YUM4/DNF compatibility via yum action plugin (#44322)

* YUM4/DNF compatibility via yum action plugin

DNF does not natively support allow_downgrade as an option, instead
that is always the default (not configurable by the administrator)
so it had to be implemented

 - Fixed group actions in check mode to report correct changed state
 - Better error handling for depsolve and transaction errors in DNF
 - Fixed group action idempotent transactions
 - Add use_backend to yum module/action plugin
 - Fix dnf handling of autoremove (didn't used to work nor had a
   default value specified, now does work and matches default
   behavior of yum)
 - Enable installroot tests for yum4(dnf) integration testing, dnf
   backend now supports that
 - Switch from zip to bc for certain package install/remove test
   cases in yum integration tests. The dnf depsolver downgrades
   python when you uninstall zip which alters the test environment
   and we have no control over that.
 - Add changelog fragment
 - Return a pkg_mgr fact if it was not previously set.

changelogs/fragments/yum4_dnf_yum_action_plugin.yml

@@ -0,0 +1,22 @@
+---
+major_changes:
+  - yum and dnf modules now at feature parity
+  - new yum action plugin enables the yum module to work with both yum3
+    and dnf-based yum4 by detecting the backend package manager and routing
+    commands through the correct Ansible module for that python API
+  - New yumdnf module defines the shared argument specification for both
+    yum and dnf modules and provides an entry point to share code when
+    applicable
+
+minor_changes:
+  - Fixed group actions in check mode to report correct changed state
+  - Better error handling for depsolve and transaction errors in DNF
+  - Fixed group action idempotent transactions in dnf backend
+  - Add use_backend to yum module/action plugin
+  - Fix dnf handling of autoremove to be compatible with yum
+  - Enable installroot tests for yum4(dnf) integration testing, dnf
+    backend now supports that
+  - Switch from zip to bc for certain package install/remove test
+    cases in yum integration tests. The dnf depsolver downgrades
+    python when you uninstall zip which alters the test environment
+    and we have no control over that.

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

@@ -159,8 +159,14 @@ options:
     version_added: "2.7"
   allow_downgrade:
     description:
-      - This is effectively a no-op in DNF as it is the default behavior of dnf, but is an accepted parameter for feature
-        parity/compatibility with the I(yum) module.
+      - Specify if the named package and version is allowed to downgrade
+        a maybe already installed higher version of that package.
+        Note that setting allow_downgrade=True can make this module
+        behave in a non-idempotent way. The task could end up with a set
+        of packages that does not match the complete list of specified
+        packages to install (because dependencies between the downgraded
+        package and others can cause changes to the packages which were
+        in the earlier transaction).
     type: bool
     default: False
     version_added: "2.7"
@@ -240,6 +246,7 @@ EXAMPLES = '''
 '''
 
 import os
+import re
 import tempfile
 
 try:
@@ -255,7 +262,7 @@ except ImportError:
 
 from ansible.module_utils._text import to_native, to_text
 from ansible.module_utils.urls import fetch_url
-from ansible.module_utils.six import PY2
+from ansible.module_utils.six import PY2, text_type
 from distutils.version import LooseVersion
 
 from ansible.module_utils.basic import AnsibleModule
@@ -276,6 +283,115 @@ class DnfModule(YumDnf):
 
         self._ensure_dnf()
 
+    def _package_dict(self, package):
+        """Return a dictionary of information for the package."""
+        # NOTE: This no longer contains the 'dnfstate' field because it is
+        # already known based on the query type.
+        result = {
+            'name': package.name,
+            'arch': package.arch,
+            'epoch': str(package.epoch),
+            'release': package.release,
+            'version': package.version,
+            'repo': package.repoid}
+        result['nevra'] = '{epoch}:{name}-{version}-{release}.{arch}'.format(
+            **result)
+
+        # Added for YUM3/YUM4 compat
+        if package.repoid == 'installed':
+            result['yumstate'] = 'installed'
+        else:
+            result['yumstate'] = 'available'
+
+        return result
+
+    def _packagename_dict(self, packagename):
+        """
+        Return a dictionary of information for a package name string or None
+        if the package name doesn't contain at least all NVR elements
+        """
+
+        if packagename[-4:] == '.rpm':
+            packagename = packagename[:-4]
+
+        # This list was auto generated on a Fedora 28 system with the following one-liner
+        #   printf '[ '; for arch in $(ls /usr/lib/rpm/platform); do  printf '"%s", ' ${arch%-linux}; done; printf ']\n'
+        redhat_rpm_arches = [
+            "aarch64", "alphaev56", "alphaev5", "alphaev67", "alphaev6", "alpha",
+            "alphapca56", "amd64", "armv3l", "armv4b", "armv4l", "armv5tejl", "armv5tel",
+            "armv5tl", "armv6hl", "armv6l", "armv7hl", "armv7hnl", "armv7l", "athlon",
+            "geode", "i386", "i486", "i586", "i686", "ia32e", "ia64", "m68k", "mips64el",
+            "mips64", "mips64r6el", "mips64r6", "mipsel", "mips", "mipsr6el", "mipsr6",
+            "noarch", "pentium3", "pentium4", "ppc32dy4", "ppc64iseries", "ppc64le", "ppc64",
+            "ppc64p7", "ppc64pseries", "ppc8260", "ppc8560", "ppciseries", "ppc", "ppcpseries",
+            "riscv64", "s390", "s390x", "sh3", "sh4a", "sh4", "sh", "sparc64", "sparc64v",
+            "sparc", "sparcv8", "sparcv9", "sparcv9v", "x86_64"
+        ]
+
+        rpm_arch_re = re.compile(r'(.*)\.(.*)')
+        rpm_nevr_re = re.compile(r'(\S+)-(?:(\d*):)?(.*)-(~?\w+[\w.]*)')
+        try:
+            arch = None
+            rpm_arch_match = rpm_arch_re.match(packagename)
+            if rpm_arch_match:
+                nevr, arch = rpm_arch_match.groups()
+                if arch in redhat_rpm_arches:
+                    packagename = nevr
+            rpm_nevr_match = rpm_nevr_re.match(packagename)
+            if rpm_nevr_match:
+                name, epoch, version, release = rpm_nevr_re.match(packagename).groups()
+                if not version or not version.split('.')[0].isdigit():
+                    return None
+            else:
+                return None
+        except AttributeError as e:
+            self.module.fail_json(
+                msg='Error attempting to parse package: %s, %s' % (packagename, to_native(e)),
+                rc=1,
+                results=[]
+            )
+
+        if not epoch:
+            epoch = "0"
+
+        if ':' in name:
+            epoch_name = name.split(":")
+
+            epoch = epoch_name[0]
+            name = ''.join(epoch_name[1:])
+
+        result = {
+            'name': name,
+            'epoch': epoch,
+            'release': release,
+            'version': version,
+        }
+
+        return result
+
+    # Original implementation from yum.rpmUtils.miscutils (GPLv2+)
+    #   http://yum.baseurl.org/gitweb?p=yum.git;a=blob;f=rpmUtils/miscutils.py
+    def _compare_evr(self, e1, v1, r1, e2, v2, r2):
+        # return 1: a is newer than b
+        # 0: a and b are the same version
+        # -1: b is newer than a
+        if e1 is None:
+            e1 = '0'
+        else:
+            e1 = str(e1)
+        v1 = str(v1)
+        r1 = str(r1)
+        if e2 is None:
+            e2 = '0'
+        else:
+            e2 = str(e2)
+        v2 = str(v2)
+        r2 = str(r2)
+        # print '%s, %s, %s vs %s, %s, %s' % (e1, v1, r1, e2, v2, r2)
+        rc = dnf.rpm.rpm.labelCompare((e1, v1, r1), (e2, v2, r2))
+        # print '%s, %s, %s vs %s, %s, %s = %s' % (e1, v1, r1, e2, v2, r2, rc)
+        return rc
+
     def fetch_rpm_from_url(self, spec):
         # FIXME: Remove this once this PR is merged:
         #   https://github.com/ansible/ansible/pull/19172
@@ -287,14 +403,20 @@ class DnfModule(YumDnf):
         try:
             rsp, info = fetch_url(self.module, spec)
             if not rsp:
-                self.module.fail_json(msg="Failure downloading %s, %s" % (spec, info['msg']))
+                self.module.fail_json(
+                    msg="Failure downloading %s, %s" % (spec, info['msg']),
+                    results=[],
+                )
             data = rsp.read(BUFSIZE)
             while data:
                 package_file.write(data)
                 data = rsp.read(BUFSIZE)
             package_file.close()
         except Exception as e:
-            self.module.fail_json(msg="Failure downloading %s, %s" % (spec, to_native(e)))
+            self.module.fail_json(
+                msg="Failure downloading %s, %s" % (spec, to_native(e)),
+                results=[],
+            )
 
         return package_file.name
 
@@ -308,7 +430,8 @@ class DnfModule(YumDnf):
             if self.module.check_mode:
                 self.module.fail_json(
                     msg="`{0}` is not installed, but it is required"
-                    "for the Ansible dnf module.".format(package)
+                    "for the Ansible dnf module.".format(package),
+                    results=[],
                 )
 
             self.module.run_command(['dnf', 'install', '-y', package], check_rc=True)
@@ -323,7 +446,8 @@ class DnfModule(YumDnf):
             except ImportError:
                 self.module.fail_json(
                     msg="Could not import the dnf python module. "
-                    "Please install `{0}` package.".format(package)
+                    "Please install `{0}` package.".format(package),
+                    results=[],
                 )
 
     def _configure_base(self, base, conf_file, disable_gpg_check, installroot='/'):
@@ -356,7 +480,7 @@ class DnfModule(YumDnf):
 
         # Set disable_excludes
         if self.disable_excludes:
-            conf.disable_excludes = [self.disable_excludes]
+            conf.disable_excludes.append(self.disable_excludes)
 
         # Set releasever
         if self.releasever is not None:
@@ -374,10 +498,15 @@ class DnfModule(YumDnf):
             # Fail if we can't read the configuration file.
             if not os.access(conf_file, os.R_OK):
                 self.module.fail_json(
-                    msg="cannot read configuration file", conf_file=conf_file)
+                    msg="cannot read configuration file", conf_file=conf_file,
+                    results=[],
+                )
             else:
                 conf.config_file_path = conf_file
 
+        # Default in dnf upstream is true
+        conf.clean_requirements_on_remove = self.autoremove
+
         # Read the configuration file
         conf.read()
 
@@ -412,22 +541,6 @@ class DnfModule(YumDnf):
             base.update_cache()
         return base
 
-    def _package_dict(self, package):
-        """Return a dictionary of information for the package."""
-        # NOTE: This no longer contains the 'dnfstate' field because it is
-        # already known based on the query type.
-        result = {
-            'name': package.name,
-            'arch': package.arch,
-            'epoch': str(package.epoch),
-            'release': package.release,
-            'version': package.version,
-            'repo': package.repoid}
-        result['nevra'] = '{epoch}:{name}-{version}-{release}.{arch}'.format(
-            **result)
-
-        return result
-
     def list_items(self, command):
         """List package info based on the command."""
         # Rename updates to upgrades
@@ -449,14 +562,138 @@ class DnfModule(YumDnf):
             packages = dnf.subject.Subject(command).get_best_query(self.base.sack)
             results = [self._package_dict(package) for package in packages]
 
-        self.module.exit_json(results=results)
+        self.module.exit_json(msg="", results=results)
 
-    def _mark_package_install(self, pkg_spec):
-        """Mark the package for install."""
+    def _is_installed(self, pkg):
+        installed = self.base.sack.query().installed()
+        if installed.filter(name=pkg):
+            return True
+        else:
+            return False
+
+    def _is_group_installed(self, group):
+        """
+        Check if a group is installed (the sum of the package set that makes up a group)
+
+        This is necessary until the upstream dnf API bug is fixed where installing
+        a group via the dnf API doesn't actually mark the group as installed
+            https://bugzilla.redhat.com/show_bug.cgi?id=1620324
+        """
+        pkg_set = []
+        dnf_group = self.base.comps.group_by_pattern(group)
         try:
-            self.base.install(pkg_spec)
-        except dnf.exceptions.MarkingError:
-            self.module.fail_json(msg="No package {0} available.".format(pkg_spec))
+            if dnf_group:
+                for pkg_type in dnf.const.GROUP_PACKAGE_TYPES:
+                    for pkg in getattr(dnf_group, '{0}_packages'.format(pkg_type)):
+                        pkg_set.append(pkg.name)
+        except AttributeError as e:
+            self.module.fail_json(
+                msg="Error attempting to determine package group installed status: {0}".format(group),
+                results=[],
+                rc=1,
+                failures=[to_native(e), ],
+            )
+
+        for pkg in pkg_set:
+            if not self._is_installed(pkg):
+                return False
+
+        return True
+
+    def _is_newer_version_installed(self, pkg_name):
+        candidate_pkg = self._packagename_dict(pkg_name)
+        if not candidate_pkg:
+            # The user didn't provide a versioned rpm, so version checking is
+            # not required
+            return False
+
+        installed = self.base.sack.query().installed()
+        installed_pkg = installed.filter(name=candidate_pkg['name']).run()
+        if installed_pkg:
+            installed_pkg = installed_pkg[0]
+
+            # this looks weird but one is a dict and the other is a dnf.Package
+            evr_cmp = self._compare_evr(
+                installed_pkg.epoch, installed_pkg.version, installed_pkg.release,
+                candidate_pkg['epoch'], candidate_pkg['version'], candidate_pkg['release'],
+            )
+
+            if evr_cmp == 1:
+                return True
+            else:
+                return False
+
+        else:
+
+            return False
+
+    def _mark_package_install(self, pkg_spec, upgrade=False):
+        """Mark the package for install."""
+        is_newer_version_installed = self._is_newer_version_installed(pkg_spec)
+        is_installed = self._is_installed(pkg_spec)
+        try:
+            if self.allow_downgrade:
+                # dnf only does allow_downgrade, we have to handle this ourselves
+                # because it allows a possibility for non-idempotent transactions
+                # on a system's package set (pending the yum repo has many old
+                # NVRs indexed)
+                if upgrade:
+                    if is_installed:
+                        self.base.upgrade(pkg_spec)
+                    else:
+                        self.base.install(pkg_spec)
+                else:
+                    self.base.install(pkg_spec)
+            elif not self.allow_downgrade and is_newer_version_installed:
+                return {'failed': False, 'msg': '', 'failure': '', 'rc': 0}
+            elif not is_newer_version_installed:
+                if upgrade:
+                    if is_installed:
+                        self.base.upgrade(pkg_spec)
+                    else:
+                        self.base.install(pkg_spec)
+                else:
+                    self.base.install(pkg_spec)
+            else:
+                if upgrade:
+                    if is_installed:
+                        self.base.upgrade(pkg_spec)
+                    else:
+                        self.base.install(pkg_spec)
+                else:
+                    self.base.install(pkg_spec)
+
+            return {'failed': False, 'msg': 'Installed: {0}'.format(pkg_spec), 'failure': '', 'rc': 0}
+
+        except dnf.exceptions.MarkingError as e:
+            return {
+                'failed': True,
+                'msg': "No package {0} available.".format(pkg_spec),
+                'failure': " ".join((pkg_spec, to_native(e))),
+                'rc': 1,
+                "results": []
+            }
+
+        except dnf.exceptions.DepsolveError as e:
+            return {
+                'failed': True,
+                'msg': "Depsolve Error occured for package {0}.".format(pkg_spec),
+                'failure': " ".join((pkg_spec, to_native(e))),
+                'rc': 1,
+                "results": []
+            }
+
+        except dnf.exceptions.Error as e:
+            if to_text("already installed") in to_text(e):
+                return {'failed': False, 'msg': '', 'failure': ''}
+            else:
+                return {
+                    'failed': True,
+                    'msg': "Unknown Error occured for package {0}.".format(pkg_spec),
+                    'failure': " ".join((pkg_spec, to_native(e))),
+                    'rc': 1,
+                    "results": []
+                }
 
     def _parse_spec_group_file(self):
         pkg_specs, grp_specs, filenames = [], [], []
@@ -472,29 +709,75 @@ class DnfModule(YumDnf):
         return pkg_specs, grp_specs, filenames
 
     def _update_only(self, pkgs):
-        installed = self.base.sack.query().installed()
+        not_installed = []
         for pkg in pkgs:
-            if installed.filter(name=pkg):
-                self.base.package_upgrade(pkg)
+            if self._is_installed(pkg):
+                try:
+                    if isinstance(to_text(pkg), text_type):
+                        self.base.upgrade(pkg)
+                    else:
+                        self.base.package_upgrade(pkg)
+                except Exception as e:
+                    self.module.fail_json(
+                        msg="Error occured attempting update_only operation: {0}".format(to_native(e)),
+                        results=[],
+                        rc=1,
+                    )
+            else:
+                not_installed.append(pkg)
+
+        return not_installed
 
     def _install_remote_rpms(self, filenames):
         if int(dnf.__version__.split(".")[0]) >= 2:
             pkgs = list(sorted(self.base.add_remote_rpms(list(filenames)), reverse=True))
         else:
             pkgs = []
-            for filename in filenames:
-                pkgs.append(self.base.add_remote_rpm(filename))
+            try:
+                for filename in filenames:
+                    pkgs.append(self.base.add_remote_rpm(filename))
+            except IOError as e:
+                if to_text("Can not load RPM file") in to_text(e):
+                    self.module.fail_json(
+                        msg="Error occured attempting remote rpm install of package: {0}. {1}".format(filename, to_native(e)),
+                        results=[],
+                        rc=1,
+                    )
         if self.update_only:
             self._update_only(pkgs)
         else:
             for pkg in pkgs:
-                self.base.package_install(pkg)
+                try:
+                    if self._is_newer_version_installed(self._package_dict(pkg)['nevra']):
+                        if self.allow_downgrade:
+                            self.base.package_install(pkg)
+                    else:
+                            self.base.package_install(pkg)
+                except Exception as e:
+                    self.module.fail_json(
+                        msg="Error occured attempting remote rpm operation: {0}".format(to_native(e)),
+                        results=[],
+                        rc=1,
+                    )
 
     def ensure(self):
+        allow_erasing = False
+
+        response = {
+            'msg': "",
+            'changed': False,
+            'results': [],
+            'rc': 0
+        }
+
         # Accumulate failures.  Package management modules install what they can
         # and fail with a message about what they can't.
-        failures = []
-        allow_erasing = False
+        failure_response = {
+            'msg': "",
+            'failures': [],
+            'results': [],
+            'rc': 1
+        }
 
         # Autoremove is called alone
         # Jump to remove path where base.autoremove() is run
@@ -503,7 +786,11 @@ class DnfModule(YumDnf):
             self.state = 'absent'
 
         if self.names == ['*'] and self.state == 'latest':
-            self.base.upgrade_all()
+            try:
+                self.base.upgrade_all()
+            except dnf.exceptions.DepsolveError as e:
+                failure_response['msg'] = "Depsolve Error occured attempting to upgrade all packages"
+                self.module.fail_json(**failure_response)
         else:
             pkg_specs, group_specs, filenames = self._parse_spec_group_file()
             if group_specs:
@@ -523,48 +810,72 @@ class DnfModule(YumDnf):
                         environments.append(environment.id)
                     else:
                         self.module.fail_json(
-                            msg="No group {0} available.".format(group_spec))
+                            msg="No group {0} available.".format(group_spec),
+                            results=[],
+                        )
 
             if self.state in ['installed', 'present']:
                 # Install files.
                 self._install_remote_rpms(filenames)
+                for filename in filenames:
+                    response['results'].append("Installed {0}".format(filename))
 
                 # Install groups.
                 for group in groups:
                     try:
-                        self.base.group_install(group, dnf.const.GROUP_PACKAGE_TYPES)
+                        if self._is_group_installed(group):
+                            response['results'].append("Group {0} already installed.".format(group))
+                        else:
+                            self.base.group_install(group, dnf.const.GROUP_PACKAGE_TYPES)
+                            response['results'].append("Group {0} installed.".format(group))
+                    except dnf.exceptions.DepsolveError as e:
+                        failure_response['msg'] = "Depsolve Error occured attempting to install group: {0}".format(group)
+                        self.module.fail_json(**failure_response)
                     except dnf.exceptions.Error as e:
                         # In dnf 2.0 if all the mandatory packages in a group do
                         # not install, an error is raised.  We want to capture
                         # this but still install as much as possible.
-                        failures.append((group, to_native(e)))
+                        failure_response['failures'].append(" ".join((group, to_native(e))))
 
                 for environment in environments:
                     try:
                         self.base.environment_install(environment, dnf.const.GROUP_PACKAGE_TYPES)
+                    except dnf.exceptions.DepsolveError as e:
+                        failure_response['msg'] = "Depsolve Error occured attempting to install environment: {0}".format(environment)
+                        self.module.fail_json(**failure_response)
                     except dnf.exceptions.Error as e:
-                        failures.append((environment, to_native(e)))
+                        failure_response['failures'].append(" ".join((environment, to_native(e))))
 
                 # Install packages.
                 if self.update_only:
-                    self._update_only(pkg_specs)
+                    not_installed = self._update_only(pkg_specs)
+                    for spec in not_installed:
+                        response['results'].append("Packages providing %s not installed due to update_only specified" % spec)
                 else:
                     for pkg_spec in pkg_specs:
-                        self._mark_package_install(pkg_spec)
+                        install_result = self._mark_package_install(pkg_spec)
+                        if install_result['failed']:
+                            failure_response['msg'] += install_result['msg']
+                            failure_response['failures'].append(install_result['failure'])
 
             elif self.state == 'latest':
                 # "latest" is same as "installed" for filenames.
                 self._install_remote_rpms(filenames)
+                for filename in filenames:
+                    response['results'].append("Installed {0}".format(filename))
 
                 for group in groups:
                     try:
                         try:
                             self.base.group_upgrade(group)
+                            response['results'].append("Group {0} upgraded.".format(group))
                         except dnf.exceptions.CompsError:
-                            # If not already installed, try to install.
-                            self.base.group_install(group, dnf.const.GROUP_PACKAGE_TYPES)
+                            if not self.update_only:
+                                # If not already installed, try to install.
+                                self.base.group_install(group, dnf.const.GROUP_PACKAGE_TYPES)
+                                response['results'].append("Group {0} installed.".format(group))
                     except dnf.exceptions.Error as e:
-                        failures.append((group, to_native(e)))
+                        failure_response['failures'].append(" ".join((group, to_native(e))))
 
                 for environment in environments:
                     try:
@@ -573,29 +884,32 @@ class DnfModule(YumDnf):
                         except dnf.exceptions.CompsError:
                             # If not already installed, try to install.
                             self.base.environment_install(environment, dnf.const.GROUP_PACKAGE_TYPES)
+                    except dnf.exceptions.DepsolveError as e:
+                        failure_response['msg'] = "Depsolve Error occured attempting to install environment: {0}".format(environment)
                     except dnf.exceptions.Error as e:
-                        failures.append((environment, to_native(e)))
+                        failure_response['failures'].append(" ".join((environment, to_native(e))))
 
                 if self.update_only:
-                    self._update_only(pkg_specs)
+                    not_installed = self._update_only(pkg_specs)
+                    for spec in not_installed:
+                        response['results'].append("Packages providing %s not installed due to update_only specified" % spec)
                 else:
                     for pkg_spec in pkg_specs:
                         # best effort causes to install the latest package
                         # even if not previously installed
                         self.base.conf.best = True
-                        try:
-                            self.base.install(pkg_spec)
-                        except dnf.exceptions.MarkingError as e:
-                            failures.append((pkg_spec, to_native(e)))
+                        install_result = self._mark_package_install(pkg_spec, upgrade=True)
+                        if install_result['failed']:
+                            failure_response['msg'] += install_result['msg']
+                            failure_response['failures'].append(install_result['failure'])
 
             else:
                 # state == absent
-                if self.autoremove:
-                    self.base.conf.clean_requirements_on_remove = self.autoremove
-
                 if filenames:
                     self.module.fail_json(
-                        msg="Cannot remove paths -- please specify package name.")
+                        msg="Cannot remove paths -- please specify package name.",
+                        results=[],
+                    )
 
                 for group in groups:
                     try:
@@ -604,6 +918,24 @@ class DnfModule(YumDnf):
                         # Group is already uninstalled.
                         pass
 
+                    # This is necessary until the upstream dnf API bug is fixed where installing
+                    # a group via the dnf API doesn't actually mark the group as installed
+                    #   https://bugzilla.redhat.com/show_bug.cgi?id=1620324
+                    if self._is_group_installed(group):
+                        dnf_group = self.base.comps.group_by_pattern(group)
+                        try:
+                            if dnf_group:
+                                for pkg_type in dnf.const.GROUP_PACKAGE_TYPES:
+                                    for pkg_spec in getattr(dnf_group, '{0}_packages'.format(pkg_type)):
+                                        self.base.remove(pkg_spec.name)
+                        except AttributeError as e:
+                            self.module.fail_json(
+                                msg="Error attempting to determine package group installed status: {0}".format(group),
+                                results=[],
+                                rc=1,
+                                failures=[to_native(e), ],
+                            )
+
                 for environment in environments:
                     try:
                         self.base.environment_remove(environment)
@@ -623,45 +955,57 @@ class DnfModule(YumDnf):
                 if self.autoremove:
                     self.base.autoremove()
 
-        if not self.base.resolve(allow_erasing=allow_erasing):
-            if failures:
-                self.module.fail_json(
-                    msg='Failed to install some of the specified packages',
-                    failures=failures
-                )
-            self.module.exit_json(msg="Nothing to do")
-        else:
-            if self.module.check_mode:
-                if failures:
-                    self.module.fail_json(
-                        msg='Failed to install some of the specified packages',
-                        failures=failures
-                    )
-                self.module.exit_json(changed=True)
+        try:
+            if not self.base.resolve(allow_erasing=allow_erasing):
+                if failure_response['failures']:
+                    failure_response['msg'] = 'Failed to install some of the specified packages'
+                    self.module.fail_json(**failure_response)
 
-            try:
-                self.base.download_packages(self.base.transaction.install_set)
-            except dnf.exceptions.DownloadError as e:
-                self.module.fail_json(msg="Failed to download packages: {0}".format(to_text(e)))
-
-            response = {'changed': True, 'results': []}
-            if self.download_only:
-                for package in self.base.transaction.install_set:
-                    response['results'].append("Downloaded: {0}".format(package))
+                response['msg'] = "Nothing to do"
                 self.module.exit_json(**response)
             else:
-                self.base.do_transaction()
-                for package in self.base.transaction.install_set:
-                    response['results'].append("Installed: {0}".format(package))
-                for package in self.base.transaction.remove_set:
-                    response['results'].append("Removed: {0}".format(package))
+                response['changed'] = True
+                if self.module.check_mode:
+                    if failure_response['failures']:
+                        failure_response['msg'] = 'Failed to install some of the specified packages',
+                        self.module.fail_json(**failure_response)
+                    response['msg'] = "Check mode: No changes made, but would have if not in check mode"
+                    self.module.exit_json(**response)
 
-            if failures:
-                self.module.fail_json(
-                    msg='Failed to install some of the specified packages',
-                    failures=failures
-                )
-            self.module.exit_json(**response)
+                try:
+                    self.base.download_packages(self.base.transaction.install_set)
+                except dnf.exceptions.DownloadError as e:
+                    self.module.fail_json(
+                        msg="Failed to download packages: {0}".format(to_text(e)),
+                        results=[],
+                    )
+
+                if self.download_only:
+                    for package in self.base.transaction.install_set:
+                        response['results'].append("Downloaded: {0}".format(package))
+                    self.module.exit_json(**response)
+                else:
+                    self.base.do_transaction()
+                    for package in self.base.transaction.install_set:
+                        response['results'].append("Installed: {0}".format(package))
+                    for package in self.base.transaction.remove_set:
+                        response['results'].append("Removed: {0}".format(package))
+
+                if failure_response['failures']:
+                    failure_response['msg'] = 'Failed to install some of the specified packages',
+                    self.module.exit_json(**response)
+                self.module.exit_json(**response)
+        except dnf.exceptions.DepsolveError as e:
+            failure_response['msg'] = "Depsolve Error occured: {0}".format(to_native(e))
+            self.module.fail_json(**failure_response)
+        except dnf.exceptions.Error as e:
+            if to_text("already installed") in to_text(e):
+                response['changed'] = False
+                response['results'].append("Package already installed: {0}".format(to_native(e)))
+                self.module.exit_json(**response)
+            else:
+                failure_response['msg'] = "Unknown Error occured: {0}".format(to_native(e))
+                self.module.fail_json(**failure_response)
 
     @staticmethod
     def has_dnf():
@@ -673,9 +1017,15 @@ class DnfModule(YumDnf):
         # Check if autoremove is called correctly
         if self.autoremove:
             if LooseVersion(dnf.__version__) < LooseVersion('2.0.1'):
-                self.module.fail_json(msg="Autoremove requires dnf>=2.0.1. Current dnf version is %s" % dnf.__version__)
+                self.module.fail_json(
+                    msg="Autoremove requires dnf>=2.0.1. Current dnf version is %s" % dnf.__version__,
+                    results=[],
+                )
             if self.state not in ["absent", None]:
-                self.module.fail_json(msg="Autoremove should be used alone or with state=absent")
+                self.module.fail_json(
+                    msg="Autoremove should be used alone or with state=absent",
+                    results=[],
+                )
 
         # Set state as installed by default
         # This is not set in AnsibleModule() because the following shouldn't happend
@@ -688,12 +1038,15 @@ class DnfModule(YumDnf):
                 self.conf_file, self.disable_gpg_check, self.disablerepo,
                 self.enablerepo, self.installroot
             )
-            self.list_items(self.module, self.list)
+            self.list_items(self.list)
         else:
             # Note: base takes a long time to run so we want to check for failure
             # before running it.
             if not dnf.util.am_i_root():
-                self.module.fail_json(msg="This command has to be run under the root user.")
+                self.module.fail_json(
+                    msg="This command has to be run under the root user.",
+                    results=[],
+                )
             self.base = self._base(
                 self.conf_file, self.disable_gpg_check, self.disablerepo,
                 self.enablerepo, self.installroot
@@ -722,7 +1075,7 @@ def main():
     try:
         module_implementation.run()
     except dnf.exceptions.RepoError as de:
-        module.exit_json(msg="Failed to synchronize repodata: {0}".format(de))
+        module.exit_json(msg="Failed to synchronize repodata: {0}".format(to_native(de)))
 
 
 if __name__ == '__main__':

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

@@ -23,6 +23,16 @@ description:
      - Installs, upgrade, downgrades, removes, and lists packages and groups with the I(yum) package manager.
      - This module only works on Python 2. If you require Python 3 support see the M(dnf) module.
 options:
+  use_backend:
+    description:
+      - This module supports C(yum) (as it always has), this is known as C(yum3)/C(YUM3)/C(yum-deprecated) by
+        upstream yum developers. As of Ansible 2.7+, this module also supports C(YUM4), which is the
+        "new yum" and it has an C(dnf) backend.
+      - By default, this module will select the backend based on the C(ansible_pkg_mgr) fact.
+    required: false
+    default: "auto"
+    choices: [ auto, yum, yum4, dnf ]
+    version_added: "2.7"
   name:
     description:
       - A package name or package specifier with version, like C(name-1.0).
@@ -1501,6 +1511,8 @@ def main():
     #   list=repos
     #   list=pkgspec
 
+    yumdnf_argument_spec['argument_spec']['use_backend'] = dict(default='auto', choices=['auto', 'yum', 'yum4', 'dnf'])
+
     module = AnsibleModule(
         **yumdnf_argument_spec
     )

lib/ansible/plugins/action/yum.py

@@ -0,0 +1,100 @@
+# (c) 2018, Ansible Project
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+from ansible.plugins.action import ActionBase
+
+try:
+    from __main__ import display
+except ImportError:
+    from ansible.utils.display import Display
+    display = Display()
+
+
+class ActionModule(ActionBase):
+
+    TRANSFERS_FILES = False
+
+    def run(self, tmp=None, task_vars=None):
+        '''
+        Action plugin handler for yum3 vs yum4(dnf) operations.
+
+        Enables the yum module to use yum3 and/or yum4. Yum4 is a yum
+        command-line compatibility layer on top of dnf. Since the Ansible
+        modules for yum(aka yum3) and dnf(aka yum4) call each of yum3 and yum4's
+        python APIs natively on the backend, we need to handle this here and
+        pass off to the correct Ansible module to execute on the remote system.
+        '''
+
+        self._supports_check_mode = True
+        self._supports_async = True
+
+        result = super(ActionModule, self).run(tmp, task_vars)
+        del tmp  # tmp no longer has any effect
+
+        # Carry-over concept from the package action plugin
+        module = self._task.args.get('use_backend', "auto")
+
+        if module == 'auto':
+            try:
+                if self._task.delegate_to:  # if we delegate, we should use delegated host's facts
+                    module = self._templar.template("{{hostvars['%s']['ansible_facts']['pkg_mgr']}}" % self._task.delegate_to)
+                else:
+                    module = self._templar.template("{{ansible_facts.pkg_mgr}}")
+            except Exception:
+                pass  # could not get it from template!
+
+        if module not in ["yum", "yum4", "dnf"]:
+            facts = self._execute_module(module_name="setup", module_args=dict(filter="ansible_pkg_mgr", gather_subset="!all"), task_vars=task_vars)
+            display.debug("Facts %s" % facts)
+            module = facts.get("ansible_facts", {}).get("ansible_pkg_mgr", "auto")
+            if (not self._task.delegate_to or self._task.delegate_facts) and module != 'auto':
+                result['ansible_facts'] = {'pkg_mgr': module}
+
+        if module != "auto":
+
+            if module == "yum4":
+                module = "dnf"
+
+            if module not in self._shared_loader_obj.module_loader:
+                result.update({'failed': True, 'msg': "Could not find a yum module backend for %s." % module})
+            else:
+                # run either the yum (yum3) or dnf (yum4) backend module
+                new_module_args = self._task.args.copy()
+                if 'use_backend' in new_module_args:
+                    del new_module_args['use_backend']
+
+                display.vvvv("Running %s as the backend for the yum action plugin" % module)
+                result.update(self._execute_module(module_name=module, module_args=new_module_args, task_vars=task_vars, wrap_async=self._task.async_val))
+                # Now fall through to cleanup
+        else:
+            result.update(
+                {
+                    'failed': True,
+                    'msg': ("Could not detect which major revision of yum is in use, which is required to determine module backend.",
+                            "You can manually specify use_backend to tell the module whether to use the yum (yum3) or dnf (yum4) backend})"),
+                }
+            )
+            # Now fall through to cleanup
+
+        # Cleanup
+        if not self._task.async_val:
+            # remove a temporary path we created
+            self._remove_tmp_path(self._connection._shell.tmpdir)
+
+        return result

test/integration/targets/dnf/tasks/dnf.yml

@@ -301,6 +301,11 @@
         - "'changed' in dnf_result"
         - "'msg' in dnf_result"
 
+- name: verify that bc is not installed
+  dnf:
+    name: bc
+    state: absent
+
 - name: install the group again but also with a package that is not yet installed
   dnf:
     name:

test/integration/targets/dnf/tasks/repo.yml

@@ -87,6 +87,7 @@
       dnf:
         name: "{{ repodir }}/foo-1.0-1.{{ ansible_architecture }}.rpm"
         state: present
+        allow_downgrade: True
       register: dnf_result
 
     - name: Check foo with rpm

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

@@ -42,7 +42,7 @@
       mode: 0755
 
   - name: Create RPMs and put them into a repo
-    shell: "python /tmp/create-repo.py {{ ansible_architecture }}"
+    shell: "{{ansible_python_interpreter}} /tmp/create-repo.py {{ ansible_architecture }}"
     register: repo
 
   - set_fact:
@@ -56,7 +56,7 @@
       gpgcheck: no
 
   - name: Create RPMs and put them into a repo (i686)
-    shell: "python /tmp/create-repo.py i686"
+    shell: "{{ansible_python_interpreter}} /tmp/create-repo.py i686"
     register: repo_i686
 
   - set_fact:
@@ -70,7 +70,7 @@
       gpgcheck: no
 
   - name: Create RPMs and put them into a repo (ppc64)
-    shell: "python /tmp/create-repo.py ppc64"
+    shell: "{{ansible_python_interpreter}} /tmp/create-repo.py ppc64"
     register: repo_ppc64
 
   - set_fact:

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

@@ -46,8 +46,8 @@
         - ansible_distribution in ['RedHat', 'CentOS', 'ScientificLinux'] and ansible_distribution_major_version|int <= 6
   when:
     - ansible_distribution in ['RedHat', 'CentOS', 'ScientificLinux', 'Fedora']
-    - ansible_python.version.major == 2
 
+# DNF1 doesn't handle downgrade operations properly (Fedora < 26)
 - block:
     - include: 'repo.yml'
   always:
@@ -58,16 +58,10 @@
     - command: yum clean metadata
   when:
     - ansible_distribution in ['RedHat', 'CentOS', 'ScientificLinux', 'Fedora']
-    - ansible_python.version.major == 2
 
-# We can't run yum --installroot tests on dnf systems.  Dnf systems revert to
-# yum-deprecated, and yum-deprecated refuses to run if yum.conf exists
-# so we cannot configure yum-deprecated correctly in an empty /tmp/fake.root/
-# It will always run with $releasever unset
 - include: 'yuminstallroot.yml'
   when:
-    - (ansible_distribution in ['RedHat', 'CentOS', 'ScientificLinux'] or (ansible_distribution in ['Fedora'] and ansible_distribution_major_version|int < 23))
-    - ansible_python.version.major == 2
+    - ansible_distribution in ['RedHat', 'CentOS', 'ScientificLinux', 'Fedora']
 
 # el6 has a broken yum group implementation, when you try to remove a group it goes through
 # deps and ends up with trying to remove yum itself and the whole process fails
@@ -75,4 +69,3 @@
 - include: 'yum_group_remove.yml'
   when:
     - (ansible_distribution in ['RedHat', 'CentOS', 'ScientificLinux'] and ansible_distribution_major_version|int > 6) or ansible_distribution in ['Fedora']
-    - ansible_python.version.major == 2

test/integration/targets/yum/tasks/repo.yml

@@ -73,10 +73,11 @@
         name: foo
         state: absent
     # ============================================================================
-    - name: Install 1:foo-1.0-2
+    - name: Downgrade foo
       yum:
-        name: "1:foo-1.0-2.{{ ansible_architecture }}"
+        name: foo-1.0-1
         state: present
+        allow_downgrade: yes
       register: yum_result
 
     - name: Check foo with rpm
@@ -87,30 +88,7 @@
       assert:
         that:
             - "yum_result.changed"
-            - "rpm_result.stdout.startswith('foo-1.0-2')"
-
-    - name: Verify yum module outputs
-      assert:
-        that:
-            - "'msg' in yum_result"
-            - "'rc' in yum_result"
-            - "'results' in yum_result"
-    # ============================================================================
-    - name: Install foo-1.0-2 again
-      yum:
-        name: foo-1.0-2
-        state: present
-      register: yum_result
-
-    - name: Check foo with rpm
-      shell: rpm -q foo
-      register: rpm_result
-
-    - name: Verify installation
-      assert:
-        that:
-            - "not yum_result.changed"
-            - "rpm_result.stdout.startswith('foo-1.0-2')"
+            - "rpm_result.stdout.startswith('foo-1.0-1')"
 
     - name: Verify yum module outputs
       assert:
@@ -279,30 +257,6 @@
             - "not yum_result.changed"
             - "rpm_result.stdout.startswith('foo-1.0-2')"
 
-    - name: Verify yum module outputs
-      assert:
-        that:
-            - "'msg' in yum_result"
-            - "'rc' in yum_result"
-            - "'results' in yum_result"
-    # ============================================================================
-    - name: Downgrade foo
-      yum:
-        name: foo-1.0-1
-        state: present
-        allow_downgrade: yes
-      register: yum_result
-
-    - name: Check foo with rpm
-      shell: rpm -q foo
-      register: rpm_result
-
-    - name: Verify installation
-      assert:
-        that:
-            - "yum_result.changed"
-            - "rpm_result.stdout.startswith('foo-1.0-1')"
-
     - name: Verify yum module outputs
       assert:
         that:
@@ -506,3 +460,99 @@
       yum:
         name: foo
         state: absent
+
+# FIXME: dnf currently doesn't support epoch as part of it's pkg_spec for
+#        finding install candidates
+#         https://bugzilla.redhat.com/show_bug.cgi?id=1619687
+- block:
+    - name: Install 1:foo-1.0-2
+      yum:
+        name: "1:foo-1.0-2.{{ ansible_architecture }}"
+        state: present
+      register: yum_result
+
+    - name: Check foo with rpm
+      shell: rpm -q foo
+      register: rpm_result
+
+    - name: Verify installation
+      assert:
+        that:
+            - "yum_result.changed"
+            - "rpm_result.stdout.startswith('foo-1.0-2')"
+
+    - name: Verify yum module outputs
+      assert:
+        that:
+            - "'msg' in yum_result"
+            - "'rc' in yum_result"
+            - "'results' in yum_result"
+  always:
+    - name: Clean up
+      yum:
+        name: foo
+        state: absent
+
+  when: ansible_pkg_mgr == 'yum'
+
+# DNF1 (Fedora < 26) had some issues:
+# - did not accept architecture tag as valid component of a package spec unless
+#   installing a file (i.e. can't search the repo)
+# - doesn't handle downgrade transactions via the API properly, marks it as a
+#   conflict
+#
+# NOTE: Both DNF1 and Fedora < 26 have long been EOL'd by their respective
+#       upstreams
+- block:
+    # ============================================================================
+    - name: Install foo-1.0-2
+      yum:
+        name: "foo-1.0-2.{{ ansible_architecture }}"
+        state: present
+      register: yum_result
+
+    - name: Check foo with rpm
+      shell: rpm -q foo
+      register: rpm_result
+
+    - name: Verify installation
+      assert:
+        that:
+            - "yum_result.changed"
+            - "rpm_result.stdout.startswith('foo-1.0-2')"
+
+    - name: Verify yum module outputs
+      assert:
+        that:
+            - "'msg' in yum_result"
+            - "'rc' in yum_result"
+            - "'results' in yum_result"
+
+    - name: Install foo-1.0-2 again
+      yum:
+        name: foo-1.0-2
+        state: present
+      register: yum_result
+
+    - name: Check foo with rpm
+      shell: rpm -q foo
+      register: rpm_result
+
+    - name: Verify installation
+      assert:
+        that:
+            - "not yum_result.changed"
+            - "rpm_result.stdout.startswith('foo-1.0-2')"
+
+    - name: Verify yum module outputs
+      assert:
+        that:
+            - "'msg' in yum_result"
+            - "'rc' in yum_result"
+            - "'results' in yum_result"
+  always:
+    - name: Clean up
+      yum:
+        name: foo
+        state: absent
+  when: not (ansible_distribution == "Fedora" and ansible_distribution_major_version|int < 26)

test/integration/targets/yum/tasks/yum.yml

@@ -477,6 +477,11 @@
 
 - set_fact:
     pkg_url: https://s3.amazonaws.com/ansible-ci-files/test/integration/targets/yum/fpaste-0.3.7.4.1-2.el7.noarch.rpm
+  when: ansible_python.version.major == 2
+
+- set_fact:
+    pkg_url: https://s3.amazonaws.com/ansible-ci-files/test/integration/targets/yum/fpaste-0.3.9.2-1.fc28.noarch.rpm
+  when: ansible_python.version.major == 3
 # setup end
 
 - name: download an rpm
@@ -566,7 +571,6 @@
     that:
       - "'changed' in no_nevra_info_result"
       - "'msg' in no_nevra_info_result"
-      - "'Failed to get nevra information from RPM package' in no_nevra_info_result.msg"
 
 - name: Delete a temp RPM file
   file:
@@ -583,102 +587,131 @@
     yum_version: "{%- if item.yumstate == 'installed' -%}{{ item.version }}{%- else -%}{{ yum_version }}{%- endif -%}"
   with_items: "{{ yum_version.results }}"
 
-- name: check whether yum supports disableexcludes (>= 3.4)
-  set_fact:
-    supports_disable_excludes: "{{ yum_version is version_compare('3.4.0', '>=') }}"
+- block:
+  - name: check whether yum supports disableexcludes (>= 3.4)
+    set_fact:
+      supports_disable_excludes: "{{ yum_version is version_compare('3.4.0', '>=') }}"
+    when: ansible_pkg_mgr == "yum"
 
-- name: uninstall zip
-  yum: name=zip state=removed
+  - name: unset disableexcludes tests for dnf(yum4) backend temporarily
+    set_fact:
+      supports_disable_excludes: True
+    when: ansible_pkg_mgr == "dnf"
 
-- name: check zip with rpm
-  shell: rpm -q zip
-  ignore_errors: True
-  register: rpm_zip_result
+  - name: uninstall bc
+    yum: name=bc state=removed
 
-- name: verify zip is uninstalled
-  assert:
-    that:
-      - "rpm_zip_result is failed"
+  - name: check bc with rpm
+    shell: rpm -q bc
+    ignore_errors: True
+    register: rpm_bc_result
 
-- name: exclude zip
-  lineinfile:
-    dest: /etc/yum.conf
-    regexp: (^exclude=)(.)*
-    line: "exclude=zip*"
-    state: present
+  - name: verify bc is uninstalled
+    assert:
+      that:
+        - "rpm_bc_result is failed"
 
-# begin test case where disable_excludes is supported
-- name: Try install zip without disable_excludes
-  yum: name=zip state=latest
-  register: yum_zip_result
-  ignore_errors: True
-  when: supports_disable_excludes
+  - name: exclude bc (yum backend)
+    lineinfile:
+      dest: /etc/yum.conf
+      regexp: (^exclude=)(.)*
+      line: "exclude=bc*"
+      state: present
+    when: ansible_pkg_mgr == 'yum'
 
-- name: verify zip did not install because it is in exclude list
-  assert:
-    that:
-      - "yum_zip_result is failed"
-  when: supports_disable_excludes
+  - name: exclude bc (dnf backend)
+    lineinfile:
+      dest: /etc/dnf/dnf.conf
+      regexp: (^excludepkgs=)(.)*
+      line: "excludepkgs=bc*"
+      state: present
+    when: ansible_pkg_mgr == 'dnf'
 
-- name: install zip with disable_excludes
-  yum: name=zip state=latest disable_excludes=all
-  register: yum_zip_result_using_excludes
-  when: supports_disable_excludes
+  # begin test case where disable_excludes is supported
+  - name: Try install bc without disable_excludes
+    yum: name=bc state=latest
+    register: yum_bc_result
+    ignore_errors: True
+    when: supports_disable_excludes
 
-- name: verify zip did install using disable_excludes=all
-  assert:
-    that:
-      - "yum_zip_result_using_excludes is success"
-      - "yum_zip_result_using_excludes is changed"
-      - "yum_zip_result_using_excludes is not failed"
-  when: supports_disable_excludes
+  - name: verify bc did not install because it is in exclude list
+    assert:
+      that:
+        - "yum_bc_result is failed"
+    when: supports_disable_excludes
 
-- name: remove exclude zip (cleanup yum.conf)
-  lineinfile:
-    dest: /etc/yum.conf
-    regexp: (^exclude=zip*)
-    line: "exclude="
-    state: present
-  when: supports_disable_excludes
-# end test case where disable_excludes is supported
+  - name: install bc with disable_excludes
+    yum: name=bc state=latest disable_excludes=all
+    register: yum_bc_result_using_excludes
+    when: supports_disable_excludes
 
-# begin test case where disable_excludes is not supported
-- name: Try install zip with disable_excludes
-  yum: name=zip state=latest disable_excludes=all
-  register: yum_fail_zip_result_old_yum
-  ignore_errors: True
-  when: not supports_disable_excludes
+  - name: verify bc did install using disable_excludes=all
+    assert:
+      that:
+        - "yum_bc_result_using_excludes is success"
+        - "yum_bc_result_using_excludes is changed"
+        - "yum_bc_result_using_excludes is not failed"
+    when: supports_disable_excludes
 
-- name: verify packages did not install because yum version is unsupported
-  assert:
-    that:
-      - "yum_fail_zip_result_old_yum is failed"
-  when: not supports_disable_excludes
+  - name: remove exclude bc (cleanup yum.conf)
+    lineinfile:
+      dest: /etc/yum.conf
+      regexp: (^exclude=bc*)
+      line: "exclude="
+      state: present
+    when: supports_disable_excludes and (ansible_pkg_mgr == 'yum')
 
-- name: verify yum module outputs
-  assert:
-    that:
-        - "'is available in yum version 3.4 and onwards.' in yum_fail_zip_result_old_yum.msg"
-  when: not supports_disable_excludes
+  - name: remove exclude bc (cleanup dnf.conf)
+    lineinfile:
+      dest: /etc/dnf/dnf.conf
+      regexp: (^excludepkgs=bc*)
+      line: "excludepkgs="
+      state: present
+    when: ansible_pkg_mgr == 'dnf'
+  # end test case where disable_excludes is supported
 
-- name: remove exclude zip (cleanup yum.conf)
-  lineinfile:
-    dest: /etc/yum.conf
-    regexp: (^exclude=zip*)
-    line: "exclude="
-    state: present
-  when: not supports_disable_excludes
+  # begin test case where disable_excludes is not supported
+  - name: Try install bc with disable_excludes
+    yum: name=bc state=latest disable_excludes=all
+    register: yum_fail_bc_result_old_yum
+    ignore_errors: True
+    when: not supports_disable_excludes
 
-- name: install zip (bring test env in same state as when testing started)
-  yum: name=zip state=latest
-  register: yum_zip_result_old_yum
-  when: not supports_disable_excludes
+  - name: verify packages did not install because yum version is unsupported
+    assert:
+      that:
+        - "yum_fail_bc_result_old_yum is failed"
+    when: not supports_disable_excludes
 
-- name: verify zip installed
-  assert:
-    that:
-      - "yum_zip_result_old_yum is success"
-      - "yum_zip_result_old_yum is changed"
-      - "yum_zip_result_old_yum is not failed"
-  when: not supports_disable_excludes
-# end test case where disable_excludes is not supported
+  - name: verify yum module outputs
+    assert:
+      that:
+          - "'is available in yum version 3.4 and onwards.' in yum_fail_bc_result_old_yum.msg"
+    when: not supports_disable_excludes
+
+  - name: remove exclude bc (cleanup yum.conf)
+    lineinfile:
+      dest: /etc/yum.conf
+      regexp: (^exclude=bc*)
+      line: "exclude="
+      state: present
+    when: not supports_disable_excludes and ansible_pkg_mgr == 'yum'
+
+  - name: install bc (bring test env in same state as when testing started)
+    yum: name=bc state=latest
+    register: yum_bc_result_old_yum
+    when: not supports_disable_excludes
+
+  - name: verify bc installed
+    assert:
+      that:
+        - "yum_bc_result_old_yum is success"
+        - "yum_bc_result_old_yum is changed"
+        - "yum_bc_result_old_yum is not failed"
+    when: not supports_disable_excludes and ansible_pkg_mgr == "yum"
+  # end test case where disable_excludes is not supported
+
+  # Fedora < 26 has a bug in dnf where package excludes in dnf.conf aren't
+  # actually honored and those releases are EOL'd so we have no expectation they
+  # will ever be fixed
+  when: not ((ansible_distribution == "Fedora") and (ansible_distribution_major_version|int < 26))

test/integration/targets/yum/tasks/yum_group_remove.yml

@@ -5,6 +5,16 @@
   with_items:
     - "@Development Tools"
     - yum-utils
+  when: ansible_pkg_mgr == "yum"
+
+- name: install a group to test and dnf-utils
+  yum:
+    name: "{{ item }}"
+    state: present
+  with_items:
+    - "@Development Tools"
+    - dnf-utils
+  when: ansible_pkg_mgr == "dnf"
 
 - name: check mode remove the group
   yum:

test/integration/targets/yum_repository/tasks/yum_repository_fedora.yml

@@ -36,7 +36,7 @@
   assert:
     that:
       - lib_result.failed
-      - "lib_result.msg=='No package libbdplus available.'"
+      - "lib_result.msg=='Failed to install some of the specified packages'"
 
 - name: re-add rpmfusion
   yum_repository: