[PATCH 2/2] test-appliance: support a timestamp specifier which contains a timezone

["Theodore Ts'o" <tytso@mit.edu>]

Commit 545315976e72 ("report: capture the time zone in the test report
timestamp") in the fstests upstream adds a timezone to the timestamp.
This is useful, but it breaks the strptime parsing of the timestamp.
It's not entirely clear that adding a timezone is legal.  According to
this schema[1] that it is a ISO 8061 date/time stamp where the
"Timezone may not be specified".  However in this schema[2], the
timestamp is just an optional string, and it says nothing about the
format of the timestamp.

[1] https://gist.github.com/jclosure/45d7005d120d90ba6430130356e4cd61#file-xunit-xsd-L140
[2] https://github.com/junit-team/junit5/blob/main/platform-tests/src/test/resources/jenkins-junit.xsd#L96

It's not entirely clear which schema is "official", but in the spirit
of the second part of Jon Postel's Robustness principal --- "be
liberal in what you accept" --- fix gen_results_summary.py to accept
an ISO 8061 timestamp with or without the timestamp.

It might be that in the spirit of "be conservative in what you send",
fstests upstream should use the moral equivalent of 'date -u +"%F %T" |
sed -e "s/ /T/"' instead of 'date -Iseconds', but this change will
work either way, as well as with both the older and newer versions of
fstests.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 .../usr/lib/python3/dist-packages/gen_results_summary.py  | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/test-appliance/files/usr/lib/python3/dist-packages/gen_results_summary.py b/test-appliance/files/usr/lib/python3/dist-packages/gen_results_summary.py
index ecf5dc1a..44fb07d2 100644
--- a/test-appliance/files/usr/lib/python3/dist-packages/gen_results_summary.py
+++ b/test-appliance/files/usr/lib/python3/dist-packages/gen_results_summary.py
@@ -61,8 +61,12 @@ def parse_timestamp(timestamp):
     """Parse an ISO-8601-like timestamp as found in an xUnit file."""
     if timestamp == "":
         return 0
-    return time.mktime(datetime.strptime(timestamp,
-                                         '%Y-%m-%dT%H:%M:%S').timetuple())
+    for fmt in ('%Y-%m-%dT%H:%M:%S%z', '%Y-%m-%dT%H:%M:%S'):
+        try:
+            return time.mktime(datetime.strptime(timestamp, fmt).timetuple())
+        except ValueError:
+            pass
+    raise ValueError('no valid timestamp format found')
 
 def failed_tests(testsuite):
     """This iterator the failed tests from the testsuite."""
-- 
2.31.0