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source $stdenv/setup
tagtext=""
tagflags=""
if test -n "$tag"; then
tagtext="(tag $tag) "
tagflags="--tag=$tag"
fi
header "getting $url ${tagtext}into $out"
darcs get --no-pristine-tree $tagflags "$url" "$out"
# remove metadata, because it can change
rm -rf "$out/_darcs"
actual=$(nix-hash $out)
if test "$actual" != "$outputHash"; then
echo "hash is $actual, expected $outputHash" >&2
exit 1
fi
stopNest
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