CLI: Partial changes by @lesander contributed in #1343

.github/workflows/test.yaml

@@ -41,8 +41,8 @@ jobs:
 
     - name: Testing...
       run: |
-        py.test ./test/test_volatility.py --volatility=vol.py --image win-xp-laptop-2005-06-25.img -k test_windows -v
-        py.test ./test/test_volatility.py --volatility=vol.py --image linux-sample-1.bin -k test_linux -v
+        pytest ./test/test_volatility.py --volatility=vol.py --image win-xp-laptop-2005-06-25.img -k test_windows -v
+        pytest ./test/test_volatility.py --volatility=vol.py --image linux-sample-1.bin -k test_linux -v
 
     - name: Clean up post-test
       run: |

volatility3/cli/__init__.py

@@ -88,7 +88,7 @@ class MuteProgress(PrintedProgress):
 class CommandLine:
     """Constructs a command-line interface object for users to run plugins."""
 
-    CLI_NAME = "volatility"
+    CLI_NAME = os.path.basename(sys.argv[0]) # vol or volatility
 
     def __init__(self):
         self.setup_logging()
@@ -364,6 +364,7 @@ class CommandLine:
                 self.CLI_NAME
             ),
             action=volargparse.HelpfulSubparserAction,
+            metavar="PLUGIN",
         )
         for plugin in sorted(plugin_list):
             plugin_parser = subparser.add_parser(
@@ -385,7 +386,7 @@ class CommandLine:
             argcomplete.autocomplete(parser)
         args = parser.parse_args()
         if args.plugin is None:
-            parser.error("Please select a plugin to run")
+            parser.error(f"Please select a plugin to run (see '{self.CLI_NAME} --help' for options")
 
         vollog.log(
             constants.LOGLEVEL_VVV, f"Cache directory used: {constants.CACHE_PATH}"

volatility3/cli/volshell/__init__.py

@@ -49,7 +49,7 @@ class VolShell(cli.CommandLine):
     python terminal with all the volatility support calls available.
     """
 
-    CLI_NAME = "volshell"
+    CLI_NAME = os.path.basename(sys.argv[0]) # volshell
 
     def __init__(self):
         super().__init__()