1482593 - Support launching mach via py.exe on Windows

Status: RESOLVED INVALID

(Firefox Build System :: Mach Core, enhancement)

Description

[ExE Boss]

Bug 957721 changed the shebang line from `#!/usr/bin/env python` to `#!/usr/bin/env python2.7` and then to:
```python
#!/bin/sh
'''which' python2.7 > /dev/null && exec python2.7 "$0" "$@" || exec python "$0" "$@"
'''
```

The last one broke compatibility with `py.exe` (https://www.python.org/dev/peps/pep-0394/) making it impossible to run mach directly on Windows.

If the shebang line is instead set to `#!/usr/bin/env python2.7` or `#!/usr/bin/env python2`, then it works (mostly) fine with `py.exe`, but the code page has to be changed from 65001 (UTF‑8) to 1252 (Windows-1252), as Python 2 doesn’t know that Windows maps cp65001 to UTF‑8, but Python 3 does.

There’s also the `win_unicode_console` Python package¹, which adds proper Unicode support to Python on Windows.

¹ https://pypi.org/project/win_unicode_console/

---

Relevant Python issues:
- https://bugs.python.org/issue13216
- https://bugs.python.org/issue1602 (esp. https://bugs.python.org/issue1602#msg145898)

Comment 1

[ExE Boss]

Attachment: Bug 1482593 - Support launching mach via py.exe on Windows

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The bug assignee is inactive on Bugzilla, so the assignee is being reset.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The following patch is waiting for review from reviewers who are inactive or resigned from the review:

ID	Title	Author	Reviewer Status
D3141	Bug 1482593 - Support launching mach via py.exe on Windows	e7358d9c	glandium: Resigned from review
			mshal: Resigned from review
			gps: Resigned from review

:e7358d9c, could you please find another reviewer or abandon the patch if it is no longer relevant?

For more information, please visit auto_nag documentation.

Comment 4

[[:sergesanspaille]]

We no longer support building with python2, and use a standard shebang as documented in https://docs.python.org/3/using/windows.html#shebang-lines so I don't think this apply anymore.