[tor-bugs] #19830 [Metrics/CollecTor]: Check if recent directory exists before checking available space

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#19830: Check if recent directory exists before checking available space
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 Reporter:  karsten            |          Owner:  iwakeh
     Type:  defect             |         Status:  needs_review
 Priority:  Low                |      Milestone:  CollecTor 1.0.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Changes (by iwakeh):

 * status:  accepted => needs_review


Comment:

 Please review
 [https://gitweb.torproject.org/user/iwakeh/collector.git/commit/?h=task-19830
 my branch].

 Solution:
 Now check the root of given path. That should always exist and be
 accessible. Any IOException here is a major problem and escalated via
 RuntimeException.

 Added test for the problem and added some necessary test permissions.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19830#comment:2>
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