$ git clone -n https://src.fedoraproject.org/rpms/binutils.git /var/lib/mock/f42-build-3365656-45047/root/chroot_tmpdir/scmroot/binutils
Cloning into '/var/lib/mock/f42-build-3365656-45047/root/chroot_tmpdir/scmroot/binutils'...
$ git fetch origin 09de9a498ef6408fab6293064f670efc675ad0bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/binutils
 * [new ref]         09de9a498ef6408fab6293064f670efc675ad0bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09de9a4 Renumber patches