fabricで鍵認証をセットする ref: http://qiita.com/mather314/items/d8db37ab6aaaaccdabba

file0.py

from fabric.api import *

@task
def copy_id(file="~/.ssh/id_rsa.pub"):
    """Identityをauthorized_keysに追加する"""
    put(file, "/tmp/id.pub")
    try:
        run("if [ ! -d ~/.ssh ]; then mkdir -p ~/.ssh; fi")
        run("if [ ! -f ~/.ssh/authorized_keys ]; then cp /tmp/id.pub ~/.ssh/authorized_keys && chmod 0600 ~/.ssh/authorized_keys; fi")
        run("cat ~/.ssh/authorized_keys /tmp/id.pub | sort -u > /tmp/uniq.authorized_keys")
        run("if [ `cat ~/.ssh/authorized_keys | wc -l` -lt `cat /tmp/uniq.authorized_keys | wc -l` ]; then cat /tmp/id.pub >> ~/.ssh/authorized_keys; fi")
    finally:
        run("rm -f /tmp/id.pub /tmp/uniq.authorized_keys")

file1.txt

fab -H target copy_id:file=~/.ssh/custom_id.pub