[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2856: remove/conditionalize "shutilwhich" dependency

[Tahoe-LAFS]

#2856: remove/conditionalize "shutilwhich" dependency
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 Reporter:  warner     |          Owner:  daira
     Type:  task       |         Status:  new
 Priority:  normal     |      Milestone:  undecided
Component:  packaging  |        Version:  1.12.0
 Keywords:             |  Launchpad Bug:
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 Somewhere in the 1.12 development cycle, `_auto_deps.py` acquired an
 unconditional dependency upon a package named `shutilwhich`. This impacts
 downstream packagers (i.e. it isn't in Debian yet). Looking at the code,
 it seems that `shutilwhich` is only used by the integration tests, and
 thus should probably be moved into the `[test]` clause of setup.py's
 `extras_require=`. That would let non-testing downstream packages omit the
 dependency.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2856>
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