nix-super/corepkgs/unpack-channel.nix

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with import <nix/config.nix>;
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let
builder = builtins.toFile "unpack-channel.sh"
''
mkdir $out
cd $out
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xzpat="\.xz\$"
gzpat="\.gz\$"
if [[ "$src" =~ $xzpat ]]; then
${xz} -d < $src | ${tar} xf - ${tarFlags}
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elif [[ "$src" =~ $gzpat ]]; then
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${gzip} -d < $src | ${tar} xf - ${tarFlags}
else
${bzip2} -d < $src | ${tar} xf - ${tarFlags}
fi
if [ * != $channelName ]; then
mv * $out/$channelName
fi
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'';
in
{ name, channelName, src }:
derivation {
system = builtins.currentSystem;
builder = shell;
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args = [ "-e" builder ];
inherit name channelName src;
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PATH = "${nixBinDir}:${coreutils}";
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# No point in doing this remotely.
preferLocalBuild = true;
inherit chrootDeps;
}