generate-all-test-cases: add manifests command

Add `manifests` command for generating image test cases without
`image-info` report, so only manifests.

Signed-off-by: Tomas Hozza <thozza@redhat.com>

tools/test-case-generators/generate-all-test-cases

@@ -1259,6 +1259,65 @@ class RemoteTestCaseMatrixGenerator(BaseTestCaseMatrixGenerator):
             generator.generate()
 
 
+@register_generator_cls
+class ManifestTestCaseMatrixGenerator(BaseTestCaseMatrixGenerator):
+    """
+    Class representing generation of all test case manifests based on provided test
+    cases matrix locally.
+    """
+
+    arch_runner_map = {
+        "x86_64": True,
+        "aarch64": True,
+        "ppc64le": True,
+        "s390x": True
+    }
+
+    def __init__(self, arch_gen_matrix, sources, output, repos, keep_workdir, log_level=logging.INFO):
+        """
+        Constructor
+        """
+        super().__init__(arch_gen_matrix=arch_gen_matrix, sources=sources, output=output, ssh_id_file="/dev/null",
+            repos=repos, build_rpms=False, keep_workdir=keep_workdir, log_level=log_level)
+
+    def generate(self):
+        """
+        Generates all test cases based on provided data in a blocking manner.
+        """
+        for arch_name, distros in self.arch_gen_matrix.items():
+            for distro_name, image_types in distros.items():
+                for image_type in image_types:
+                    script_dir = os.path.dirname(__file__)
+                    log.info("Generating manifest for %s-%s-%s", distro_name, arch_name, image_type)
+                    try:
+                        subprocess.check_call([f"{script_dir}/generate-test-cases", "--distro", f"{distro_name}", "--arch",
+                            f"{arch_name}", "--image-types", f"{image_type}", "--store", "/dev/null", "--output", f"{self.output}",
+                            "--keep-image-info"], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                    except subprocess.CalledProcessError as e:
+                        log.error("Generating manifest for %s-%s-%s FAILED: %s", distro_name, arch_name, image_type, e)
+
+    @staticmethod
+    def add_subparser(subparsers):
+        """
+        Adds subparser for the 'manifests' command
+        """
+        parser_remote = subparsers.add_parser(
+            "manifests",
+            description="locally generate test case manifests only",
+            help="locally generate test case manifests only"
+        )
+        parser_remote.set_defaults(func=ManifestTestCaseMatrixGenerator.main)
+
+    @staticmethod
+    def main(arch_gen_matrix_dict, sources, output, ssh_id_file, repos, build_rpms, keep_workdir, parser_args):
+        """
+        The main function of the 'manifests' command
+        """
+        with ManifestTestCaseMatrixGenerator(
+            arch_gen_matrix_dict, sources, output, repos, log.level) as generator:
+            generator.generate()
+
+
 def get_default_ssh_id_file():
     """
     Returns the path of the default SSH ID file to use.