$ git clone -n https://src.fedoraproject.org/rpms/perl-Return-Value.git /var/lib/mock/f45-build-25989-614/root/chroot_tmpdir/scmroot/perl-Return-Value
Cloning into '/var/lib/mock/f45-build-25989-614/root/chroot_tmpdir/scmroot/perl-Return-Value'...
$ git fetch origin 83409fbe6b168f5e83efc017cad203e0cdaf0845:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Return-Value
 * [new ref]         83409fbe6b168f5e83efc017cad203e0cdaf0845 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83409fb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild