$ git clone -n https://src.fedoraproject.org/rpms/airrac.git /var/lib/mock/f40-build-801037-143685/root/chroot_tmpdir/scmroot/airrac
Cloning into '/var/lib/mock/f40-build-801037-143685/root/chroot_tmpdir/scmroot/airrac'...
$ git fetch origin db9a16d010f1381036313b658a3b134259ba53cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/airrac
 * [new ref]         db9a16d010f1381036313b658a3b134259ba53cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db9a16d Upstream upgrade