def fresh_dir(dir_path):
rm_rf(dir_path)
assert not exists(dir_path)
os.mkdir(dir_path)
def pkgbuild_script(name, info, src, dst='postinstall'):
fresh_dir(SCRIPTS_DIR)
fresh_dir(PACKAGE_ROOT)
move_script(join(OSX_DIR, src), join(SCRIPTS_DIR, dst), info)
pkgbuild(name)
rm_rf(SCRIPTS_DIR)