$ git clone -n https://src.fedoraproject.org/rpms/perl-Meta-Builder.git /var/lib/mock/f45-build-24798-606/root/chroot_tmpdir/scmroot/perl-Meta-Builder
Cloning into '/var/lib/mock/f45-build-24798-606/root/chroot_tmpdir/scmroot/perl-Meta-Builder'...
$ git fetch origin ae85099feae26e59e1c5214e1c9c0694a7a35f1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Meta-Builder
 * [new ref]         ae85099feae26e59e1c5214e1c9c0694a7a35f1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae85099 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild