$ git clone -n https://src.fedoraproject.org/rpms/rpmreaper.git /var/lib/mock/f45-build-34670-690/root/chroot_tmpdir/scmroot/rpmreaper
Cloning into '/var/lib/mock/f45-build-34670-690/root/chroot_tmpdir/scmroot/rpmreaper'...
$ git fetch origin 7cc64b0b40e27590298c55de16dc861915b7e336:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpmreaper
 * [new ref]         7cc64b0b40e27590298c55de16dc861915b7e336 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cc64b0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild