[Twisted-Python] Python3 twistd daemon for Ubuntu 14.04 alternatives

[Glyph Lefkowitz]

> On Feb 21, 2017, at 9:28 AM, Dave Curtis <dcurtis at savioke.com> wrote:
> 
> Hi, so for my first post to the list I am going to ask a somewhat lame question.  Apologies if this is not the right list -- clues welcome.

This is totally the right list.  All discussion of Twisted is welcome!

> So my problem is that while my protocol stack spins up very nicely and trivially easy using the twistd daemon, the standard python3-twisted package for 14.04 is waaaay behind and doesn't include twistd (!), and I haven't found a good backport.  I'd also like to avoid doing things that make life hard for DevOps, such as pip3 installing and risking a package manager fight.

The general solution to this problem is "don't use the system Python environment to deploy your applications".

This is what virtualenv is for.

> So some options:
> - Is there a reliable backport of the python3-twisted package for 14.04?  Google is failing me on that one.
> [...]
> - Perhaps I should create my own backport for Ubuntu 14.04 of the current python3-twisted .deb.  (This is probably not the right list to ask, but I'm happy to dereference a pointer.)

Both of these options are bad.  Installing or creating a backport will break any system tools that depend on the python3-twisted package.  This is better than `sudo pip3 install`, but only a little.

> - All I need is the most basic twistd functionality.  Perhaps I should spin up my own by snarfing the code out of the twisted source repo.  I can package this with my stuff temporarily and get on with life.  Clues to the relevant parts of the repo welcome, I haven't poked around much in Twisted sources so need a road map.

If you have the ability to ship parts of the Twisted stack, there's a tool that can automate the "snarfing": pip :-).

> This is a short-term problem for me, we are transitioning to 16.04 soon, but the process is driven by other parts of the software stack. So I don't want to over-invest.  I'm looking for a reasonable band-aid.

16.04 will also be out of date.

I'm tempted to launch into a diatribe about namespacing, containers, and application isolation generally, but before I do - why is it that you want to use the system Python environment?  Had you just not considered the option of virtual environments?

-glyph
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