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