$ git clone -n https://src.fedoraproject.org/rpms/perl-Time-Clock.git /var/lib/mock/f45-build-27176-621/root/chroot_tmpdir/scmroot/perl-Time-Clock
Cloning into '/var/lib/mock/f45-build-27176-621/root/chroot_tmpdir/scmroot/perl-Time-Clock'...
$ git fetch origin 24138d2bd5d709f90344312f3f798efd27ee4aa1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Time-Clock
 * [new ref]         24138d2bd5d709f90344312f3f798efd27ee4aa1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24138d2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild