[tahoe-lafs-trac-stream] [tahoe-lafs] #1937: back up the content of a file even if the content changes without changing mtime

[tahoe-lafs]

#1937: back up the content of a file even if the content changes without changing
mtime
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     Reporter:  zooko    |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:  undecided
    Component:  code     |    Version:  1.9.2
   Resolution:           |   Keywords:  tahoe-backup reliability
Launchpad Bug:           |  preservation
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Comment (by daira):

 If we use the approach of comment:1, then I suggest using a fixed G = 4s
 instead of trying to guess what the timestamp granularity is. Also, after
 the file has been uploaded we should check the mtime again, in case it was
 modified while we were reading it.

 Short of making a shadow copy on filesystems that support it, it's not
 possible to get a completely consistent snapshot of a filesystem using
 POSIX APIs.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1937#comment:2>
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