[tor-bugs] #13862 [Tor]: No error message when fatally failing to open files in DataDirectory

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#13862: No error message when fatally failing to open files in DataDirectory
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 Reporter:  sqrt2                                |          Owner:
     Type:  enhancement                          |         Status:  new
 Priority:  normal                               |      Milestone:
Component:  Tor                                  |        Version:
 Keywords:  datadirectory permissions error-     |  Actual Points:
  reporting                                      |         Points:
Parent ID:                                       |
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 Due to installing packages from conflicting sources, I ended up with a Tor
 installation where the tor daemon (with `User toranon`) could access the
 DataDirectory, but not open the files in it for lack of permissions.

 In this situation, tor exits quickly with only the following messages:

 {{{
 Nov 30 00:07:12.878 [notice] Tor v0.2.5.10 (git-42b42605f8d8eac2) running
 on Linux with Libevent 2.0.18-stable, OpenSSL 1.0.1e-fips and Zlib 1.2.7.
 Nov 30 00:07:12.878 [notice] Tor can't help you if you use it wrong! Learn
 how to be safe at https://www.torproject.org/download/download#warning
 Nov 30 00:07:12.878 [notice] Read configuration file "/usr/share/tor
 /defaults-torrc".
 Nov 30 00:07:12.878 [notice] Read configuration file "/etc/tor/torrc".
 Nov 30 00:07:12.881 [notice] Opening Socks listener on 127.0.0.1:9050
 Nov 30 00:07:12.881 [notice] Opening Control listener on 127.0.0.1:9151
 Nov 30 00:07:12.881 [notice] Caching new entry toranon for toranon
 Nov 30 00:07:12.881 [notice] Caching new entry toranon for toranon
 }}}

 There are no explicit `Log` directives in torrc.

 Except for exit status 1, there is no indication to the user that
 something has gone wrong, and what the problem could be. We should print a
 helpful error message.

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Ticket URL: <https://trac.torproject.org:443/projects/tor/ticket/13862>
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