$ git clone -n https://src.fedoraproject.org/rpms/libglvnd.git /var/lib/mock/f45-build-16261-484/root/chroot_tmpdir/scmroot/libglvnd
Cloning into '/var/lib/mock/f45-build-16261-484/root/chroot_tmpdir/scmroot/libglvnd'...
$ git fetch origin 8a0f9b02803bc2123387f0bd671d784d72dba6dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libglvnd
 * [new ref]         8a0f9b02803bc2123387f0bd671d784d72dba6dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a0f9b0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild