$ git clone -n https://src.fedoraproject.org/rpms/binutils.git /var/lib/mock/f41-build-side-1-2749752-31005/root/chroot_tmpdir/scmroot/binutils
Cloning into '/var/lib/mock/f41-build-side-1-2749752-31005/root/chroot_tmpdir/scmroot/binutils'...
$ git fetch origin 8e380e50cb2ec02caf6eddc75f8c34382b2d9478:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/binutils
 * [new ref]         8e380e50cb2ec02caf6eddc75f8c34382b2d9478 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e380e5 Rebase to commit c839a44c391