From aa97249b332f23fec7b0575ab5d634b8180dcada Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Tue, 5 Jan 2016 15:15:41 -0800
Subject: Set generate.consistent.ids in xsl stylesheets for more repeatable
 builds

Causes auto-generation of id attributes to use values based on position in
document, such as id="id-1.5.9.5.2", instead of based on memory address of
parse tree, such as id="idm140664351287904", so that generated documents
end up with the same contents across rebuilds & platforms (especially on
platforms using address space layout randomization).

Does not guarantee long-term stability of links across releases, just
repeatability when building the same release multiple times - values
will change when documents are edited to add/remove/reorder sections.

Only effective when used with version 1.77 or later of the
DocBook XSL stylesheets (released in 2012).

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
 xorg-chunk.xsl | 7 +++++++
 xorg-fo.xsl    | 7 +++++++
 xorg-xhtml.xsl | 6 ++++++
 xorg.xsl       | 6 ++++++
 4 files changed, 26 insertions(+)

diff --git a/xorg-chunk.xsl b/xorg-chunk.xsl
index 93b18b5..2e7f7b5 100644
--- a/xorg-chunk.xsl
+++ b/xorg-chunk.xsl
@@ -44,6 +44,13 @@
   <!-- Index links should point to indexterm location, not start of section -->
   <xsl:param name="index.links.to.section" select="0"/>
 
+  <!--
+      Use element count instead of random number for id generation, for more
+      repeatable builds
+    -->
+  <xsl:param name="generate.consistent.ids" select="1"/>
+
+
 			<!-- HTML Parameters -->
 
   <!-- Uses XSLT Extension to provide more valid and better formatted elements-->
diff --git a/xorg-fo.xsl b/xorg-fo.xsl
index 4680db3..41fb3f3 100644
--- a/xorg-fo.xsl
+++ b/xorg-fo.xsl
@@ -41,6 +41,13 @@
     <xsl:attribute name="break-after">page</xsl:attribute>
   </xsl:attribute-set>
 
+  <!--
+      Use element count instead of random number for id generation, for more
+      repeatable builds
+    -->
+  <xsl:param name="generate.consistent.ids" select="1"/>
+
+
 			<!-- Pagination and General Styles FO Parameters -->
   <!--
      Speed up ps & pdf creation by not creating pages with "draft" image,
diff --git a/xorg-xhtml.xsl b/xorg-xhtml.xsl
index d9b7b3e..502aafc 100644
--- a/xorg-xhtml.xsl
+++ b/xorg-xhtml.xsl
@@ -44,6 +44,12 @@
   <!-- Index links should point to indexterm location, not start of section -->
   <xsl:param name="index.links.to.section" select="0"/>
 
+  <!--
+      Use element count instead of random number for id generation, for more
+      repeatable builds
+    -->
+  <xsl:param name="generate.consistent.ids" select="1"/>
+
 			<!-- HTML Parameters -->
 
   <!-- Uses XSLT Extension to provide more valid and better formatted elements-->
diff --git a/xorg.xsl b/xorg.xsl
index 0a2ff62..ff99273 100644
--- a/xorg.xsl
+++ b/xorg.xsl
@@ -41,6 +41,12 @@ DEALINGS IN THE SOFTWARE.
   <!-- Index links should point to indexterm location, not start of section -->
   <xsl:param name="index.links.to.section" select="0"/>
 
+  <!--
+      Use element count instead of random number for id generation, for more
+      repeatable builds
+    -->
+  <xsl:param name="generate.consistent.ids" select="1"/>
+
   <!-- PDF bookmarks extensions for FOP version 0.90 and later will be used. -->
   <xsl:param name="fop.extensions" select="0"></xsl:param>
   <xsl:param name="fop1.extensions" select="1"></xsl:param>
-- 
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