From 93a613f6ccd20e2c60bf32c102b12458e47bcf9b Mon Sep 17 00:00:00 2001
From: William Deegan <bill@baddogconsulting.com>
Date: Sun, 13 Nov 2022 11:35:43 -0500
Subject: Add example site_init.py to propagate SOURCE_DATE_EPOCH from users
 shell environment to support reproducible builds. This is replacement logic
 for PR #4239

---
 README.rst                              |  8 ++++++++
 packaging/etc/README.txt                |  0
 packaging/etc/reproducible_install.sh   | 19 +++++++++++++++++++
 packaging/etc/reproducible_site_init.py | 23 +++++++++++++++++++++++
 4 files changed, 50 insertions(+)
 create mode 100644 packaging/etc/README.txt
 create mode 100644 packaging/etc/reproducible_install.sh
 create mode 100644 packaging/etc/reproducible_site_init.py

diff --git a/README.rst b/README.rst
index 1cc390d..bf34fd1 100755
--- a/README.rst
+++ b/README.rst
@@ -258,6 +258,14 @@ software, or hardware) to support continued work on the project.  Information
 is available at https://www.scons.org/donate.html
 or the GitHub Sponsors button on https://github.com/scons/scons.
 
+Reproducible Builds
+===================
+In order to suppor those users who which to produce reproducible builds
+(https://reproducible-builds.org/specs/source-date-epoch/) we're now including
+logic to force SCons to propagate SOURCE_DATE_EPOCH from your shell environment for
+all SCons builds to support reproducible builds we're now providing an example
+site_init.py and a script to install it in your ~/.scons. See packaging/etc/README.txt
+for more info
 
 For More Information
 ====================
diff --git a/packaging/etc/README.txt b/packaging/etc/README.txt
new file mode 100644
index 0000000..e69de29
diff --git a/packaging/etc/reproducible_install.sh b/packaging/etc/reproducible_install.sh
new file mode 100644
index 0000000..2eb6ad1
--- /dev/null
+++ b/packaging/etc/reproducible_install.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+mkdir -p ~/.site_scons
+
+if [ ! -f "~/.site_scons/site_init.py" ]
+then
+    echo "File ~/.site_scons/site_init.py does not exist"
+    echo "We will add one which supports reproducible builds"
+    cp ${SCRIPT_DIR}/site_init.py ~/.site_scons/site_init.py
+else
+    echo "File ~/.site_scons/site_init.py already exists"
+    echo "We will not overwrite it. Please copy the content"
+    echo "from ${SCRIPT_DIR}/site_init.py"
+fi
diff --git a/packaging/etc/reproducible_site_init.py b/packaging/etc/reproducible_site_init.py
new file mode 100644
index 0000000..e4672a1
--- /dev/null
+++ b/packaging/etc/reproducible_site_init.py
@@ -0,0 +1,23 @@
+"""
+Use this file as your ~/.site_scons/scons_init.py to enable reprodicble builds as described at
+https://reproducible-builds.org/specs/source-date-epoch/
+"""
+
+import os
+import SCons.Environment
+
+old_init = SCons.Environment.Base.__init__
+
+
+def new_init(self, **kw):
+    """
+    This logic will add SOURCE_DATE_EPOCH to the execution environment used to run
+    all the build commands.
+    """
+    print("In my custom init")
+    old_init(self, **kw)
+    if 'SOURCE_DATE_EPOCH' in os.environ:
+        self._dict['ENV']['SOURCE_DATE_EPOCH'] = os.environ['SOURCE_DATE_EPOCH']
+
+
+SCons.Environment.Base.__init__ = new_init
-- 
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