python - Fabric:意外标记附近的语法错误 '('

Question

我有这样的fabfile.py:

from fabric.api import *

def deploy():
    with prefix('source venv/bin/activate'):
        local('pex -r <(cat requirements.txt) . -o app.pex')

当我运行$ fab deploy时我得到:

$ fab deploy
[localhost] local: pex -r <(cat requirements.txt) . -o app.pex
/bin/sh: -c: line 0: syntax error near unexpected token `('
/bin/sh: -c: line 0: `source venv/bin/activate && pex -r <(cat requirements.txt) . -o app.pex'

Fatal error: local() encountered an error (return code 1) while executing 'pex -r <(cat requirements.txt) . -o app.pex'

Aborting.

命令source venv/bin/activate && pex -r <(cat requirements.txt) . -o app.pex在 shell 中运行正常。我是 Fabric 新手。这里出了什么问题？

Answer 1

fabric.operations.local() function默认情况下使用 /bin/sh 作为 shell 来运行命令。这个基本 shell 不支持 /bin/bash 所支持的所有语法。

如果您必须有权访问 Bash shell 语法，请设置 shell='/bin/bash':

local('pex -r <(cat requirements.txt) . -o app.pex', shell='/bin/bash'))