From 63f7dde2e01bf52727f02d14e3091d5e3deab450 Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Sat, 7 Jan 2023 09:38:22 +0100
Subject: [PATCH] Make tests pass after 2038

inspired by https://github.com/python/cpython/commit/0af681b652c43f0ba90988400ecc1e7934fbfc5d

Background:
As part of my work on reproducible builds for openSUSE, I check that software still gives identical build results in the future.
The usual offset is +16 years, because that is how long I expect some software will be used in some places.
This showed up failing tests in our package build.
See https://reproducible-builds.org/ for why this matters.
---
 enaml/core/import_hooks.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/enaml/core/import_hooks.py b/enaml/core/import_hooks.py
index d2779fe75..fef481770 100644
--- a/enaml/core/import_hooks.py
+++ b/enaml/core/import_hooks.py
@@ -307,7 +307,7 @@ def _write_cache(self, code, ts, file_info):
                 os.mkdir(file_info.cache_dir)
             with open(file_info.cache_path, 'w+b') as cache_file:
                 cache_file.write(MAGIC_NUMBER)
-                cache_file.write(struct.pack('i', ts))
+                cache_file.write(struct.pack('<L', ts & 0xFFFF_FFFF))
                 marshal.dump(code, cache_file)
         except (OSError, IOError):
             pass
@@ -328,7 +328,7 @@ def _get_magic_info(self, file_info):
         """
         with open(file_info.cache_path, 'rb') as cache_file:
             magic = cache_file.read(4)
-            timestamp = struct.unpack('i', cache_file.read(4))[0]
+            timestamp = struct.unpack('<L', cache_file.read(4))[0]
         return (magic, timestamp)
 
     def read_source(self):