Set modification time in tarfile of ramdisk logs

If we do not set this explicitly, tar will warn "journal: implausibly
old time stamp" when the user tries to untar the log files.

Change-Id: I4a5a1ffd4eeca9697cdcf16e02d3ff3c22d7132c

ironic_python_agent/inspector.py

@@ -17,6 +17,7 @@ import base64
 import io
 import json
 import tarfile
+import time
 
 import netaddr
 from oslo_concurrency import processutils
@@ -287,6 +288,7 @@ def collect_logs(data, failures):
         with tarfile.open(fileobj=fp, mode='w:gz') as tar:
             tarinfo = tarfile.TarInfo('journal')
             tarinfo.size = len(out)
+            tarinfo.mtime = time.time()
             tar.addfile(tarinfo, journal)
 
         fp.seek(0)

ironic_python_agent/tests/unit/test_inspector.py

@@ -386,12 +386,13 @@ class TestCollectLogs(unittest.TestCase):
         mock_execute.return_value = (contents, '')
 
         data = {}
-        inspector.collect_logs(data, None)
+        with mock.patch('time.time', return_value=42):
+            inspector.collect_logs(data, None)
         res = io.BytesIO(base64.b64decode(data['logs']))
 
         with tarfile.open(fileobj=res) as tar:
-            members = [(m.name, m.size) for m in tar]
-            self.assertEqual([('journal', len(contents))], members)
+            members = [(m.name, m.size, m.mtime) for m in tar]
+            self.assertEqual([('journal', len(contents), 42)], members)
 
             member = tar.extractfile('journal')
             self.assertEqual(expected_contents, member.read().decode('utf-8'))