Issue

In #2206, we modified tox's behaviour so that skipping all environments would result in a failure rather than a success. This resolved #2195. There appears to be a bug though. When requesting a single env, if that env is skipped then an error message is produced but the exit code is 0.

❯ tox --skip-missing-interpreter=true -e py33
py33: skipped because could not find python interpreter with spec(s): py33
  py33: SKIP (0.00 seconds)
  evaluation failed :( (0.07 seconds)
❯ echo $?
0

This is not the case if requesting multiple environments. In this case, the exit code is 255.

❯ tox --skip-missing-interpreter=true -e py32,py33
py32: skipped because could not find python interpreter with spec(s): py32
py32: SKIP ⚠ in 0 seconds
py33: skipped because could not find python interpreter with spec(s): py33
  py32: SKIP (0.00 seconds)
  py33: SKIP (0.00 seconds)
  evaluation failed :( (0.07 seconds)
❯ echo $?
255

Environment

Provide at least:

• OS: Fedora 36
• pip list of the host Python where tox is installed:

❯ pip list
Package       Version
------------- -------
cachetools    5.2.0
chardet       5.1.0
colorama      0.4.6
distlib       0.3.6
filelock      3.9.0
packaging     22.0
pip           22.3.1
platformdirs  2.6.2
pluggy        1.0.0
pyproject_api 1.4.0
setuptools    65.6.3
tox           4.2.4
virtualenv    20.17.1
wheel         0.38.4

Output of running tox

Provide the output of tox -rvv:

(not relevant)

Minimal example

If possible, provide a minimal reproducer for the issue:

(see above)