[tahoe-lafs-trac-stream] [tahoe-lafs] #1529: corrupted filesize in CHK filecap causes unexpected "bad hash error"

[tahoe-lafs]

#1529: corrupted filesize in CHK filecap causes unexpected "bad hash error"
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     Reporter:  warner         |      Owner:
         Type:  defect         |     Status:  new
     Priority:  major          |  Milestone:  soon
    Component:  code-encoding  |    Version:  1.9.0a1
   Resolution:                 |   Keywords:  error
Launchpad Bug:                 |
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Changes (by davidsarah):

 * keywords:   => error


Comment:

 Replying to [comment:3 warner]:
 > The "new" immutable downloader currently ignores all the share fields it
 doesn't need, including the UEB's filesize field. In this case, I think
 it's better that the downloader explicitly (one might say gratuitously)
 compares the UEB's filesize against the filecap's filesize and throw
 {{{FilecapFilesizeMismatchError}}}, rather than pretending that the UEB's
 filesize is a mistake and attempting to decode the file with the filecap's
 filesize (which will result in the unhelpful ciphertext_hash_tree error in
 this ticket). Think of it as bringing the error forward to a better place.

 +1.

-- 
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1529#comment:4>
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