4 files changed, 44 insertions, 5 deletions
diff --git a/kvmd/plugins/msd/__init__.py b/kvmd/plugins/msd/__init__.py
index 31095f3c..ac285f7b 100644
--- a/kvmd/plugins/msd/__init__.py
+++ b/kvmd/plugins/msd/__init__.py
@@ -93,7 +93,12 @@ class MsdMultiNotSupported(MsdOperationError):
 
 class MsdCdromNotSupported(MsdOperationError):
     def __init__(self) -> None:
-        super().__init__("This MSD does not support CD-ROM emulation")
+        super().__init__("This MSD does not support CD-ROM switching")
+
+
+class MsdRwNotSupported(MsdOperationError):
+    def __init__(self) -> None:
+        super().__init__("This MSD does not support RW switching")
 
 
 # =====
@@ -114,7 +119,13 @@ class BaseMsd(BasePlugin):
 
     # =====
 
-    async def set_params(self, name: Optional[str]=None, cdrom: Optional[bool]=None) -> None:
+    async def set_params(
+        self,
+        name: Optional[str]=None,
+        cdrom: Optional[bool]=None,
+        rw: Optional[bool]=None,
+    ) -> None:
+
         raise NotImplementedError()
 
     async def set_connected(self, connected: bool) -> None:
diff --git a/kvmd/plugins/msd/disabled.py b/kvmd/plugins/msd/disabled.py
index 0545b86b..13def45e 100644
--- a/kvmd/plugins/msd/disabled.py
+++ b/kvmd/plugins/msd/disabled.py
@@ -50,6 +50,7 @@ class Plugin(BaseMsd):
             "features": {
                 "multi": False,
                 "cdrom": False,
+                "rw": False,
             },
         }
 
@@ -63,7 +64,13 @@ class Plugin(BaseMsd):
 
     # =====
 
-    async def set_params(self, name: Optional[str]=None, cdrom: Optional[bool]=None) -> None:
+    async def set_params(
+        self,
+        name: Optional[str]=None,
+        cdrom: Optional[bool]=None,
+        rw: Optional[bool]=None,
+    ) -> None:
+
         raise MsdDisabledError()
 
     async def set_connected(self, connected: bool) -> None:
diff --git a/kvmd/plugins/msd/otg/__init__.py b/kvmd/plugins/msd/otg/__init__.py
index 409b899a..8aea3d34 100644
--- a/kvmd/plugins/msd/otg/__init__.py
+++ b/kvmd/plugins/msd/otg/__init__.py
@@ -56,6 +56,7 @@ from .. import MsdDisconnectedError
 from .. import MsdImageNotSelected
 from .. import MsdUnknownImageError
 from .. import MsdImageExistsError
+from .. import MsdRwNotSupported
 from .. import BaseMsd
 from .. import MsdImageWriter
 
@@ -222,6 +223,7 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
                 "features": {
                     "multi": True,
                     "cdrom": True,
+                    "rw": False,
                 },
             }
 
@@ -254,8 +256,17 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
     # =====
 
     @aiotools.atomic
-    async def set_params(self, name: Optional[str]=None, cdrom: Optional[bool]=None) -> None:
+    async def set_params(
+        self,
+        name: Optional[str]=None,
+        cdrom: Optional[bool]=None,
+        rw: Optional[bool]=None,
+    ) -> None:
+
         async with self.__state.busy():
+            if rw is not None:
+                raise MsdRwNotSupported()
+
             assert self.__state.storage
             assert self.__state.vd
 
diff --git a/kvmd/plugins/msd/relay/__init__.py b/kvmd/plugins/msd/relay/__init__.py
index 3c17a1ff..125f5fb9 100644
--- a/kvmd/plugins/msd/relay/__init__.py
+++ b/kvmd/plugins/msd/relay/__init__.py
@@ -49,6 +49,7 @@ from .. import MsdConnectedError
 from .. import MsdDisconnectedError
 from .. import MsdMultiNotSupported
 from .. import MsdCdromNotSupported
+from .. import MsdRwNotSupported
 from .. import BaseMsd
 from .. import MsdImageWriter
 
@@ -141,6 +142,7 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
             "features": {
                 "multi": False,
                 "cdrom": False,
+                "rw": False,
             },
         }
 
@@ -178,12 +180,20 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
     # =====
 
     @aiotools.atomic
-    async def set_params(self, name: Optional[str]=None, cdrom: Optional[bool]=None) -> None:
+    async def set_params(
+        self,
+        name: Optional[str]=None,
+        cdrom: Optional[bool]=None,
+        rw: Optional[bool]=None,
+    ) -> None:
+
         async with self.__working():
             if name is not None:
                 raise MsdMultiNotSupported()
             if cdrom is not None:
                 raise MsdCdromNotSupported()
+            if rw is not None:
+                raise MsdRwNotSupported()
 
     @aiotools.atomic
     async def set_connected(self, connected: bool) -> None: