[Bug 1962791] Re: python3 -m venv installs pip to incorrect path VENV_ROOT/local/bin/pip

[Anders Kaseorg]

sysconfig-debian-schemes.patch uses an incorrect test for a virtual
environment:

if 'real_prefix' in sys.__dict__ or 'VIRTUAL_ENV' in os.environ:

Both sys.real_prefix and VIRTUAL_ENV are only set by virtualenv, not
venv, and then only when the virtualenv is activated by
VENV_ROOT/bin/activate, not when VENV_ROOT/bin/python is launched
directly by its path.

This patch corrects the test to

if sys.base_prefix != sys.prefix:

which works on Python ≥ 3.3.

(Also submitted to https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=1006707.)

** Patch added: "python3.10_3.10.2-5_venv.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/python3.10/+bug/1962791/+attachment/5566147/+files/python3.10_3.10.2-5_venv.debdiff

** Tags added: patch patch-forwarded-debian

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https://bugs.launchpad.net/bugs/1962791

Title:
  python3 -m venv installs pip to incorrect path VENV_ROOT/local/bin/pip

Status in python3.10 package in Ubuntu:
  Confirmed
Status in python3.10 package in Debian:
  New

Bug description:
  python3 -m venv worked correctly in Ubuntu 21.10:

  # apt update; apt install python3.10-venv
  # python3.10 -m venv /tmp/my-venv
  # . /tmp/my-venv/bin/activate
  # type pip
  pip is /tmp/my-venv/bin/pip
  # pip --version
  pip 20.3.4 from /tmp/my-venv/lib/python3.10/site-packages/pip (python 3.10)

  But in Ubuntu 22.04, it installs pip to the wrong path:

  # apt update; apt install python3.10-venv
  # python3.10 -m venv /tmp/my-venv
  # . /tmp/my-venv/bin/activate
  # type pip
  bash: type: pip: not found
  # pip --version
  bash: pip: command not found
  # echo $PATH
  /tmp/my-venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
  # ls /tmp/my-venv/bin
  Activate.ps1  activate.csh   python   python3.10
  activate      activate.fish  python3
  # ls /tmp/my-venv/local/bin
  pip  pip3  pip3.10

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