$ git clone -n https://src.fedoraproject.org/rpms/bsf.git /var/lib/mock/f40-build-2065569-49264/root/chroot_tmpdir/scmroot/bsf
Cloning into '/var/lib/mock/f40-build-2065569-49264/root/chroot_tmpdir/scmroot/bsf'...
$ git fetch origin 936e1f6c0915f46b073e914651c242eaea2484f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bsf
 * [new ref]         936e1f6c0915f46b073e914651c242eaea2484f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 936e1f6 Update javapackages test plan to f40