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Created by teor@teor

Add a torrc option and descriptor line to opt-in as a FallbackDir

This needs:

  • a proposal and a design
  • a patch to dir-spec.txt
  • a patch to the tor man page
  • a tor code patch
  • an updateFallbackDirs.py code patch
  • a wiki update to [[doc/UpdatingFallbackDirectoryMirrors]]

Here's a quick sketch of a design:

  1. Relay operators set OfferFallbackDir 1 to offer their relay as a potential FallbackDir.
  2. Relays with this option set put offer-fallback-dir in their descriptors
  3. updateFallbackDirs.py loads relay fingerprints with offer-fallback-dir, and from the legacy offer list
  4. updateFallbackDirs.py does stability checks, and generates the fallback list
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