windows: enforce the module policy to be c for test This is the same as what we do with the linux test. Differential Revision: https://phab.mercurial-scm.org/D11100

packaging: add command line flag to add extra vars to pyoxidizer This felt simpler than the previous incarnation of injecting content into the WiX build. I decided the easiest way to pass an arbitrary map into the process was some json - I may regret this, but time will tell on that. Differential Revision: https://phab.mercurial-scm.org/D11093

pyoxidizer: add hooks to inject extra python packages and install files We need this type of hook to inject our internal extension and resource files at Google. Presumably this could be useful to others, so instead of trying to carry an internal patch we've done this in a modular way that should be of value upstream. I'm extremely puzzled by the behavior of glob() on Windows, and I'll be filing at least one (probably two) bugs upstream about it. Differential Revision: https://phab.mercurial-scm.org/D11092

doc: wrap the help text for the purge extension Not sure why `black` or some other checker didn't complain about this. Differential Revision: https://phab.mercurial-scm.org/D11036

dummyssh: call python script with python We don't want windows to grab whatever python got configured to run .py file. We need the python used during the test to be used. Differential Revision: https://phab.mercurial-scm.org/D11083

dummyssh: use subprocess instead of os.call Welcome in 2020 Differential Revision: https://phab.mercurial-scm.org/D11082

run-test: rework the redirection script for python on windows This should get use something something overall simpler and clearer. Especially, we now have a `python.exe` script (even if by default Windows has `C:\Python27\python.exe` hardcoded in the register to open .py file) Differential Revision: https://phab.mercurial-scm.org/D11081

run-test: act that we requires MSYS to run the test on Windows If this ever change we can drop that constrains, however for now it seems clear to be clear about this limitation. Differential Revision: https://phab.mercurial-scm.org/D11080

sigpipe-remote: display more information about the non-py3 python If we are running the wrong things, it is useful to know which wrong thing we are running. Differential Revision: https://phab.mercurial-scm.org/D11079

sigpipe-remote: check for python version earlier in the script The should abort early, using the wrong python is a pretty bad sign. Differential Revision: https://phab.mercurial-scm.org/D11078