Re: [Fab-user] persistent session?

[Christian Vest Hansen]

"the simple answer is no, and this is by design."

I feel compelled to share a bit of the history here. The very first thing I tried to do, was to implement fabric with persistent connections. The SSH protocol has several sub-protocols, and a shell connection is one of them; the ability to run a single command is another. It turns out that if you open a shell connection — which would afford you interactivity and the ability to run several commands in a row in a changeable shell environment — then the protocol does not help you tell when a command has finished executing, or what the return code might be. This is because these things are tied to the shell process, and not the commands that the shell is executing. Without this information, fabric would just hang forever.

I don't know if anyone have tried to build a way to simulate this command-like behaviour over persistent connections to the arbitrary shell programs on the target hosts, but I know that I didn't feel like trying it out way back then. So in a way it is more "suffering reality" than "by design" — at least it was when I was involved.

I have heard fexpect mentioned a couple of times on this list, but I have no idea what it is.

On Wed, Jun 27, 2012 at 4:57 PM, Jasper van den Bosch <address@hidden> wrote:

There are a lot more knowledgeable people on this list than me, but the simple answer is no, and this is by design.

But perhaps you could tell us more about what you want to do. If you just want to execute multiple tasks, you could write a script and send that to the server?

As for fexpect, it will not stray so far from fabric as to implement persistent connections, it is really meant only to complement the interactivity.

Jasper

On 27 June 2012 16:28, Akoria Theano <address@hidden> wrote:

Is there a way to use Fabric for a persistent session beyond just one run/sudo command?

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Jasper van den Bosch

ilogue.com/jasper

I'd love to see your attachment, but please use OpenDocument, not a proprietary format like docx. It's an international standard, endorsed by the EU, and implemented in many office suites, such as LibreOffice, and commercial products from Oracle, Sun, IBM and Microsoft (from 2007).

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— Chris Vest.