[...]

state without impacting any branches by performing another checkout.
If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:
  git checkout -b new_branch_name
HEAD is now at 70995e4... - updated to 1.5.0
fatal: HEAD does not point to a branch
Available branches: master
--2015-07-28 11:50:56--  http://distfiles.pld-linux.org/distfiles/by-md5/3/0/309762867e41c6fd813da880d8a1bc93/libXrandr-1.5.0.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: 314603 (307K) [application/x-bzip2]
Saving to: 'libXrandr-1.5.0.tar.bz2'
     0K .......... .......... .......... .......... .......... 16%  778K 0s
    50K .......... .......... .......... .......... .......... 32% 1.47M 0s
   100K .......... .......... .......... .......... .......... 48% 1.52M 0s
   150K .......... .......... .......... .......... .......... 65% 1.62M 0s
   200K .......... .......... .......... .......... .......... 81% 11.4M 0s
   250K .......... .......... .......... .......... .......... 97% 1.69M 0s
   300K .......                                               100% 14.0M=0.2s
2015-07-28 11:50:56 (1.55 MB/s) - 'libXrandr-1.5.0.tar.bz2' saved [314603/314603]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-lib-libXrandr-1.5.0-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 70995e4... - updated to 1.5.0
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/xorg-lib-libXrandr-1.5.0-1
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.45264
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libXrandr-1.5.0
Begin-PLD-Builder-Info
Build-Time: user:2.72s sys:1.38s real:10.21s (faults io:0 non-io:190179)
Files queued for ftp:
    320159 xorg-lib-libXrandr-1.5.0-1.src.rpm
       196 xorg-lib-libXrandr-1.5.0-1.src.rpm.uploadinfo
End-PLD-Builder-Info