Bug#1039932: python-bitstring: please make the build reproducible

[Chris Lamb]

Source: python-bitstring
Version: 4.0.2-1
Severity: wishlist
Tags: patch
User: reproducible-bui...@lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-b...@lists.alioth.debian.org

Hi,

Whilst working on the Reproducible Builds effort [0], we noticed that
python-bitstring could not be built reproducibly.

This was because the documentation used the build year in the
documentation:

│ │ │ ├── ./usr/share/doc/python-bitstring-doc/html/bitarray.html
│ │ │ │ @@ -973,11 +973,11 @@
│ │ │ │               >previous</a> |</li>
│ │ │ │          <li class="nav-item nav-item-0"><a href="index.html">bitstring 
4.0 documentation</a> &#187;</li>
│ │ │ │            <li class="nav-item nav-item-1"><a href="reference.html" 
>Reference</a> &#187;</li>
│ │ │ │          <li class="nav-item nav-item-this"><a href="">BitArray 
Class</a></li> 
│ │ │ │        </ul>
│ │ │ │      </div>
│ │ │ │      <div class="footer" role="contentinfo">
│ │ │ │ -        &#169; Copyright 2023 - 2023, Scott Griffiths.
│ │ │ │ +        &#169; Copyright 2023 - 2024, Scott Griffiths.
│ │ │ │      </div>
│ │ │ │    </body>
│ │ │ │  </html>

Patch attached that bases this value on SOURCE_DATE_EPOCH if
available.

 [0] https://reproducible-builds.org/


Regards,

-- 
      ,''`.
     : :'  :     Chris Lamb
     `. `'`      la...@debian.org / chris-lamb.co.uk
       `-

--- a/debian/patches/0002-reproducible-build.patch      1970-01-01 
01:00:00.000000000 +0100
--- b/debian/patches/0002-reproducible-build.patch      2023-06-29 
17:25:47.227191969 +0100
@@ -0,0 +1,22 @@
+Description: Make the build reproducible
+Author: Chris Lamb <la...@debian.org>
+Last-Update: 2023-06-29
+
+--- python-bitstring-4.0.2.orig/doc/conf.py
++++ python-bitstring-4.0.2/doc/conf.py
+@@ -1,8 +1,14 @@
+ # Configuration file for the Sphinx documentation builder.
+ #
++import os
++import time
+ import datetime
+ 
+-year = datetime.datetime.now().year
++import datetime
++
++year = datetime.datetime.utcfromtimestamp(
++    int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))
++).year
+ 
+ project = 'bitstring'
+ copyright = f'2006 - {year}, Scott Griffiths'
--- a/debian/patches/series     2023-06-29 17:24:24.615705188 +0100
--- b/debian/patches/series     2023-06-29 17:25:46.187198262 +0100
@@ -1 +1,2 @@
 0001-delete-mybinder.org-remote-refs-privacy-breach-logo.patch
+0002-reproducible-build.patch