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{- git-annex core functions -}
module Core where
import System.IO
import System.Directory
import Control.Monad.State (liftIO)
import Types
import BackendList
import Locations
import UUID
import qualified GitRepo as Git
import qualified Annex
{- Create and returns an Annex state object.
- Examines and prepares the git repo.
-}
start :: IO AnnexState
start = do
g <- Git.repoFromCwd
let s = Annex.new g
(_,s') <- Annex.run s (prep g)
return s'
where
prep g = do
-- setup git and read its config; update state
g' <- liftIO $ Git.configRead g
Annex.gitRepoChange g'
liftIO $ gitSetup g'
Annex.backendsChange $ parseBackendList $
Git.configGet g' "annex.backends" ""
prepUUID
{- Sets up a git repo for git-annex. May be called repeatedly. -}
gitSetup :: Git.Repo -> IO ()
gitSetup repo = do
-- configure git to use union merge driver on state files
exists <- doesFileExist attributes
if (not exists)
then do
writeFile attributes $ attrLine ++ "\n"
commit
else do
content <- readFile attributes
if (all (/= attrLine) (lines content))
then do
appendFile attributes $ attrLine ++ "\n"
commit
else return ()
where
attrLine = stateLoc ++ "/*.log merge=union"
attributes = Git.attributes repo
commit = do
Git.run repo ["add", attributes]
Git.run repo ["commit", "-m", "git-annex setup",
attributes]
{- Checks if a given key is currently present in the annexLocation -}
inAnnex :: Backend -> Key -> Annex Bool
inAnnex backend key = do
g <- Annex.gitRepo
liftIO $ doesFileExist $ annexLocation g backend key
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