$ git clone -n https://src.fedoraproject.org/rpms/libXxf86vm.git /var/lib/mock/f45-build-15805-479/root/chroot_tmpdir/scmroot/libXxf86vm
Cloning into '/var/lib/mock/f45-build-15805-479/root/chroot_tmpdir/scmroot/libXxf86vm'...
$ git fetch origin fde017f2a0b81cac619d4c5f7c1d9bc8e24a1f26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXxf86vm
 * [new ref]         fde017f2a0b81cac619d4c5f7c1d9bc8e24a1f26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fde017f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild