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 release/10.3.0 branch of freebsd.git. The jenkins job is running reproducible_freebsd.sh, which via ssh triggers a build on a FreeBSD 10.3 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 Profitbricks 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 2018-09-20 for the branch master at commit 253328ab5 using diffoscope 101.

variationfirst buildsecond build
hostname profitbricks-build3-amd64 or profitbricks-build4-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="fr_CH.UTF-8"
env LC_ALLnot setLC_ALL="fr_CH.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, dateprofitbricks-build3-amd64: today (2018-09-20) or profitbricks-build4-amd64: 398 days in the future (2019-10-23)the other one
year, month, datetoday (2018-09-20)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
everything else...is likely the same. There will be more variations in the wild.

Artifacts for freebsd_master_git253328ab5
freebsd_master_git253328ab5 failed to build from source.

commit 253328ab5c47970f74d87f223102fb10401c69d5
Author: mjg 
Date:   Thu Sep 20 20:32:08 2018 +0000

    amd64: macroify copyin/copyout and provide erms variants, follow up
    
    Fix a fat-fingered typo with a "funny" side-effect: when doing copyin on a
    cpu without ERMS and with size being a multiply of 8 a page fault would be
    triggered resulting in EFAULT.
    
    Pointy hat: mjg
    Approved by:    re (implicit)