$ git clone -n https://src.fedoraproject.org/rpms/bigloo.git /var/lib/mock/f40-build-2250805-54083/root/chroot_tmpdir/scmroot/bigloo
Cloning into '/var/lib/mock/f40-build-2250805-54083/root/chroot_tmpdir/scmroot/bigloo'...
$ git fetch origin 9a75c302ada94c9fd9a81e3e0652784f84c59b38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bigloo
 * [new ref]         9a75c302ada94c9fd9a81e3e0652784f84c59b38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a75c30 Version 4.5b