$ git clone -n https://src.fedoraproject.org/rpms/seabios.git /var/lib/mock/f39-build-1908767-42872/root/chroot_tmpdir/scmroot/seabios
Cloning into '/var/lib/mock/f39-build-1908767-42872/root/chroot_tmpdir/scmroot/seabios'...
$ git fetch origin fd2837d04f81c23c703866bfd32e68b2e51a3cce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/seabios
 * [new ref]         fd2837d04f81c23c703866bfd32e68b2e51a3cce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd2837d Update 1.16.3 release