guix/corepkgs/fetchurl/builder.sh.in

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#! @shell@ -e
export PATH=/bin:/usr/bin
echo "downloading $url into $out"
prefetch=@storedir@/nix-prefetch-url-$md5
if test -f "$prefetch"; then
echo "using prefetched $prefetch";
mv $prefetch $out
else
@curl@ --fail --location --max-redirs 20 "$url" > "$out"
fi
actual=$(@bindir@/nix-hash --flat $out)
if test "$actual" != "$md5"; then
echo "hash is $actual, expected $md5"
exit 1
fi