Redirect qvm-run stdin to the open fd /dev/null

Author: ben-grande

qubes/tests/integ/dispvm.py

@@ -280,9 +280,13 @@ async def wait_preload(
 
     async def run_preload_proc(self):
         logger.info("start")
+        # TODO: ben: to marek: DEVNULL may work because differently than None,
+        # it is not a closed fd.
         proc = await asyncio.create_subprocess_exec(
             *self.preload_cmd,
             stdout=asyncio.subprocess.PIPE,
+            #stdin=asyncio.subprocess.PIPE,
+            stdin=asyncio.subprocess.DEVNULL,
         )
         try:
             stdout, _ = await asyncio.wait_for(proc.communicate(), timeout=60)