b4cf22a388
I tend to prefer moving toward explicit exception handling, not away from it, but in this case, I think there are good reasons to let checkPresent throw exceptions: 1. They can all be caught in one place (Remote.hasKey), and we know every possible exception is caught there now, which we didn't before. 2. It simplified the code of the Remotes. I think it makes sense for Remotes to be able to be implemented without needing to worry about catching exceptions inside them. (Mostly.) 3. Types.StoreRetrieve.Preparer can only work on things that return a Bool, which all the other relevant remote methods already did. I do not see a good way to generalize that type; my previous attempts failed miserably.
407 lines
14 KiB
Haskell
407 lines
14 KiB
Haskell
{- git remotes encrypted using git-remote-gcrypt
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-
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- Copyright 2013 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Remote.GCrypt (
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remote,
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chainGen,
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getGCryptUUID,
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coreGCryptId,
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setupRepo
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) where
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import qualified Data.Map as M
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import qualified Data.ByteString.Lazy as L
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import Control.Exception.Extensible
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import Common.Annex
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import Types.Remote
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import Types.GitConfig
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import Types.Crypto
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import Types.Creds
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import qualified Git
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import qualified Git.Command
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import qualified Git.Config
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import qualified Git.GCrypt
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import qualified Git.Construct
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import qualified Git.Types as Git ()
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import qualified Annex.Branch
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import Config
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import Config.Cost
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import Remote.Helper.Git
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import Remote.Helper.Encryptable
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import Remote.Helper.Special
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import Remote.Helper.Messages
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import qualified Remote.Helper.Ssh as Ssh
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import Utility.Metered
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import Annex.UUID
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import Annex.Ssh
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import qualified Remote.Rsync
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import qualified Remote.Directory
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import Utility.Rsync
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import Utility.Tmp
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import Logs.Remote
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import Logs.Transfer
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import Utility.Gpg
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remote :: RemoteType
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remote = RemoteType {
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typename = "gcrypt",
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-- Remote.Git takes care of enumerating gcrypt remotes too,
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-- and will call our gen on them.
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enumerate = return [],
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generate = gen,
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setup = gCryptSetup
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}
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chainGen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
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chainGen gcryptr u c gc = do
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g <- gitRepo
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-- get underlying git repo with real path, not gcrypt path
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r <- liftIO $ Git.GCrypt.encryptedRemote g gcryptr
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let r' = r { Git.remoteName = Git.remoteName gcryptr }
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gen r' u c gc
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gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
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gen baser u c gc = do
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-- doublecheck that cache matches underlying repo's gcrypt-id
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-- (which might not be set), only for local repos
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(mgcryptid, r) <- getGCryptId True baser
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g <- gitRepo
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case (mgcryptid, Git.GCrypt.remoteRepoId g (Git.remoteName baser)) of
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(Just gcryptid, Just cachedgcryptid)
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| gcryptid /= cachedgcryptid -> resetup gcryptid r
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_ -> gen' r u c gc
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where
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-- A different drive may have been mounted, making a different
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-- gcrypt remote available. So need to set the cached
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-- gcrypt-id and annex-uuid of the remote to match the remote
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-- that is now available. Also need to set the gcrypt particiants
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-- correctly.
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resetup gcryptid r = do
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let u' = genUUIDInNameSpace gCryptNameSpace gcryptid
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v <- M.lookup u' <$> readRemoteLog
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case (Git.remoteName baser, v) of
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(Just remotename, Just c') -> do
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setGcryptEncryption c' remotename
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setConfig (remoteConfig baser "uuid") (fromUUID u')
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setConfig (ConfigKey $ Git.GCrypt.remoteConfigKey "gcrypt-id" remotename) gcryptid
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gen' r u' c' gc
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_ -> do
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warning $ "not using unknown gcrypt repository pointed to by remote " ++ Git.repoDescribe r
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return Nothing
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gen' :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
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gen' r u c gc = do
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cst <- remoteCost gc $
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if repoCheap r then nearlyCheapRemoteCost else expensiveRemoteCost
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(rsynctransport, rsyncurl) <- rsyncTransportToObjects r
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let rsyncopts = Remote.Rsync.genRsyncOpts c gc rsynctransport rsyncurl
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let this = Remote
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{ uuid = u
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, cost = cst
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, name = Git.repoDescribe r
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, storeKey = storeKeyDummy
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, retrieveKeyFile = retreiveKeyFileDummy
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, retrieveKeyFileCheap = \_ _ -> return False
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, removeKey = remove this rsyncopts
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, checkPresent = checkKey this rsyncopts
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, checkPresentCheap = repoCheap r
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, whereisKey = Nothing
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, remoteFsck = Nothing
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, repairRepo = Nothing
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, config = c
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, localpath = localpathCalc r
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, repo = r
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, gitconfig = gc { remoteGitConfig = Just $ extractGitConfig r }
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, readonly = Git.repoIsHttp r
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, availability = availabilityCalc r
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, remotetype = remote
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}
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return $ Just $ specialRemote' specialcfg c
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(simplyPrepare $ store this rsyncopts)
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(simplyPrepare $ retrieve this rsyncopts)
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this
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where
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specialcfg
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| Git.repoIsUrl r = (specialRemoteCfg c)
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-- Rsync displays its own progress.
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{ displayProgress = False }
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| otherwise = specialRemoteCfg c
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rsyncTransportToObjects :: Git.Repo -> Annex ([CommandParam], String)
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rsyncTransportToObjects r = do
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(rsynctransport, rsyncurl, _) <- rsyncTransport r
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return (rsynctransport, rsyncurl ++ "/annex/objects")
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rsyncTransport :: Git.Repo -> Annex ([CommandParam], String, AccessMethod)
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rsyncTransport r
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| "ssh://" `isPrefixOf` loc = sshtransport $ break (== '/') $ drop (length "ssh://") loc
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| "//:" `isInfixOf` loc = othertransport
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| ":" `isInfixOf` loc = sshtransport $ separate (== ':') loc
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| otherwise = othertransport
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where
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loc = Git.repoLocation r
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sshtransport (host, path) = do
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let rsyncpath = if "/~/" `isPrefixOf` path
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then drop 3 path
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else path
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opts <- sshCachingOptions (host, Nothing) []
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return (rsyncShell $ Param "ssh" : opts, host ++ ":" ++ rsyncpath, AccessShell)
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othertransport = return ([], loc, AccessDirect)
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noCrypto :: Annex a
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noCrypto = error "cannot use gcrypt remote without encryption enabled"
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unsupportedUrl :: a
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unsupportedUrl = error "using non-ssh remote repo url with gcrypt is not supported"
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gCryptSetup :: Maybe UUID -> Maybe CredPair -> RemoteConfig -> Annex (RemoteConfig, UUID)
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gCryptSetup mu _ c = go $ M.lookup "gitrepo" c
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where
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remotename = fromJust (M.lookup "name" c)
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go Nothing = error "Specify gitrepo="
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go (Just gitrepo) = do
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c' <- encryptionSetup c
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inRepo $ Git.Command.run
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[ Params "remote add"
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, Param remotename
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, Param $ Git.GCrypt.urlPrefix ++ gitrepo
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]
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setGcryptEncryption c' remotename
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{- Run a git fetch and a push to the git repo in order to get
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- its gcrypt-id set up, so that later git annex commands
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- will use the remote as a gcrypt remote. The fetch is
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- needed if the repo already exists; the push is needed
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- if the repo has not yet been initialized by gcrypt. -}
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void $ inRepo $ Git.Command.runBool
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[ Param "fetch"
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, Param remotename
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]
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void $ inRepo $ Git.Command.runBool
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[ Param "push"
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, Param remotename
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, Param $ Git.fromRef Annex.Branch.fullname
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]
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g <- inRepo Git.Config.reRead
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case Git.GCrypt.remoteRepoId g (Just remotename) of
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Nothing -> error "unable to determine gcrypt-id of remote"
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Just gcryptid -> do
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let u = genUUIDInNameSpace gCryptNameSpace gcryptid
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if Just u == mu || isNothing mu
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then do
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method <- setupRepo gcryptid =<< inRepo (Git.Construct.fromRemoteLocation gitrepo)
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gitConfigSpecialRemote u c' "gcrypt" (fromAccessMethod method)
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return (c', u)
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else error $ "uuid mismatch " ++ show (u, mu, gcryptid)
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{- Sets up the gcrypt repository. The repository is either a local
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- repo, or it is accessed via rsync directly, or it is accessed over ssh
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- and git-annex-shell is available to manage it.
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-
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- The GCryptID is recorded in the repository's git config for later use.
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- Also, if the git config has receive.denyNonFastForwards set, disable
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- it; gcrypt relies on being able to fast-forward branches.
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-}
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setupRepo :: Git.GCrypt.GCryptId -> Git.Repo -> Annex AccessMethod
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setupRepo gcryptid r
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| Git.repoIsUrl r = do
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(_, _, accessmethod) <- rsyncTransport r
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case accessmethod of
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AccessDirect -> rsyncsetup
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AccessShell -> ifM gitannexshellsetup
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( return AccessShell
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, rsyncsetup
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)
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| Git.repoIsLocalUnknown r = localsetup =<< liftIO (Git.Config.read r)
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| otherwise = localsetup r
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where
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localsetup r' = do
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let setconfig k v = liftIO $ Git.Command.run [Param "config", Param k, Param v] r'
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setconfig coreGCryptId gcryptid
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setconfig denyNonFastForwards (Git.Config.boolConfig False)
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return AccessDirect
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{- As well as modifying the remote's git config,
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- create the objectDir on the remote,
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- which is needed for direct rsync of objects to work.
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-}
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rsyncsetup = Remote.Rsync.withRsyncScratchDir $ \tmp -> do
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liftIO $ createDirectoryIfMissing True $ tmp </> objectDir
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(rsynctransport, rsyncurl, _) <- rsyncTransport r
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let tmpconfig = tmp </> "config"
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void $ liftIO $ rsync $ rsynctransport ++
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[ Param $ rsyncurl ++ "/config"
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, Param tmpconfig
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]
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liftIO $ do
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void $ Git.Config.changeFile tmpconfig coreGCryptId gcryptid
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void $ Git.Config.changeFile tmpconfig denyNonFastForwards (Git.Config.boolConfig False)
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ok <- liftIO $ rsync $ rsynctransport ++
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[ Params "--recursive"
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, Param $ tmp ++ "/"
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, Param rsyncurl
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]
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unless ok $
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error "Failed to connect to remote to set it up."
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return AccessDirect
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{- Ask git-annex-shell to configure the repository as a gcrypt
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- repository. May fail if it is too old. -}
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gitannexshellsetup = Ssh.onRemote r (boolSystem, False)
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"gcryptsetup" [ Param gcryptid ] []
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denyNonFastForwards = "receive.denyNonFastForwards"
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isShell :: Remote -> Bool
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isShell r = case method of
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AccessShell -> True
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_ -> False
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where
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method = toAccessMethod $ fromMaybe "" $
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remoteAnnexGCrypt $ gitconfig r
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shellOrRsync :: Remote -> Annex a -> Annex a -> Annex a
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shellOrRsync r ashell arsync
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| isShell r = ashell
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| otherwise = arsync
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{- Configure gcrypt to use the same list of keyids that
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- were passed to initremote as its participants.
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- Also, configure it to use a signing key that is in the list of
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- participants, which gcrypt requires is the case, and may not be
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- depending on system configuration.
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-
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- (For shared encryption, gcrypt's default behavior is used.)
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-
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- Also, sets gcrypt-publish-participants to avoid unncessary gpg
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- passphrase prompts.
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-}
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setGcryptEncryption :: RemoteConfig -> String -> Annex ()
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setGcryptEncryption c remotename = do
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let participants = remoteconfig Git.GCrypt.remoteParticipantConfigKey
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case extractCipher c of
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Nothing -> noCrypto
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Just (EncryptedCipher _ _ (KeyIds { keyIds = ks})) -> do
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setConfig participants (unwords ks)
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let signingkey = ConfigKey $ Git.GCrypt.remoteSigningKey remotename
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skeys <- M.keys <$> liftIO secretKeys
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case filter (`elem` ks) skeys of
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[] -> noop
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(k:_) -> setConfig signingkey k
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Just (SharedCipher _) ->
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unsetConfig participants
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setConfig (remoteconfig Git.GCrypt.remotePublishParticipantConfigKey)
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(Git.Config.boolConfig True)
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where
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remoteconfig n = ConfigKey $ n remotename
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store :: Remote -> Remote.Rsync.RsyncOpts -> Storer
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store r rsyncopts
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| not $ Git.repoIsUrl (repo r) =
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byteStorer $ \k b p -> guardUsable (repo r) False $ liftIO $ do
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let tmpdir = Git.repoLocation (repo r) </> "tmp" </> keyFile k
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void $ tryIO $ createDirectoryIfMissing True tmpdir
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let tmpf = tmpdir </> keyFile k
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meteredWriteFile p tmpf b
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let destdir = parentDir $ gCryptLocation r k
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Remote.Directory.finalizeStoreGeneric tmpdir destdir
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return True
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| Git.repoIsSsh (repo r) = if isShell r
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then fileStorer $ \k f p -> Ssh.rsyncHelper (Just p)
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=<< Ssh.rsyncParamsRemote False r Upload k f Nothing
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else fileStorer $ Remote.Rsync.store rsyncopts
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| otherwise = unsupportedUrl
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retrieve :: Remote -> Remote.Rsync.RsyncOpts -> Retriever
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retrieve r rsyncopts
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| not $ Git.repoIsUrl (repo r) = byteRetriever $ \k sink ->
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guardUsable (repo r) False $
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sink =<< liftIO (L.readFile $ gCryptLocation r k)
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| Git.repoIsSsh (repo r) = if isShell r
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then fileRetriever $ \f k p ->
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unlessM (Ssh.rsyncHelper (Just p) =<< Ssh.rsyncParamsRemote False r Download k f Nothing) $
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error "rsync failed"
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else fileRetriever $ Remote.Rsync.retrieve rsyncopts
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| otherwise = unsupportedUrl
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where
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remove :: Remote -> Remote.Rsync.RsyncOpts -> Key -> Annex Bool
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remove r rsyncopts k
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| not $ Git.repoIsUrl (repo r) = guardUsable (repo r) False $
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liftIO $ Remote.Directory.removeDirGeneric (Git.repoLocation (repo r)) (parentDir (gCryptLocation r k))
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| Git.repoIsSsh (repo r) = shellOrRsync r removeshell removersync
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| otherwise = unsupportedUrl
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where
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removersync = Remote.Rsync.remove rsyncopts k
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removeshell = Ssh.dropKey (repo r) k
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checkKey :: Remote -> Remote.Rsync.RsyncOpts -> Key -> Annex Bool
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checkKey r rsyncopts k
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| not $ Git.repoIsUrl (repo r) =
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guardUsable (repo r) (cantCheck $ repo r) $
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liftIO $ doesFileExist (gCryptLocation r k)
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| Git.repoIsSsh (repo r) = shellOrRsync r checkshell checkrsync
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| otherwise = unsupportedUrl
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where
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checkrsync = Remote.Rsync.checkKey (repo r) rsyncopts k
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checkshell = Ssh.inAnnex (repo r) k
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{- Annexed objects are hashed using lower-case directories for max
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- portability. -}
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gCryptLocation :: Remote -> Key -> FilePath
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gCryptLocation r key = Git.repoLocation (repo r) </> objectDir </> keyPath key hashDirLower
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data AccessMethod = AccessDirect | AccessShell
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fromAccessMethod :: AccessMethod -> String
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fromAccessMethod AccessShell = "shell"
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fromAccessMethod AccessDirect = "true"
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toAccessMethod :: String -> AccessMethod
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toAccessMethod "shell" = AccessShell
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toAccessMethod _ = AccessDirect
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getGCryptUUID :: Bool -> Git.Repo -> Annex (Maybe UUID)
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getGCryptUUID fast r = (genUUIDInNameSpace gCryptNameSpace <$>) . fst
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<$> getGCryptId fast r
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coreGCryptId :: String
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coreGCryptId = "core.gcrypt-id"
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{- gcrypt repos set up by git-annex as special remotes have a
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- core.gcrypt-id setting in their config, which can be mapped back to
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- the remote's UUID.
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-
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- In fast mode, only checks local repos. To check a remote repo,
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- tries git-annex-shell and direct rsync of the git config file.
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-
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- (Also returns a version of input repo with its config read.) -}
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getGCryptId :: Bool -> Git.Repo -> Annex (Maybe Git.GCrypt.GCryptId, Git.Repo)
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getGCryptId fast r
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| Git.repoIsLocal r || Git.repoIsLocalUnknown r = extract <$>
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liftIO (catchMaybeIO $ Git.Config.read r)
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| not fast = extract . liftM fst <$> getM (eitherToMaybe <$>)
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[ Ssh.onRemote r (Git.Config.fromPipe r, Left undefined) "configlist" [] []
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, getConfigViaRsync r
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]
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| otherwise = return (Nothing, r)
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where
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extract Nothing = (Nothing, r)
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extract (Just r') = (Git.Config.getMaybe coreGCryptId r', r')
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getConfigViaRsync :: Git.Repo -> Annex (Either SomeException (Git.Repo, String))
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getConfigViaRsync r = do
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(rsynctransport, rsyncurl, _) <- rsyncTransport r
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liftIO $ do
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withTmpFile "tmpconfig" $ \tmpconfig _ -> do
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void $ rsync $ rsynctransport ++
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[ Param $ rsyncurl ++ "/config"
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, Param tmpconfig
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]
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Git.Config.fromFile r tmpconfig
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