Get minor version number for CentOS and Debian (ansible#57814)

* Get the most detailed version number from distro.version() for CentOS and Debian
* Update tests and fixtures
* Update fixture generation script to gather distro info and work with Python 3
* Update LinuxMint fixtures
* Cleanup fixture formatting
* Improvements based on feedback from abadger:
    - use unicode since that is what distro returns
    - use frozenset with a tuple
    - include link Debian to bug

Author: samdoran

hacking/tests/gen_distribution_version_testcase.py

@@ -16,6 +16,7 @@
 import sys
 
 from ansible.module_utils import distro
+from ansible.module_utils._text import to_text
 
 
 filelist = [
@@ -53,13 +54,14 @@
 facts = ['distribution', 'distribution_version', 'distribution_release', 'distribution_major_version', 'os_family']
 
 try:
-    ansible_out = subprocess.check_output(
+    b_ansible_out = subprocess.check_output(
         ['ansible', 'localhost', '-m', 'setup'])
 except subprocess.CalledProcessError as e:
     print("ERROR: ansible run failed, output was: \n")
     print(e.output)
     sys.exit(e.returncode)
 
+ansible_out = to_text(b_ansible_out)
 parsed = json.loads(ansible_out[ansible_out.index('{'):])
 ansible_facts = {}
 for fact in facts:
@@ -72,6 +74,13 @@
 
 output = {
     'name': nicename,
+    'distro': {
+        'codename': distro.codename(),
+        'id': distro.id(),
+        'name': distro.name(),
+        'version': distro.version(),
+        'version_best': distro.version(best=True),
+    },
     'input': fcont,
     'platform.dist': dist,
     'result': ansible_facts,

lib/ansible/module_utils/common/sys_info.py

@@ -50,8 +50,35 @@ def get_distribution_version():
         the version, it returns empty string. If this is not run on a Linux machine it returns None
     '''
     version = None
+
+    needs_best_version = frozenset((
+        u'centos',
+        u'debian',
+    ))
+
     if platform.system() == 'Linux':
         version = distro.version()
+        distro_id = distro.id()
+
+        if version is not None:
+            if distro_id in needs_best_version:
+                version_best = distro.version(best=True)
+
+                # CentoOS maintainers believe only the major version is appropriate
+                # but Ansible users desire minor version information, e.g., 7.5.
+                # https://github.com/ansible/ansible/issues/50141#issuecomment-449452781
+                if distro_id == u'centos':
+                    version = u'.'.join(version_best.split(u'.')[:2])
+
+                # Debian does not include minor version in /etc/os-release.
+                # Bug report filed upstream requesting this be added to /etc/os-release
+                # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931197
+                if distro_id == u'debian':
+                    version = version_best
+
+        else:
+            version = u''
+
     return version