[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3870: The NixOS CI use of "Cachix" does not correctly detect "forked" PRs, has authentication errors

[Tahoe-LAFS]

#3870: The NixOS CI use of "Cachix" does not correctly detect "forked" PRs, has
authentication errors
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
---------------------+---------------------------
 The "Push to Cachix" step for NixOS 21.05 and 21.11 fail, including this
 text:

 {{{
 Neither auth token nor signing key are present.

 They are looked up via $CACHIX_AUTH_TOKEN and $CACHIX_SIGNING_KEY,
 and if missing also looked up from ~/.config/cachix/cachix.dhall

 Read https://mycache.cachix.org for instructions how to push to your
 binary cache.

 Exited with code exit status 1

 }}}

 The intent of the configuration is to *skip* pushing in this case since it
 will always fail since the cache write key is not available.  It seems as
 though the configuration fails to accomplish this.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3870>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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