Mongorestore fails to restore data when called from within a docker container

[FabianElsmer]

• py.test dockerdb version:
  0.5.1
• Mongodb version
  3.5
• Python version:
  2.7
• Operating System:
  Fedora 29

Description

Dockerdb generally works even from within another docker container, as long as the docker.sock is mounted. It makes local testing a breeze, since the docker-compose / Dockerfile already encapsulates the project setup, independent of the host environment.

The restore option fails to set the data on the database when a pytest is executed from within a docker container. The dump path should exists, but the exec_run returns the following error:

('Exit code', 1, "2020-03-10T02:19:26.710+0000 Failed: mongorestore target 
'/tmp/tmpc_pieAtmp_1583806764_mongo_0/dump' invalid: stat 
/tmp/tmpc_pieAtmp_1583806764_mongo_0/dump: no such file or directory\n")

Executing the same test outside the docker container successfully restores the data. The problem seems to be related to the way the service shares data, using a shared volume. The problem can be locally reproduced but fixed by mounting /tmp in the main container.

What I Did

conftest.py

BASE_PATH = os.path.dirname(__file__)
DUMP_PATH = os.path.join(BASE_PATH, 'dump')
mongo = dockerdb.mongo_pytest.mongo_fixture(versions=["3.5"], restore=DUMP_PATH)

docker exec docker_container pytest