[...]

th prefix: auto/ti/
HEAD is now at 34afcf9... - up to 1.8.3
fatal: HEAD does not point to a branch
Building golang.spec with the following conditional flags:
 --with bootstrap
from available:
--with   :	
--without:	 cgo ext_linker shared tests verbose
Writing git revision for tag auto/ti/golang-1.8.3-1
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.35077
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf golang-1.8.3
Begin-TLD-Builder-Info
Build-Time: user:1.41s sys:0.45s real:3.42s (faults io:0 non-io:110588)
Files queued for ftp:
  15270370 golang-1.8.3-1.src.rpm
       184 golang-1.8.3-1.src.rpm.uploadinfo
End-TLD-Builder-Info