[...]

  git checkout -b new_branch_name
HEAD is now at 8821dfd... - up to 1.5.2
fatal: HEAD does not point to a branch
Available branches: master
Searching for tag auto/ti/xorg-lib-libXfont-1.5.2-1...
Searching for tag auto/ti/xorg-lib-libXfont-1_5_2-1...
--2017-04-13 07:25:58--  http://distfiles.pld-linux.org/distfiles/by-md5/2/5/254ee42bd178d18ebc7a73aacfde7f79/libXfont-1.5.2.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: 530367 (518K) [application/x-bzip2]
Saving to: 'libXfont-1.5.2.tar.bz2'
     0K .......... .......... .......... .......... ..........  9% 1.05M 0s
    50K .......... .......... .......... .......... .......... 19% 2.10M 0s
   100K .......... .......... .......... .......... .......... 28%  236M 0s
   150K .......... .......... .......... .......... .......... 38%  109M 0s
   200K .......... .......... .......... .......... .......... 48% 2.14M 0s
   250K .......... .......... .......... .......... .......... 57% 91.9M 0s
   300K .......... .......... .......... .......... .......... 67%  321M 0s
   350K .......... .......... .......... .......... .......... 77%  106M 0s
   400K .......... .......... .......... .......... .......... 86% 2.22M 0s
   450K .......... .......... .......... .......... .......... 96%  119M 0s
   500K .......... .......                                    100%  179M=0.1s
2017-04-13 07:25:59 (4.34 MB/s) - 'libXfont-1.5.2.tar.bz2' saved [530367/530367]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-lib-libXfont-1.5.2-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 8821dfd... - up to 1.5.2
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/xorg-lib-libXfont-1.5.2-1
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.54759
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libXfont-1.5.2
Begin-TLD-Builder-Info
Build-Time: user:0.58s sys:0.18s real:1.95s (faults io:0 non-io:90832)
Files queued for ftp:
    537152 xorg-lib-libXfont-1.5.2-1.src.rpm
       195 xorg-lib-libXfont-1.5.2-1.src.rpm.uploadinfo
End-TLD-Builder-Info