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