$ git clone -n https://src.fedoraproject.org/rpms/byteman.git /var/lib/mock/f39-build-2074583-49409/root/chroot_tmpdir/scmroot/byteman
Cloning into '/var/lib/mock/f39-build-2074583-49409/root/chroot_tmpdir/scmroot/byteman'...
$ git fetch origin 8d1e10f3a014f5680b5575e44b5f32ade9a6624e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/byteman
 * [new ref]         8d1e10f3a014f5680b5575e44b5f32ade9a6624e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d1e10f Build with Java 17