File reproducible.patch of Package seamonkey.openSUSE_Backports_SLE-15-SP4_Update

https://github.com/mozilla/gecko-dev/commit/025982b6714051c747dcb9600d6e5c92d2dcaf7b

From 025982b6714051c747dcb9600d6e5c92d2dcaf7b Mon Sep 17 00:00:00 2001
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Date: Thu, 16 Mar 2023 14:01:58 +0000
Subject: [PATCH] Bug 1817032 - Honor SOURCE_DATE_EPOCH to build langpacks
 reproducibly. r=eemeli@mozilla.com

Differential Revision: https://phabricator.services.mozilla.com/D169979
---
 .../mozbuild/action/langpack_manifest.py        | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/python/mozbuild/mozbuild/action/langpack_manifest.py b/python/mozbuild/mozbuild/action/langpack_manifest.py
index f82a329cc..10e42fe99 100644
--- a/python/mozbuild/mozbuild/action/langpack_manifest.py
+++ b/python/mozbuild/mozbuild/action/langpack_manifest.py
@@ -16,6 +16,7 @@ import os
 import json
 import io
 import datetime
+import time
 import requests
 import mozversioncontrol
 import mozpack.path as mozpath
@@ -36,9 +37,17 @@ def write_file(path, content):
 pushlog_api_url = "{0}/json-rev/{1}"
 
 
+def get_build_date():
+    """Return the current date or SOURCE_DATE_EPOCH, if set."""
+    return datetime.datetime.utcfromtimestamp(
+        int(os.environ.get("SOURCE_DATE_EPOCH", time.time()))
+    )
+
+
 ###
-# Retrievers a UTC datetime of the push for the current commit
-# from a mercurial clone directory.
+# Retrieves a UTC datetime of the push for the current commit from a
+# mercurial clone directory. The SOURCE_DATE_EPOCH environment
+# variable is honored, for reproducibility.
 #
 # Args:
 #    path (str) - path to a directory
@@ -54,7 +63,7 @@ def get_dt_from_hg(path):
     with mozversioncontrol.get_repository_object(path=path) as repo:
         phase = repo._run("log", "-r", ".", "-T" "{phase}")
         if phase.strip() != "public":
-            return datetime.datetime.utcnow()
+            return get_build_date()
         repo_url = repo._run("paths", "default")
         repo_url = repo_url.strip().replace("ssh://", "https://")
         repo_url = repo_url.replace("hg://", "https://")
@@ -99,7 +108,7 @@ def get_timestamp_for_locale(path):
         dt = get_dt_from_hg(path)
 
     if dt is None:
-        dt = datetime.datetime.utcnow()
+        dt = get_build_date()
 
     dt = dt.replace(microsecond=0)
     return dt.strftime("%Y%m%d%H%M%S")