Fix container and add dry run ability.

Containerfile

@@ -1,4 +1,4 @@
 FROM debian
 
-COPY machine_admin /
+COPY machine_admin /machine_admin
 COPY machine_setup.py /

machine_admin/util.py

@@ -1,4 +1,13 @@
 import subprocess
+import logging
+
+_DRY_RUN = False
+
+def set_is_dry_run(is_dry_run: bool):
+    _DRY_RUN = is_dry_run
 
 def run_op(op: str):
-    return subprocess.run(op, shell=True) 
+    if _DRY_RUN:
+        return subprocess.run(op, shell=True) 
+    else:
+        logging.info(f"Dry Run | {op}")

machine_setup.py

@@ -12,6 +12,9 @@ if __name__ == "__main__":
 
     parser.add_argument('--username', 
         help="Name of the default non-root user")
+    parser.add_argument('--dry_run', 
+        help="If set then don't change the system state - used for testing.",
+        default = False)
 
     args = parser.parse_args()