[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2909: magic-folder .backup files are wrong

[Tahoe-LAFS]

#2909: magic-folder .backup files are wrong
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 Reporter:  meejah                      |          Owner:  daira
     Type:  defect                      |         Status:  new
 Priority:  normal                      |      Milestone:  undecided
Component:  code-frontend-magic-folder  |        Version:  1.12.1
 Keywords:                              |  Launchpad Bug:
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 The behavior of producing .backup files is wrong (and I believe the spec
 is correct). Currently, whenever we decide to download a file, a `.backup`
 is produced if there was already a file there.

 But, consider the case where Alice and Bob share a folder, and Alice makes
 a series of updates to a file `foo`: on the first update, Bob downloads it
 and writes it; on the second, Bob downloads but already has one so makes a
 `foo.backup` as well; on the third, Bob downloads but already has one
 *and* a `foo.backup` so produces `foo.conflict`.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2909>
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