On 2020-11-22, Vagrant Cascadian wrote: > A date string that defaults to the current date is embedded in > /usr/share/metainfo/com.obsproject.Studio.appdata.xml, causing builds on > different days to not build reproducibly. > > > https://tests.reproducible-builds.org/debian/rb-pkg/bullseye/amd64/diffoscope-results/obs-studio.html > 21 ····<release·version="26.0.2+dfsg1-1"·date="2021-12-18"/> 21 > ····<release·version="26.0.2+dfsg1-1"·date="2020-11-15"/> > > This can be fixed by setting a value from the configure target that uses > SOURCE_DATE_EPOCH: > > https://reproducible-builds.org/docs/source-date-epoch/ > > The attached patch does this. > > > Alternately, it may be worth exploring patching > UI/xdg-data/CMakeLists.txt to support SOURCE_DATE_EPOCH and get the > support merged upstream.
In case you prefer that approach, the attached patch implements it... though needs more work to be cross-platform as it relies on specific features of GNU date. The source-date-epoch link above documents some of that. live well, vagrant
From b18355ee4991bb1a1c1160f35d7abe2f18175cfc Mon Sep 17 00:00:00 2001 From: Vagrant Cascadian <vagr...@reproducible-builds.org> Date: Mon, 23 Nov 2020 02:59:54 +0000 Subject: [PATCH 3/3] UI/xdg-data/CMakeLists.txt: Set APPDATA_RELEASE_DATE from SOURCE_DATE_EPOCH environment variable to ensure reproducible builds. https://reproducible-builds.org/docs/source-date-epoch/ --- UI/xdg-data/CMakeLists.txt | 3 +++ 1 file changed, 3 insertions(+) diff --git a/UI/xdg-data/CMakeLists.txt b/UI/xdg-data/CMakeLists.txt index 9acd14e..1883902 100644 --- a/UI/xdg-data/CMakeLists.txt +++ b/UI/xdg-data/CMakeLists.txt @@ -4,6 +4,9 @@ if(NOT DEFINED APPDATA_RELEASE_DATE) OUTPUT_VARIABLE APPDATA_RELEASE_DATE WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" OUTPUT_STRIP_TRAILING_WHITESPACE) + elseif(DEFINED SOURCE_DATE_EPOCH) + execute_process(COMMAND date --utc --date="@${SOURCE_DATE_EPOCH}" +"%Y-%m-%d" + OUTPUT_VARIABLE APPDATA_RELEASE_DATE) else() file(TIMESTAMP "${CMAKE_SOURCE_DIR}/CMakeLists.txt" APPDATA_RELEASE_DATE "%Y-%m-%d") endif() -- 2.29.2
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