nixpkgs/pkgs/build-support/fetchsvn/builder.sh

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source $stdenv/setup
header "exporting $url (r$rev) into $out"
# Pipe the "p" character into Subversion to force it to accept the
# server's certificate. This is perfectly safe: we don't care
# whether the server is being spoofed --- only the cryptographic
# hash of the output matters.
echo 'p' | svn export -r "$rev" "$url" $out
actual=$(nix-hash $out)
if test "$actual" != "$outputHash"; then
echo "hash is $actual, expected $outputHash" >&2
exit 1
fi
stopNest