87 lines
2.5 KiB
Haskell
87 lines
2.5 KiB
Haskell
{- git-annex core functions -}
|
|
|
|
module Core where
|
|
|
|
import System.IO
|
|
import System.Directory
|
|
import Control.Monad.State (liftIO)
|
|
import Control.Exception
|
|
import CmdLine
|
|
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
|
|
|
|
{- Processes each param in the list by dispatching the handler function
|
|
- for the user-selection operation mode. Catches exceptions, not stopping
|
|
- if some error out, and propigates an overall error status at the end.
|
|
-
|
|
- This runs in the IO monad, not in the Annex monad. It seems that
|
|
- exceptions can only be caught in the IO monad, not in a stacked monad;
|
|
- or more likely I missed an easy way to do it. So, I have to laboriously
|
|
- thread AnnexState through this function.
|
|
-}
|
|
tryRun :: AnnexState -> Mode -> [String] -> IO ()
|
|
tryRun state mode params = tryRun' state mode 0 0 params
|
|
tryRun' state mode errnum oknum [] = do
|
|
if (errnum > 0)
|
|
then error $ (show errnum) ++ " failed ; " ++ show (oknum) ++ " ok"
|
|
else return ()
|
|
tryRun' state mode errnum oknum (f:fs) = do
|
|
result <- try
|
|
(Annex.run state (dispatch mode f))::IO (Either SomeException ((), AnnexState))
|
|
case (result) of
|
|
Left err -> do
|
|
showErr err
|
|
tryRun' state mode (errnum + 1) oknum fs
|
|
Right (_,state') -> tryRun' state' mode errnum (oknum + 1) fs
|
|
|
|
{- Exception pretty-printing. -}
|
|
showErr e = do
|
|
hPutStrLn stderr $ "git-annex: " ++ (show e)
|
|
return ()
|
|
|
|
{- 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]
|