Fix errors when retrieving timezone from clock files.

Author: sdispater

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Fixed the `weeks` property for negative `Period` instances.
 - Fixed `start_of()` methods not setting microseconds to 0.
+- Fixed errors on some systems when retrieving timezone from clock files.
 
 
 ## [2.0.1] - 2018-05-10

pendulum/tz/local_timezone.py

@@ -14,6 +14,7 @@
 from typing import Union
 
 from .timezone import Timezone, TimezoneFile
+from .zoneinfo.exceptions import InvalidTimezone
 
 
 _mock_local_timezone = None
@@ -200,16 +201,16 @@ def _get_unix_timezone(_root='/'):  # type: (str) -> Timezone
                 line = line[match.end():]
                 etctz = line[:end_re.search(line).start()]
 
-                parts = etctz.replace(' ', '_').split('/')[-2:]
+                parts = list(reversed(etctz.replace(' ', '_').split('/')))
+                tzpath = []
                 while parts:
-                    tzpath = '/'.join(parts)
+                    tzpath.insert(0, parts.pop(0))
+
                     try:
-                        return Timezone(tzpath)
-                    except (ValueError, IOError, OSError):
+                        return Timezone('/'.join(tzpath))
+                    except InvalidTimezone:
                         pass
 
-                    parts.pop(0)
-
     # systemd distributions use symlinks that include the zone name,
     # see manpage of localtime(5) and timedatectl(1)
     tzpath = os.path.join(_root, 'etc/localtime')