114 lines
3.5 KiB
Haskell
114 lines
3.5 KiB
Haskell
{- git-remote-gcrypt support
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-
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- https://spwhitton.name/tech/code/git-remote-gcrypt/
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-
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- Copyright 2013 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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{-# LANGUAGE OverloadedStrings #-}
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module Git.GCrypt where
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import Common
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import Git.Types
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import Git.Construct
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import qualified Git.Config as Config
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import qualified Git.Command as Command
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import Utility.Gpg
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import qualified Data.ByteString as S
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urlScheme :: String
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urlScheme = "gcrypt:"
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urlPrefix :: String
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urlPrefix = urlScheme ++ ":"
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isEncrypted :: Repo -> Bool
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isEncrypted Repo { location = Url url } = urlPrefix `isPrefixOf` show url
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isEncrypted _ = False
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{- The first Repo is the git repository that has the second Repo
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- as one of its remotes.
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-
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- When the remote Repo uses gcrypt, returns the actual underlying
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- git repository that gcrypt is using to store its data.
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-
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- Throws an exception if an url is invalid or the repo does not use
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- gcrypt.
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-}
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encryptedRemote :: Repo -> Repo -> IO Repo
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encryptedRemote baserepo = go
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where
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go Repo { location = Url url }
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| urlPrefix `isPrefixOf` u =
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fromRemoteLocation (drop plen u) baserepo
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| otherwise = notencrypted
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where
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u = show url
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plen = length urlPrefix
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go _ = notencrypted
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notencrypted = giveup "not a gcrypt encrypted repository"
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data ProbeResult = Decryptable | NotDecryptable | NotEncrypted
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{- Checks if the git repo at a location uses gcrypt.
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-
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- Rather expensive -- many need to fetch the entire repo contents.
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- (Which is fine if the repo is going to be added as a remote..)
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-}
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probeRepo :: String -> Repo -> IO ProbeResult
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probeRepo loc baserepo = do
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let p = proc "git" $ toCommand $ Command.gitCommandLine
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[ Param "remote-gcrypt"
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, Param "--check"
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, Param loc
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] baserepo
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(_, _, _, pid) <- createProcess p
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code <- waitForProcess pid
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return $ case code of
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ExitSuccess -> Decryptable
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ExitFailure 1 -> NotDecryptable
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ExitFailure _ -> NotEncrypted
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type GCryptId = String
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{- gcrypt gives each encrypted repository a uique gcrypt-id,
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- which is stored in the repository (in encrypted form)
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- and cached in a per-remote gcrypt-id configuration setting. -}
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remoteRepoId :: Repo -> Maybe RemoteName -> Maybe GCryptId
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remoteRepoId r n = fromConfigValue <$> getRemoteConfig "gcrypt-id" r n
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getRemoteConfig :: S.ByteString -> Repo -> Maybe RemoteName -> Maybe ConfigValue
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getRemoteConfig field repo remotename = do
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n <- remotename
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Config.getMaybe (remoteConfigKey field n) repo
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{- Gpg keys that the remote is encrypted for.
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- If empty, gcrypt uses --default-recipient-self -}
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getParticiantList :: Maybe Repo -> Repo -> Maybe RemoteName -> KeyIds
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getParticiantList globalconfigrepo repo remotename = KeyIds $ parse $ firstJust
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[ getRemoteConfig "gcrypt-participants" repo remotename
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, Config.getMaybe defaultkey repo
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, Config.getMaybe defaultkey =<< globalconfigrepo
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]
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where
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defaultkey = "gcrypt.participants"
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parse (Just (ConfigValue "simple")) = []
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parse (Just (ConfigValue b)) = words (decodeBS' b)
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parse Nothing = []
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remoteParticipantConfigKey :: RemoteName -> ConfigKey
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remoteParticipantConfigKey = remoteConfigKey "gcrypt-participants"
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remotePublishParticipantConfigKey :: RemoteName -> ConfigKey
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remotePublishParticipantConfigKey = remoteConfigKey "gcrypt-publish-participants"
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remoteSigningKey :: RemoteName -> ConfigKey
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remoteSigningKey = remoteConfigKey "gcrypt-signingkey"
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remoteConfigKey :: S.ByteString -> RemoteName -> ConfigKey
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remoteConfigKey key remotename = ConfigKey $
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"remote." <> encodeBS' remotename <> "." <> key
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