From 06700865e1324fc33ae864a5114900cfc7dce6f5 Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Mon, 16 Apr 2018 02:10:04 +0200
Subject: Allow build date to be overridden for reproducible documentation

See https://reproducible-builds.org/specs/source-date-epoch/ for the definition
of this variable.
---
 lv2/lv2plug.in/ns/lv2core/meta.ttl | 7 +++++++
 lv2specgen/lv2specgen.py           | 7 +++++--
 wscript                            | 4 +++-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/lv2/lv2plug.in/ns/lv2core/meta.ttl b/lv2/lv2plug.in/ns/lv2core/meta.ttl
index 0b655fd..f4d692c 100644
--- a/lv2/lv2plug.in/ns/lv2core/meta.ttl
+++ b/lv2/lv2plug.in/ns/lv2core/meta.ttl
@@ -32,6 +32,7 @@ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH R
 	doap:developer <http://drobilla.net/drobilla#me> ,
 		<http://plugin.org.uk/swh.xrdf#me> ;
 	doap:helper meta:larsl ,
+		meta:bmwiedemann ,
 		meta:gabrbedd ,
 		meta:daste ,
 		meta:kfoltman ,
@@ -202,3 +203,9 @@ meta:harry
 	a foaf:Person ;
 	foaf:name "Harry van Haaren" ;
 	foaf:mbox <harryhaaren@gmail.com> .
+
+meta:bmwiedemann
+	a foaf:Person ;
+	foaf:name "Bernhard M. Wiedemann" ;
+	foaf:mbox <bwiedemann@suse.de> .
+
diff --git a/lv2specgen/lv2specgen.py b/lv2specgen/lv2specgen.py
index 11647f2..38594fb 100755
--- a/lv2specgen/lv2specgen.py
+++ b/lv2specgen/lv2specgen.py
@@ -46,6 +46,7 @@ import optparse
 import os
 import re
 import sys
+import time
 import xml.sax.saxutils
 import xml.dom
 import xml.dom.minidom
@@ -1374,8 +1375,10 @@ def specgen(specloc, indir, style_uri, docdir, tags, opts, instances=False, root
     else:
         template = template.replace('@COMMENT@', '')
 
-    template = template.replace('@DATE@', datetime.datetime.utcnow().strftime('%F'))
-    template = template.replace('@TIME@', datetime.datetime.utcnow().strftime('%F %H:%M UTC'))
+    now = int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))
+    build_date = datetime.datetime.utcfromtimestamp(now)
+    template = template.replace('@DATE@', build_date.strftime('%F'))
+    template = template.replace('@TIME@', build_date.strftime('%F %H:%M UTC'))
 
     # Write index row
     if index_path is not None:
diff --git a/wscript b/wscript
index 7236286..1e3c8af 100644
--- a/wscript
+++ b/wscript
@@ -184,7 +184,9 @@ def build_index(task):
 
     if date is None:
         import datetime
-        date = datetime.datetime.now().isoformat()
+        import time
+        now = int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))
+        date = datetime.datetime.utcfromtimestamp(now).strftime('%F')
 
     subst_file(task.inputs[0].abspath(), task.outputs[0].abspath(),
                { '@ROWS@': ''.join(rows),
-- 
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