Pass parameter to fabric task

In Fabric 2, simply add the argument to your task function. For example, to pass the version argument to task deploy:

@task
def deploy(context, version):
    ...

Run it as follows:

fab -H host deploy --version v1.2.3

Fabric even documents the options automatically:

$ fab --help deploy
Usage: fab [--core-opts] deploy [--options] [other tasks here ...]

Docstring:
  none

Options:
  -v STRING, --version=STRING

Fabric 2 task arguments documentation:

http://docs.pyinvoke.org/en/latest/concepts/invoking-tasks.html#task-command-line-arguments

Fabric 1.X uses the following syntax for passing arguments to tasks:

 fab task:'hello world'
 fab task:something='hello'
 fab task:foo=99,bar=True
 fab task:foo,bar

You can read more about it in Fabric docs.

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