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 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 master branch of freebsd.git. The jenkins job is running, which via ssh triggers a build on a FreeBSD 11.2 system and this script is solely responsible for creating this page. Feel invited to join #reproducible-builds (on 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 2020-04-02 for the branch master at commit 471c4e6b0 using diffoscope 137.

variationfirst buildsecond build
hostname osuosl-build169-amd64 or osuosl-build170-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, dateosuosl-build171-amd64: today (2020-04-02) or osuosl-build172-amd64: 398 days in the future (2021-05-05)the other one
year, month, datetoday (2020-04-02)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 likely the same. There will be more variations in the wild.

Artifacts for freebsd_master_git471c4e6b0
freebsd_master_git471c4e6b0 failed to build from source.

commit 471c4e6b0bc9133d66b6b29d7856a34e229ac736
Author: emaste 
Date:   Thu Apr 2 21:08:28 2020 +0000

    lldb: use lua as the default script language
    In the FreeBSD base system we do not have Python support in lldb, but
    will have Lua support.  Make Lua the default.
    This needs to be made into a configure-time option; that is being
    discussed upstream and will appear in a future lldb import.  For now
    carry this change as a tiny patch to our copy of lldb.