Reproducible builds enable anyone to reproduce bit by bit identical binary packages from a given source, so that anyone can verify that a given binary derived from the source it was said to be derived. There is more information about reproducible builds on the Debian wiki and on https://reproducible-builds.org. These pages explain in more depth why this is useful, what common issues exist and which workarounds and solutions are known.

Reproducible FreeBSD is an effort to apply this to FreeBSD. Thus FreeBSD is build twice, with a few variations added and then the resulting filesystems from the two builds are put into a compressed tar archive, which is finally compared using diffoscope. Please note that the toolchain is not varied at all as the rebuild happens on exactly the same system. More variations are expected to be seen in the wild.

There is a weekly run jenkins job to test the main branch of freebsd.git. The jenkins job is running reproducible_freebsd.sh, which via ssh triggers a build on a FreeBSD system and this script is solely responsible for creating this page. Feel invited to join #reproducible-builds (on irc.oftc.net) to request job runs whenever sensible. Patches and other feedback are very much appreciated - if you want to help, please start by looking at the ToDo list for FreeBSD, you might find something easy to contribute.
Thanks to IONOS for donating the virtual machines this is running on!

0 (0%) out of 0 FreeBSD files were reproducible in our test setup . These tests were last run on 2022-06-30 for the branch main at commit 9aa02d512 using diffoscope 217.

variationfirst buildsecond build
hostname osuosl169-amd64 or osuosl170-amd64the other one
domainname is not yet varied between rebuilds of FreeBSD.
env TZTZ="/usr/share/zoneinfo/Etc/GMT+12"TZ="/usr/share/zoneinfo/Etc/GMT-14"
env LANGLANG="en_GB.UTF-8"LANG="et_EE.UTF-8"
env LC_ALLnot setLC_ALL="et_EE.UTF-8"
env PATH is not yet varied between rebuilds of FreeBSD.
env USER is not yet varied between rebuilds of FreeBSD.
uid is not yet varied between rebuilds of FreeBSD.
gid is not yet varied between rebuilds of FreeBSD.
FreeBSD kernel version is not yet varied between rebuilds of FreeBSD.
umask is not yet varied between rebuilds of FreeBSD.
CPU type AMD Opteron 62xx class CPUsame for both builds
/bin/sh is not yet varied between rebuilds of FreeBSD.
year, month, dateosuosl171-amd64: today (2022-06-30) or osuosl172-amd64: 398 days in the future (2023-08-02)the other one
year, month, datetoday (2022-06-30)the 2nd build is done with the build node set 1 year, 1 month and 1 day in the future
hour, minutehour and minute will vary between two buildsadditionally the "future build" also runs 6h and 23min ahead
filesystem of the build directoryufssame for both builds
Filesystemtmpfssame for both builds (currently, this could be varied using disorderfs)
everything else...is likely the same. There will be more variations in the wild.

Artifacts for freebsd_main_git9aa02d512
freebsd_main_git9aa02d512 failed to build from source.

commit 9aa02d5120ab02bcbbc16fddb63e575df4ed6f61
Author: Mihai Burcea 
Date:   Thu Jun 30 16:11:17 2022 -0700

    vmm: Fix snapshots for AMD CPUs
    
    This patch fixes the AMD implementation for snapshotting.  It removes
    unnecessary vmcb fields that should not be saved and duplicates.
    
    Reviewed by:    jhb
    Differential Revision: https://reviews.freebsd.org/D33431