lix/corepkgs/nar.nix

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with import <nix/config.nix>;
let
builder = builtins.toFile "nar.sh"
''
export PATH=${nixBinDir}:${coreutils}
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if [ $compressionType = "xz" ]; then
ext=xz
compressor=${xz} -9
else
ext=bz2
compressor=${bzip2}
fi
echo "packing $storePath..."
mkdir $out
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dst=$out/tmp.nar.$ext
set -o pipefail
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nix-store --dump "$storePath" | $compressor -9 > $dst
hash=$(nix-hash --flat --type $hashAlgo --base32 $dst)
echo -n $hash > $out/nar-compressed-hash
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mv $dst $out/$hash.nar.$ext
'';
in
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{ storePath, hashAlgo, compressionType }:
derivation {
name = "nar";
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system = builtins.currentSystem;
builder = shell;
args = [ "-e" builder ];
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inherit storePath hashAlgo compressionType;
# Don't build in a chroot because Nix's dependencies may not be there.
__noChroot = true;
}