python/machine: use subprocess.run instead of subprocess.Popen

use run() instead of Popen() -- to assert to pylint that we are not
forgetting to close a long-running program.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Tested-by: Cleber Rosa <crosa@redhat.com>
Message-id: 20210527211715.394144-4-jsnow@redhat.com
Message-id: 20210517184808.3562549-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

python/qemu/machine.py

@@ -223,13 +223,16 @@ def send_fd_scm(self, fd: Optional[int] = None,
             assert fd is not None
             fd_param.append(str(fd))
 
-        proc = subprocess.Popen(
-            fd_param, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE,
-            stderr=subprocess.STDOUT, close_fds=False
+        proc = subprocess.run(
+            fd_param,
+            stdin=subprocess.DEVNULL,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            check=False,
+            close_fds=False,
         )
-        output = proc.communicate()[0]
-        if output:
-            LOG.debug(output)
+        if proc.stdout:
+            LOG.debug(proc.stdout)
 
         return proc.returncode