[...]

 --without tests
from available:
--with   :	 bootstrap tests
--without:	 doc python2 python3
Available branches: master
Searching for tag auto/ti/python-pbr-4.0.4-1...
Searching for tag auto/ti/python-pbr-4_0_4-1...
--2018-08-24 21:03:37--  http://distfiles.pld-linux.org/distfiles/by-md5/0/0/000aac4d2bae0d8a9bc53b08634797c5/pbr-4.0.4.tar.gz
Resolving distfiles.pld-linux.org (distfiles.pld-linux.org)... 193.239.45.41
Connecting to distfiles.pld-linux.org (distfiles.pld-linux.org)|193.239.45.41|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 109077 (107K) [application/x-gzip]
Saving to: 'pbr-4.0.4.tar.gz'
     0K .......... .......... .......... .......... .......... 46% 1.21M 0s
    50K .......... .......... .......... .......... .......... 93% 2.41M 0s
   100K ......                                                100% 12437G=0.06s
2018-08-24 21:03:37 (1.71 MB/s) - 'pbr-4.0.4.tar.gz' saved [109077/109077]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/python-pbr-4.0.4-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 9264f4e - updated URLs and dependencies
fatal: HEAD does not point to a branch
Building python-pbr.spec with the following conditional flags:
 --without tests
from available:
--with   :	 bootstrap tests
--without:	 doc python2 python3
Writing git revision for tag auto/ti/python-pbr-4.0.4-1
On detached HEAD. Use -r BRANCHNAME to override
error: Macro %_builddir has empty body
error: Macro %_builddir has empty body
Executing(--clean): env -i TMP=/home/users/builder/tmp HOME=/home/users/builder PATH=/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin TMPDIR=/home/users/builder/tmp  /bin/sh -e /home/users/builder/tmp/rpm-tmp.63995
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf pbr-4.0.4
Begin-TLD-Builder-Info
Build-Time: user:0.64s sys:0.05s real:2.17s (faults io:0 non-io:106405)
Files queued for ftp:
    115948 python-pbr-4.0.4-1.src.rpm
       188 python-pbr-4.0.4-1.src.rpm.uploadinfo
End-TLD-Builder-Info