why the arguments are changed?

[Huarong]

When using the posargs， the path in the argument is changed with no reason. Why ?

tox.ini

[tox]
envlist=py27,py36
skipsdist=True

[testenv]
deps = pytest
commands=pytest -s tests {posargs}

[asottile]

hmmm wow yeah there appears to be something seriously wrong here.

Here's another fun one:

[tox]
skipsdist = True

[testenv]
changedir=../
commands =
    python -c 'import sys; print(sys.argv[1:])' {posargs}

$ tox -e py36 -- $PWD/tox.ini
py36 runtests: PYTHONHASHSEED='659093790'
py36 runtests: commands[0] | python -c 'import sys; print(sys.argv[1:])' x/tox.ini
['x/tox.ini']
___________________________________ summary ____________________________________
  py36: commands succeeded
  congratulations :)

it appears to be attempting to normalize paths to account for changedir -- but doing so incorrectly.

Thanks for the report! 🎉

[asottile]

There's this relevant bit from the docs indicating the adjustment is intentional, at least for relative paths:

tox rewrites each positional argument if it is a relative
path and exists on the filesystem to become a path relative to the
changedir setting.