[...]

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 9c498c2... - release 6
fatal: HEAD does not point to a branch
Available branches: master
--2015-07-30 08:39:33--  http://df.tld-linux.org/distfiles/by-md5/6/1/61792b2591e4b3adcb7b979af2330fba/sysstat-10.1.6.tar.bz2
Resolving df.tld-linux.org (df.tld-linux.org)... 46.4.78.55
Connecting to df.tld-linux.org (df.tld-linux.org)|46.4.78.55|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 301218 (294K) [application/x-bzip2]
Saving to: 'sysstat-10.1.6.tar.bz2'
     0K .......... .......... .......... .......... .......... 16% 1.40M 0s
    50K .......... .......... .......... .......... .......... 33% 2.96M 0s
   100K .......... .......... .......... .......... .......... 50% 10.2M 0s
   150K .......... .......... .......... .......... .......... 67% 11.5M 0s
   200K .......... .......... .......... .......... .......... 84% 4.19M 0s
   250K .......... .......... .......... .......... ....      100% 11.5M=0.08s
2015-07-30 08:39:33 (3.79 MB/s) - 'sysstat-10.1.6.tar.bz2' saved [301218/301218]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/sysstat-10.1.6-6.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 9c498c2... - release 6
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/sysstat-10.1.6-6
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.73023
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf sysstat-10.1.6
Begin-PLD-Builder-Info
Build-Time: user:2.69s sys:1.31s real:4.47s (faults io:0 non-io:217072)
Files queued for ftp:
    309210 sysstat-10.1.6-6.src.rpm
       186 sysstat-10.1.6-6.src.rpm.uploadinfo
End-PLD-Builder-Info