$ git clone -n https://src.fedoraproject.org/rpms/kgamma.git /var/lib/mock/f40-build-2126048-50780/root/chroot_tmpdir/scmroot/kgamma
Cloning into '/var/lib/mock/f40-build-2126048-50780/root/chroot_tmpdir/scmroot/kgamma'...
$ git fetch origin 99da5c49f1e1f6ff541e7b420ca4846738992cf5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kgamma
 * [new ref]         99da5c49f1e1f6ff541e7b420ca4846738992cf5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99da5c4 5.91.0