Bug#912299: blender: make the build reproducible

[Mathieu Malaterre]

Control: fixed -1  2.81.a+dfsg-4

On Mon, Sep 14, 2020 at 12:06 PM Chris Lamb  wrote:
>
> Hi Mathieu,
>
> > The original text pasted patch does not apply anymore in the current
> > blender/sid version.
> >
> > Could you confirm the bug is fixed ? If not please provide an
> > updated patch.
>
> I glanced at this patch/bug (from 2018), but it seems like blender
> became reproducible in Debian/amd64/sid around version 2.81.a+dfsg-4.

ACK. Thanks !

Bug#912299: blender: make the build reproducible

[Nicholas M Gregory]

Source: blender
Version: 2.79.b+dfsg0-4
Severity: wishlist
Tags: patch
X-Debbugs-Cc: reproducible-bui...@lists.alioth.debian.org

Hi there,

While working on the reproducible builds project
(https://wiki.debian.org/ReproducibleBuilds), we noticed that blender
could not be built reproducibly.

The attached patch changes the build system to use the
SOURCE_DATE_EPOCH envvar (if set) in place of the current build
date/time to make blender build reproducibly.

Best,
-Nick Gregory

 begin patch 
diff --git a/build_files/cmake/buildinfo.cmake
b/build_files/cmake/buildinfo.cmake
index a43b99f..ab7d3e3 100644
--- a/build_files/cmake/buildinfo.cmake
+++ b/build_files/cmake/buildinfo.cmake
@@ -148,12 +148,21 @@ endif()
 # BUILD_PLATFORM and BUILD_PLATFORM are taken from CMake
 # but BUILD_DATE and BUILD_TIME are platform dependent
 if(UNIX)
-   if(NOT BUILD_DATE)
-   execute_process(COMMAND date "+%Y-%m-%d"
OUTPUT_VARIABLE BUILD_DATE OUTPUT_STRIP_TRAILING_WHITESPACE)
-   endif()
-   if(NOT BUILD_TIME)
-   execute_process(COMMAND date "+%H:%M:%S"
OUTPUT_VARIABLE BUILD_TIME OUTPUT_STRIP_TRAILING_WHITESPACE)
-   endif()
+if(DEFINED ENV{SOURCE_DATE_EPOCH})
+execute_process(COMMAND "date" "-u" "-d"
"@$ENV{SOURCE_DATE_EPOCH}" "+%Y-%m-%d"
+OUTPUT_VARIABLE BUILD_DATE
+OUTPUT_STRIP_TRAILING_WHITESPACE)
+execute_process(COMMAND "date" "-u" "-d"
"@$ENV{SOURCE_DATE_EPOCH}" "+%H:%M:%S"
+OUTPUT_VARIABLE BUILD_TIME
+OUTPUT_STRIP_TRAILING_WHITESPACE)
+else()
+if(NOT BUILD_DATE)
+execute_process(COMMAND date "+%Y-%m-%d" OUTPUT_VARIABLE
BUILD_DATE OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+if(NOT BUILD_TIME)
+execute_process(COMMAND date "+%H:%M:%S" OUTPUT_VARIABLE
BUILD_TIME OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+endif()
 elseif(WIN32)
if(NOT BUILD_DATE)
execute_process(COMMAND cmd /c date /t OUTPUT_VARIABLE
BUILD_DATE OUTPUT_STRIP_TRAILING_WHITESPACE)