wenv | Running Python on Wine | Build Tool library

As part of my Python package, I am trying to launch wine through Python's subprocess.Popen. In a nutshell, (only) on Travis CI, although wine is in PATH, I am receiving the following error: FileNotFoundError: [Errno 2] No such file or directory: 'wine': 'wine'

What am I overlooking?

OK: The wine command is located in /opt/wine-staging/bin, which is also part of PATH. It is added in the before_install section of .travis.yml.

OK: Running wine --version in the before_install section works, showing the correct version of Wine.

OK: Checking os.environ confirms that Python sees the correct content of PATH including /opt/wine-staging/bin.

OK: Checking the contents of /opt/wine-staging/bin from my Python script with os.listdir('/opt/wine-staging/bin/') confirms that wine is present.

NOT OK: Running subprocess.Popen(['which', 'wine'], stdout = subprocess.PIPE, stderr = subprocess.PIPE).communicate() from within the Python script does not yield any output at all (but also does not fail in a meaningful way).

NOT OK: Running subprocess.Popen(['wine', '--version'], stdout = subprocess.PIPE, stderr = subprocess.PIPE).communicate() fails with FileNotFoundError: [Errno 2] No such file or directory: 'wine': 'wine'.

• Relevant section in .travis.yml
• Travis build
• Python source code, lines 194 to 214