{ stdenv, runCommand }: let bad-shebang = stdenv.mkDerivation { name = "bad-shebang"; dontUnpack = true; installPhase = '' mkdir -p $out/bin echo "#!/bin/sh" > $out/bin/test echo "echo -n hello" >> $out/bin/test chmod +x $out/bin/test ''; }; in runCommand "patch-shebangs-test" { passthru = { inherit bad-shebang; }; meta.platforms = stdenv.lib.platforms.all; } '' printf "checking whether patchShebangs works properly... ">&2 if ! grep -q '^#!/bin/sh' ${bad-shebang}/bin/test; then echo "yes" >&2 touch $out else echo "no" >&2 exit 1 fi ''