99 lines
2.8 KiB
Haskell
99 lines
2.8 KiB
Haskell
{- git repository handling -}
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module GitRepo where
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import Directory
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import System.Directory
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import System.Path
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import Data.String.Utils
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import Utility
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{- Long-term state is stored in files inside the .git-annex directory
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- in the git repository. -}
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stateLoc = ".git-annex"
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gitStateDir :: String -> String
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gitStateDir repo = repo ++ "/" ++ stateLoc ++ "/"
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{- Path to the current repository's gitattributes file. -}
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gitAttributes :: IO String
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gitAttributes = do
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repo <- repoTop
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bare <- isBareRepo repo
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if (bare)
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then return $ repo ++ "/info/.gitattributes"
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else return $ repo ++ "/.gitattributes"
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{- Path to the current repository's .git directory.
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- (For a bare repository, that is the root of the repository.)
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- TODO: support GIT_DIR -}
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gitDir :: IO String
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gitDir = do
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repo <- repoTop
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bare <- isBareRepo repo
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if (bare)
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then return $ repo
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else return $ repo ++ "/.git"
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{- Given a relative or absolute filename, calculates the name to use
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- relative to a git repository directory (which must be absolute).
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- This is the same form displayed and used by git. -}
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gitRelative :: String -> String -> String
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gitRelative repo file = drop (length absrepo) absfile
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where
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-- normalize both repo and file, so that repo
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-- will be substring of file
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absrepo = case (absNormPath "/" repo) of
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Just f -> f ++ "/"
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Nothing -> error $ "bad repo" ++ repo
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absfile = case (secureAbsNormPath absrepo file) of
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Just f -> f
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Nothing -> error $ file ++ " is not located inside git repository " ++ absrepo
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{- Sets up the current git repo for git-annex. May be called repeatedly. -}
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gitPrep :: IO ()
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gitPrep = do
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-- configure git to use union merge driver on state files
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let attrLine = stateLoc ++ "/* merge=union"
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attributes <- gitAttributes
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exists <- doesFileExist attributes
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if (not exists)
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then writeFile attributes $ attrLine ++ "\n"
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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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-- TODO check attributes file into git?
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else return ()
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{- Finds the top of the current git repository, which may be in a parent
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- directory. -}
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repoTop :: IO String
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repoTop = do
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cwd <- getCurrentDirectory
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top <- seekUp cwd isRepoTop
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case top of
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(Just dir) -> return dir
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Nothing -> error "Not in a git repository."
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seekUp :: String -> (String -> IO Bool) -> IO (Maybe String)
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seekUp dir want = do
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ok <- want dir
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if ok
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then return (Just dir)
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else case (parentDir dir) of
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"" -> return Nothing
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d -> seekUp d want
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isRepoTop dir = do
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r <- isGitRepo dir
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b <- isBareRepo dir
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return (r || b)
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isGitRepo dir = gitSignature dir ".git" ".git/config"
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isBareRepo dir = gitSignature dir "objects" "config"
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gitSignature dir subdir file = do
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s <- (doesDirectoryExist (dir ++ "/" ++ subdir))
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f <- (doesFileExist (dir ++ "/" ++ file))
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return (s && f)
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