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 2018-05-17 for the branch master at commit 1625a5106 using diffoscope 94.

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 (2018-05-17) or profitbricks-build4-amd64: 398 days in the future (2019-06-19)the other one
year, month, datetoday (2018-05-17)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_git1625a5106
freebsd_master_git1625a5106 failed to build from source.

commit 1625a51062b8fb7d202638a8ce0a5c472484bc2c
Author: brooks 
Date:   Thu May 17 23:07:51 2018 +0000

    Use strsep() to parse init_path in start_init().
    
    This simplifies the use of the path variable by making it NUL
    terminated.  This is a prerequisite for further cleanups.
    
    Reviewed by:    imp
    Sponsored by:   DARPA, AFRL
    Differential Revision:  https://reviews.freebsd.org/D15467