111 lines
2.7 KiB
Haskell
111 lines
2.7 KiB
Haskell
{- Web remotes.
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-
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- Copyright 2011 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.Web (
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remote,
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setUrl
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) where
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import AnnexCommon
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import Types.Remote
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import qualified Git
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import UUID
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import Config
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import PresenceLog
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import LocationLog
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import qualified Utility.Url as Url
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type URLString = String
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remote :: RemoteType Annex
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remote = RemoteType {
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typename = "web",
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enumerate = list,
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generate = gen,
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setup = error "not supported"
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}
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-- There is only one web remote, and it always exists.
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-- (If the web should cease to exist, remove this module and redistribute
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-- a new release to the survivors by carrier pigeon.)
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list :: Annex [Git.Repo]
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list = return [Git.repoRemoteNameSet Git.repoFromUnknown "remote.web.dummy"]
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-- Dummy uuid for the whole web. Do not alter.
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webUUID :: UUID
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webUUID = "00000000-0000-0000-0000-000000000001"
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gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex (Remote Annex)
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gen r _ _ =
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return Remote {
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uuid = webUUID,
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cost = expensiveRemoteCost,
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name = Git.repoDescribe r,
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storeKey = uploadKey,
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retrieveKeyFile = downloadKey,
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removeKey = dropKey,
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hasKey = checkKey,
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hasKeyCheap = False,
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config = Nothing,
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repo = r
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}
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{- The urls for a key are stored in remote/web/hash/key.log
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- in the git-annex branch. -}
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urlLog :: Key -> FilePath
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urlLog key = "remote/web" </> hashDirLower key </> keyFile key ++ ".log"
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oldurlLog :: Key -> FilePath
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{- A bug used to store the urls elsewhere. -}
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oldurlLog key = "remote/web" </> hashDirLower key </> show key ++ ".log"
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getUrls :: Key -> Annex [URLString]
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getUrls key = do
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us <- currentLog (urlLog key)
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if null us
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then currentLog (oldurlLog key)
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else return us
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{- Records a change in an url for a key. -}
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setUrl :: Key -> URLString -> LogStatus -> Annex ()
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setUrl key url status = do
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g <- gitRepo
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addLog (urlLog key) =<< logNow status url
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-- update location log to indicate that the web has the key, or not
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us <- getUrls key
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logChange g key webUUID (if null us then InfoMissing else InfoPresent)
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downloadKey :: Key -> FilePath -> Annex Bool
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downloadKey key file = get =<< getUrls key
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where
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get [] = do
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warning "no known url"
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return False
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get urls = anyM (`Url.download` file) urls
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uploadKey :: Key -> Annex Bool
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uploadKey _ = do
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warning "upload to web not supported"
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return False
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dropKey :: Key -> Annex Bool
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dropKey _ = do
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warning "removal from web not supported"
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return False
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checkKey :: Key -> Annex (Either IOException Bool)
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checkKey key = do
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us <- getUrls key
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if null us
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then return $ Right False
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else return . Right =<< checkKey' us
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checkKey' :: [URLString] -> Annex Bool
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checkKey' [] = return False
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checkKey' (u:us) = do
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showAction $ "checking " ++ u
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e <- liftIO $ Url.exists u
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if e then return e else checkKey' us
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