Klever

When one locks apt, there is the following exception:

2018-07-25 10:59:36 (install_deps.py:078) INFO> Update packages list
2018-07-25 10:59:36 (utils.py:044) INFO> Execute command "apt-get update" 
Чтение списков пакетов…
E: Не удалось получить доступ к файлу блокировки /var/lib/apt/lists/lock - open (11: Ресурс временно недоступен)
E: Невозможно заблокировать каталог /var/lib/apt/lists/
Traceback (most recent call last):
  File "/var/lib/klever/workspace/Branches-and-Tags-Processing/src/deploys/bin/deploy-local", line 27, in <module>
    deploys.local.main()
  File "/var/lib/klever/workspace/Branches-and-Tags-Processing/src/deploys/deploys/local/__init__.py", line 66, in main
    getattr(KleverTesting(args, logger), args.action)()
  File "/var/lib/klever/workspace/Branches-and-Tags-Processing/src/deploys/deploys/local/local.py", line 246, in install
    self._pre_install()
  File "/var/lib/klever/workspace/Branches-and-Tags-Processing/src/deploys/deploys/local/local.py", line 123, in _pre_install
    self._install_or_update_deps()
  File "/var/lib/klever/workspace/Branches-and-Tags-Processing/src/deploys/deploys/local/local.py", line 90, in _install_or_update_deps
    self.args.update_packages, self.args.update_python3_packages)
  File "/var/lib/klever/workspace/Branches-and-Tags-Processing/src/deploys/deploys/install_deps.py", line 79, in install_deps
    execute_cmd(logger, 'apt-get', 'update')
  File "/var/lib/klever/workspace/Branches-and-Tags-Processing/src/deploys/deploys/utils.py", line 65, in execute_cmd
    subprocess.check_call(args, **kwargs)
  File "/usr/lib/python3.5/subprocess.py", line 271, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '('apt-get', 'update')' returned non-zero exit status 100

We can silently wait for apt unlocking.