Drop Python 2.7 and 3.6 support (#36)

Dockerfile

@@ -20,7 +20,6 @@ RUN apt-get update -y && \
     openssh-client \
     openssh-server \
     openssl \
-    python2.7-dev \
     python3.8-dev \
     python3.8-distutils \
     python3.8-venv \
@@ -41,8 +40,6 @@ COPY files/deadsnakes.list /etc/apt/sources.list.d/deadsnakes.list
 # This is done separately to avoid conflicts with official Ubuntu packages.
 RUN apt-get update -y && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
-    python3.6-dev \
-    python3.6-venv \
     python3.7-dev \
     python3.7-distutils \
     python3.7-venv \
@@ -60,8 +57,7 @@ RUN apt-get update -y && \
     rm -rf /var/lib/apt/lists/*
 
 RUN rm /etc/apt/apt.conf.d/docker-clean && \
-    ln -s python2.7 /usr/bin/python2 && \
-    ln -s python3   /usr/bin/python && \
+    ln -s python3 /usr/bin/python && \
     locale-gen en_US.UTF-8
 
 # Install PowerShell using a binary archive.
@@ -94,6 +90,5 @@ RUN ln -s /usr/bin/python3.12 /usr/share/container-setup/python
 RUN /usr/share/container-setup/python -B /usr/share/container-setup/setup.py
 
 # Make sure the pip entry points in /usr/bin are correct.
-RUN rm -f /usr/bin/pip2 && cp -av /usr/local/bin/pip2 /usr/bin/pip2 && /usr/bin/pip2 -V && \
-    rm -f /usr/bin/pip3 && cp -av /usr/local/bin/pip3 /usr/bin/pip3 && /usr/bin/pip3 -V && \
+RUN rm -f /usr/bin/pip3 && cp -av /usr/local/bin/pip3 /usr/bin/pip3 && /usr/bin/pip3 -V && \
     rm -f /usr/bin/pip  && cp -av /usr/local/bin/pip  /usr/bin/pip  && /usr/bin/pip  -V

files/installer.py

@@ -59,17 +59,7 @@ class Pip:
         wheel='0.37.1',
     )
 
-    _PACKAGES = {
-        '2.7': dict(
-            pip='20.3.4',  # 21.0 requires Python 3.6+
-            setuptools='44.1.1',  # 45.0.0 requires Python 3.5+
-            wheel=None,
-        ),
-        '3.6': dict(
-            pip='21.3.1',  # 22.0 requires Python 3.7+
-            setuptools='59.6.0',  # 59.7.0 requires Python 3.7+
-            wheel=None,
-        ),
+    _PACKAGES: dict[str, dict[str, str]] = {
     }
 
     def __init__(self, python: Python) -> None:

files/quiet_pip.py

@@ -1,33 +1,23 @@
 """Custom entry-point for pip that filters out unwanted logging and warnings."""
-from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
+from __future__ import annotations
 
 import logging
 import os
 import re
 import runpy
 import sys
-import warnings
 
 BUILTIN_FILTERER_FILTER = logging.Filterer.filter
 
 LOGGING_MESSAGE_FILTER = re.compile("^("
                                     ".*Running pip install with root privileges is generally not a good idea.*|"  # custom Fedora patch [1]
                                     ".*Running pip as the 'root' user can result in broken permissions .*|"  # pip 21.1
-                                    "DEPRECATION: Python 2.7 will reach the end of its life .*|"  # pip 19.2.3
                                     "Ignoring .*: markers .* don't match your environment|"
                                     "Looking in indexes: .*|"  # pypi-test-container
                                     "Requirement already satisfied.*"
                                     ")$")
 
-# [1] https://src.fedoraproject.org/rpms/python-pip/blob/master/f/emit-a-warning-when-running-with-root-privileges.patch
-
-WARNING_MESSAGE_FILTERS = (
-    # DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained.
-    # pip 21.0 will drop support for Python 2.7 in January 2021.
-    # More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
-    'DEPRECATION: Python 2.7 reached the end of its life ',
-)
+# [1] https://src.fedoraproject.org/rpms/python-pip/blob/f34/f/emit-a-warning-when-running-with-root-privileges.patch
 
 
 def custom_filterer_filter(self, record):
@@ -44,20 +34,19 @@ def main():
     # It also avoids problems with loss of color output and mixing up the order of stdout/stderr messages.
     logging.Filterer.filter = custom_filterer_filter
 
-    for message_filter in WARNING_MESSAGE_FILTERS:
-        # Setting filterwarnings in code is necessary because of the following:
-        #   Python 2.7 cannot use the -W option to match warning text after a colon. This makes it impossible to match specific warning messages.
-        warnings.filterwarnings('ignore', message_filter)
-
     get_pip = os.environ.get('GET_PIP')
 
-    if get_pip:
-        directory, filename = os.path.split(get_pip)
-        module = os.path.splitext(filename)[0]
-        sys.path.insert(0, directory)
-        runpy.run_module(module, run_name='__main__', alter_sys=True)
-    else:
-        runpy.run_module('pip.__main__', run_name='__main__', alter_sys=True)
+    try:
+        if get_pip:
+            directory, filename = os.path.split(get_pip)
+            module = os.path.splitext(filename)[0]
+            sys.path.insert(0, directory)
+            runpy.run_module(module, run_name='__main__', alter_sys=True)
+        else:
+            runpy.run_module('pip.__main__', run_name='__main__', alter_sys=True)
+    except ImportError as ex:
+        print('pip is unavailable: %s' % ex)
+        sys.exit(1)
 
 
 if __name__ == '__main__':