ...
+}:
+let
+  version = "0.0.1";
+  pname = "patos-image";
+in
+stdenvNoCC.mkDerivation (finalAttrs: {
+  inherit version;
+  inherit pname;
+
+  buildInputs = with pkgs; [
+    erofs-utils
+    dosfstools
+    mtools
+  ];
+
+  systemd = patosPkgs.systemd.out;
+  kernel = patosPkgs.kernel.kernel;
+  initrd = patosPkgs.initrd.out;
+  rootfs = patosPkgs.rootfs.out;
+
+  builder = ./mkimage.sh;
+})

image/mkimage.sh

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+set -ex -o pipefail
+
+mkdir -p $out/repart.d $out/boot
+pushd $out
+
+# Don't seem to work just to create a symlink to rootfs derivation?
+# ln -sf $rootfs rootfs
+mkdir rootfs
+cp -prP $rootfs/* rootfs/
+find rootfs/ -type d -exec chmod 755 {} \;
+
+$systemd/usr/bin/ukify build \
+  --os-release rootfs/etc/os-release \
+  --linux $kernel/bzImage \
+  --initrd $initrd/initrd.xz \
+  --cmdline "console=ttyS0" \
+  -o boot/patos-x64.efi
+
+cp ${systemd}/usr/lib/systemd/boot/efi/systemd-bootx64.efi boot/
+
+cat <<EOF > repart.d/10-esp.conf
+[Partition]
+Type=esp
+Format=vfat
+SizeMinBytes=96M
+SizeMaxBytes=96M
+SplitName=-
+CopyFiles=/boot/patos-x64.efi:/EFI/Linux/patos-x64.efi
+CopyFiles=/boot/systemd-bootx64.efi:/EFI/BOOT/BOOTX64.EFI
+EOF
+
+cat <<EOF > repart.d/10-root.conf
+[Partition]
+Type=root
+Format=erofs
+CopyFiles=/rootfs:/
+Minimize=best
+SplitName=root
+EOF
+
+$systemd/usr/bin/systemd-repart \
+  --no-pager \
+  --empty=create \
+  --size=1G \
+  --definitions=./repart.d \
+  --root=$out \
+  patos-$version.raw
+
+rm -rf rootfs
+rm -rf boot
+
+popd