--lg-log affects pytest's rootdir

[kjeldflarup]

Using the --lg-log option affects pytest's rootdir

(labgrid-venv) kfa@kjeld-Latitude-5580:/userdata/labgridtools/remotetests/remotetest$ pytest  --capture=sys -rs --lg-log /tmp/labgrid-log --lg-env local.yaml 
================================================================================== test session starts ==================================================================================
platform linux -- Python 3.5.2, pytest-3.3.2, py-1.5.2, pluggy-0.6.0
rootdir: /, inifile:

The tests runs ok, but the pytest cache does not work
could not create cache path /.cache/v/cache/lastfailed
It seems like pytest sets rootdir to be the commom topdir of --lg-log and current working direktory

(labgrid-venv) kfa@kjeld-Latitude-5580:/userdata/labgridtools/remotetests/remotetest$ pytest  --capture=sys -rs --lg-log /userdata/labgridtools/remotetests/log --lg-env local.yaml 
================================================================================== test session starts ==================================================================================
platform linux -- Python 3.5.2, pytest-3.3.2, py-1.5.2, pluggy-0.6.0
rootdir: /userdata/labgridtools/remotetests, inifile:

[Emantor]

According to pytest-dev/pytest#1435 (mentioned in the pytest docs) this is indeed the case. I'm not sure how to fix that yet.

[Emantor]

Thinking further about this this is an issue of pytest. You'll have to set an explicit rootdir via one of the methods mentioned in the pytest docs, we can't change much about the fact that they iterate over all the pytest arguments to find a common rootdir.

[kjeldflarup]

It seems that this is the way pytest works, and pytest has its own thought about it. So lets just close this.