＆QUOT;避灾＆QUOT; $执行从蟒蛇面料远程bash命令时， [英] "Escaping" $ when executing a remote bash command from python fabric

问题描述

所以，我想通过自动化的一个python脚本面料拱Linux实例的设立是这样的：

So I am trying to automate the set up of an arch linux instance via a python fabric script like this:

from fabric.api import run, sudo

def server_setup_communityrepo():
    run('echo \'echo "[archlinuxfr]" >> /etc/pacman.conf\' | sudo -s')
    run('echo \'echo "Server = http://repo.archlinux.fr/$arch" >> /etc/pacman.conf\' | sudo -s')
    run('echo \'echo " " >> /etc/pacman.conf\' | sudo -s')
    sudo('pacman -Syy yaourt --noconfirm')

第二出现问题的原因在 $拱 $符号的运行（）电话。这种面料功能，因为$后跟一个字符串由布公认的配置变线2失败。但其实我是想$拱在被理解为一个文字的

The problem occurs on the second run() call because of the $ sign in the $arch. This fabric function fails in line 2 because $ followed by a string is recognized by fabric as a config variable. But I actually want $arch to be understood as a literal in the

回声回声服务器= http://repo.archlinux.fr/$arch＆GT;＆GT; /etc/pacman.conf中在bash shell中调用。

echo 'echo "Server = http://repo.archlinux.fr/$arch" >> /etc/pacman.conf' call in bash shell.

我如何从这种面料怪癖越狱并指定$拱照字面被写入到我的pacman.conf的文件？

How do I "escape" from this fabric quirk and designate the $arch as a literal to be written into my pacman.conf file?

推荐答案

使用回声单引号。这将prevent从扩大 $拱的外壳。

use echo with single quotes. That will prevent the shell from expanding $arch.

run('echo \'Server = http://repo.archlinux.fr/$arch\' | sudo -s tee -a /etc/pacman.conf')

这应该是等同于

echo 'Server = http://repo.archlinux.fr/$arch' | sudo -s tee -a /etc/pacman.conf

---

快速测试：

---

quick testing:

>>> import os
>>> os.system('echo \'Server = /foo/$arch\' ')
Server = /foo/$arch
0

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