[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2427: handle case when directory is removed from drop upload directory

[Tahoe-LAFS]

#2427: handle case when directory is removed from drop upload directory
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     Reporter:  dawuud   |      Owner:  daira
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:  undecided
    Component:  unknown  |    Version:  1.10.0
   Resolution:           |   Keywords:
Launchpad Bug:           |
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Comment (by daira):

 The constant for IN_EXCL_UNLINK isn't defined by Twisted
 ([https://twistedmatrix.com/trac/ticket/7789]) but that's okay, we can
 define it ourselves, since Twisted passes through unknown flags.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2427#comment:2>
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