handle another PermissionError

Author: mr-c

cwltool/job.py

@@ -718,12 +718,16 @@ def docker_monitor(self, cidfile, tmpdir_prefix, cleanup_cidfile, process):
         max_mem = psutil.virtual_memory().total
         tmp_dir, tmp_prefix = os.path.split(tmpdir_prefix)
         stats_file = tempfile.NamedTemporaryFile(prefix=tmp_prefix, dir=tmp_dir)
-        with open(stats_file.name, mode="w") as stats_file_handle:
-            stats_proc = subprocess.Popen(
-                ['docker', 'stats', '--no-trunc', '--format', '{{.MemPerc}}',
-                 cid], stdout=stats_file_handle, stderr=subprocess.DEVNULL)
-            process.wait()
-            stats_proc.kill()
+        try:
+            with open(stats_file.name, mode="w") as stats_file_handle:
+                stats_proc = subprocess.Popen(
+                    ['docker', 'stats', '--no-trunc', '--format', '{{.MemPerc}}',
+                     cid], stdout=stats_file_handle, stderr=subprocess.DEVNULL)
+                process.wait()
+                stats_proc.kill()
+        except PermissionError as exc:
+            _logger.warn("Ignored error with docker stats: %s", exc)
+            return
         max_mem_percent = 0
         with open(stats_file.name, mode="r") as stats:
             for line in stats: