[...]

 14100K .......... .......... .......... .......... .......... 94% 24.8M 0s
 14150K .......... .......... .......... .......... .......... 94%  231M 0s
 14200K .......... .......... .......... .......... .......... 95%  239M 0s
 14250K .......... .......... .......... .......... .......... 95% 30.2M 0s
 14300K .......... .......... .......... .......... .......... 95%  267M 0s
 14350K .......... .......... .......... .......... .......... 96%  231M 0s
 14400K .......... .......... .......... .......... .......... 96% 17.7M 0s
 14450K .......... .......... .......... .......... .......... 96%  240M 0s
 14500K .......... .......... .......... .......... .......... 97% 70.0M 0s
 14550K .......... .......... .......... .......... .......... 97%  253M 0s
 14600K .......... .......... .......... .......... .......... 97%  248M 0s
 14650K .......... .......... .......... .......... .......... 98%  260M 0s
 14700K .......... .......... .......... .......... .......... 98%  247M 0s
 14750K .......... .......... .......... .......... .......... 98%  281M 0s
 14800K .......... .......... .......... .......... .......... 99%  289M 0s
 14850K .......... .......... .......... .......... .......... 99%  264M 0s
 14900K .......... .......... .......... .......... .......... 99%  245M 0s
 14950K .......... .......... .......... ......               100%  302M=0.4s
2017-10-18 18:47:33 (38.2 MB/s) - 'go1.8.3.src.tar.gz' saved [15345996/15345996]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/golang-1.8.3-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 827674f... - fixed bootstrap build
fatal: HEAD does not point to a branch
Building golang.spec with the following conditional flags:
 --with bootstrap
from available:
--with   :	
--without:	 bootstrap cgo ext_linker shared tests verbose
Writing git revision for tag auto/ti/golang-1.8.3-2
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.95522
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf golang-1.8.3
Begin-TLD-Builder-Info
Build-Time: user:1.37s sys:0.43s real:3.26s (faults io:0 non-io:109769)
Files queued for ftp:
  15270465 golang-1.8.3-2.src.rpm
       184 golang-1.8.3-2.src.rpm.uploadinfo
End-TLD-Builder-Info