$ git clone -n https://src.fedoraproject.org/rpms/kdegraphics-thumbnailers.git /var/lib/mock/f42-build-870990-177453/root/chroot_tmpdir/scmroot/kdegraphics-thumbnailers
Cloning into '/var/lib/mock/f42-build-870990-177453/root/chroot_tmpdir/scmroot/kdegraphics-thumbnailers'...
$ git fetch origin 3f46b183b32f4e31e670ebe7709a4a58588d6663:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdegraphics-thumbnailers
 * [new ref]         3f46b183b32f4e31e670ebe7709a4a58588d6663 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f46b18 24.12.2