Close stringio objects at sshutils

Closes-Bug: #1956956
Change-Id: I94f597d99951459b12f0f0211ec73f2ae7fa908d

CHANGELOG.rst

@@ -17,6 +17,16 @@ Changelog
 .. Release notes for existing releases are MUTABLE! If there is something that
    was missed or can be improved, feel free to change it!
 
+[unreleased]
+------------
+
+Fixed
+~~~~~
+
+* rally.utils.sshutils.SSH.execute leaves fifo files.
+
+  `Launchpad-bug #1956956 <https://launchpad.net/bugs/1956956>`_
+
 [3.3.0] - 2021-06-16
 --------------------
 

rally/utils/sshutils.py

@@ -24,7 +24,7 @@ Execute command and get output:
     status, stdout, stderr = ssh.execute("ps ax")
     if status:
         raise Exception("Command failed with non-zero status.")
-    print stdout.splitlines()
+    print(stdout.splitlines())
 
 Execute command with huge output:
 
@@ -157,12 +157,18 @@ class SSH(object):
 
         client = self._get_client()
 
+        should_close_stdin = False
         if isinstance(stdin, str):
             stdin = io.StringIO(stdin)
+            should_close_stdin = True
 
+        try:
             return self._run(client, cmd, stdin=stdin, stdout=stdout,
                              stderr=stderr, raise_on_error=raise_on_error,
                              timeout=timeout)
+        finally:
+            if should_close_stdin:
+                stdin.close()
 
     def _run(self, client, cmd, stdin=None, stdout=None, stderr=None,
              raise_on_error=True, timeout=3600):
@@ -246,15 +252,15 @@ class SSH(object):
 
         :returns: tuple (exit_status, stdout, stderr)
         """
-        stdout = io.StringIO()
-        stderr = io.StringIO()
+        with io.StringIO() as stdout:
+            with io.StringIO() as stderr:
 
                 exit_status, data = self.run(cmd, stderr=stderr, stdout=stdout,
                                              stdin=stdin, timeout=timeout,
                                              raise_on_error=False)
                 stdout.seek(0)
                 stderr.seek(0)
-        return (exit_status, stdout.read(), stderr.read())
+                return exit_status, stdout.read(), stderr.read()
 
     def wait(self, timeout=120, interval=1):
         """Wait for the host will be available via ssh."""

tests/unit/utils/test_sshutils.py

@@ -128,22 +128,26 @@ class SSHTestCase(test.TestCase):
         m_client.close.assert_called_once_with()
         self.assertFalse(self.ssh._client)
 
-    @mock.patch("rally.utils.sshutils.io.StringIO")
-    def test_execute(self, mock_string_io):
-        mock_string_io.side_effect = stdio = [mock.Mock(), mock.Mock()]
-        stdio[0].read.return_value = "stdout fake data"
-        stdio[1].read.return_value = "stderr fake data"
+    def test_execute(self):
+        stdout_txt = "stdout fake data"
+        stdout_io = io.StringIO(stdout_txt)
+        stderr_txt = "stderr fake data"
+        stderr_io = io.StringIO(stderr_txt)
+
+        with mock.patch("rally.utils.sshutils.io.StringIO") as mock_string_io:
+            mock_string_io.side_effect = [stdout_io, stderr_io]
             with mock.patch.object(self.ssh, "run") as mock_run:
                 mock_run.return_value = (0, None)
                 status, stdout, stderr = self.ssh.execute("cmd",
                                                           stdin="fake_stdin",
                                                           timeout=43)
+
         mock_run.assert_called_once_with(
-            "cmd", stdin="fake_stdin", stdout=stdio[0],
-            stderr=stdio[1], timeout=43, raise_on_error=False)
+            "cmd", stdin="fake_stdin", stdout=stdout_io, stderr=stderr_io,
+            timeout=43, raise_on_error=False)
         self.assertEqual(0, status)
-        self.assertEqual("stdout fake data", stdout)
-        self.assertEqual("stderr fake data", stderr)
+        self.assertEqual(stdout_txt, stdout)
+        self.assertEqual(stderr_txt, stderr)
 
     @mock.patch("rally.utils.sshutils.time")
     def test_wait_timeout(self, mock_time):