[...]

  git checkout -b new_branch_name
HEAD is now at f20b1b6... - updated to 6.10.2 - removed obsolete xserver-1.19 patch
fatal: HEAD does not point to a branch
Available branches: master
Searching for tag auto/ti/xorg-driver-video-r128-6.10.2-2...
Searching for tag auto/ti/xorg-driver-video-r128-6_10_2-2...
--2018-03-15 09:18:38--  http://distfiles.pld-linux.org/distfiles/by-md5/9/0/905758eb0711bf7151c4f6c435757426/xf86-video-r128-6.10.2.tar.bz2
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: 504031 (492K) [application/x-bzip2]
Saving to: 'xf86-video-r128-6.10.2.tar.bz2'
     0K .......... .......... .......... .......... .......... 10% 1.21M 0s
    50K .......... .......... .......... .......... .......... 20% 2.39M 0s
   100K .......... .......... .......... .......... .......... 30% 92.7M 0s
   150K .......... .......... .......... .......... .......... 40% 48.7M 0s
   200K .......... .......... .......... .......... .......... 50% 2.58M 0s
   250K .......... .......... .......... .......... .......... 60%  110M 0s
   300K .......... .......... .......... .......... .......... 71% 79.1M 0s
   350K .......... .......... .......... .......... .......... 81% 60.4M 0s
   400K .......... .......... .......... .......... .......... 91% 2.68M 0s
   450K .......... .......... .......... .......... ..        100%  104M=0.1s
2018-03-15 09:18:38 (4.73 MB/s) - 'xf86-video-r128-6.10.2.tar.bz2' saved [504031/504031]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-driver-video-r128-6.10.2-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at f20b1b6... - updated to 6.10.2 - removed obsolete xserver-1.19 patch
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/xorg-driver-video-r128-6.10.2-2
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.39173
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf xf86-video-r128-6.10.2
Begin-TLD-Builder-Info
Build-Time: user:0.62s sys:0.15s real:2.27s (faults io:0 non-io:94056)
Files queued for ftp:
    509964 xorg-driver-video-r128-6.10.2-2.src.rpm
       201 xorg-driver-video-r128-6.10.2-2.src.rpm.uploadinfo
End-TLD-Builder-Info