Implement replacing repositories

There is no way to remove a repository from the RepoSack without dropping
the entire Base. Therefore, a repository can be only configured again,
but not replaced. Since it cannot be removed, the test for repository
removal was removed as well.

pyanaconda/modules/payloads/payload/dnf/dnf_manager.py

@@ -810,33 +810,29 @@ def add_repository(self, data: RepoConfigurationData):
 
         :param RepoConfigurationData data: a repo configuration
         """
+        repositories = libdnf5.repo.RepoQuery(self._base)
+        repositories.filter_id(data.name)
 
         with self._lock:
-            # Create a new repository.
-            repo = self._create_repository(data)
-
-            # FIXME: How to handle existing repositories?
-            # Remove an existing repository.
-            #
-            # if repo.id in self._base.repos:
-            #    self._base.repos.pop(repo.id)
-
-            # Add the new repository.
-            #self._base.repos.add(repo)
+            if repositories.empty():
+                # Create a new repository.
+                repo = self._create_repository(data)
+            else:
+                # Replace the existing repository with a new one.
+                repo = self._configure_repository(repositories.get(), data)
 
         log.info("Added the '%s' repository: %s", repo.get_id(), repo)
 
-    def _create_repository(self, data: RepoConfigurationData):
-        """Create a DNF repository.
+    def _configure_repository(self, repo: libdnf5.repo.Repo, data: RepoConfigurationData):
+        """Configure a DNF repository.
 
+        :param libdnf5.repo.Repo repo:existing repository
         :param RepoConfigurationData data: a repo configuration
-        return dnf.repo.Repo: a DNF repository
+        return libdnf5.repo.Repo: a DNF repository
         """
         if self._repositories_loaded:
             raise RuntimeError("Cannot create a new repository. Repositories were already loaded.")
 
-        repo_sack = self._base.get_repo_sack()
-        repo = repo_sack.create_repo(data.name)
         config = repo.get_config()
 
         # Disable the repo if requested.
@@ -887,6 +883,19 @@ def _create_repository(self, data: RepoConfigurationData):
 
         return repo
 
+    def _create_repository(self, data: RepoConfigurationData):
+        """Create a DNF repository.
+
+        :param RepoConfigurationData data: a repo configuration
+        return libdnf5.repo.Repo: a DNF repository
+        """
+        if self._repositories_loaded:
+            raise RuntimeError("Cannot create a new repository. Repositories were already loaded.")
+
+        repo = self._base.get_repo_sack().create_repo(data.name)
+
+        return self._configure_repository(repo, data)
+
     def generate_repo_file(self, data: RepoConfigurationData):
         """Generate a content of the .repo file.
 

tests/unit_tests/pyanaconda_tests/modules/payloads/payload/test_module_payload_dnf5_manager.py

@@ -861,7 +861,6 @@ def test_add_repository_packages(self):
         assert config.includepkgs == ("p1", "p2")
         assert config.excludepkgs == ("p3", "p4")
 
-    @pytest.mark.skip("Not implemented")
     def test_add_repository_replace(self):
         """Test the add_repository method with a replacement."""
         data = RepoConfigurationData()
@@ -878,25 +877,6 @@ def test_add_repository_replace(self):
         config = self._get_configuration("r1")
         assert config.baseurl == ("http://u2",)
 
-    @pytest.mark.skip("Not implemented")
-    def test_remove_repository(self):
-        """Test the remove_repository method."""
-        assert self.dnf_manager.repositories == []
-
-        self._add_repository("r1")
-        self._add_repository("r2")
-
-        assert self.dnf_manager.repositories == ["r1", "r2"]
-
-        self.dnf_manager.remove_repository("r1")
-        assert self.dnf_manager.repositories == ["r2"]
-
-        self.dnf_manager.remove_repository("r3")
-        assert self.dnf_manager.repositories == ["r2"]
-
-        self.dnf_manager.remove_repository("r2")
-        assert self.dnf_manager.repositories == []
-
     def test_generate_repo_file_baseurl(self):
         """Test the generate_repo_file method with baseurl."""
         data = RepoConfigurationData()