[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2905: fail harder if we can't write announcement-seqnum

[Tahoe-LAFS]

#2905: fail harder if we can't write announcement-seqnum
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 Reporter:  meejah        |          Owner:
     Type:  defect        |         Status:  new
 Priority:  normal        |      Milestone:  undecided
Component:  code-storage  |        Version:  1.12.1
 Keywords:                |  Launchpad Bug:
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 If the file `announcement-seqnum` in the node dir isn't writable, the code
 in `write_config` (in `Node`, or in new `_Config` class) will catch and
 log the error.

 However, this isn't very noticeable and we should probably fail harder
 (e.g. like exiting with an error). Other things which write config-files
 into the node dir should also be examined.

 In this particular case, if announcement-seqnum *doesn't* get written (and
 the user doesn't notice the error in the logs) then the next time we try
 and make an announcement (next re-start) the introducer will reject it.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2905>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage