[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3853: If a given header is too short, `ShareFile.is_valid_header` method raises an exception

[Tahoe-LAFS]

#3853: If a given header is too short, `ShareFile.is_valid_header` method raises
an exception
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 Since the point of this method is to determine if some arbitrary bytes
 from a file match the immutable container header and it signals *some*
 mismatches by returning false, it would be nice if it signaled short-
 candidate-string by returning false too.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3853>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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