nixpkgs/pkgs/tools/networking/croc/test-local-relay.nix

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{ stdenv, croc }:
stdenv.mkDerivation {
name = "croc-test-local-relay";
meta.timeout = 300;
buildCommand = ''
HOME=$(mktemp -d)
# start a local relay
${croc}/bin/croc relay --ports 11111,11112 &
# start sender in background
MSG="See you later, alligator!"
${croc}/bin/croc --relay localhost:11111 send --code correct-horse-battery-staple --text "$MSG" &
# wait for things to settle
sleep 1
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# receive, as of croc 9 --overwrite is required for noninteractive use
MSG2=$(${croc}/bin/croc --overwrite --relay localhost:11111 --yes correct-horse-battery-staple)
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# compare
[ "$MSG" = "$MSG2" ] && touch $out
'';
}