Source: blender
Version: 2.77.a+dfsg0-3
Severity: wishlist
Tags: patch
User: [email protected]
Usertags: timestamps
X-Debbugs-Cc: [email protected]
Hi!
While working on the "reproducible builds" effort [1], we have noticed
that blender could not be built reproducibly.
Specifically, the current system time is used to define BUILD_DATE and
BUILD_TIME in build_files/cmake/buildinfo.cmake, obviously rendering
the build unreproducible.
The attached patch uses SOURCE_DATE_EPOCH [2] instead of the current
time. This should make the build reproducible.
Regards,
Fabian Wolff
[1] https://wiki.debian.org/ReproducibleBuilds
[2] https://reproducible-builds.org/specs/source-date-epoch/
--- a/build_files/cmake/buildinfo.cmake
+++ b/build_files/cmake/buildinfo.cmake
@@ -134,8 +134,13 @@
# BUILD_PLATFORM and BUILD_PLATFORM are taken from CMake
# but BUILD_DATE and BUILD_TIME are platform dependent
if(UNIX)
- execute_process(COMMAND date "+%Y-%m-%d" OUTPUT_VARIABLE BUILD_DATE OUTPUT_STRIP_TRAILING_WHITESPACE)
- execute_process(COMMAND date "+%H:%M:%S" OUTPUT_VARIABLE BUILD_TIME OUTPUT_STRIP_TRAILING_WHITESPACE)
+ 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()
+ execute_process(COMMAND date "+%Y-%m-%d" OUTPUT_VARIABLE BUILD_DATE OUTPUT_STRIP_TRAILING_WHITESPACE)
+ execute_process(COMMAND date "+%H:%M:%S" OUTPUT_VARIABLE BUILD_TIME OUTPUT_STRIP_TRAILING_WHITESPACE)
+ endif()
endif()
if(WIN32)
execute_process(COMMAND cmd /c date /t OUTPUT_VARIABLE BUILD_DATE OUTPUT_STRIP_TRAILING_WHITESPACE)
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