$ git clone -n https://src.fedoraproject.org/rpms/perl-Frontier-RPC.git /var/lib/mock/f45-build-23659-598/root/chroot_tmpdir/scmroot/perl-Frontier-RPC
Cloning into '/var/lib/mock/f45-build-23659-598/root/chroot_tmpdir/scmroot/perl-Frontier-RPC'...
$ git fetch origin 69120e034d98473ab01b2b055b105568ab3e4e11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Frontier-RPC
 * [new ref]         69120e034d98473ab01b2b055b105568ab3e4e11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69120e0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild