[tahoe-lafs-trac-stream] [Tahoe-LAFS] #1432: Magic Folder on Mac OS X and other BSDs (was: drop-upload on Mac OS X and other BSDs)

[Tahoe-LAFS]

#1432: Magic Folder on Mac OS X and other BSDs
-------------------------------------+-------------------------------------
     Reporter:  davidsarah           |      Owner:
         Type:  enhancement          |     Status:  new
     Priority:  normal               |  Milestone:  undecided
    Component:  code-frontend-       |    Version:  1.8.2
  magic-folder                       |   Keywords:  fsevents mac bsd magic-
   Resolution:                       |  folder
Launchpad Bug:                       |
-------------------------------------+-------------------------------------
Changes (by daira):

 * keywords:  drop-upload, fsevents, mac, bsd, magic-folder => fsevents mac
     bsd magic-folder


Old description:

> The drop-upload feature (#1429) uses inotify to detect filesystem
> changes, and therefore works only on Linux. This ticket is about
> supporting the same feature on Mac OS X and possibly other BSD-based
> operating systems. Mac OS X has the
> [http://en.wikipedia.org/wiki/FSEvents fsevents], and all BSDs including
> Mac OS X have kqueue/kevent. If I understand correctly, neither fsevents
> nor kqueue/kevent give notifications of which files have changed, so the
> implementation will have to scan the directory and look at last-modified
> times to determine that. (This is occasionally also necessary for
> correctness on Linux; see #1430.)

New description:

 The Magic Folder feature currently only works on Linux (where it uses
 inotify to detect filesystem changes), and Windows (where it uses
 `ReadDirectoryChangesW`). This ticket is about supporting the same feature
 on Mac OS X and possibly other BSD-based operating systems.

 Mac OS X has the [http://en.wikipedia.org/wiki/FSEvents fsevents], and all
 BSDs including Mac OS X have kqueue/kevent. If I understand correctly,
 neither fsevents nor kqueue/kevent give notifications of which files have
 changed, so the implementation will have to scan the directory and look at
 last-modified times to determine that. (This is occasionally also
 necessary for correctness on Linux and Windows; see #1430.)

--

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1432#comment:12>
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