Merge pull request #6564 from liang-cong-red-hat/domjobinfo_fix_job_stuck_pipe_error_3

virsh_domjobinfo: fix pipe file read stuck when background virsh cmd failed

Author: cliping

libvirt/tests/src/virsh_cmd/domain/virsh_domjobinfo.py

@@ -150,6 +150,14 @@ def cmp_jobinfo(result, info_list, job_type, actions):
         else:
             process = get_subprocess(action, vm_name, tmp_pipe, None)
 
+        try:
+            _, stderr = process.communicate(timeout=6)
+            if process.returncode:
+                os.unlink(tmp_pipe)
+                test.error('Background cmd met unexpected failure of %s, abort the test.' % stderr)
+        except subprocess.TimeoutExpired:
+            logging.debug("Background cmd is still running.")
+
         f = open(tmp_pipe, 'rb')
         dummy = f.read(1024 * 1024).decode(locale.getpreferredencoding(), 'ignore')