global: use python3 in shebangs Python 3 is the future. We want Python scripts to be using Python 3 by default. This change updates all `#!/usr/bin/env python` shebangs to use `python3`. Does this mean all scripts use or require Python 3: no. In the test environment, the `PATH` environment variable in tests is updated to guarantee that the Python executable used to run run-tests.py is used. Since test scripts all now use `#!/usr/bin/env python3`, we had to update this code to install a `python3` symlink instead of `python`. It is possible there are some random scripts now executed with the incorrect Python interpreter in some contexts. However, I would argue that this was a pre-existing bug: we should almost always be executing new Python processes using the `sys.executable` from the originating Python script, as `python` or `python3` won't guarantee we'll use the same interpreter. Differential Revision: https://phab.mercurial-scm.org/D9273

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#!/usr/bin/env python3

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# like ls -l, but do not print date, user, or non-common mode bit, to avoid

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# using globs in tests.

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from __future__ import absolute_import, print_function

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import os

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import stat

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import sys

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def modestr(st):

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    mode = st.st_mode

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    result = ''

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    if mode & stat.S_IFDIR:

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        result += 'd'

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    else:

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        result += '-'

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    for owner in ['USR', 'GRP', 'OTH']:

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        for action in ['R', 'W', 'X']:

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            if mode & getattr(stat, 'S_I%s%s' % (action, owner)):

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                result += action.lower()

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            else:

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                result += '-'

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    return result

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def sizestr(st):

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    if st.st_mode & stat.S_IFREG:

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        return '%7d' % st.st_size

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    else:

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        # do not show size for non regular files

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        return ' ' * 7

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os.chdir((sys.argv[1:] + ['.'])[0])

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for name in sorted(os.listdir('.')):

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    st = os.stat(name)

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    print('%s %s %s' % (modestr(st), sizestr(st), name))