[...]

  git checkout -b new_branch_name
HEAD is now at 7e9c0b8... - updated to 0.30.0
fatal: HEAD does not point to a branch
Available branches: master
--2015-07-28 11:50:23--  http://distfiles.pld-linux.org/distfiles/by-md5/3/a/3ab2bccf356999f1a96d03deba155bc3/xf86-input-wacom-0.30.0.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: 591648 (578K) [application/x-bzip2]
Saving to: 'xf86-input-wacom-0.30.0.tar.bz2'
     0K .......... .......... .......... .......... ..........  8%  785K 1s
    50K .......... .......... .......... .......... .......... 17% 1.48M 0s
   100K .......... .......... .......... .......... .......... 25% 1.51M 0s
   150K .......... .......... .......... .......... .......... 34% 1.58M 0s
   200K .......... .......... .......... .......... .......... 43% 10.0M 0s
   250K .......... .......... .......... .......... .......... 51% 1.89M 0s
   300K .......... .......... .......... .......... .......... 60% 7.51M 0s
   350K .......... .......... .......... .......... .......... 69% 11.2M 0s
   400K .......... .......... .......... .......... .......... 77% 1.83M 0s
   450K .......... .......... .......... .......... .......... 86% 16.1M 0s
   500K .......... .......... .......... .......... .......... 95% 10.8M 0s
   550K .......... .......... .......                         100% 12.1M=0.2s
2015-07-28 11:50:24 (2.37 MB/s) - 'xf86-input-wacom-0.30.0.tar.bz2' saved [591648/591648]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-driver-input-wacom-0.30.0-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 7e9c0b8... - updated to 0.30.0
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/xorg-driver-input-wacom-0.30.0-1
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.83500
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf xf86-input-wacom-0.30.0
Begin-PLD-Builder-Info
Build-Time: user:3.61s sys:1.74s real:12.27s (faults io:0 non-io:191748)
Files queued for ftp:
    597167 xorg-driver-input-wacom-0.30.0-1.src.rpm
       202 xorg-driver-input-wacom-0.30.0-1.src.rpm.uploadinfo
End-PLD-Builder-Info