[...]

  git checkout -b new_branch_name
HEAD is now at 75000a6... - x32 rebuild - release 2 (by relup.sh)
fatal: HEAD does not point to a branch
Available branches: AC-branch RA-branch master
--2015-07-28 10:32:43--  http://distfiles.pld-linux.org/distfiles/by-md5/f/c/fcec64c26a0f4f4901468f360029678f/lzo-2.08.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: 589045 (575K) [application/x-gzip]
Saving to: 'lzo-2.08.tar.gz'
     0K .......... .......... .......... .......... ..........  8%  786K 1s
    50K .......... .......... .......... .......... .......... 17% 1.47M 0s
   100K .......... .......... .......... .......... .......... 26% 1.53M 0s
   150K .......... .......... .......... .......... .......... 34% 1.59M 0s
   200K .......... .......... .......... .......... .......... 43% 11.5M 0s
   250K .......... .......... .......... .......... .......... 52% 1.87M 0s
   300K .......... .......... .......... .......... .......... 60% 7.60M 0s
   350K .......... .......... .......... .......... .......... 69% 10.8M 0s
   400K .......... .......... .......... .......... .......... 78% 1.96M 0s
   450K .......... .......... .......... .......... .......... 86% 11.5M 0s
   500K .......... .......... .......... .......... .......... 95% 10.9M 0s
   550K .......... .......... .....                           100% 12.3M=0.2s
2015-07-28 10:32:43 (2.38 MB/s) - 'lzo-2.08.tar.gz' saved [589045/589045]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/lzo-2.08-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 75000a6... - x32 rebuild - release 2 (by relup.sh)
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/lzo-2.08-2
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.87802
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf lzo-2.08
Begin-PLD-Builder-Info
Build-Time: user:2.67s sys:1.23s real:10.00s (faults io:0 non-io:189639)
Files queued for ftp:
    595777 lzo-2.08-2.src.rpm
       180 lzo-2.08-2.src.rpm.uploadinfo
End-PLD-Builder-Info