[...]

do so (now or later) by using -b with the checkout command again. Example:
  git checkout -b new_branch_name
HEAD is now at f4b709c... - up to 0.8.7
error: HEAD does not point to a branch
fatal: @{u} - not something we can merge
Available branches: master
Searching for tag auto/ti/gdisk-0.8.7-1...
Searching for tag auto/ti/gdisk-0_8_7-1...
--2014-04-18 08:54:47--  http://distfiles.pld-linux.org/distfiles/by-md5/0/0/005b45c0b37c37a99024704fdb2ee610/gptfdisk-0.8.7.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: 187010 (183K) [application/x-gzip]
Saving to: 'gptfdisk-0.8.7.tar.gz'
     0K .......... .......... .......... .......... .......... 27% 1.07M 0s
    50K .......... .......... .......... .......... .......... 54%  728K 0s
   100K .......... .......... .......... .......... .......... 82%  730K 0s
   150K .......... .......... .......... ..                   100%  718K=0.2s
2014-04-18 08:54:47 (799 KB/s) - 'gptfdisk-0.8.7.tar.gz' saved [187010/187010]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/gdisk-0.8.7-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Version: 0.8.7
Release: 1
tag: auto/ti/gdisk-0.8.7-1
Searching for tag auto/ti/gdisk-0.8.7-1...
Failed to add the host to the list of known hosts (/home/users/builder/.ssh/known_hosts).
To ssh://git@git.pld-linux.org/packages/gdisk
 * [new tag]         auto/ti/gdisk-0.8.7-1 -> auto/ti/gdisk-0.8.7-1
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 PATH=/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin HOME=/home/users/builder TMPDIR=/home/users/builder/tmp  /bin/sh -e /home/users/builder/tmp/rpm-tmp.57911
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf gptfdisk-0.8.7
Begin-PLD-Builder-Info
Build-Time: user:0.52s sys:0.09s real:4.56s (faults io:0 non-io:161909)
Files queued for ftp:
    192952 gdisk-0.8.7-1.src.rpm
       183 gdisk-0.8.7-1.src.rpm.uploadinfo
End-PLD-Builder-Info