[...]

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 81d2bfd - release 2 (by relup.sh)
fatal: HEAD does not point to a branch
Available branches: AC-branch RA-branch master
Searching for tag auto/ti/yodl-3.00.0-2...
Searching for tag auto/ti/yodl-3_00_0-2...
--2018-09-03 12:03:52--  http://distfiles.pld-linux.org/distfiles/by-md5/8/0/804703769e7995e25f5f5dd59ca3377c/yodl_3.00.0.orig.tar.gz
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: 294797 (288K) [application/x-gzip]
Saving to: 'yodl_3.00.0.orig.tar.gz'
     0K .......... .......... .......... .......... .......... 17% 1.20M 0s
    50K .......... .......... .......... .......... .......... 34% 2.48M 0s
   100K .......... .......... .......... .......... .......... 52% 39.0M 0s
   150K .......... .......... .......... .......... .......... 69%  432M 0s
   200K .......... .......... .......... .......... .......... 86% 2.57M 0s
   250K .......... .......... .......... .......              100% 52.9M=0.08s
2018-09-03 12:03:52 (3.46 MB/s) - 'yodl_3.00.0.orig.tar.gz' saved [294797/294797]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/yodl-3.00.0-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 81d2bfd - release 2 (by relup.sh)
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/yodl-3.00.0-2
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.18935
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf yodl-3.00.0
Begin-TLD-Builder-Info
Build-Time: user:0.54s sys:0.04s real:1.86s (faults io:0 non-io:90034)
Files queued for ftp:
    300600 yodl-3.00.0-2.src.rpm
       183 yodl-3.00.0-2.src.rpm.uploadinfo
End-TLD-Builder-Info