[Reproducible-builds] Bug#832917: hyperscan: please make the build reproducible

[Dhole]

Source: hyperscan 
Version: 4.2.0-1 
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: locale
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi,

While working on the "reproducible builds" effort [1], we have noticed
that hyperscan could not be built reproducibly.

During the build a timestamp is embedded in the compiled binaries.

The attached patch fixes this by using SOURCE_DATE_EPOCH as the
timestamp. Once applied, hyperscan can be built reproducibly in our
current experimental framework.

 [1]: https://wiki.debian.org/ReproducibleBuilds

Regards,
-- 
Dhole
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diff -Nru hyperscan-4.2.0/debian/changelog hyperscan-4.2.0/debian/changelog
--- hyperscan-4.2.0/debian/changelog	2016-07-25 21:15:48.000000000 +0200
+++ hyperscan-4.2.0/debian/changelog	2016-07-29 15:39:02.000000000 +0200
@@ -1,3 +1,11 @@
+hyperscan (4.2.0-1.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Use SOURCE_DATE_EPOCH as embedded timestamp to make the build
+    reproducible.
+
+ -- Eduard Sanou <dhole at openmailbox.org>  Fri, 29 Jul 2016 15:38:39 +0200
+
 hyperscan (4.2.0-1) unstable; urgency=medium
 
   * Initial release (Closes: #824838)
diff -Nru hyperscan-4.2.0/debian/patches/reproducible-timestamp.patch hyperscan-4.2.0/debian/patches/reproducible-timestamp.patch
--- hyperscan-4.2.0/debian/patches/reproducible-timestamp.patch	1970-01-01 01:00:00.000000000 +0100
+++ hyperscan-4.2.0/debian/patches/reproducible-timestamp.patch	2016-07-29 15:40:15.000000000 +0200
@@ -0,0 +1,27 @@
+Description: Reproducible timestamp
+ Use SOURCE_DATE_EPOCH as a timestamp to make the build reproducible.
+Author: Eduard Sanou <dhole at openmailbox.org>
+
+Index: hyperscan-4.2.0/CMakeLists.txt
+===================================================================
+--- hyperscan-4.2.0.orig/CMakeLists.txt
++++ hyperscan-4.2.0/CMakeLists.txt
+@@ -6,7 +6,17 @@ set (HS_MINOR_VERSION 2)
+ set (HS_PATCH_VERSION 0)
+ set (HS_VERSION ${HS_MAJOR_VERSION}.${HS_MINOR_VERSION}.${HS_PATCH_VERSION})
+ 
+-string (TIMESTAMP BUILD_DATE "%Y-%m-%d")
++if (DEFINED ENV{SOURCE_DATE_EPOCH})
++  execute_process(
++    COMMAND "date" "-u" "-d" "@$ENV{SOURCE_DATE_EPOCH}" "+%Y-%m-%d"
++    OUTPUT_VARIABLE BUILD_DATE 
++    OUTPUT_STRIP_TRAILING_WHITESPACE)
++else ()
++  execute_process(
++    COMMAND "date" "+%Y-%m-%d"
++    OUTPUT_VARIABLE BUILD_DATE
++    OUTPUT_STRIP_TRAILING_WHITESPACE)
++endif ()
+ 
+ set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
+ include(CheckCCompilerFlag)
diff -Nru hyperscan-4.2.0/debian/patches/series hyperscan-4.2.0/debian/patches/series
--- hyperscan-4.2.0/debian/patches/series	1970-01-01 01:00:00.000000000 +0100
+++ hyperscan-4.2.0/debian/patches/series	2016-07-29 15:39:15.000000000 +0200
@@ -0,0 +1 @@
+reproducible-timestamp.patch
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