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if test -z "$out"; then
stdenv="$STDENV"
url="$URL"
id="$ID"
outputHashAlgo="$OUTPUTHASHALGO"
outputHash="$OUTPUTHASH"
chmod=$CHMOD
curl=$CURL
fi
source $stdenv/setup
if test -z "$out"; then
out="$OUT"
fi
header "downloading $out from $url"
$curl --fail --location --max-redirs 20 "$url" > "$out"
if test "$NIX_OUTPUT_CHECKED" != "1"; then
if test "$outputHashAlgo" != "md5"; then
echo "hashes other than md5 are unsupported in Nix <= 0.7, upgrade to Nix 0.8"
exit 1
fi
actual=$(md5sum -b "$out" | cut -c1-32)
if test "$actual" != "$id"; then
echo "hash is $actual, expected $id"
exit 1
fi
fi
$chmod a-x $out
stopNest
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