[Buildbot] #3506: DirectoryUpload hangs if lacks permissions

[Buildbot trac]

#3506: DirectoryUpload hangs if lacks permissions
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Reporter:  gracinet   |      Owner:
    Type:  undecided  |     Status:  new
Priority:  minor      |  Milestone:  undecided
 Version:  0.9.0b7    |   Keywords:
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 I accidentally had a ``DirectoryUpload`` pointint to a directoy where the
 buildmaster has no write permissions.

 Instead of returning an error, it hung indefinitely until the timeout
 reaped it. After target correction, it worked fine.

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Ticket URL: <http://trac.buildbot.net/ticket/3506>
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