[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2535: Magic Folder: permissions of downloaded files should be set in a more failure-safe way

[Tahoe-LAFS]

#2535: Magic Folder: permissions of downloaded files should be set in a more
failure-safe way
-------------------------------------+-------------------------------------
     Reporter:  dawuud               |      Owner:  daira
         Type:  defect               |     Status:  new
     Priority:  normal               |  Milestone:  undecided
    Component:  code-frontend-       |    Version:  1.10.1
  magic-folder                       |   Keywords:  magic-folder
   Resolution:                       |  permissions security usability unix
Launchpad Bug:                       |  docs-needed
-------------------------------------+-------------------------------------

Comment (by dawuud):

 i've fixed the things daira said to fix in her review comments.
 i also noticed this branch doesn't merge cleanly onto stable.12 so i'll
 have to make another branch using stable.12 and then perhaps cherry-pick
 several times.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2535#comment:29>
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