$ git clone -n https://src.fedoraproject.org/rpms/sblg.git /var/lib/mock/f42-build-3421869-45166/root/chroot_tmpdir/scmroot/sblg
Cloning into '/var/lib/mock/f42-build-3421869-45166/root/chroot_tmpdir/scmroot/sblg'...
$ git fetch origin dba7c227eac6a4cfd8027ea4884fecbe03a89e8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sblg
 * [new ref]         dba7c227eac6a4cfd8027ea4884fecbe03a89e8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dba7c22 Initial import bz 2338432