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CHAPTER 15 IMAP
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display or summary for the user to click into, pulling message parts and attachments down from the server on demand. The client can also set flags on each message some of which are also meaningful to the server and can delete messages by setting the \Delete flag and then performing an expunge operation. Finally, IMAP offers sophisticated search functionality, again so that common user operations can be supported without requiring the e-mail data to be downloaded to the local machine.
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C H A P T E R 16
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Telnet and SSH
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If you have never read it, then you should brew some of your favorite coffee, sit down, and treat yourself to reading Neal Stephenson's essay In the Beginning Was the Command Line. You can download a copy from his web site, in the form appropriately enough of a raw text file: http://www.cryptonomicon.com/beginning.html. The command line is the topic of this chapter: how you can access it over the network, together with enough discussion about its typical behavior to get you through any frustrations you might encounter while trying to use it. Happily enough, this old-fashioned idea of sending simple textual commands to another computer will, for many readers, be one of the most relevant topics of this book. The main network protocol that we will discuss SSH, the Secure Shell seems to be used everywhere to configure and maintain machines of all kinds. When you get a new account at a web hosting company like WebFaction and have used their fancy control panel to set up your domain names and list of web applications, the command line is then your primary means of actually installing and running the code behind your web sites. Virtual or physical servers from companies like Linode, Slicehost, and Rackspace are almost always administered through SSH connections. If you build a cloud of dynamically allocated servers using an API-based virtual hosting service like Amazon AWS, you will find that Amazon gives you access to your new host by asking you for an SSH key and installing it so that you can log in to your new instance immediately and without a password.
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It is as if, once early computers became able to receive text commands and return text output in response, they reached a kind of pinnacle of usefulness that has never yet been improved upon. Language is the most powerful means humans have for expressing and building meaning, and no amount of pointing, clicking, or dragging with a mouse has ever expressed even a fraction of the nuance that can be communicated when we type even in the cramped and exacting language of the Unix shell.
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Before getting into the details of how the command line works, and how you can access it over the network, we should pause and note that there exist many systems today for automating the entire process. If you have started reading this chapter on programming the networked command line because you have dozens or hundreds of machines to maintain and you need to start sending them all the same commands, then you might find that tools already exist that prevent you from having to read any further tools that already provide ways to write command scripts, push them out for execution across a
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CHAPTER 16 TELNET AND SSH
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cloud of machines, batch up any error messages or responses for your review, and even save commands in a queue to be re-tried later in case a machine is down and cannot be reached at the moment. What are your options First, the Fabric library is very popular with Python programmers who need to run commands and copy files to remote server machines. As you can see in Listing 16 1, a Fabric script calls very simple functions with names like put(), cd(), and run() to perform operations on the machines to which it connects. We will not cover Fabric in this book, since it does not implement a network protocol of its own, and also because it would be more appropriate in a book on using Python for system administration. But you can learn more about it at its web site: http://fabfile.org/. Although Listing 16 1 is designed to be run by Fabric's own fab command-line tool, Fabric can also be used from inside your own Python programs; again, consult their documentation for details. Listing 16 1. What Fabric Scripts Look Like #!/usr/bin/env python # Foundations of Python Network Programming - 16 - fabfile.py # A sample Fabric script # # # # # # # # Even though this chapter will not cover Fabric, you might want to try using Fabric to automate your SSH commands instead of re-inventing the wheel. Here is a script that checks for Python on remote machines. Fabric finds this "fabfile.py" automatically if you are in the same directory. Try running both verbosely, and with most messages off: $ fab versions:host=server.example.com $ fab --hide=everything versions:host=server.example.com
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from fabric.api import * def versions(): with cd('/usr/bin'): with settings(hide('warnings'), warn_only=True): for version in '2.4', '2.5', '2.6', '2.7', '3.0', '3.1': result = run('python%s -c "None"' % version) if not result.failed: print "Host", env.host, "has Python", version
Another project to check out is Silver Lining, which is being developed by Ian Bicking. It is still very immature, but if you are an experienced programmer who needs its specific capabilities, then you might find that it solves your problems well. This library goes beyond batching commands across many different servers: it will actually create and initialize Ubuntu servers through the libcloud Python API, and then install your Python web applications there for you. You can learn more about this promising project at http://cloudsilverlining.org/. Finally, there is pexpect. While it is not, technically, a program that itself knows how to use the network, it is often used to control the system ssh or telnet command when a Python programmer wants to automate interactions with a remote prompt of some kind. This typically takes place in a situation where no API for a device is available, and commands simply have to be typed each time the command-line prompt appears. Configuring simple network hardware often requires this kind of clunky step-by-step interaction. You can learn more about pexpect here: http://pypi.python.org/pypi/pexpect. Finally, there are more specific projects that provide mechanisms for remote systems administration. Red Hat and Fedora users might look at func, which uses an SSL-encrypted XML-RPC service that lets you write Python programs that perform system configuration and maintenance: https://fedorahosted.org/func/.
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