Issue 50712 - Version comparison doesn't work correctly on git builds

Bug Description:
`python3-packaging` is not shipped in RHEL8. But it's bundled with
`setuptools` which is present in all major distributions.

Fix Description:
Use `pkg_resources` module from `setuptools` which provides needed
functionality, change lib389 and rpm dependencies accordingly.

Unfortunately, `pkg_resources.parse_version()` returns different
objects for different strings too, so use `LegacyVersion` directly
from `pkg_resources.extern.packaging.version`.

Fixes:   https://pagure.io/389-ds-base/issue/50712
Relates: https://pagure.io/389-ds-base/issue/50706

rpm/389-ds-base.spec.in

@@ -130,7 +130,6 @@ BuildRequires:    python%{python3_pkgversion}-argcomplete
 BuildRequires:    python%{python3_pkgversion}-argparse-manpage
 BuildRequires:    python%{python3_pkgversion}-policycoreutils
 BuildRequires:    python%{python3_pkgversion}-libselinux
-BuildRequires:    python%{python3_pkgversion}-packaging
 
 # For cockpit
 BuildRequires:    rsync
@@ -303,7 +302,7 @@ Requires: python%{python3_pkgversion}-pyasn1-modules
 Requires: python%{python3_pkgversion}-dateutil
 Requires: python%{python3_pkgversion}-argcomplete
 Requires: python%{python3_pkgversion}-libselinux
-Requires: python%{python3_pkgversion}-packaging
+Requires: python%{python3_pkgversion}-setuptools
 %{?python_provide:%python_provide python%{python3_pkgversion}-lib389}
 
 %description -n python%{python3_pkgversion}-lib389

src/lib389/lib389/tests/utils_test.py

@@ -145,6 +145,35 @@ def test_get_log_data(data):
     assert display_log_data(before) == after
 
 
[email protected]('ds_ver, cmp_ver', [
+    ('1.3.1', '1.3.2'),
+    ('1.3.1', '1.3.10'),
+    ('1.3.2', '1.3.10'),
+    ('1.3.9', ('1.3.10', '1.4.2.0')),
+    ('1.4.0.1', ('1.3.9', '1.4.1.0', '1.4.2.1')),
+    ('1.4.1', '1.4.2.0-20191115gitbadc0ffee' ),
+])
+def test_ds_is_older_versions(ds_ver, cmp_ver):
+    if isinstance(cmp_ver, tuple):
+        assert ds_is_related('older', ds_ver, *cmp_ver)
+    else:
+        assert ds_is_related('older', ds_ver, cmp_ver)
+
[email protected]('ds_ver, cmp_ver', [
+    ('1.3.2', '1.3.1'),
+    ('1.3.10', '1.3.1'),
+    ('1.3.10', '1.3.2'),
+    ('1.3.10', ('1.3.9', '1.4.2.0')),
+    ('1.4.2.1', ('1.3.9', '1.4.0.1', '1.4.2.0')),
+    ('1.4.2.0-20191115gitbadc0ffee', '1.4.1' ),
+])
+def test_ds_is_newer_versions(ds_ver, cmp_ver):
+    if isinstance(cmp_ver, tuple):
+        assert ds_is_related('newer', ds_ver, *cmp_ver)
+    else:
+        assert ds_is_related('newer', ds_ver, cmp_ver)
+
+
 if __name__ == "__main__":
     CURRENT_FILE = os.path.realpath(__file__)
     pytest.main("-s -v %s" % CURRENT_FILE)

src/lib389/lib389/utils.py

@@ -40,7 +40,7 @@ import shlex
 import operator
 import subprocess
 import math
-from packaging.version import LegacyVersion
+from pkg_resources.extern.packaging.version import LegacyVersion
 from socket import getfqdn
 from ldapurl import LDAPUrl
 from contextlib import closing
@@ -1067,13 +1067,12 @@ def get_ds_version():
     return p.version
 
 
-def ds_is_related(relation, *ver):
+def ds_is_related(relation, ds_ver, *ver):
     """
     Return a result of a comparison between the current version of ns-slapd and a provided version.
     """
     ops = {'older': operator.lt,
            'newer': operator.ge}
-    ds_ver = get_ds_version()
     if len(ver) > 1:
         for cmp_ver in ver:
             if cmp_ver.startswith(ds_ver[:3]):
@@ -1086,14 +1085,16 @@ def ds_is_older(*ver):
     """
     Return True if the current version of ns-slapd is older than a provided version
     """
-    return ds_is_related('older', *ver)
+    ds_ver = get_ds_version()
+    return ds_is_related('older', ds_ver, *ver)
 
 
 def ds_is_newer(*ver):
     """
     Return True if the current version of ns-slapd is newer than a provided version
     """
-    return ds_is_related('newer', *ver)
+    ds_ver = get_ds_version()
+    return ds_is_related('newer', ds_ver, *ver)
 
 
 def gentime_to_datetime(gentime):

src/lib389/requirements.txt

@@ -6,4 +6,4 @@ six
 argcomplete
 argparse-manpage
 python-ldap
-packaging
+setuptools

src/lib389/setup.py

@@ -82,7 +82,7 @@ setup(
         'argcomplete',
         'argparse-manpage',
         'python-ldap',
-        'packaging',
+        'setuptools',
         ],
 
     cmdclass={