$ git clone -n https://src.fedoraproject.org/rpms/libXrender.git /var/lib/mock/f45-build-15789-479/root/chroot_tmpdir/scmroot/libXrender
Cloning into '/var/lib/mock/f45-build-15789-479/root/chroot_tmpdir/scmroot/libXrender'...
$ git fetch origin 280db7022b9777acfad3c307ee947485768a55b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXrender
 * [new ref]         280db7022b9777acfad3c307ee947485768a55b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 280db70 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild