我无法在Fabric中使用virtualenvwrapper切换virtualenv

Question

我使用的virtualenvwrapper用virtualenv我的Django的deployement.以下是我的Fabric任务:

proj_path = '/path/to/proj'

def setup_code():
    sudo('pip install virtualenvwrapper')
    run('export WORKON_HOME=$HOME/.virtualenvs')
    run('source /usr/local/bin/virtualenvwrapper.sh && mkvirtualenv myenv')
    run('source /usr/local/bin/virtualenvwrapper.sh && workon myenv')
    cd(proj_path)
    req_file = os.path.join(proj_path, 'requirements.txt')
    run('pip install -r %s' % req_file)

我执行了上述fab任务,但表现得很奇怪.pip开始检索所有包,然后开始为它们执行安装文件.执行setup文件时崩溃说Permission denied.

但为什么？它的工作中~和virtualenv.

我究竟做错了什么？

Answer 1

弄清楚问题:

对于面料:

cd('dir') # doesn't works.

以下作品:

with cd('dir'):
    print('pwd') # Directory change reflects here.

同样,其他环境因素如:

run('export WORKON_HOME=$HOME/.virtualenvs')
run('source /usr/local/bin/virtualenvwrapper.sh && mkvirtualenv myenv')
run('source /usr/local/bin/virtualenvwrapper.sh && workon myenv')

但改为:

with prefix('WORKON_HOME=$HOME/.virtualenvs'):
    with prefix('source /usr/local/bin/virtualenvwrapper.sh'):
        with prefix('workon myenv'): # Assuming there is a env called `myenv`
            run('pip install -r requirements.txt') # Works in virtualenv

从官方文档中找出来:http://docs.fabfile.org/en/stable/api/core/context_managers.html