Fix formatting timezone offset

Displaying the offset in seconds makes very little sense. We should
adhere to ISO 8601 format of `+HH:MM` which is much easier to
understand.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

bin/pungi-koji

@@ -252,6 +252,7 @@ def main():
 def run_compose(compose, create_latest_link=True, latest_link_status=None):
     import pungi.phases
     import pungi.metadata
+    import pungi.util
 
     errors = []
 
@@ -262,9 +263,7 @@ def run_compose(compose, create_latest_link=True, latest_link_status=None):
     compose.log_info("Working directory: %s" % os.getcwd())
     compose.log_info("Command line: %s" % " ".join([pipes.quote(arg) for arg in sys.argv]))
     compose.log_info("Compose top directory: %s" % compose.topdir)
-    is_dst = time.daylight and time.localtime().tm_isdst > 0
-    compose.log_info("Current timezone offset: %s"
-                     % time.altzone if is_dst else time.timezone)
+    compose.log_info("Current timezone offset: %s" % pungi.util.get_tz_offset())
     compose.read_variants()
 
     # dump the config file

pungi/util.py

@@ -802,3 +802,12 @@ def retry(timeout=120, interval=30, wait_on=Exception):
 @retry(wait_on=RuntimeError)
 def git_ls_remote(baseurl, ref):
     return run(['git', 'ls-remote', baseurl, ref])
+
+
+def get_tz_offset():
+    """Return a string describing current local timezone offset."""
+    is_dst = time.daylight and time.localtime().tm_isdst > 0
+    offset = time.altzone if is_dst else time.timezone
+    hours = offset / 3600
+    minutes = (offset / 60) % 60
+    return "%+03d:%02d" % (hours, minutes)

tests/test_util.py

@@ -591,5 +591,35 @@ class TestVersionGenerator(unittest.TestCase):
         self.assertEqual(util.version_generator(compose, None), None)
 
 
+class TestTZOffset(unittest.TestCase):
+    @mock.patch('time.daylight', new=False)
+    @mock.patch('time.altzone', new=7200)
+    @mock.patch('time.timezone', new=3600)
+    @mock.patch('time.localtime', new=lambda: mock.Mock(tm_isdst=0))
+    def test_zone_without_dst(self):
+        self.assertEqual(util.get_tz_offset(), "+01:00")
+
+    @mock.patch('time.daylight', new=True)
+    @mock.patch('time.altzone', new=7200)
+    @mock.patch('time.timezone', new=3600)
+    @mock.patch('time.localtime', new=lambda: mock.Mock(tm_isdst=0))
+    def test_with_active_dst(self):
+        self.assertEqual(util.get_tz_offset(), "+01:00")
+
+    @mock.patch('time.daylight', new=True)
+    @mock.patch('time.altzone', new=9000)
+    @mock.patch('time.timezone', new=3600)
+    @mock.patch('time.localtime', new=lambda: mock.Mock(tm_isdst=1))
+    def test_with_inactive_dst(self):
+        self.assertEqual(util.get_tz_offset(), "+02:30")
+
+    @mock.patch('time.daylight', new=False)
+    @mock.patch('time.altzone', new=0)
+    @mock.patch('time.timezone', new=0)
+    @mock.patch('time.localtime', new=lambda: mock.Mock(tm_isdst=0))
+    def test_utc(self):
+        self.assertEqual(util.get_tz_offset(), "+00:00")
+
+
 if __name__ == "__main__":
     unittest.main()