$ git clone -n https://src.fedoraproject.org/rpms/kgamma.git /var/lib/mock/f41-build-851938-166154/root/chroot_tmpdir/scmroot/kgamma
Cloning into '/var/lib/mock/f41-build-851938-166154/root/chroot_tmpdir/scmroot/kgamma'...
$ git fetch origin 0068fdede28bbcb8869ed040bf2bf6b979a659b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kgamma
 * [new ref]         0068fdede28bbcb8869ed040bf2bf6b979a659b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0068fde 6.1.90