more distros

pkgs/mrescue-alpine.nix

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+{
+  pkgs,
+  stdenv,
+  fetchurl,
+}:
+
+stdenv.mkDerivation rec {
+  pname = "mrescue-alpine";
+  version = "3.23.2";
+
+  src = fetchurl {
+    url = "https://dl-cdn.alpinelinux.org/alpine/v3.23/releases/x86_64/alpine-netboot-${version}-x86_64.tar.gz";
+    hash = "sha256-nFfzrPH1KI2R3OXBOluV7wB/hY63ImxWp/tyzBahpK0=";
+  };
+
+  nativeBuildInputs = with pkgs; [
+    gzip
+    cpio
+    squashfsTools
+    findutils
+    zstd
+  ];
+
+  sourceRoot = ".";
+
+  unpackPhase = ''
+    runHook preUnpack
+    mkdir alpine-boot
+    tar -xzf $src -C alpine-boot --strip-components=1
+    runHook postUnpack
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+
+    mkdir -p work/initramfs-extracted
+    cd work
+
+    gzip -dc < ../alpine-boot/initramfs-virt | \
+      cpio -idm --quiet -D initramfs-extracted
+
+    unsquashfs -f -d modloop-extracted ../alpine-boot/modloop-virt >/dev/null
+
+    mkdir -p initramfs-extracted/lib/modules
+    cp -r modloop-extracted/modules/* initramfs-extracted/lib/modules/
+
+    # Initialize apk database
+    mkdir -p initramfs-extracted/lib/apk/db
+    mkdir -p initramfs-extracted/etc/apk
+    touch initramfs-extracted/lib/apk/db/installed
+    touch initramfs-extracted/etc/apk/world
+    echo "https://dl-cdn.alpinelinux.org/alpine/latest-stable/main" > initramfs-extracted/etc/apk/repositories
+    echo "https://dl-cdn.alpinelinux.org/alpine/latest-stable/community" >> initramfs-extracted/etc/apk/repositories
+
+    cd initramfs-extracted
+    find * .[^.*] -print0 | sort -z | \
+      cpio --quiet -o -H newc -R +0:+0 --reproducible --null | \
+      zstd -19 -T8 > ../initramfs-combined.zst
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out
+    install -Dm644 ../../alpine-boot/vmlinuz-virt $out/kernel
+    install -Dm644 ../initramfs-combined.zst $out/initrd
+
+    runHook postInstall
+  '';
+}