面料“失败”不起作用

Question

我想做一些简单的事情，例如检查文件中是否可以找到字符串，如果没有，则执行某些操作。 Fabric退出时出错。有什么解决方法吗？

result = local("grep %s /tmp/file" % env.hosts[0])
if result.failed:
    print "shit failed"
else:
    print "was already added, noop!"

输出

# fab -H 1.2.3.5
[localhost] local: grep 1.2.3.5 /etc/bitrate/puppetmaster/firewall

Fatal error: local() encountered an error (return code 1) while executing 'grep 1.2.3.5      /etc/bitrate/puppetmaster/firewall'

Aborting.

Answer 1

这样做的一种方法是'with quiet（）：'

with quiet():
    result = local("something")
        if result.failed:
            ....
        else:
            ....