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-rw-r--r--gnu/packages/patches/python-2.7-source-date-epoch.patch33
-rw-r--r--gnu/packages/python.scm9
2 files changed, 41 insertions, 1 deletions
diff --git a/gnu/packages/patches/python-2.7-source-date-epoch.patch b/gnu/packages/patches/python-2.7-source-date-epoch.patch
new file mode 100644
index 0000000000..be1f8e010e
--- /dev/null
+++ b/gnu/packages/patches/python-2.7-source-date-epoch.patch
@@ -0,0 +1,33 @@
+Honor the 'SOURCE_DATE_EPOCH' environment variable to allow for
+determinitic builds.
+
+--- a/Lib/py_compile.py
++++ b/Lib/py_compile.py
+@@ -105,7 +105,10 @@ def compile(file, cfile=None, dfile=None, doraise=False):
+ """
+ with open(file, 'U') as f:
+ try:
+- timestamp = long(os.fstat(f.fileno()).st_mtime)
++ if 'SOURCE_DATE_EPOCH' in os.environ:
++ timestamp = long(os.environ['SOURCE_DATE_EPOCH'])
++ else:
++ timestamp = long(os.fstat(f.fileno()).st_mtime)
+ except AttributeError:
+ timestamp = long(os.stat(file).st_mtime)
+ codestring = f.read()
+diff --git a/Python/import.c b/Python/import.c
+index e47ce63..7eecf9c 100644
+--- a/Python/import.c
++++ b/Python/import.c
+@@ -945,6 +945,11 @@ write_compiled_module(PyCodeObject *co, char *cpathname, struct stat *srcstat, t
+ /* Now write the true mtime (as a 32-bit field) */
+ fseek(fp, 4L, 0);
+ assert(mtime <= 0xFFFFFFFF);
++ if (Py_GETENV("SOURCE_DATE_EPOCH") != NULL) {
++ const char *epoch = Py_GETENV("SOURCE_DATE_EPOCH");
++ mtime = atoi(epoch);
++ }
++
+ PyMarshal_WriteLongToFile((long)mtime, fp, Py_MARSHAL_VERSION);
+ fflush(fp);
+ fclose(fp);
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 001d00e9be..07725c727a 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -92,7 +92,9 @@
(sha256
(base32
"1h7zbrf9pkj29hlm18b10548ch9757f75m64l47sy75rh43p7lqw"))
- (patches (list (search-patch "python-2.7-search-paths.patch")))))
+ (patches (map search-patch
+ '("python-2.7-search-paths.patch"
+ "python-2.7-source-date-epoch.patch")))))
(build-system gnu-build-system)
(arguments
`(#:tests? #f
@@ -158,6 +160,11 @@
"Lib/distutils/tests/test_spawn.py"
"Lib/test/test_subprocess.py"))
(("/bin/sh") (which "sh")))
+
+ ;; Use zero as the timestamp in .pyc files so that builds are
+ ;; deterministic. TODO: Remove it when this variable is set in
+ ;; gnu-build-system.scm.
+ (setenv "SOURCE_DATE_EPOCH" "0")
#t))
(add-before
'check 'pre-check