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|
{- git-annex core functions
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Core where
import IO (try)
import System.Directory
import Control.Monad.State (liftIO)
import System.Path
import Control.Monad (when, unless, filterM)
import System.Posix.Files
import Data.Maybe
import Types
import Locations
import LocationLog
import UUID
import qualified GitRepo as Git
import qualified GitQueue
import qualified Annex
import qualified Backend
import Utility
import Messages
{- Runs a list of Annex actions. Catches IO errors and continues
- (but explicitly thrown errors terminate the whole command).
- Propigates an overall error status at the end.
-}
tryRun :: AnnexState -> [Annex Bool] -> IO ()
tryRun state actions = tryRun' state 0 actions
tryRun' :: AnnexState -> Integer -> [Annex Bool] -> IO ()
tryRun' state errnum (a:as) = do
result <- try $ Annex.run state a
case (result) of
Left err -> do
Annex.eval state $ showErr err
tryRun' state (errnum + 1) as
Right (True,state') -> tryRun' state' errnum as
Right (False,state') -> tryRun' state' (errnum + 1) as
tryRun' _ errnum [] =
when (errnum > 0) $ error $ show errnum ++ " failed"
{- Sets up a git repo for git-annex. -}
startup :: Annex Bool
startup = do
prepUUID
autoUpgrade
return True
{- When git-annex is done, it runs this. -}
shutdown :: Annex Bool
shutdown = do
g <- Annex.gitRepo
-- Runs all queued git commands.
q <- Annex.queueGet
unless (q == GitQueue.empty) $ do
verbose $ liftIO $ putStrLn "Recording state in git..."
liftIO $ GitQueue.run g q
-- clean up any files left in the temp directory, but leave
-- the tmp directory itself
let tmp = annexTmpLocation g
exists <- liftIO $ doesDirectoryExist tmp
when (exists) $ liftIO $ removeDirectoryRecursive tmp
liftIO $ createDirectoryIfMissing True tmp
return True
{- configure git to use union merge driver on state files, if it is not
- already -}
gitAttributes :: Git.Repo -> IO ()
gitAttributes repo = do
exists <- doesFileExist attributes
if (not exists)
then do
writeFile attributes $ attrLine ++ "\n"
commit
else do
content <- readFile attributes
when (all (/= attrLine) (lines content)) $ do
appendFile attributes $ attrLine ++ "\n"
commit
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]
{- set up a git pre-commit hook, if one is not already present -}
gitPreCommitHook :: Git.Repo -> IO ()
gitPreCommitHook repo = do
let hook = Git.workTree repo ++ "/" ++ Git.gitDir repo ++
"/hooks/pre-commit"
exists <- doesFileExist hook
if (exists)
then putStrLn $ "pre-commit hook (" ++ hook ++ ") already exists, not configuring"
else do
writeFile hook $ "#!/bin/sh\n" ++
"# automatically configured by git-annex\n" ++
"git annex pre-commit .\n"
p <- getPermissions hook
setPermissions hook $ p {executable = True}
{- Checks if a given key is currently present in the annexLocation. -}
inAnnex :: Key -> Annex Bool
inAnnex key = do
g <- Annex.gitRepo
when (Git.repoIsUrl g) $ error "inAnnex cannot check remote repo"
liftIO $ doesFileExist $ annexLocation g key
{- Calculates the relative path to use to link a file to a key. -}
calcGitLink :: FilePath -> Key -> Annex FilePath
calcGitLink file key = do
g <- Annex.gitRepo
cwd <- liftIO $ getCurrentDirectory
let absfile = case (absNormPath cwd file) of
Just f -> f
Nothing -> error $ "unable to normalize " ++ file
return $ relPathDirToDir (parentDir absfile) (Git.workTree g) ++
annexLocationRelative key
{- Updates the LocationLog when a key's presence changes. -}
logStatus :: Key -> LogStatus -> Annex ()
logStatus key status = do
g <- Annex.gitRepo
u <- getUUID g
logfile <- liftIO $ logChange g key u status
Annex.queue "add" [] logfile
{- Runs an action, passing it a temporary filename to download,
- and if the action succeeds, moves the temp file into
- the annex as a key's content. -}
getViaTmp :: Key -> (FilePath -> Annex Bool) -> Annex Bool
getViaTmp key action = do
g <- Annex.gitRepo
let dest = annexLocation g key
let tmp = annexTmpLocation g ++ keyFile key
liftIO $ createDirectoryIfMissing True (parentDir tmp)
success <- action tmp
if (success)
then do
liftIO $ renameFile tmp dest
logStatus key ValuePresent
return True
else do
-- the tmp file is left behind, in case caller wants
-- to resume its transfer
return False
{- List of keys whose content exists in .git/annex/objects/ -}
getKeysPresent :: Annex [Key]
getKeysPresent = do
g <- Annex.gitRepo
let top = annexObjectDir g
contents <- liftIO $ getDirectoryContents top
files <- liftIO $ filterM (isreg top) contents
return $ map fileKey files
where
isreg top f = do
s <- getFileStatus $ top ++ "/" ++ f
return $ isRegularFile s
{- List of keys referenced by symlinks in the git repo. -}
getKeysReferenced :: Annex [Key]
getKeysReferenced = do
g <- Annex.gitRepo
files <- liftIO $ Git.inRepo g $ Git.workTree g
keypairs <- mapM Backend.lookupFile files
return $ map fst $ catMaybes keypairs
{- Uses the annex.version git config setting to automate upgrades. -}
autoUpgrade :: Annex ()
autoUpgrade = do
g <- Annex.gitRepo
case Git.configGet g field "0" of
"0" -> do -- before there was repo versioning
upgradeNote "Upgrading object directory layout..."
setVersion
v | v == currentVersion -> return ()
_ -> error "this version of git-annex is too old for this git repository!"
where
currentVersion = "1"
setVersion = Annex.setConfig field currentVersion
field = "annex.version"
upgradeNote s = verbose $ liftIO $ putStrLn $ "("++s++")"
|
