contrib: add modern `setuptools` and `setuptools_scm` to the packaging venv With `py -3.9 contrib/packaging/packaging.py wix --pyoxidizer-target x86_64-pc-windows-msvc`, there is an immediate failure after building the venv (3.9.13 has `setuptools` 58.1.0): ModuleNotFoundError: No module named 'setuptools.command.build' With that fixed, the same command then fails immediately with this error: Couldn't import setuptools_scm (direct call of setup.py?) Unfortunately, referencing `setuptools` in the requirements file needs `--allow-unsafe` to avoid a warning about not pinning `setuptools`. However, the same warning happens if `setuptools` is pinned to a specific revision, so I have no idea what it is complaining about. It's a separate venv that is only used for packaging, so we can fix it if it becomes a problem in the future. Interestingly, the Inno installer build doesn't fail immediately, and I can see it installing `setuptools` and `setuptools_scm` in the wall of text it emits. Eventually it does fail with the same errors without this change.

# memory.py - track memory usage
#
# Copyright 2009 Olivia Mackall <olivia@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

'''helper extension to measure memory usage

Reads current and peak memory usage from ``/proc/self/status`` and
prints it to ``stderr`` on exit.
'''


def memusage(ui):
    """Report memory usage of the current process."""
    result = {'peak': 0, 'rss': 0}
    with open('/proc/self/status') as status:
        # This will only work on systems with a /proc file system
        # (like Linux).
        for line in status:
            parts = line.split()
            key = parts[0][2:-1].lower()
            if key in result:
                result[key] = int(parts[1])
    ui.write_err(
        ", ".join(
            ["%s: %.1f MiB" % (k, v / 1024.0) for k, v in result.iteritems()]
        )
        + "\n"
    )


def extsetup(ui):
    ui.atexit(memusage, ui)