$ git clone -n https://src.fedoraproject.org/rpms/perl-Dispatch-Class.git /var/lib/mock/f45-build-23205-596/root/chroot_tmpdir/scmroot/perl-Dispatch-Class
Cloning into '/var/lib/mock/f45-build-23205-596/root/chroot_tmpdir/scmroot/perl-Dispatch-Class'...
$ git fetch origin 4fdf290ec7528d45b7b79eaa00703a216a076a17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Dispatch-Class
 * [new ref]         4fdf290ec7528d45b7b79eaa00703a216a076a17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fdf290 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild