$ git clone -n https://src.fedoraproject.org/rpms/b43-tools.git /var/lib/mock/f40-build-1991428-43499/root/chroot_tmpdir/scmroot/b43-tools
Cloning into '/var/lib/mock/f40-build-1991428-43499/root/chroot_tmpdir/scmroot/b43-tools'...
$ git fetch origin 0b1b86c39a7167bb3e9c858fda56a2a12a68ff59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/b43-tools
 * [new ref]         0b1b86c39a7167bb3e9c858fda56a2a12a68ff59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b1b86c Add missing python3-setuptools buildrequires (rhbz#2154788)