[...]

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 a70eedc - fix install
fatal: HEAD does not point to a branch
Available branches: master
Searching for tag auto/ti/sysstat-10.1.6-7...
Searching for tag auto/ti/sysstat-10_1_6-7...
--2018-05-09 09:37:58--  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% 22.7M 0s
    50K .......... .......... .......... .......... .......... 33% 51.3M 0s
   100K .......... .......... .......... .......... .......... 50% 90.3M 0s
   150K .......... .......... .......... .......... .......... 67% 98.3M 0s
   200K .......... .......... .......... .......... .......... 84%  143M 0s
   250K .......... .......... .......... .......... ....      100% 67.5M=0.005s
2018-05-09 09:37:58 (56.1 MB/s) - 'sysstat-10.1.6.tar.bz2' saved [301218/301218]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/sysstat-10.1.6-7.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at a70eedc - fix install
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/sysstat-10.1.6-7
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.28658
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf sysstat-10.1.6
Begin-TLD-Builder-Info
Build-Time: user:0.79s sys:0.25s real:2.63s (faults io:0 non-io:111876)
Files queued for ftp:
    309603 sysstat-10.1.6-7.src.rpm
       186 sysstat-10.1.6-7.src.rpm.uploadinfo
End-TLD-Builder-Info