e864c8d033
This pulls off quite a nice trick: When given a path on rsync.net, it determines if it is an encrypted git repository that the user has the key to decrypt, and merges with it. This is works even when the local repository had no idea that the gcrypt remote exists! (As previously done with local drives.) This commit sponsored by Pedro Côrte-Real
471 lines
16 KiB
Haskell
471 lines
16 KiB
Haskell
{- git-annex assistant webapp configurators for making local repositories
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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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 CPP, QuasiQuotes, TemplateHaskell, OverloadedStrings, RankNTypes, KindSignatures, TypeFamilies #-}
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module Assistant.WebApp.Configurators.Local where
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import Assistant.WebApp.Common
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import Assistant.WebApp.OtherRepos
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import Assistant.WebApp.Gpg
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import Assistant.MakeRemote
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import Assistant.Sync
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import Init
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import qualified Git
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import qualified Git.Construct
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import qualified Git.Config
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import qualified Git.Command
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import qualified Annex
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import Config.Files
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import Utility.FreeDesktop
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#ifdef WITH_CLIBS
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import Utility.Mounts
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#endif
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import Utility.DiskFree
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import Utility.DataUnits
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import Utility.Network
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import Remote (prettyUUID)
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import Annex.UUID
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import Types.StandardGroups
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import Logs.PreferredContent
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import Logs.UUID
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import Utility.UserInfo
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import Config
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import Utility.Gpg
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import qualified Annex.Branch
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import qualified Remote.GCrypt as GCrypt
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import qualified Types.Remote
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import qualified Data.Text as T
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import qualified Data.Map as M
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import Data.Char
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import Data.Ord
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import qualified Text.Hamlet as Hamlet
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data RepositoryPath = RepositoryPath Text
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deriving Show
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{- Custom field display for a RepositoryPath, with an icon etc.
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-
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- Validates that the path entered is not empty, and is a safe value
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- to use as a repository. -}
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#if MIN_VERSION_yesod(1,2,0)
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repositoryPathField :: forall (m :: * -> *). (MonadIO m, HandlerSite m ~ WebApp) => Bool -> Field m Text
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#else
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repositoryPathField :: forall sub. Bool -> Field sub WebApp Text
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#endif
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repositoryPathField autofocus = Field
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#if ! MIN_VERSION_yesod_form(1,2,0)
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{ fieldParse = parse
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#else
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{ fieldParse = \l _ -> parse l
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, fieldEnctype = UrlEncoded
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#endif
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, fieldView = view
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}
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where
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view idAttr nameAttr attrs val isReq =
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[whamlet|<input type="text" *{attrs} id="#{idAttr}" name="#{nameAttr}" :isReq:required :autofocus:autofocus value="#{either id id val}">|]
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parse [path]
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| T.null path = nopath
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| otherwise = liftIO $ checkRepositoryPath path
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parse [] = return $ Right Nothing
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parse _ = nopath
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nopath = return $ Left "Enter a location for the repository"
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{- As well as checking the path for a lot of silly things, tilde is
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- expanded in the returned path. -}
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checkRepositoryPath :: Text -> IO (Either (SomeMessage WebApp) (Maybe Text))
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checkRepositoryPath p = do
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home <- myHomeDir
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let basepath = expandTilde home $ T.unpack p
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path <- absPath basepath
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let parent = parentDir path
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problems <- catMaybes <$> mapM runcheck
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[ (return $ path == "/", "Enter the full path to use for the repository.")
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, (return $ all isSpace basepath, "A blank path? Seems unlikely.")
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, (doesFileExist path, "A file already exists with that name.")
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, (return $ path == home, "Sorry, using git-annex for your whole home directory is not currently supported.")
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, (not <$> doesDirectoryExist parent, "Parent directory does not exist.")
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, (not <$> canWrite path, "Cannot write a repository there.")
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]
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return $
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case headMaybe problems of
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Nothing -> Right $ Just $ T.pack basepath
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Just prob -> Left prob
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where
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runcheck (chk, msg) = ifM (chk) ( return $ Just msg, return Nothing )
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expandTilde home ('~':'/':path) = home </> path
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expandTilde _ path = path
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{- On first run, if run in the home directory, default to putting it in
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- ~/Desktop/annex, when a Desktop directory exists, and ~/annex otherwise.
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-
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- If run in another directory, that the user can write to,
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- the user probably wants to put it there. Unless that directory
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- contains a git-annex file, in which case the user has probably
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- browsed to a directory with git-annex and run it from there. -}
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defaultRepositoryPath :: Bool -> IO FilePath
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defaultRepositoryPath firstrun = do
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cwd <- liftIO $ getCurrentDirectory
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home <- myHomeDir
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if home == cwd && firstrun
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then inhome
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else ifM (legit cwd <&&> canWrite cwd)
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( return cwd
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, inhome
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)
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where
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inhome = do
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desktop <- userDesktopDir
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ifM (doesDirectoryExist desktop)
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( relHome $ desktop </> gitAnnexAssistantDefaultDir
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, return $ "~" </> gitAnnexAssistantDefaultDir
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)
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legit d = not <$> doesFileExist (d </> "git-annex")
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newRepositoryForm :: FilePath -> Hamlet.Html -> MkMForm RepositoryPath
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newRepositoryForm defpath msg = do
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(pathRes, pathView) <- mreq (repositoryPathField True) ""
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(Just $ T.pack $ addTrailingPathSeparator defpath)
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let (err, errmsg) = case pathRes of
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FormMissing -> (False, "")
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FormFailure l -> (True, concat $ map T.unpack l)
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FormSuccess _ -> (False, "")
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let form = do
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webAppFormAuthToken
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$(widgetFile "configurators/newrepository/form")
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return (RepositoryPath <$> pathRes, form)
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{- Making the first repository, when starting the webapp for the first time. -}
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getFirstRepositoryR :: Handler Html
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getFirstRepositoryR = postFirstRepositoryR
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postFirstRepositoryR :: Handler Html
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postFirstRepositoryR = page "Getting started" (Just Configuration) $ do
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#ifdef __ANDROID__
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androidspecial <- liftIO $ doesDirectoryExist "/sdcard/DCIM"
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let path = "/sdcard/annex"
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#else
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let androidspecial = False
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path <- liftIO . defaultRepositoryPath =<< liftH inFirstRun
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#endif
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((res, form), enctype) <- liftH $ runFormPost $ newRepositoryForm path
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case res of
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FormSuccess (RepositoryPath p) -> liftH $
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startFullAssistant (T.unpack p) ClientGroup Nothing
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_ -> $(widgetFile "configurators/newrepository/first")
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getAndroidCameraRepositoryR :: Handler ()
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getAndroidCameraRepositoryR =
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startFullAssistant "/sdcard/DCIM" SourceGroup $ Just addignore
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where
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addignore = do
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liftIO $ unlessM (doesFileExist ".gitignore") $
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writeFile ".gitignore" ".thumbnails/*"
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void $ inRepo $
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Git.Command.runBool [Param "add", File ".gitignore"]
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{- Adding a new local repository, which may be entirely separate, or may
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- be connected to the current repository. -}
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getNewRepositoryR :: Handler Html
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getNewRepositoryR = postNewRepositoryR
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postNewRepositoryR :: Handler Html
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postNewRepositoryR = page "Add another repository" (Just Configuration) $ do
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home <- liftIO myHomeDir
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((res, form), enctype) <- liftH $ runFormPost $ newRepositoryForm home
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case res of
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FormSuccess (RepositoryPath p) -> do
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let path = T.unpack p
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isnew <- liftIO $ makeRepo path False
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u <- liftIO $ initRepo isnew True path Nothing
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liftH $ liftAnnexOr () $ setStandardGroup u ClientGroup
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liftIO $ addAutoStartFile path
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liftIO $ startAssistant path
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askcombine u path
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_ -> $(widgetFile "configurators/newrepository")
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where
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askcombine newrepouuid newrepopath = do
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newrepo <- liftIO $ relHome newrepopath
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mainrepo <- fromJust . relDir <$> liftH getYesod
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$(widgetFile "configurators/newrepository/combine")
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getCombineRepositoryR :: FilePath -> UUID -> Handler Html
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getCombineRepositoryR newrepopath newrepouuid = do
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r <- combineRepos newrepopath remotename
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liftAssistant $ syncRemote r
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redirect $ EditRepositoryR newrepouuid
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where
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remotename = takeFileName newrepopath
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selectDriveForm :: [RemovableDrive] -> Hamlet.Html -> MkMForm RemovableDrive
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selectDriveForm drives = renderBootstrap $ RemovableDrive
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<$> pure Nothing
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<*> areq (selectFieldList pairs) "Select drive:" Nothing
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<*> areq textField "Use this directory on the drive:"
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(Just $ T.pack gitAnnexAssistantDefaultDir)
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where
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pairs = zip (map describe drives) (map mountPoint drives)
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describe drive = case diskFree drive of
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Nothing -> mountPoint drive
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Just free ->
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let sz = roughSize storageUnits True free
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in T.unwords
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[ mountPoint drive
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, T.concat ["(", T.pack sz]
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, "free)"
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]
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removableDriveRepository :: RemovableDrive -> FilePath
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removableDriveRepository drive =
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T.unpack (mountPoint drive) </> T.unpack (driveRepoPath drive)
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{- Adding a removable drive. -}
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getAddDriveR :: Handler Html
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getAddDriveR = postAddDriveR
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postAddDriveR :: Handler Html
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postAddDriveR = page "Add a removable drive" (Just Configuration) $ do
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removabledrives <- liftIO $ driveList
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writabledrives <- liftIO $
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filterM (canWrite . T.unpack . mountPoint) removabledrives
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((res, form), enctype) <- liftH $ runFormPost $
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selectDriveForm (sort writabledrives)
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case res of
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FormSuccess drive -> liftH $ redirect $ ConfirmAddDriveR drive
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_ -> $(widgetFile "configurators/adddrive")
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{- The repo may already exist, when adding removable media
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- that has already been used elsewhere. If so, check
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- the UUID of the repo and see if it's one we know. If not,
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- the user must confirm the repository merge.
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-
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- If the repo does not already exist on the drive, prompt about
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- encryption. -}
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getConfirmAddDriveR :: RemovableDrive -> Handler Html
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getConfirmAddDriveR drive = ifM (liftIO $ probeRepoExists dir)
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( do
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mu <- liftIO $ probeUUID dir
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case mu of
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Nothing -> maybe askcombine isknownuuid
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=<< liftAnnex (probeGCryptRemoteUUID dir)
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Just driveuuid -> isknownuuid driveuuid
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, newrepo
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)
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where
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dir = removableDriveRepository drive
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newrepo = do
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secretkeys <- sortBy (comparing snd) . M.toList
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<$> liftIO secretKeys
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page "Encrypt repository?" (Just Configuration) $
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$(widgetFile "configurators/adddrive/encrypt")
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knownrepo = getFinishAddDriveR drive NoRepoKey
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askcombine = page "Combine repositories?" (Just Configuration) $
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$(widgetFile "configurators/adddrive/combine")
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isknownuuid driveuuid =
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ifM (M.member driveuuid <$> liftAnnex uuidMap)
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( knownrepo
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, askcombine
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)
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setupDriveModal :: Widget
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setupDriveModal = $(widgetFile "configurators/adddrive/setupmodal")
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getGenKeyForDriveR :: RemovableDrive -> Handler Html
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getGenKeyForDriveR drive = withNewSecretKey $ \keyid -> do
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{- Generating a key takes a long time, and
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- the removable drive may have been disconnected
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- in the meantime. Check that it is still mounted
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- before finishing. -}
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ifM (liftIO $ any (\d -> mountPoint d == mountPoint drive) <$> driveList)
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( getFinishAddDriveR drive (RepoKey keyid)
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, getAddDriveR
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)
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getFinishAddDriveR :: RemovableDrive -> RepoKey -> Handler Html
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getFinishAddDriveR drive = go
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where
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{- Set up new gcrypt special remote. -}
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go (RepoKey keyid) = whenGcryptInstalled $ makewith $ const $ do
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r <- liftAnnex $ addRemote $
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makeGCryptRemote remotename dir keyid
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return (Types.Remote.uuid r, r)
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go NoRepoKey = checkGCryptRepoEncryption dir makeunencrypted $ do
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mu <- liftAnnex $ probeGCryptRemoteUUID dir
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case mu of
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Just u -> enableexistinggcryptremote u
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Nothing -> error "The drive contains a gcrypt repository that is not a git-annex special remote. This is not supported."
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enableexistinggcryptremote u = do
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remotename' <- liftAnnex $ getGCryptRemoteName u dir
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makewith $ const $ do
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r <- liftAnnex $ addRemote $
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enableSpecialRemote remotename' GCrypt.remote $ M.fromList
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[("gitrepo", dir)]
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return (u, r)
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{- Making a new unencrypted repo, or combining with an existing one. -}
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makeunencrypted = makewith $ \isnew -> (,)
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<$> liftIO (initRepo isnew False dir $ Just remotename)
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<*> combineRepos dir remotename
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makewith a = do
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liftIO $ createDirectoryIfMissing True dir
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isnew <- liftIO $ makeRepo dir True
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{- Removable drives are not reliable media, so enable fsync. -}
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liftIO $ inDir dir $
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setConfig (ConfigKey "core.fsyncobjectfiles")
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(Git.Config.boolConfig True)
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(u, r) <- a isnew
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liftAnnex $ setStandardGroup u TransferGroup
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liftAssistant $ syncRemote r
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redirect $ EditNewRepositoryR u
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mountpoint = T.unpack (mountPoint drive)
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dir = removableDriveRepository drive
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remotename = takeFileName mountpoint
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{- Each repository is made a remote of the other.
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- Next call syncRemote to get them in sync. -}
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combineRepos :: FilePath -> String -> Handler Remote
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combineRepos dir name = liftAnnex $ do
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hostname <- maybe "host" id <$> liftIO getHostname
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hostlocation <- fromRepo Git.repoLocation
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liftIO $ inDir dir $ void $ makeGitRemote hostname hostlocation
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addRemote $ makeGitRemote name dir
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getEnableDirectoryR :: UUID -> Handler Html
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getEnableDirectoryR uuid = page "Enable a repository" (Just Configuration) $ do
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description <- liftAnnex $ T.pack <$> prettyUUID uuid
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$(widgetFile "configurators/enabledirectory")
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{- List of removable drives. -}
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driveList :: IO [RemovableDrive]
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#ifdef WITH_CLIBS
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driveList = mapM (gen . mnt_dir) =<< filter sane <$> getMounts
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where
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gen dir = RemovableDrive
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<$> getDiskFree dir
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<*> pure (T.pack dir)
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<*> pure (T.pack gitAnnexAssistantDefaultDir)
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-- filter out some things that are surely not removable drives
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sane Mntent { mnt_dir = dir, mnt_fsname = dev }
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{- We want real disks like /dev/foo, not
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- dummy mount points like proc or tmpfs or
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- gvfs-fuse-daemon. -}
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| not ('/' `elem` dev) = False
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{- Just in case: These mount points are surely not
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- removable disks. -}
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| dir == "/" = False
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| dir == "/tmp" = False
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| dir == "/run/shm" = False
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| dir == "/run/lock" = False
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#ifdef __ANDROID__
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| dir == "/mnt/sdcard" = False
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| dir == "/sdcard" = False
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#endif
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| otherwise = True
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#else
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driveList = return []
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#endif
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{- Bootstraps from first run mode to a fully running assistant in a
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- repository, by running the postFirstRun callback, which returns the
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- url to the new webapp. -}
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startFullAssistant :: FilePath -> StandardGroup -> Maybe (Annex ())-> Handler ()
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startFullAssistant path repogroup setup = do
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webapp <- getYesod
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url <- liftIO $ do
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isnew <- makeRepo path False
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u <- initRepo isnew True path Nothing
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inDir path $ do
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setStandardGroup u repogroup
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maybe noop id setup
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addAutoStartFile path
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setCurrentDirectory path
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fromJust $ postFirstRun webapp
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redirect $ T.pack url
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{- Makes a new git repository. Or, if a git repository already
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- exists, returns False. -}
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makeRepo :: FilePath -> Bool -> IO Bool
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makeRepo path bare = ifM (probeRepoExists path)
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( return False
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, do
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(transcript, ok) <-
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processTranscript "git" (toCommand params) Nothing
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unless ok $
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error $ "git init failed!\nOutput:\n" ++ transcript
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return True
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)
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where
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baseparams = [Param "init", Param "--quiet"]
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params
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| bare = baseparams ++ [Param "--bare", File path]
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| otherwise = baseparams ++ [File path]
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{- Runs an action in the git repository in the specified directory. -}
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inDir :: FilePath -> Annex a -> IO a
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inDir dir a = do
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state <- Annex.new =<< Git.Config.read =<< Git.Construct.fromPath dir
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Annex.eval state a
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{- Creates a new repository, and returns its UUID. -}
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initRepo :: Bool -> Bool -> FilePath -> Maybe String -> IO UUID
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initRepo True primary_assistant_repo dir desc = inDir dir $ do
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initRepo' desc
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{- Initialize the master branch, so things that expect
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- to have it will work, before any files are added. -}
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unlessM (Git.Config.isBare <$> gitRepo) $
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void $ inRepo $ Git.Command.runBool
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[ Param "commit"
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, Param "--quiet"
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, Param "--allow-empty"
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, Param "-m"
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, Param "created repository"
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]
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{- Repositories directly managed by the assistant use direct mode.
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-
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- Automatic gc is disabled, as it can be slow. Insted, gc is done
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- once a day.
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-}
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when primary_assistant_repo $ do
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setDirect True
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inRepo $ Git.Command.run
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[Param "config", Param "gc.auto", Param "0"]
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getUUID
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{- Repo already exists, could be a non-git-annex repo though. -}
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initRepo False _ dir desc = inDir dir $ do
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initRepo' desc
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getUUID
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initRepo' :: Maybe String -> Annex ()
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initRepo' desc = do
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unlessM isInitialized $ do
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initialize desc
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{- Ensure branch gets committed right away so it is
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- available for merging when a removable drive repo is being
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- added. -}
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Annex.Branch.commit "update"
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{- Checks if the user can write to a directory.
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-
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- The directory may be in the process of being created; if so
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- the parent directory is checked instead. -}
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canWrite :: FilePath -> IO Bool
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canWrite dir = do
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tocheck <- ifM (doesDirectoryExist dir)
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(return dir, return $ parentDir dir)
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catchBoolIO $ fileAccess tocheck False True False
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{- Checks if a git repo exists at a location. -}
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probeRepoExists :: FilePath -> IO Bool
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probeRepoExists dir = isJust <$>
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catchDefaultIO Nothing (Git.Construct.checkForRepo dir)
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{- Gets the UUID of the git repo at a location, which may not exist, or
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- not be a git-annex repo. -}
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probeUUID :: FilePath -> IO (Maybe UUID)
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probeUUID dir = catchDefaultIO Nothing $ inDir dir $ do
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u <- getUUID
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return $ if u == NoUUID then Nothing else Just u
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