allow update_cache as stand alone operation for yum/dnf (#46183)

* allow update_cache as stand alone operation for yum/dnf

Fixes #40068

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

* make sanity tests happy

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

changelogs/fragments/yumdnf-update-cache.yaml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - "yum and dnf can now perform C(update_cache) as a standalone operation for consistency with other package manager modules"

lib/ansible/module_utils/yumdnf.py

@@ -48,7 +48,7 @@ yumdnf_argument_spec = dict(
         lock_poll=dict(type='int', default=-1),
         lock_timeout=dict(type='int', default=10),
     ),
-    required_one_of=[['name', 'list']],
+    required_one_of=[['name', 'list', 'update_cache']],
     mutually_exclusive=[['name', 'list']],
     supports_check_mode=True,
 )

lib/ansible/modules/packaging/os/dnf.py

@@ -576,7 +576,14 @@ class DnfModule(YumDnf):
         base = dnf.Base()
         self._configure_base(base, conf_file, disable_gpg_check, installroot)
         self._specify_repositories(base, disablerepo, enablerepo)
-        base.fill_sack(load_system_repo='auto')
+        try:
+            base.fill_sack(load_system_repo='auto')
+        except dnf.exceptions.RepoError as e:
+            self.module.fail_json(
+                msg="{0}".format(to_text(e)),
+                results=[],
+                rc=1
+            )
         if self.bugfix:
             key = {'advisory_type__eq': 'bugfix'}
             base._update_security_filters = [base.sack.query().filter(**key)]
@@ -584,7 +591,14 @@ class DnfModule(YumDnf):
             key = {'advisory_type__eq': 'security'}
             base._update_security_filters = [base.sack.query().filter(**key)]
         if self.update_cache:
-            base.update_cache()
+            try:
+                base.update_cache()
+            except dnf.exceptions.RepoError as e:
+                self.module.fail_json(
+                    msg="{0}".format(to_text(e)),
+                    results=[],
+                    rc=1
+                )
         return base
 
     def list_items(self, command):
@@ -1041,6 +1055,18 @@ class DnfModule(YumDnf):
                     results=[],
                 )
 
+        if self.update_cache and not self.names and not self.list:
+            self.base = self._base(
+                self.conf_file, self.disable_gpg_check, self.disablerepo,
+                self.enablerepo, self.installroot
+            )
+            self.module.exit_json(
+                msg="Cache updated",
+                changed=False,
+                results=[],
+                rc=0
+            )
+
         # Set state as installed by default
         # This is not set in AnsibleModule() because the following shouldn't happend
         # - dnf: autoremove=yes state=installed

lib/ansible/modules/packaging/os/yum.py

@@ -1461,6 +1461,23 @@ class YumModule(YumDnf):
         if error_msgs:
             self.module.fail_json(msg='. '.join(error_msgs))
 
+        if self.update_cache and not self.names and not self.list:
+            rc, stdout, stderr = self.module.run_command(self.yum_basecmd + ['clean', 'expire-cache'])
+            if rc == 0:
+                self.module.exit_json(
+                    changed=False,
+                    msg="Cache updated",
+                    rc=rc,
+                    results=[]
+                )
+            else:
+                self.module.exit_json(
+                    changed=False,
+                    msg="Failed to update cache",
+                    rc=rc,
+                    results=[stderr],
+                )
+
         # fedora will redirect yum to dnf, which has incompatibilities
         # with how this module expects yum to operate. If yum-deprecated
         # is available, use that instead to emulate the old behaviors.