feat: Pull and rebase before push

Resolves #229

If another user pushes changes to the remote repo after gitopscli has cloned it,
the subsequent push will fail. Alliviate this problem by pulling and rebasing
local changes on top of any remote changes just before pushing.:

For the case of creating a new branch (for a PR), the pull is skipped because
it would fail due to the missing remote branch.

gitopscli/commands/create_preview.py

@@ -101,6 +101,7 @@ def __commit_and_push(self, git_repo: GitRepo, message: str) -> None:
             self.__args.git_author_email,
             message,
         )
+        git_repo.pull_rebase()
         git_repo.push()
 
     def __get_gitops_config(self) -> GitOpsConfig:

gitopscli/commands/delete_preview.py

@@ -74,6 +74,7 @@ def __commit_and_push(self, git_repo: GitRepo, message: str) -> None:
             self.__args.git_author_email,
             message,
         )
+        git_repo.pull_rebase()
         git_repo.push()
 
     @staticmethod

gitopscli/commands/deploy.py

@@ -55,6 +55,7 @@ def execute(self) -> None:
                 logging.info("All values already up-to-date. I'm done here.")
                 return
 
+            git_repo.pull_rebase()
             git_repo.push()
 
         if self.__args.create_pr:

gitopscli/commands/sync_apps.py

@@ -103,4 +103,5 @@ def __commit_and_push(
         git_author_email,
         f"{author} updated " + app_file_name,
     )
+    root_config_git_repo.pull_rebase()
     root_config_git_repo.push()

gitopscli/git_api/git_repo.py

@@ -105,6 +105,14 @@ def __validate_git_author(self, name: str | None, email: str | None) -> None:
         if (name and not email) or (not name and email):
             raise GitOpsException("Please provide the name and email address of the Git author or provide neither!")
 
+    def pull_rebase(self) -> None:
+        repo = self.__get_repo()
+        branch = repo.git.branch("--show-current")
+        if not self.__remote_branch_exists(branch):
+            return
+        logging.info("Pull and rebase: %s", branch)
+        repo.git.pull("--rebase")
+
     def push(self, branch: str | None = None) -> None:
         repo = self.__get_repo()
         if not branch:
@@ -122,6 +130,10 @@ def get_author_from_last_commit(self) -> str:
         last_commit = repo.head.commit
         return str(repo.git.show("-s", "--format=%an <%ae>", last_commit.hexsha))
 
+    def __remote_branch_exists(self, branch: str) -> bool:
+        repo = self.__get_repo()
+        return bool(repo.git.ls_remote("--heads", "origin", f"refs/heads/{branch}").strip() != "")
+
     def __delete_tmp_dir(self) -> None:
         if self.__tmp_dir:
             delete_tmp_dir(self.__tmp_dir)

tests/commands/test_create_preview.py

@@ -107,6 +107,7 @@ def git_repo_api_factory_create_mock(_: GitApiConfig, organisation: str, reposit
         self.template_git_repo_mock.get_full_file_path.side_effect = lambda x: f"/tmp/template-repo/{x}"
         self.template_git_repo_mock.clone.return_value = None
         self.template_git_repo_mock.commit.return_value = None
+        self.template_git_repo_mock.pull_rebase.return_value = None
         self.template_git_repo_mock.push.return_value = None
 
         self.target_git_repo_mock = self.create_mock(GitRepo)
@@ -208,6 +209,7 @@ def test_create_new_preview(self):
                 "GIT_AUTHOR_EMAIL",
                 "Create new preview environment for 'my-app' and git hash '3361723dbd91fcfae7b5b8b8b7d462fbc14187a9'.",
             ),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 
@@ -312,6 +314,7 @@ def test_create_new_preview_from_same_template_target_repo(self):
                 "GIT_AUTHOR_EMAIL",
                 "Create new preview environment for 'my-app' and git hash '3361723dbd91fcfae7b5b8b8b7d462fbc14187a9'.",
             ),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 
@@ -381,6 +384,7 @@ def test_update_existing_preview(self):
                 "GIT_AUTHOR_EMAIL",
                 "Update preview environment for 'my-app' and git hash '3361723dbd91fcfae7b5b8b8b7d462fbc14187a9'.",
             ),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 

tests/commands/test_delete_preview.py

@@ -63,6 +63,7 @@ def setUp(self):
         self.git_repo_mock.get_full_file_path.side_effect = lambda x: f"/tmp/created-tmp-dir/{x}"
         self.git_repo_mock.clone.return_value = None
         self.git_repo_mock.commit.return_value = None
+        self.git_repo_mock.pull_rebase.return_value = None
         self.git_repo_mock.push.return_value = None
 
         self.seal_mocks()
@@ -100,6 +101,7 @@ def test_delete_existing_happy_flow(self):
                 "GIT_AUTHOR_EMAIL",
                 "Delete preview environment for 'APP' and preview id 'PREVIEW_ID'.",
             ),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 

tests/commands/test_deploy.py

@@ -48,6 +48,7 @@ def setUp(self):
         self.git_repo_mock.new_branch.return_value = None
         self.example_commit_hash = "5f3a443e7ecb3723c1a71b9744e2993c0b6dfc00"
         self.git_repo_mock.commit.return_value = self.example_commit_hash
+        self.git_repo_mock.pull_rebase.return_value = None
         self.git_repo_mock.push.return_value = None
         self.git_repo_mock.get_full_file_path.side_effect = lambda x: f"/tmp/created-tmp-dir/{x}"
 
@@ -101,6 +102,7 @@ def test_happy_flow(self, mock_print):
                 "GIT_AUTHOR_EMAIL",
                 "changed 'a.b.d' to 'bar' in test/file.yml",
             ),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 
@@ -142,6 +144,7 @@ def test_create_pr_single_value_change_happy_flow_with_output(self, mock_print):
             call.update_yaml_file("/tmp/created-tmp-dir/test/file.yml", "a.b.c", "foo"),
             call.logging.info("Updated yaml property %s to %s", "a.b.c", "foo"),
             call.GitRepo.commit("GIT_USER", "GIT_EMAIL", None, None, "changed 'a.b.c' to 'foo' in test/file.yml"),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
             call.GitRepoApi.create_pull_request_to_default_branch(
                 "gitopscli-deploy-b973b5bb",
@@ -199,6 +202,7 @@ def test_create_pr_multiple_value_changes_happy_flow_with_output(self, mock_prin
             call.update_yaml_file("/tmp/created-tmp-dir/test/file.yml", "a.b.d", "bar"),
             call.logging.info("Updated yaml property %s to %s", "a.b.d", "bar"),
             call.GitRepo.commit("GIT_USER", "GIT_EMAIL", None, None, "changed 'a.b.d' to 'bar' in test/file.yml"),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
             call.GitRepoApi.create_pull_request_to_default_branch(
                 "gitopscli-deploy-b973b5bb",
@@ -259,6 +263,7 @@ def test_create_pr_and_merge_happy_flow(self, mock_print):
             call.update_yaml_file("/tmp/created-tmp-dir/test/file.yml", "a.b.d", "bar"),
             call.logging.info("Updated yaml property %s to %s", "a.b.d", "bar"),
             call.GitRepo.commit("GIT_USER", "GIT_EMAIL", None, None, "changed 'a.b.d' to 'bar' in test/file.yml"),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
             call.GitRepoApi.create_pull_request_to_default_branch(
                 "gitopscli-deploy-b973b5bb",
@@ -313,6 +318,7 @@ def test_single_commit_happy_flow(self, mock_print):
                 None,
                 "updated 2 values in test/file.yml\n\na.b.c: foo\na.b.d: bar",
             ),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 
@@ -352,6 +358,7 @@ def test_single_commit_single_value_change_happy_flow(self, mock_print):
             call.update_yaml_file("/tmp/created-tmp-dir/test/file.yml", "a.b.c", "foo"),
             call.logging.info("Updated yaml property %s to %s", "a.b.c", "foo"),
             call.GitRepo.commit("GIT_USER", "GIT_EMAIL", None, None, "changed 'a.b.c' to 'foo' in test/file.yml"),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 
@@ -393,6 +400,7 @@ def test_commit_message_multiple_value_changes_happy_flow(self, mock_print):
             call.update_yaml_file("/tmp/created-tmp-dir/test/file.yml", "a.b.d", "bar"),
             call.logging.info("Updated yaml property %s to %s", "a.b.d", "bar"),
             call.GitRepo.commit("GIT_USER", "GIT_EMAIL", None, None, "testcommit"),
+            call.GitRepo.pull_rebase(),
             call.GitRepo.push(),
         ]
 

tests/commands/test_sync_apps.py

@@ -73,6 +73,7 @@ def setUp(self):
         self.root_config_git_repo_mock.get_clone_url.return_value = "https://repository.url/root/root-config.git"
         self.root_config_git_repo_mock.clone.return_value = None
         self.root_config_git_repo_mock.commit.return_value = None
+        self.root_config_git_repo_mock.pull_rebase.return_value = None
         self.root_config_git_repo_mock.push.return_value = None
 
         self.git_repo_api_factory_mock = self.monkey_patch(GitRepoApiFactory)
@@ -166,6 +167,7 @@ def test_sync_apps_happy_flow(self):
                 "GIT_AUTHOR_EMAIL",
                 "author updated /tmp/root-config-repo/apps/team-non-prod.yaml",
             ),
+            call.GitRepo_root.pull_rebase(),
             call.GitRepo_root.push(),
             call.GitRepo_root.__exit__(None, None, None),
             call.GitRepo_team.__exit__(None, None, None),

tests/git_api/test_git_repo.py

@@ -49,7 +49,7 @@ def __create_origin(self):
         with Path(f"{repo_dir}/README.md").open("w") as readme:
             readme.write("xyz branch readme")
         repo.git.add("--all")
-        repo.git.commit("-m", "xyz brach commit", "--author", f"{git_user} <{git_email}>")
+        repo.git.commit("-m", "initial xyz branch commit", "--author", f"{git_user} <{git_email}>")
 
         repo.git.checkout("master")  # master = default branch
         repo.git.config("receive.denyCurrentBranch", "ignore")
@@ -313,6 +313,102 @@ def test_commit_nothing_to_commit(self, logging_mock):
             self.assertEqual("initial commit\n", commits[0].message)
         logging_mock.assert_not_called()
 
+    @patch("gitopscli.git_api.git_repo.logging")
+    def test_pull_rebase_master_single_commit(self, logging_mock):
+        origin_repo = self.__origin
+        with GitRepo(self.__mock_repo_api) as testee:
+            testee.clone()
+
+            # local commit
+            with Path(testee.get_full_file_path("local.md")).open("w") as outfile:
+                outfile.write("local file")
+            local_repo = Repo(testee.get_full_file_path("."))
+            local_repo.git.add("--all")
+            local_repo.git.commit("-m", "local commit", "--author", "local <[email protected]>")
+
+            # origin commit
+            with Path(f"{origin_repo.working_dir}/origin.md").open("w") as readme:
+                readme.write("origin file")
+            origin_repo.git.add("--all")
+            origin_repo.git.commit("-m", "origin commit", "--author", "origin <[email protected]>")
+
+            # pull and rebase from remote
+            logging_mock.reset_mock()
+
+            testee.pull_rebase()
+
+            logging_mock.info.assert_called_once_with("Pull and rebase: %s", "master")
+
+            # then push should work
+            testee.push()
+
+            commits = list(self.__origin.iter_commits("master"))
+            self.assertEqual(3, len(commits))
+            self.assertEqual("initial commit\n", commits[2].message)
+            self.assertEqual("origin commit\n", commits[1].message)
+            self.assertEqual("local commit\n", commits[0].message)
+
+    @patch("gitopscli.git_api.git_repo.logging")
+    def test_pull_rebase_remote_branch_single_commit(self, logging_mock):
+        origin_repo = self.__origin
+        origin_repo.git.checkout("xyz")
+        with GitRepo(self.__mock_repo_api) as testee:
+            testee.clone(branch="xyz")
+
+            # local commit
+            with Path(testee.get_full_file_path("local.md")).open("w") as outfile:
+                outfile.write("local file")
+            local_repo = Repo(testee.get_full_file_path("."))
+            local_repo.git.add("--all")
+            local_repo.git.commit("-m", "local branch commit", "--author", "local <[email protected]>")
+
+            # origin commit
+            with Path(f"{origin_repo.working_dir}/origin.md").open("w") as readme:
+                readme.write("origin file")
+            origin_repo.git.add("--all")
+            origin_repo.git.commit("-m", "origin branch commit", "--author", "origin <[email protected]>")
+
+            # pull and rebase from remote
+            logging_mock.reset_mock()
+
+            testee.pull_rebase()
+
+            logging_mock.info.assert_called_once_with("Pull and rebase: %s", "xyz")
+
+            # then push should work
+            testee.push()
+
+            commits = list(self.__origin.iter_commits("xyz"))
+            self.assertEqual(4, len(commits))
+            self.assertEqual("local branch commit\n", commits[0].message)
+            self.assertEqual("origin branch commit\n", commits[1].message)
+            self.assertEqual("initial xyz branch commit\n", commits[2].message)
+
+    @patch("gitopscli.git_api.git_repo.logging")
+    def test_pull_rebase_without_new_commits(self, logging_mock):
+        with GitRepo(self.__mock_repo_api) as testee:
+            testee.clone()
+
+            # pull and rebase from remote
+            logging_mock.reset_mock()
+
+            testee.pull_rebase()
+
+            logging_mock.info.assert_called_once_with("Pull and rebase: %s", "master")
+
+    @patch("gitopscli.git_api.git_repo.logging")
+    def test_pull_rebase_if_no_remote_branch_is_noop(self, logging_mock):
+        with GitRepo(self.__mock_repo_api) as testee:
+            testee.clone()
+            testee.new_branch("new-branch-only-local")
+
+            # pull and rebase from remote
+            logging_mock.reset_mock()
+
+            testee.pull_rebase()
+
+            logging_mock.assert_not_called()
+
     @patch("gitopscli.git_api.git_repo.logging")
     def test_push(self, logging_mock):
         with GitRepo(self.__mock_repo_api) as testee: