[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2812: replace Twistd plugins with new `twist` tool

[Tahoe-LAFS]

#2812: replace Twistd plugins with new `twist` tool
--------------------+---------------------------
 Reporter:  warner  |          Owner:
     Type:  task    |         Status:  new
 Priority:  normal  |      Milestone:  undecided
Component:  code    |        Version:  1.11.0
 Keywords:          |  Launchpad Bug:
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 Twisted-16.4.0 was just released, and includes a command-line tool named
 `twist` (to replace the previous `twistd`). The internals of this tool
 appear to be better suited for running programmatically. We currently use
 an awkward fake plugin to use the `twistd` functionality inside `tahoe
 start`.

 This ticket is to investigate whether we can simplify that module by using
 `twist` (specifically `twisted.application.twist._twist.Twist`) instead of
 twistd. Note that `twist` may be entirely internal, and thus off-limits
 for non-Twisted code to depend upon, in which case we'll have to close
 this ticket as a WONTFIX.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2812>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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