$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Round.git /var/lib/mock/f40-build-2202294-51870/root/chroot_tmpdir/scmroot/perl-Math-Round
Cloning into '/var/lib/mock/f40-build-2202294-51870/root/chroot_tmpdir/scmroot/perl-Math-Round'...
$ git fetch origin 0ed481e0ea9c4005fd18ae552f42cf9a4bb458c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Round
 * [new ref]         0ed481e0ea9c4005fd18ae552f42cf9a4bb458c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ed481e Update to 0.08