py3: update the remaining shebang lines (mostly tests) to `python3` I noticed this when running `py hghave` on a system that still has Python2- the Windows launcher attempts to honor the version of python in the shebang, but `hghave` recently gained py3 type annotations, so that resulted in a SyntaxError. I guess CI has the compat shim installed to redirect `python` to `python3`, and maybe that's why nobody noticed. These were located by grepping for `#!.+python\b`. The remaining handful of cases are tests trying to find python files, which is fine as-is. The one thing to call out here is that apparently the RPM building hasn't worked with Python3 (or we've been getting lucky). `contrib/hg-ssh` has had a python3 shebang line since late 2020, which means the EOL anchor would have caused it to not match and not be replaced with `%{pythonexe}`. OTOH, it looks like that variable was used prior to the `hg-ssh` update in order to default to python3 (as opposed to using a specific /path/to/pythonX), and maybe the update to `hg-ssh` simply broke python2 builds. I'm not going to worry about this for now, since there are also direct calls to `setup.py`, which no longer work as of this release cycle. Somebody interested in RPMs can figure out all of the issues at once.

#!/usr/bin/env python3

import sys

from mercurial import (
    commands,
    localrepo,
    ui as uimod,
)

print_ = print


def print(*args, **kwargs):
    """print() wrapper that flushes stdout buffers to avoid py3 buffer issues

    We could also just write directly to sys.stdout.buffer the way the
    ui object will, but this was easier for porting the test.
    """
    print_(*args, **kwargs)
    sys.stdout.flush()


u = uimod.ui.load()

print('% creating repo')
repo = localrepo.instance(u, b'.', create=True)

f = open('test.py', 'w')
try:
    f.write('foo\n')
finally:
    f.close

print('% add and commit')
commands.add(u, repo, b'test.py')
commands.commit(u, repo, message=b'*')
commands.status(u, repo, clean=True)


print('% change')
f = open('test.py', 'w')
try:
    f.write('bar\n')
finally:
    f.close()

# this would return clean instead of changed before the fix
commands.status(u, repo, clean=True, modified=True)