94 lines
2.9 KiB
Haskell
94 lines
2.9 KiB
Haskell
{- git-annex special remote configuration
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-
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- Copyright 2019 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Annex.SpecialRemote.Config where
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import Common
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import Types.Remote (RemoteConfigField, RemoteConfig)
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import Types.UUID
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import qualified Data.Map as M
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import qualified Data.Set as S
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{- The name of a configured remote is stored in its config using this key. -}
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nameField :: RemoteConfigField
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nameField = "name"
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{- The name of a sameas remote is stored using this key instead.
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- This prevents old versions of git-annex getting confused. -}
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sameasNameField :: RemoteConfigField
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sameasNameField = "sameas-name"
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lookupName :: RemoteConfig -> Maybe String
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lookupName c = M.lookup nameField c <|> M.lookup sameasNameField c
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{- The uuid that a sameas remote is the same as is stored in this key. -}
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sameasUUIDField :: RemoteConfigField
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sameasUUIDField = "sameas-uuid"
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{- The type of a remote is stored in its config using this key. -}
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typeField :: RemoteConfigField
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typeField = "type"
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autoEnableField :: RemoteConfigField
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autoEnableField = "autoenable"
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encryptionField :: RemoteConfigField
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encryptionField = "encryption"
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macField :: RemoteConfigField
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macField = "mac"
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cipherField :: RemoteConfigField
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cipherField = "cipher"
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cipherkeysField :: RemoteConfigField
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cipherkeysField = "cipherkeys"
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pubkeysField :: RemoteConfigField
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pubkeysField = "pubkeys"
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chunksizeField :: RemoteConfigField
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chunksizeField = "chunksize"
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{- A remote with sameas-uuid set will inherit these values from the config
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- of that uuid. These values cannot be overridden in the remote's config. -}
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sameasInherits :: S.Set RemoteConfigField
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sameasInherits = S.fromList
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-- encryption configuration is necessarily the same for two
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-- remotes that access the same data store
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[ encryptionField
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, macField
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, cipherField
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, cipherkeysField
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, pubkeysField
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-- legacy chunking was either enabled or not, so has to be the same
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-- across configs for remotes that access the same data
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-- (new-style chunking does not have that limitation)
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, chunksizeField
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]
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{- Each RemoteConfig that has a sameas-uuid inherits some fields
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- from it. Such fields can only be set by inheritance; the RemoteConfig
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- cannot provide values from them. -}
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addSameasInherited :: M.Map UUID RemoteConfig -> RemoteConfig -> RemoteConfig
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addSameasInherited m c = case toUUID <$> M.lookup sameasUUIDField c of
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Nothing -> c
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Just sameasuuid -> case M.lookup sameasuuid m of
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Nothing -> c
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Just parentc ->
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M.withoutKeys c sameasInherits
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`M.union`
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M.restrictKeys parentc sameasInherits
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{- Remove any fields inherited from a sameas-uuid. When storing a
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- RemoteConfig, those fields don't get stored, since they were already
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- inherited. -}
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removeSameasInherited :: RemoteConfig -> RemoteConfig
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removeSameasInherited c = case M.lookup sameasUUIDField c of
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Nothing -> c
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Just _ -> M.withoutKeys c sameasInherits
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