Fix pkg_mgr_name fact finding for Fedora (#40922)

* Properly handle default package manager vs apt

For distros where apt might be installed but is not the default
package manager for the distro, properly identify the default distro
package manager during fact finding and re-use fact finding from
DistributionFactCollector and instead of reimplementing small
portions of it in PkgMgrFactCollector

Add unit test to always check the apt + Fedora combination to test
the new code.

Fixes #34014

Signed-off-by: Adam Miller <admiller@redhat.com>

* remove q debugging output I accidentally left behind

Signed-off-by: Adam Miller <admiller@redhat.com>

* add os_family to the conditional so we're only hitting that code path when needed

Signed-off-by: Adam Miller <admiller@redhat.com>

* setup for a _check* pattern for general os_family group pkg_mgr checking

Signed-off-by: Adam Miller <admiller@redhat.com>

* use Mock.patch decorator for os.path.exists in TestPkgMgrFactsAptFedora

Signed-off-by: Adam Miller <admiller@redhat.com>

lib/ansible/module_utils/facts/system/pkg_mgr.py

@@ -68,6 +68,20 @@ class PkgMgrFactCollector(BaseFactCollector):
     name = 'pkg_mgr'
     _fact_ids = set()
     _platform = 'Generic'
+    required_facts = set(['distribution'])
+
+    def _check_rh_versions(self, collected_facts):
+        if collected_facts['ansible_distribution'] == 'Fedora':
+            try:
+                if int(collected_facts['ansible_distribution_major_version']) < 15:
+                    pkg_mgr_name = 'yum'
+                else:
+                    pkg_mgr_name = 'dnf'
+            except ValueError:
+                # If there's some new magical Fedora version in the future,
+                # just default to dnf
+                pkg_mgr_name = 'dnf'
+        return pkg_mgr_name
 
     def collect(self, module=None, collected_facts=None):
         facts_dict = {}
@@ -78,10 +92,21 @@ class PkgMgrFactCollector(BaseFactCollector):
             if os.path.exists(pkg['path']):
                 pkg_mgr_name = pkg['name']
 
-        if pkg_mgr_name == 'apt' and \
+        # apt is easily installable and supported by distros other than those
-                os.path.exists('/usr/bin/rpm') and \
+        # that are debian based, this handles some of those scenarios as they
-                not os.path.exists('/usr/bin/dpkg'):
+        # are reported/requested
-            pkg_mgr_name = 'apt_rpm'
+        if pkg_mgr_name == 'apt' and collected_facts['ansible_os_family'] in ["RedHat", "Altlinux"]:
+            if collected_facts['ansible_os_family'] == 'RedHat':
+                pkg_mgr_name = self._check_rh_versions(collected_facts)
+
+            elif collected_facts['ansible_os_family'] == 'Altlinux':
+                pkg_mgr_name = 'apt_rpm'
+
+        # pacman has become available by distros other than those that are Arch
+        # based by virtue of a dependency to the systemd mkosi project, this
+        # handles some of those scenarios as they are reported/requested
+        if pkg_mgr_name == 'pacman' and collected_facts['ansible_os_family'] in ["RedHat"]:
+            pkg_mgr_name = self._check_rh_versions(collected_facts)
 
         facts_dict['pkg_mgr'] = pkg_mgr_name
         return facts_dict

test/integration/targets/package/tasks/main.yml

@@ -24,6 +24,28 @@
 - name: create our testing sub-directory
   file: path="{{ output_dir_test }}" state=directory
 
+# Verify correct default package manager for Fedora
+# Validates: https://github.com/ansible/ansible/issues/34014
+- block:
+    - name: install apt
+      dnf:
+        name: apt
+        state: present
+    - name: gather facts again
+      setup:
+    - name: validate output
+      assert:
+        that:
+          - 'ansible_pkg_mgr == "dnf"'
+  always:
+    - name: remove apt
+      dnf:
+        name: apt
+        state: absent
+    - name: gather facts again
+      setup:
+  when: ansible_distribution == "Fedora"
+
 ##
 ## package
 ##

test/units/module_utils/facts/test_ansible_collector.py

@@ -202,6 +202,8 @@ class TestCollectedFacts(unittest.TestCase):
                       'env']
     not_expected_facts = ['facter', 'ohai']
 
+    collected_facts = {}
+
     def _mock_module(self, gather_subset=None):
         return mock_module(gather_subset=self.gather_subset)
 
@@ -212,7 +214,8 @@ class TestCollectedFacts(unittest.TestCase):
         fact_collector = \
             ansible_collector.AnsibleFactCollector(collectors=collectors,
                                                    namespace=ns)
-        self.facts = fact_collector.collect(module=mock_module)
+        self.facts = fact_collector.collect(module=mock_module,
+                                            collected_facts=self.collected_facts)
 
     def _collectors(self, module,
                     all_collector_classes=None,
@@ -466,10 +469,15 @@ class TestOhaiCollectedFacts(TestCollectedFacts):
 class TestPkgMgrFacts(TestCollectedFacts):
     gather_subset = ['pkg_mgr']
     min_fact_count = 1
-    max_fact_count = 10
+    max_fact_count = 20
     expected_facts = ['gather_subset',
                       'module_setup',
                       'pkg_mgr']
+    collected_facts = {
+        "ansible_distribution": "Fedora",
+        "ansible_distribution_major_version": "28",
+        "ansible_os_family": "RedHat"
+    }
 
 
 class TestOpenBSDPkgMgrFacts(TestPkgMgrFacts):

test/units/module_utils/facts/test_collectors.py

@@ -224,6 +224,11 @@ class TestPkgMgrFacts(BaseFactsTest):
     valid_subsets = ['pkg_mgr']
     fact_namespace = 'ansible_pkgmgr'
     collector_class = PkgMgrFactCollector
+    collected_facts = {
+        "ansible_distribution": "Fedora",
+        "ansible_distribution_major_version": "28",
+        "ansible_os_family": "RedHat"
+    }
 
     def test_collect(self):
         module = self._mock_module()
@@ -233,6 +238,35 @@ class TestPkgMgrFacts(BaseFactsTest):
         self.assertIn('pkg_mgr', facts_dict)
 
 
+def _sanitize_os_path_apt_get(path):
+    if path == '/usr/bin/apt-get':
+        return True
+    else:
+        return False
+
+
+class TestPkgMgrFactsAptFedora(BaseFactsTest):
+    __test__ = True
+    gather_subset = ['!all', 'pkg_mgr']
+    valid_subsets = ['pkg_mgr']
+    fact_namespace = 'ansible_pkgmgr'
+    collector_class = PkgMgrFactCollector
+    collected_facts = {
+        "ansible_distribution": "Fedora",
+        "ansible_distribution_major_version": "28",
+        "ansible_os_family": "RedHat",
+        "ansible_pkg_mgr": "apt"
+    }
+
+    @patch('ansible.module_utils.facts.system.pkg_mgr.os.path.exists', side_effect=_sanitize_os_path_apt_get)
+    def test_collect(self, mock_os_path_exists):
+        module = self._mock_module()
+        fact_collector = self.collector_class()
+        facts_dict = fact_collector.collect(module=module, collected_facts=self.collected_facts)
+        self.assertIsInstance(facts_dict, dict)
+        self.assertIn('pkg_mgr', facts_dict)
+
+
 class TestOpenBSDPkgMgrFacts(BaseFactsTest):
     __test__ = True
     gather_subset = ['!all', 'pkg_mgr']