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49 lines
1.1 KiB
Nix
49 lines
1.1 KiB
Nix
with import <nix/config.nix>;
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let
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builder = builtins.toFile "nar.sh"
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''
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export PATH=${nixBinDir}:${coreutils}
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if [ $compressionType = xz ]; then
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ext=.xz
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compressor="| ${xz} -7"
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elif [ $compressionType = bzip2 ]; then
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ext=.bz2
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compressor="| ${bzip2}"
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else
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ext=
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compressor=
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fi
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echo "packing ‘$storePath’..."
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mkdir $out
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dst=$out/tmp.nar$ext
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set -o pipefail
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eval "nix-store --dump \"$storePath\" $compressor > $dst"
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hash=$(nix-hash --flat --type $hashAlgo --base32 $dst)
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echo -n $hash > $out/nar-compressed-hash
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mv $dst $out/$hash.nar$ext
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'';
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in
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{ storePath, hashAlgo, compressionType }:
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derivation {
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name = "nar";
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system = builtins.currentSystem;
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builder = shell;
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args = [ "-e" builder ];
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inherit storePath hashAlgo compressionType;
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# Don't build in a chroot because Nix's dependencies may not be there.
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__noChroot = true;
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# Remote machines may not have ${nixBinDir} or ${coreutils} in the same prefixes
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preferLocalBuild = true;
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}
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