Genode Packages collection https://git.sr.ht/~ehmry/genodepkgs/
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{ config, pkgs }:
let
grub' = pkgs.buildPackages.grub2_efi;
sdClosureInfo = pkgs.buildPackages.closureInfo {
rootPaths = config.genode.boot.storePaths;
};
in pkgs.stdenv.mkDerivation {
name = "ext2-fs.img.zstd";
nativeBuildInputs = with pkgs.buildPackages; [
e2fsprogs.bin
grub'
libfaketime
perl
fakeroot
zstd
];
buildCommand = ''
img=temp.raw
# Create nix/store before copying path
mkdir -p ./rootImage/boot/grub ./rootImage/nix/store
cat <<EOF > ./rootImage/boot/grub/grub.cfg
set timeout=3
set default=0
set gfxpayload=auto
${config.boot.loader.grub.extraEntries}
EOF
grub-script-check ./rootImage/boot/grub/grub.cfg
xargs -I % cp -a --reflink=auto % -t ./rootImage/nix/store/ < ${sdClosureInfo}/store-paths
(
GLOBIGNORE=".:.."
shopt -u dotglob
for f in ./files/*; do
cp -a --reflink=auto -t ./rootImage/ "$f"
done
)
# Also include a manifest of the closures in a format suitable for nix-store --load-db
cp ${sdClosureInfo}/registration ./rootImage/nix-path-registration
# Make a crude approximation of the size of the target image.
# If the script starts failing, increase the fudge factors here.
numInodes=$(find ./rootImage | wc -l)
numDataBlocks=$(du -s -c -B 4096 --apparent-size ./rootImage | tail -1 | awk '{ print int($1 * 1.10) }')
bytes=$((2 * 4096 * $numInodes + 4096 * $numDataBlocks))
echo "Creating an EXT2 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
truncate --size=$bytes $img
faketime -f "1970-01-01 00:00:01" fakeroot mkfs.ext2 -L NIXOS_GENODE -U ${config.genode.boot.storeFsUuid} -d ./rootImage $img
export EXT2FS_NO_MTAB_OK=yes
# I have ended up with corrupted images sometimes, I suspect that happens when the build machine's disk gets full during the build.
if ! fsck.ext2 -n -f $img; then
echo "--- Fsck failed for EXT2 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks) ---"
cat errorlog
return 1
fi
echo "Resizing to minimum allowed size"
resize2fs -M $img
# And a final fsck, because of the previous truncating.
fsck.ext2 -n -f $img
# Compress to store
zstd --verbose --no-progress ./$img -o $out
'';
}