$ git clone -n https://src.fedoraproject.org/rpms/perl-Mo.git /var/lib/mock/f45-build-24780-606/root/chroot_tmpdir/scmroot/perl-Mo
Cloning into '/var/lib/mock/f45-build-24780-606/root/chroot_tmpdir/scmroot/perl-Mo'...
$ git fetch origin 4cbc70e9d95eefdd9ee1b81adc66be7385514cdf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mo
 * [new ref]         4cbc70e9d95eefdd9ee1b81adc66be7385514cdf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cbc70e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild