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