$ git clone -n https://src.fedoraproject.org/rpms/unbound.git /var/lib/mock/f45-build-37690-717/root/chroot_tmpdir/scmroot/unbound
Cloning into '/var/lib/mock/f45-build-37690-717/root/chroot_tmpdir/scmroot/unbound'...
$ git fetch origin 6ba39990468c3c6bcb1c82a475c067172cff0009:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unbound
 * [new ref]         6ba39990468c3c6bcb1c82a475c067172cff0009 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ba3999 Update to 1.26.1 (rhbz#2535076)