$ git clone -n https://src.fedoraproject.org/rpms/perl-Olson-Abbreviations.git /var/lib/mock/f45-build-25443-611/root/chroot_tmpdir/scmroot/perl-Olson-Abbreviations
Cloning into '/var/lib/mock/f45-build-25443-611/root/chroot_tmpdir/scmroot/perl-Olson-Abbreviations'...
$ git fetch origin 6bf88de4b0825853a3fcbd478c6b4766723fa98a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Olson-Abbreviations
 * [new ref]         6bf88de4b0825853a3fcbd478c6b4766723fa98a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bf88de Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild