From ccbe5818af20f8c12043f5c30c277a74714405e0 Mon Sep 17 00:00:00 2001 From: "Bernhard M. Wiedemann" Date: Wed, 24 Jan 2018 22:26:18 +0100 Subject: bpo-29708: Setting SOURCE_DATE_EPOCH forces hash-based .pyc files (GH-5200) To support reproducible builds, the setting of of SOURCE_DATE_EPOCH triggers the py_compile module -- and by extension, compileall -- to forcibly compile with hash-based .pyc files. This eliminates the possibility of timestamp-based .pyc files which vary between builds. --- Lib/test/test_py_compile.py | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'Lib/test/test_py_compile.py') diff --git a/Lib/test/test_py_compile.py b/Lib/test/test_py_compile.py index bcb686c86b..8fc0b3308c 100644 --- a/Lib/test/test_py_compile.py +++ b/Lib/test/test_py_compile.py @@ -98,6 +98,18 @@ class PyCompileTests(unittest.TestCase): self.assertFalse(os.path.exists( importlib.util.cache_from_source(bad_coding))) + def test_source_date_epoch(self): + testtime = 123456789 + with support.EnvironmentVarGuard() as env: + env["SOURCE_DATE_EPOCH"] = str(testtime) + py_compile.compile(self.source_path, self.pyc_path) + self.assertTrue(os.path.exists(self.pyc_path)) + self.assertFalse(os.path.exists(self.cache_path)) + with open(self.pyc_path, 'rb') as fp: + flags = importlib._bootstrap_external._classify_pyc( + fp.read(), 'test', {}) + self.assertEqual(flags, 0b11) + @unittest.skipIf(sys.flags.optimize > 0, 'test does not work with -O') def test_double_dot_no_clobber(self): # http://bugs.python.org/issue22966 -- cgit v1.2.1