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bpo-29708: Setting SOURCE_DATE_EPOCH forces hash-based .pyc files (GH-5200)

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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.
This commit is contained in:
Bernhard M. Wiedemann 2018-01-24 22:26:18 +01:00 • committed by Brett Cannon
parent 6f6eb35f9b
commit ccbe5818af
4 changed files with 22 additions and 1 deletions
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12
Lib/test/test_py_compile.py
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@ -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