core: kraken: Add check for space prior to install

* Add free space check in kraken prior to install extension

core/services/kraken/kraken.py

@@ -346,5 +346,13 @@ async def load_stats(self) -> Dict[str, Any]:
             }
         return result
 
+    def has_enough_disk_space(self, path: str = "/", required_mb: int = 2**10) -> bool:
+        try:
+            free_space = psutil.disk_usage(path).free
+            # Right now only check if there is 1GB of free space as a hardcoded value
+            return bool(free_space > required_mb * 2**20)
+        except FileNotFoundError:
+            return False
+
     async def stop(self) -> None:
         self.should_run = False

core/services/kraken/main.py

@@ -78,6 +78,11 @@ async def install_extension(extension: Extension) -> Any:
             status_code=status.HTTP_400_BAD_REQUEST,
             detail="Invalid extension description",
         )
+    if not kraken.has_enough_disk_space():
+        raise HTTPException(
+            status_code=status.HTTP_507_INSUFFICIENT_STORAGE,
+            detail="Not enough disk space to install the extension",
+        )
     return StreamingResponse(kraken.install_extension(extension))