128 lines
3.4 KiB
Haskell
128 lines
3.4 KiB
Haskell
{- git-annex toplevel code
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-}
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module Annex (
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State,
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startAnnex,
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annexFile,
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unannexFile
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) where
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import System.Posix.Files
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import System.Directory
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import GitRepo
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import Utility
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import Locations
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import Backend
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import BackendList
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import LocationLog
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-- git-annex's runtime state
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data State = State {
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repo :: GitRepo,
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gitconfig :: GitConfig
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}
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data GitConfig = GitConfig {
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annex_name :: String,
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annex_numcopies :: Int,
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annex_backends :: [Backend]
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}
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{- An annexed file's content is stored somewhere under .git/annex/ -}
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annexDir :: GitRepo -> Key -> IO FilePath
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annexDir repo key = do
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dir <- gitDir repo
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return $ dir ++ "/annex/" ++ key
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{- On startup, examine the git repo, prepare it, and record state for
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- later. -}
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startAnnex :: IO State
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startAnnex = do
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r <- gitRepoCurrent
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config <- getConfig r
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gitPrep r
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return State {
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repo = r,
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gitconfig = config
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}
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{- Query the git repo for relevant configuration settings. -}
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getConfig :: GitRepo -> IO GitConfig
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getConfig repo = do
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-- a name can be configured, if none is, use the repository path
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name <- gitConfigGet "annex.name" (gitRepoTop repo)
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-- default number of copies to keep of file contents is 1
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numcopies <- gitConfigGet "annex.numcopies" "1"
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backends <- gitConfigGet "annex.backends" ""
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return GitConfig {
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annex_name = name,
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annex_numcopies = read numcopies,
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annex_backends = parseBackendList backends
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}
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{- Annexes a file, storing it in a backend, and then moving it into
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- the annex directory and setting up the symlink pointing to its content. -}
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annexFile :: State -> FilePath -> IO ()
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annexFile state file = do
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alreadyannexed <- lookupBackend backends (repo state) file
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case (alreadyannexed) of
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Just _ -> error $ "already annexed: " ++ file
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Nothing -> do
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checkLegal file
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stored <- storeFile (annex_backends $ gitconfig state) (repo state) file
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case (stored) of
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Nothing -> error $ "no backend could store: " ++ file
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Just key -> symlink key
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where
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symlink key = do
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dest <- annexDir (repo state) key
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createDirectoryIfMissing True (parentDir dest)
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renameFile file dest
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createSymbolicLink dest file
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gitAdd (repo state) file
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checkLegal file = do
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s <- getSymbolicLinkStatus file
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if ((isSymbolicLink s) || (not $ isRegularFile s))
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then error $ "not a regular file: " ++ file
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else return ()
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backends = annex_backends $ gitconfig state
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{- Inverse of annexFile. -}
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unannexFile :: State -> FilePath -> IO ()
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unannexFile state file = do
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alreadyannexed <- lookupBackend backends (repo state) file
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case (alreadyannexed) of
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Nothing -> error $ "not annexed " ++ file
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Just _ -> do
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mkey <- dropFile backends (repo state) file
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case (mkey) of
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Nothing -> return ()
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Just key -> do
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src <- annexDir (repo state) key
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removeFile file
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renameFile src file
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return ()
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where
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backends = annex_backends $ gitconfig state
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{- Sets up a git repo for git-annex. May be called repeatedly. -}
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gitPrep :: GitRepo -> IO ()
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gitPrep repo = do
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-- configure git to use union merge driver on state files
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let attrLine = stateLoc ++ "/*.log merge=union"
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attributes <- gitAttributes repo
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exists <- doesFileExist attributes
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if (not exists)
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then do
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writeFile attributes $ attrLine ++ "\n"
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gitAdd repo attributes
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else do
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content <- readFile attributes
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if (all (/= attrLine) (lines content))
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then do
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appendFile attributes $ attrLine ++ "\n"
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gitAdd repo attributes
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else return ()
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