def add(self, repo_url=None, ppa=None):

        if repo_url is not None:
            repo_file_path = ("/etc/apt/sources.list.d/"
                              + EEVariables().ee_repo_file)
            try:
                if not os.path.isfile(repo_file_path):
                    with open(repo_file_path,
                              encoding='utf-8', mode='a') as repofile:
                        repofile.write(repo_url)
                        repofile.write('\n')
                        repofile.close()
                elif repo_url not in open(repo_file_path,
                                          encoding='utf-8').read():
                    with open(repo_file_path,
                              encoding='utf-8', mode='a') as repofile:
                        repofile.write(repo_url)
                        repofile.write('\n')
                        repofile.close()
                return True
            except IOError as e:
                Log.debug(self, "{0}".format(e))
                Log.error(self, "File I/O error.")
            except Exception as e:
                Log.debug(self, "{0}".format(e))
                Log.error(self, "Unable to add repo")
        if ppa is not None:
            EEShellExec.cmd_exec(self, "add-apt-repository -y '{ppa_name}'"
                                 .format(ppa_name=ppa))
This function used to add apt repositories and or ppa's
dataset/ETHPy150Open EasyEngine/easyengine/ee/core/apt_repo.py/EERepo.add