global: deprecated pkg_resources parse_version

Since we are only using parse_version for comparison (typically checking
that we are greater than some minimum version for tool or package), one
would think we can use packaging.version.parse as if it was parse_version

Unfortunately, this requires conforming to PEP-440 version definitions,
which does not work for e.g. autotools (2.72d) nor older openssl (1.1.1p).
We rely in these (and to be sure other) cases on the LegacyVersion behavior.

https://packaging.python.org/en/latest/specifications/version-specifiers/#summary-of-differences-from-pkg-resources-parse-version

"This specification purposely restricts the syntax which constitutes a
valid version while pkg_resources.parse_version attempts to provide some
meaning from any arbitrary string."

In order to have the least impact to the overall code, we instead add
packaging_legacy to requirements.txt and use packaging_legacy.version.parse
as if it was parse_version.

https://pypi.org/project/packaging-legacy/
https://github.com/pypa/packaging/pull/407

Since pypi.org itself is depending on packaging_legacy (in fact, a pypi dev
developed the package), we can expect it to be supported for quite some time.

https://github.com/pypi/warehouse/pull/13500

[YOCTO #15348]

Signed-off-by: Tim Orling <tim.orling@konsulko.com>

layerindex/update.py

@@ -17,7 +17,7 @@ import codecs
 import logging
 import subprocess
 from datetime import datetime, timedelta
-from pkg_resources import parse_version
+from packaging_legacy.version import parse as parse_version
 import utils
 import operator
 import re

layerindex/update_layer.py

@@ -19,7 +19,7 @@ import re
 import tempfile
 import shutil
 import errno
-from pkg_resources import parse_version
+from packaging_legacy.version import parse as parse_version
 import itertools
 import utils
 import recipeparse

layerindex/views.py

@@ -11,7 +11,7 @@ import sys
 import re
 from datetime import datetime
 from itertools import islice
-from pkg_resources import parse_version
+from packaging_legacy.version import parse as parse_version
 
 import reversion
 from django import forms

requirements.txt

@@ -24,6 +24,7 @@ gitdb==4.0.11
 GitPython==3.1.41
 kombu==5.3.4
 mysqlclient==2.2.1
+packaging_legacy==23.0.post0
 Pillow==10.2.0
 prompt-toolkit==3.0.43
 python-dateutil==2.8.2

rrs/tools/upgrade_history_internal.py

@@ -16,7 +16,7 @@ import os
 import optparse
 import logging
 import re
-from pkg_resources import parse_version
+from packaging_legacy.version import parse as parse_version
 import git
 from datetime import datetime
 import calendar