Introduce oscapd-evaluate config, this generates default oscapd config

Will help when injecting it into SPC containers.

bin/oscapd-evaluate

@@ -45,6 +45,17 @@ def main():
     subparsers = parser.add_subparsers(dest="action")
     subparsers.required = True
 
+    config_parser = subparsers.add_parser(
+        "config",
+        help="Start with default configuration, auto-detect tool and content "
+             "locations and output the resulting INI results into stdout or "
+             "given file path"
+    )
+    config_parser.add_argument(
+        "--path", metavar="PATH", type=argparse.FileType("w"),
+        default=sys.stdout
+    )
+
     xml_parser = subparsers.add_parser(
         "xml",
         help="Evaluate an EvaluationSpec passed as an XML, either to stdin or "
@@ -112,6 +123,13 @@ def main():
                         level=logging.DEBUG if args.verbose else logging.INFO)
     logging.info("OpenSCAP Daemon one-off evaluator %s", version.VERSION_STRING)
 
+    if args.action == "config":
+        config = config_.Configuration()
+        config.autodetect_tool_paths()
+        config.autodetect_content_paths()
+        config.save_as(args.path)
+        sys.exit(0)
+
     config_file = os.path.join("/", "etc", "oscapd", "config.ini")
     if "OSCAPD_CONFIG_FILE" in os.environ:
         config_file = os.environ["OSCAPD_CONFIG_FILE"]

openscap_daemon/config.py

@@ -273,10 +273,16 @@ def save_as(self, config_file):
         config.set("CVEScanner", "fetch-cve", "yes" if self.fetch_cve else "no")
         config.set("CVEScanner", "fetch-cve-url", str(self.fetch_cve_url))
 
-        with open(config_file, "w") as f:
-            config.write(f)
+        if hasattr(config_file, "write"):
+            # config_file is an already opened file, let's use it like one
+            config.write(config_file)
 
-        self.config_file = config_file
+        else:
+            # treat config_file as a path
+            with open(config_file, "w") as f:
+                config.write(f)
+
+            self.config_file = config_file
 
     def save(self):
         self.save_as(self.config_file)