$ git clone -n https://src.fedoraproject.org/rpms/bsf.git /var/lib/mock/f41-build-side-1-2908192-34733/root/chroot_tmpdir/scmroot/bsf
Cloning into '/var/lib/mock/f41-build-side-1-2908192-34733/root/chroot_tmpdir/scmroot/bsf'...
$ git fetch origin 4fdaa19477b965e14c8b07e1294d1478d147a5b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bsf
 * [new ref]         4fdaa19477b965e14c8b07e1294d1478d147a5b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fdaa19 Switch javapackages tests to f41 branch