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change retrieveExport and getKey to throw exception

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retrieveExport is part of ongoing transition to make remote methods
throw exceptions, rather than silently hide them.

getKey very rarely fails, and when it does it's always for the same reason
(user configured annex.backend to url for some reason). So, this will
avoid dealing with Nothing everywhere it's used.

This commit was sponsored by Ilya Shlyakhter on Patreon.
This commit is contained in:
Joey Hess 2020-05-15 12:51:09 -04:00
parent 4814b444dd
commit 3334d3831b
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23 changed files with 151 additions and 152 deletions
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Types/Backend.hs
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@ -17,7 +17,7 @@ import Utility.FileSystemEncoding
data BackendA a = Backend
{ backendVariety :: KeyVariety
, getKey :: KeySource -> MeterUpdate -> a (Maybe Key)
, getKey :: Maybe (KeySource -> MeterUpdate -> a Key)
-- Verifies the content of a key.
, verifyKeyContent :: Maybe (Key -> FilePath -> a Bool)
-- Checks if a key can be upgraded to a better form.