fix(human.py): return zero for non-finite durations

CHANGELOG.md

@@ -47,6 +47,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * args.py: arguments with characters outside of ASCII arrive intact when the Icinga 2 agent for Windows starts the consumer
 * base.py: on Windows, what argparse writes to stderr no longer arrives with an empty line after every line
 * disk.py: `is_within()` with the filesystem root as a root
+* human.py: `human2seconds()` ([#409](https://github.com/Linuxfabrik/lib/issues/409))
 * logsource.py: `read()` names missing journal rights instead of passing on journalctl's hint
 * net.py: `FAMILIYSTR` names an IPv6 address "6" instead of "irda" on Windows
 * powershell.py, shell.py: `run_ps()` and `shell_exec()` return on time on Windows after a timeout, even when a child process keeps the output open

human.py

@@ -488,7 +488,8 @@ def human2seconds(string):
     except (ValueError, TypeError):
         return 0
 
-    return int(value * _UNIT_TO_SECONDS[unit])
+    seconds = value * _UNIT_TO_SECONDS[unit]
+    return int(seconds) if math.isfinite(seconds) else 0
 
 
 def humanduration2seconds(text):

tests/human/unit-test/run

@@ -182,6 +182,16 @@ class TestHuman2Bytes(unittest.TestCase):
 
 
 class TestHuman2Seconds(unittest.TestCase):
+    def test_nonfinite_durations_return_zero(self):
+        for value in ('nans', 'NaNs', '+infs', '-infs', '1e309s', '1e308Y'):
+            with self.subTest(value=value):
+                self.assertEqual(human.human2seconds(value), 0)
+
+    def test_finite_durations_keep_truncation(self):
+        self.assertEqual(human.human2seconds('-2.5h'), -9000)
+        self.assertEqual(human.human2seconds('0.5s'), 0)
+        self.assertEqual(human.human2seconds('1e300s'), int(1e300))
+
     def test_units(self):
         self.assertEqual(human.human2seconds('1h'), 3600)
         self.assertEqual(human.human2seconds('1d'), 86400)