[tor-bugs] #20174 [Core Tor/Fallback Scripts]: Automate checking existing fallbacks

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#20174: Automate checking existing fallbacks
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  haxxpop
     Type:  enhancement                          |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Fallback Scripts            |        Version:  Tor:
                                                 |  0.2.8.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  fallback, tor-03-unspecified-201612  |  Actual Points:
Parent ID:                                       |         Points:  1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  needs_review => needs_revision
 * component:  Core Tor/Tor => Core Tor/Fallback Scripts


Comment:

 Thanks for making the changes I asked for.
 I checked #20178, and the script logs at the right levels now.

 The check_existing mode would be more useful if it only logged warning and
 info messages for relay fingerprints in the existing list. I have opened
 #21282 for this enhancement.

 There's one change which needs to be made to the usage message, and then
 we can merge this patch: the script output should be saved to the
 `src/or/fallback_dirs.inc` file. That way, the good fallbacks in the
 existing list are kept in the file, and the bad fallbacks are replaced.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20174#comment:9>
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