Description Dirk Wiesenthal 2017-01-10 17:43:09 CET

We have seen several tracebacks where it seems a simple temporary was not created.

error_file = docker.execute_with_output('mktemp').strip()
or
password_file = docker.execute_with_output('mktemp').strip()

seem to return '' from time to time. Thus, this or something similar happens:

Traceback (most recent call last):
  File "/usr/bin/univention-app", line 90, in <module>
    main()
  File "/usr/bin/univention-app", line 77, in main
    ret = args.func(args)
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/__init__.py", line 191, in call_with_namespace
    result = self.main(namespace)
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/install.py", line 67, in main
    return self.do_it(args)
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/install_base.py", line 109, in do_it
    self._do_it(app, args)
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/docker_install.py", line 65, in _do_it
    ret = super(Install, self)._do_it(app, args)
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/install.py", line 82, in _do_it
    if self._install_app(app, args):
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/docker_install.py", line 61, in _install_app
    self._setup_docker_image(app, args)
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/docker_install.py", line 83, in _setup_docker_image
    process = self._execute_container_script(app, 'setup', args)
  File "/usr/lib/pymodules/python2.7/univention/appcenter/actions/docker_base.py", line 117, in _execute_container_script
    with open(docker.path(password_file), 'w') as f:
IOError: [Errno 21] Ist ein Verzeichnis: '/var/lib/docker/overlay/a7f2d5471e998c31b7f4321aac42be92faa11df55d00510dc79f916a528cff8a/merged/'


My guess that the call fails due to heavy load. But in this case the traceback shown is not helpful. We should create the file in Python using NamedTemporaryFile. Maybe the tracebacks just go away. Maybe we get a better understanding what the real problem is.