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nixpkgs/pkgs/development/interpreters/python/hooks/conda-unpack-hook.sh

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# Setup hook to use in case a conda binary package is fetched
echo "Sourcing conda unpack hook"
condaUnpackPhase(){
echo "Executing condaUnpackPhase"
runHook preUnpack
# use lbzip2 for parallel decompression (bz2 is slow)
lbzip2 -dc -n $NIX_BUILD_CORES $src | tar --exclude='info' -x
# runHook postUnpack # Calls find...?
echo "Finished executing condaUnpackPhase"
}
if [ -z "${unpackPhase-}" ]; then
echo "Using condaUnpackPhase"
unpackPhase=condaUnpackPhase
fi