$ git clone -n https://src.fedoraproject.org/rpms/bcel.git /var/lib/mock/f40-build-2403488-60556/root/chroot_tmpdir/scmroot/bcel
Cloning into '/var/lib/mock/f40-build-2403488-60556/root/chroot_tmpdir/scmroot/bcel'...
$ git fetch origin 87ff5c61abea2407abc35c7b2c89ef71b3672dd9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bcel
 * [new ref]         87ff5c61abea2407abc35c7b2c89ef71b3672dd9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87ff5c6 Update to upstream version 6.8.1