[...]

changes and commit them, and you can discard any commits you make in this
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 69f1940... - updated to 7.0.28
fatal: HEAD does not point to a branch
Available branches: master
--2015-07-28 11:51:14--  http://distfiles.pld-linux.org/distfiles/by-md5/3/c/3ce2f230c5d8fa929f326ad1f0fa40a8/xproto-7.0.28.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: 300886 (294K) [application/x-bzip2]
Saving to: 'xproto-7.0.28.tar.bz2'
     0K .......... .......... .......... .......... .......... 17%  784K 0s
    50K .......... .......... .......... .......... .......... 34% 1.46M 0s
   100K .......... .......... .......... .......... .......... 51% 1.51M 0s
   150K .......... .......... .......... .......... .......... 68% 1.59M 0s
   200K .......... .......... .......... .......... .......... 85% 11.5M 0s
   250K .......... .......... .......... .......... ...       100% 1.53M=0.2s
2015-07-28 11:51:15 (1.49 MB/s) - 'xproto-7.0.28.tar.bz2' saved [300886/300886]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-proto-xproto-7.0.28-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 69f1940... - updated to 7.0.28
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/xorg-proto-xproto-7.0.28-1
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.71937
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf xproto-7.0.28
Begin-PLD-Builder-Info
Build-Time: user:2.68s sys:1.25s real:4.95s (faults io:0 non-io:190220)
Files queued for ftp:
    305245 xorg-proto-xproto-7.0.28-1.src.rpm
       196 xorg-proto-xproto-7.0.28-1.src.rpm.uploadinfo
End-PLD-Builder-Info