[tor-bugs] #10933 [Chutney]: support for setting binary paths via environment varaibles

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#10933: support for setting binary paths via environment varaibles
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     Reporter:  dave2008     |      Owner:  nickm
         Type:  enhancement  |     Status:  needs_revision
     Priority:  normal       |  Milestone:
    Component:  Chutney      |    Version:
   Resolution:               |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by nickm):

 Better than nothing!  Let's try to distinguish that particular error (
 os.OSError, errno=ENOENT) from the others.  And when we catch it, let's
 make sure to tell the user what path we were looking for, and how to set
 the location of tor or tor-gencert.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10933#comment:3>
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