[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2802: startup failures non-obvious

[Tahoe-LAFS]

#2802: startup failures non-obvious
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 Reporter:  meejah                      |          Owner:  daira
     Type:  defect                      |         Status:  new
 Priority:  normal                      |      Milestone:  undecided
Component:  code-frontend-magic-folder  |        Version:  1.11.0
 Keywords:                              |  Launchpad Bug:
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 If you start up a node with a magic-folder and for some reason the shared-
 folder can't be accessed you'll get a long exception in `logs/twistd.log`
 ending with `allmydata.mutable.common.UnrecoverableFileError: no
 recoverable versions`.

 However, the node keeps running but will not do any magic-folder "stuff"
 any more. No matter what, the error printed to the log should be something
 suitable for a user (e.g. "can't access magic-folder directory X" or so).

 We should either:

 - kill the entire node if this happens
 - keep re-trying (and re-logging the error)

 I have seen this occasionally when running `check_magicfolder_smoke.py`
 tests but am unsure how to reliably repeat it. The obvious thing of
 turning off all the storage servers and re-starting the Alice (or Bob)
 client doesn't appear to be sufficient.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2802>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage