Better handling of rootfs default

qiling/core.py

@@ -30,7 +30,7 @@ class Qiling(QlCoreHooks, QlCoreStructs):
     def __init__(
             self,
             argv: Sequence[str] = None,
-            rootfs: str = None,
+            rootfs: str = r'.',
             env: MutableMapping[AnyStr, AnyStr] = {},
             code: bytes = None,
             ostype: Union[str, QL_OS] = None,
@@ -100,10 +100,7 @@ class Qiling(QlCoreHooks, QlCoreStructs):
         ################
         # rootfs setup #
         ################
-        if rootfs is None:
-            rootfs = '.'
-
-        elif not os.path.exists(rootfs):
+        if not os.path.exists(rootfs):
             raise QlErrorFileNotFound(f'Target rootfs not found: "{rootfs}"')
 
         self._rootfs = rootfs

qltool

@@ -187,7 +187,7 @@ if __name__ == '__main__':
     code_parser.add_argument('--thumb', action='store_true', help='specify thumb mode for ARM')
     code_parser.add_argument('--endian', choices=('little', 'big'), default='little', help='specify endianess for bi-endian archs')
     code_parser.add_argument('--os', required=True, choices=os_map)
-    code_parser.add_argument('--rootfs', help='emulated root filesystem, that is where all libraries reside')
+    code_parser.add_argument('--rootfs', default='.', help='emulated root filesystem, that is where all libraries reside')
     code_parser.add_argument('--format', choices=('asm', 'hex', 'bin'), default='bin', help='input file format')
 
     # set "examples" subcommand
@@ -223,7 +223,7 @@ if __name__ == '__main__':
         handle_examples(parser)
 
     # ql file setup
-    if options.subcommand == 'run':
+    elif options.subcommand == 'run':
         ql = handle_run(options)
 
     # ql code setup