b4d5c10fb7
Fixed the laziness space leak, so it runs in 60 mb or so again. Slightly faster due to using Data.Set.difference now, although this also makes it use slightly more memory. Also added display of the refs being checked, and made unused --from also check all refs for things in the remote.
713 lines
22 KiB
Haskell
713 lines
22 KiB
Haskell
{- git repository handling
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-
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- This is written to be completely independant of git-annex and should be
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- suitable for other uses.
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-
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- Copyright 2010,2011 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Git (
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Repo,
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repoFromCwd,
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repoFromAbsPath,
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repoFromUnknown,
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repoFromUrl,
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localToUrl,
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repoIsUrl,
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repoIsSsh,
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repoIsHttp,
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repoIsLocalBare,
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repoDescribe,
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refDescribe,
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repoLocation,
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workTree,
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workTreeFile,
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gitDir,
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urlPath,
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urlHost,
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urlPort,
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urlHostUser,
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urlAuthority,
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urlScheme,
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configGet,
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configMap,
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configRead,
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hConfigRead,
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configStore,
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configTrue,
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gitCommandLine,
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run,
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runBool,
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pipeRead,
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pipeWrite,
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pipeWriteRead,
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pipeNullSplit,
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attributes,
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remotes,
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remotesAdd,
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repoRemoteName,
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repoRemoteNameSet,
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checkAttr,
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decodeGitFile,
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encodeGitFile,
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repoAbsPath,
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reap,
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useIndex,
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hashObject,
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getSha,
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shaSize,
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commit,
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prop_idempotent_deencode
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) where
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import Control.Monad (unless, when, liftM2)
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import Control.Applicative
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import System.Directory
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import System.FilePath
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import System.Posix.Directory
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import System.Posix.User
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import System.Posix.Process
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import System.Path
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import System.Cmd.Utils
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import IO (bracket_, try)
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import Data.String.Utils
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import System.IO
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import qualified Data.Map as M hiding (map, split)
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import Network.URI
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import Data.Maybe
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import Data.Char
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import Data.Word (Word8)
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import Codec.Binary.UTF8.String (encode)
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import Text.Printf
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import Data.List (isInfixOf, isPrefixOf, isSuffixOf)
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import System.Exit
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import System.Posix.Env (setEnv, unsetEnv, getEnv)
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import Utility
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import Utility.Path
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import Utility.Conditional
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import Utility.SafeCommand
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{- There are two types of repositories; those on local disk and those
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- accessed via an URL. -}
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data RepoLocation = Dir FilePath | Url URI | Unknown
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deriving (Show, Eq)
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data Repo = Repo {
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location :: RepoLocation,
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config :: M.Map String String,
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remotes :: [Repo],
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-- remoteName holds the name used for this repo in remotes
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remoteName :: Maybe String
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} deriving (Show, Eq)
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newFrom :: RepoLocation -> Repo
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newFrom l =
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Repo {
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location = l,
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config = M.empty,
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remotes = [],
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remoteName = Nothing
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}
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{- Local Repo constructor, requires an absolute path to the repo be
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- specified. -}
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repoFromAbsPath :: FilePath -> IO Repo
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repoFromAbsPath dir
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| "/" `isPrefixOf` dir = do
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-- Git always looks for "dir.git" in preference to
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-- to "dir", even if dir ends in a "/".
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let canondir = dropTrailingPathSeparator dir
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let dir' = canondir ++ ".git"
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e <- doesDirectoryExist dir'
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if e
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then ret dir'
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else if "/.git" `isSuffixOf` canondir
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then do
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-- When dir == "foo/.git", git looks
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-- for "foo/.git/.git", and failing
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-- that, uses "foo" as the repository.
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e' <- doesDirectoryExist $ dir </> ".git"
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if e'
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then ret dir
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else ret $ takeDirectory canondir
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else ret dir
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| otherwise = error $ "internal error, " ++ dir ++ " is not absolute"
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where
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ret = return . newFrom . Dir
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{- Remote Repo constructor. Throws exception on invalid url. -}
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repoFromUrl :: String -> IO Repo
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repoFromUrl url
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| startswith "file://" url = repoFromAbsPath $ uriPath u
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| otherwise = return $ newFrom $ Url u
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where
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u = fromMaybe bad $ parseURI url
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bad = error $ "bad url " ++ url
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{- Creates a repo that has an unknown location. -}
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repoFromUnknown :: Repo
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repoFromUnknown = newFrom Unknown
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{- Converts a Local Repo into a remote repo, using the reference repo
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- which is assumed to be on the same host. -}
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localToUrl :: Repo -> Repo -> Repo
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localToUrl reference r
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| not $ repoIsUrl reference = error "internal error; reference repo not url"
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| repoIsUrl r = r
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| otherwise = r { location = Url $ fromJust $ parseURI absurl }
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where
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absurl =
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urlScheme reference ++ "//" ++
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urlAuthority reference ++
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workTree r
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{- User-visible description of a git repo. -}
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repoDescribe :: Repo -> String
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repoDescribe Repo { remoteName = Just name } = name
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repoDescribe Repo { location = Url url } = show url
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repoDescribe Repo { location = Dir dir } = dir
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repoDescribe Repo { location = Unknown } = "UNKNOWN"
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{- Converts a fully qualified git ref into a user-visible version -}
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refDescribe :: String -> String
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refDescribe = remove "refs/heads/" . remove "refs/remotes/"
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where
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remove prefix s
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| prefix `isPrefixOf` s = drop (length prefix) s
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| otherwise = s
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{- Location of the repo, either as a path or url. -}
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repoLocation :: Repo -> String
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repoLocation Repo { location = Url url } = show url
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repoLocation Repo { location = Dir dir } = dir
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repoLocation Repo { location = Unknown } = undefined
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{- Constructs and returns an updated version of a repo with
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- different remotes list. -}
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remotesAdd :: Repo -> [Repo] -> Repo
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remotesAdd repo rs = repo { remotes = rs }
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{- Returns the name of the remote that corresponds to the repo, if
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- it is a remote. -}
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repoRemoteName :: Repo -> Maybe String
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repoRemoteName Repo { remoteName = Just name } = Just name
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repoRemoteName _ = Nothing
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{- Sets the name of a remote based on the git config key, such as
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"remote.foo.url". -}
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repoRemoteNameSet :: Repo -> String -> Repo
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repoRemoteNameSet r k = r { remoteName = Just basename }
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where
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basename = join "." $ reverse $ drop 1 $
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reverse $ drop 1 $ split "." k
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{- Some code needs to vary between URL and normal repos,
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- or bare and non-bare, these functions help with that. -}
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repoIsUrl :: Repo -> Bool
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repoIsUrl Repo { location = Url _ } = True
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repoIsUrl _ = False
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repoIsSsh :: Repo -> Bool
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repoIsSsh Repo { location = Url url }
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| uriScheme url == "ssh:" = True
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-- git treats these the same as ssh
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| uriScheme url == "git+ssh:" = True
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| uriScheme url == "ssh+git:" = True
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| otherwise = False
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repoIsSsh _ = False
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repoIsHttp :: Repo -> Bool
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repoIsHttp Repo { location = Url url }
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| uriScheme url == "http:" = True
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| uriScheme url == "https:" = True
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| otherwise = False
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repoIsHttp _ = False
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configAvail ::Repo -> Bool
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configAvail Repo { config = c } = c /= M.empty
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repoIsLocalBare :: Repo -> Bool
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repoIsLocalBare r@(Repo { location = Dir _ }) = configAvail r && configBare r
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repoIsLocalBare _ = False
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assertLocal :: Repo -> a -> a
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assertLocal repo action =
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if not $ repoIsUrl repo
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then action
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else error $ "acting on URL git repo " ++ repoDescribe repo ++
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" not supported"
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assertUrl :: Repo -> a -> a
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assertUrl repo action =
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if repoIsUrl repo
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then action
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else error $ "acting on local git repo " ++ repoDescribe repo ++
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" not supported"
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configBare :: Repo -> Bool
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configBare repo = maybe unknown configTrue $ M.lookup "core.bare" $ config repo
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where
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unknown = error $ "it is not known if git repo " ++
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repoDescribe repo ++
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" is a bare repository; config not read"
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{- Path to a repository's gitattributes file. -}
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attributes :: Repo -> String
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attributes repo
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| configBare repo = workTree repo ++ "/info/.gitattributes"
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| otherwise = workTree repo ++ "/.gitattributes"
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{- Path to a repository's .git directory. -}
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gitDir :: Repo -> String
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gitDir repo
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| configBare repo = workTree repo
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| otherwise = workTree repo </> ".git"
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{- Path to a repository's --work-tree, that is, its top.
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-
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- Note that for URL repositories, this is the path on the remote host. -}
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workTree :: Repo -> FilePath
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workTree r@(Repo { location = Url _ }) = urlPath r
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workTree (Repo { location = Dir d }) = d
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workTree Repo { location = Unknown } = undefined
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{- Given a relative or absolute filename inside a git repository's
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- workTree, calculates the name to use to refer to that file to git.
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-
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- This is complicated because the best choice can vary depending on
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- whether the cwd is in a subdirectory of the git repository, or not.
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-
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- For example, when adding a file "/tmp/repo/foo", it's best to refer
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- to it as "foo" if the cwd is outside the repository entirely
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- (this avoids a gotcha with using the full path name when /tmp/repo
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- is itself a symlink). But, if the cwd is "/tmp/repo/subdir",
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- it's best to refer to "../foo".
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-}
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workTreeFile :: Repo -> FilePath -> IO FilePath
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workTreeFile repo@(Repo { location = Dir d }) file = do
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cwd <- getCurrentDirectory
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let file' = absfile cwd
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unless (inrepo file') $
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error $ file ++ " is not located inside git repository " ++ absrepo
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if inrepo $ addTrailingPathSeparator cwd
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then return $ relPathDirToFile cwd file'
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else return $ drop (length absrepo) file'
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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 = maybe bad addTrailingPathSeparator $ absNormPath "/" d
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absfile c = fromMaybe file $ secureAbsNormPath c file
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inrepo f = absrepo `isPrefixOf` f
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bad = error $ "bad repo" ++ repoDescribe repo
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workTreeFile repo _ = assertLocal repo $ error "internal"
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{- Path of an URL repo. -}
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urlPath :: Repo -> String
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urlPath Repo { location = Url u } = uriPath u
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urlPath repo = assertUrl repo $ error "internal"
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{- Scheme of an URL repo. -}
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urlScheme :: Repo -> String
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urlScheme Repo { location = Url u } = uriScheme u
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urlScheme repo = assertUrl repo $ error "internal"
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{- Work around a bug in the real uriRegName
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- <http://trac.haskell.org/network/ticket/40> -}
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uriRegName' :: URIAuth -> String
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uriRegName' a = fixup $ uriRegName a
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where
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fixup x@('[':rest)
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| rest !! len == ']' = take len rest
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| otherwise = x
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where
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len = length rest - 1
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fixup x = x
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{- Hostname of an URL repo. -}
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urlHost :: Repo -> String
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urlHost = urlAuthPart uriRegName'
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{- Port of an URL repo, if it has a nonstandard one. -}
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urlPort :: Repo -> Maybe Integer
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urlPort r =
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case urlAuthPart uriPort r of
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":" -> Nothing
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(':':p) -> Just (read p)
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_ -> Nothing
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{- Hostname of an URL repo, including any username (ie, "user@host") -}
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urlHostUser :: Repo -> String
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urlHostUser r = urlAuthPart uriUserInfo r ++ urlAuthPart uriRegName' r
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{- The full authority portion an URL repo. (ie, "user@host:port") -}
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urlAuthority :: Repo -> String
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urlAuthority r = flip urlAuthPart r $ \a ->
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uriUserInfo a ++ uriRegName' a ++ uriPort a
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{- Applies a function to extract part of the uriAuthority of an URL repo. -}
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urlAuthPart :: (URIAuth -> a) -> Repo -> a
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urlAuthPart a Repo { location = Url u } = a auth
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where
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auth = fromMaybe (error $ "bad url " ++ show u) (uriAuthority u)
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urlAuthPart _ repo = assertUrl repo $ error "internal"
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{- Constructs a git command line operating on the specified repo. -}
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gitCommandLine :: Repo -> [CommandParam] -> [CommandParam]
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gitCommandLine repo@(Repo { location = Dir _ } ) params =
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-- force use of specified repo via --git-dir and --work-tree
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[ Param ("--git-dir=" ++ gitDir repo)
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, Param ("--work-tree=" ++ workTree repo)
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] ++ params
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gitCommandLine repo _ = assertLocal repo $ error "internal"
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{- Runs git in the specified repo. -}
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runBool :: Repo -> String -> [CommandParam] -> IO Bool
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runBool repo subcommand params = assertLocal repo $
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boolSystem "git" $ gitCommandLine repo $ Param subcommand : params
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{- Runs git in the specified repo, throwing an error if it fails. -}
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run :: Repo -> String -> [CommandParam] -> IO ()
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run repo subcommand params = assertLocal repo $
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runBool repo subcommand params
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>>! error $ "git " ++ show params ++ " failed"
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{- Runs a git subcommand and returns its output, lazily.
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-
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- Note that this leaves the git process running, and so zombies will
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- result unless reap is called.
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-}
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pipeRead :: Repo -> [CommandParam] -> IO String
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pipeRead repo params = assertLocal repo $ do
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(_, s) <- pipeFrom "git" $ toCommand $ gitCommandLine repo params
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return s
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{- Runs a git subcommand, feeding it input.
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- You should call either getProcessStatus or forceSuccess on the PipeHandle. -}
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pipeWrite :: Repo -> [CommandParam] -> String -> IO PipeHandle
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pipeWrite repo params s = assertLocal repo $
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pipeTo "git" (toCommand $ gitCommandLine repo params) s
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{- Runs a git subcommand, feeding it input, and returning its output.
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- You should call either getProcessStatus or forceSuccess on the PipeHandle. -}
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pipeWriteRead :: Repo -> [CommandParam] -> String -> IO (PipeHandle, String)
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pipeWriteRead repo params s = assertLocal repo $
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pipeBoth "git" (toCommand $ gitCommandLine repo params) s
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{- Reaps any zombie git processes. -}
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reap :: IO ()
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reap = do
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-- throws an exception when there are no child processes
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r <- catch (getAnyProcessStatus False True) (\_ -> return Nothing)
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maybe (return ()) (const reap) r
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{- Forces git to use the specified index file.
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- Returns an action that will reset back to the default
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- index file. -}
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useIndex :: FilePath -> IO (IO ())
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useIndex index = do
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res <- try $ getEnv var
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setEnv var index True
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return $ reset res
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where
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var = "GIT_INDEX_FILE"
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reset (Right (Just v)) = setEnv var v True
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reset _ = unsetEnv var
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{- Injects some content into git, returning its hash. -}
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hashObject :: Repo -> String -> IO String
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hashObject repo content = getSha subcmd $ do
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(h, s) <- pipeWriteRead repo (map Param params) content
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length s `seq` do
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forceSuccess h
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reap -- XXX unsure why this is needed
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return s
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where
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subcmd = "hash-object"
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params = [subcmd, "-w", "--stdin"]
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{- Runs an action that causes a git subcommand to emit a sha, and strips
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any trailing newline, returning the sha. -}
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getSha :: String -> IO String -> IO String
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getSha subcommand a = do
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t <- a
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let t' = if last t == '\n'
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then init t
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else t
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when (length t' /= shaSize) $
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error $ "failed to read sha from git " ++ subcommand ++ " (" ++ t' ++ ")"
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return t'
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{- Size of a git sha. -}
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shaSize :: Int
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shaSize = 40
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{- Commits the index into the specified branch,
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- with the specified parent refs. -}
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commit :: Repo -> String -> String -> [String] -> IO ()
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commit g message newref parentrefs = do
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tree <- getSha "write-tree" $
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pipeRead g [Param "write-tree"]
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sha <- getSha "commit-tree" $ ignorehandle $
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pipeWriteRead g (map Param $ ["commit-tree", tree] ++ ps) message
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run g "update-ref" [Param newref, Param sha]
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where
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ignorehandle a = snd <$> a
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ps = concatMap (\r -> ["-p", r]) parentrefs
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{- Reads null terminated output of a git command (as enabled by the -z
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- parameter), and splits it into a list of files/lines/whatever. -}
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pipeNullSplit :: Repo -> [CommandParam] -> IO [FilePath]
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pipeNullSplit repo params = filter (not . null) . split "\0" <$>
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pipeRead repo params
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{- Runs git config and populates a repo with its config. -}
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configRead :: Repo -> IO Repo
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configRead repo@(Repo { location = Dir d }) = do
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{- Cannot use pipeRead because it relies on the config having
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been already read. Instead, chdir to the repo. -}
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cwd <- getCurrentDirectory
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bracket_ (changeWorkingDirectory d)
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(\_ -> changeWorkingDirectory cwd) $
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pOpen ReadFromPipe "git" ["config", "--list"] $
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hConfigRead repo
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configRead r = assertLocal r $ error "internal"
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{- Reads git config from a handle and populates a repo with it. -}
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hConfigRead :: Repo -> Handle -> IO Repo
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hConfigRead repo h = do
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val <- hGetContentsStrict h
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configStore repo val
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{- Stores a git config into a repo, returning the new version of the repo.
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- The git config may be multiple lines, or a single line. Config settings
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- can be updated inrementally. -}
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configStore :: Repo -> String -> IO Repo
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configStore repo s = do
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let repo' = repo { config = configParse s `M.union` config repo }
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rs <- configRemotes repo'
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return $ repo' { remotes = rs }
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{- Parses git config --list output into a config map. -}
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configParse :: String -> M.Map String String
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configParse s = M.fromList $ map pair $ lines s
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where
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pair l = (key l, val l)
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key l = head $ keyval l
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val l = join sep $ drop 1 $ keyval l
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keyval l = split sep l :: [String]
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sep = "="
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{- Calculates a list of a repo's configured remotes, by parsing its config. -}
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configRemotes :: Repo -> IO [Repo]
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configRemotes repo = mapM construct remotepairs
|
|
where
|
|
remotepairs = M.toList $ filterremotes $ config repo
|
|
filterremotes = M.filterWithKey (\k _ -> isremote k)
|
|
isremote k = startswith "remote." k && endswith ".url" k
|
|
construct (k,v) = do
|
|
r <- gen v
|
|
return $ repoRemoteNameSet r k
|
|
gen v | scpstyle v = repoFromUrl $ scptourl v
|
|
| isURI v = repoFromUrl v
|
|
| otherwise = repoFromRemotePath v repo
|
|
-- git remotes can be written scp style -- [user@]host:dir
|
|
scpstyle v = ":" `isInfixOf` v && not ("//" `isInfixOf` v)
|
|
scptourl v = "ssh://" ++ host ++ slash dir
|
|
where
|
|
bits = split ":" v
|
|
host = head bits
|
|
dir = join ":" $ drop 1 bits
|
|
slash d | d == "" = "/~/" ++ dir
|
|
| head d == '/' = dir
|
|
| head d == '~' = '/':dir
|
|
| otherwise = "/~/" ++ dir
|
|
|
|
{- Checks if a string from git config is a true value. -}
|
|
configTrue :: String -> Bool
|
|
configTrue s = map toLower s == "true"
|
|
|
|
{- Returns a single git config setting, or a default value if not set. -}
|
|
configGet :: Repo -> String -> String -> String
|
|
configGet repo key defaultValue =
|
|
M.findWithDefault defaultValue key (config repo)
|
|
|
|
{- Access to raw config Map -}
|
|
configMap :: Repo -> M.Map String String
|
|
configMap = config
|
|
|
|
{- Efficiently looks up a gitattributes value for each file in a list. -}
|
|
checkAttr :: Repo -> String -> [FilePath] -> IO [(FilePath, String)]
|
|
checkAttr repo attr files = do
|
|
-- git check-attr wants files that are absolute (or relative to the
|
|
-- top of the repo). But we're passed files relative to the current
|
|
-- directory. Convert to absolute, and then convert the filenames
|
|
-- in its output back to relative.
|
|
cwd <- getCurrentDirectory
|
|
let top = workTree repo
|
|
let absfiles = map (absPathFrom cwd) files
|
|
(_, fromh, toh) <- hPipeBoth "git" (toCommand params)
|
|
_ <- forkProcess $ do
|
|
hClose fromh
|
|
hPutStr toh $ join "\0" absfiles
|
|
hClose toh
|
|
exitSuccess
|
|
hClose toh
|
|
s <- hGetContents fromh
|
|
return $ map (topair cwd top) $ lines s
|
|
where
|
|
params = gitCommandLine repo [Param "check-attr", Param attr, Params "-z --stdin"]
|
|
topair cwd top l = (relfile, value)
|
|
where
|
|
relfile
|
|
| startswith cwd' file = drop (length cwd') file
|
|
| otherwise = relPathDirToFile top' file
|
|
file = decodeGitFile $ join sep $ take end bits
|
|
value = bits !! end
|
|
end = length bits - 1
|
|
bits = split sep l
|
|
sep = ": " ++ attr ++ ": "
|
|
cwd' = cwd ++ "/"
|
|
top' = top ++ "/"
|
|
|
|
{- Some git commands output encoded filenames. Decode that (annoyingly
|
|
- complex) encoding. -}
|
|
decodeGitFile :: String -> FilePath
|
|
decodeGitFile [] = []
|
|
decodeGitFile f@(c:s)
|
|
-- encoded strings will be inside double quotes
|
|
| c == '"' = unescape ("", middle)
|
|
| otherwise = f
|
|
where
|
|
e = '\\'
|
|
middle = init s
|
|
unescape (b, []) = b
|
|
-- look for escapes starting with '\'
|
|
unescape (b, v) = b ++ beginning ++ unescape (decode rest)
|
|
where
|
|
pair = span (/= e) v
|
|
beginning = fst pair
|
|
rest = snd pair
|
|
isescape x = x == e
|
|
-- \NNN is an octal encoded character
|
|
decode (x:n1:n2:n3:rest)
|
|
| isescape x && alloctal = (fromoctal, rest)
|
|
where
|
|
alloctal = isOctDigit n1 &&
|
|
isOctDigit n2 &&
|
|
isOctDigit n3
|
|
fromoctal = [chr $ readoctal [n1, n2, n3]]
|
|
readoctal o = read $ "0o" ++ o :: Int
|
|
-- \C is used for a few special characters
|
|
decode (x:nc:rest)
|
|
| isescape x = ([echar nc], rest)
|
|
where
|
|
echar 'a' = '\a'
|
|
echar 'b' = '\b'
|
|
echar 'f' = '\f'
|
|
echar 'n' = '\n'
|
|
echar 'r' = '\r'
|
|
echar 't' = '\t'
|
|
echar 'v' = '\v'
|
|
echar a = a
|
|
decode n = ("", n)
|
|
|
|
{- Should not need to use this, except for testing decodeGitFile. -}
|
|
encodeGitFile :: FilePath -> String
|
|
encodeGitFile s = foldl (++) "\"" (map echar s) ++ "\""
|
|
where
|
|
e c = '\\' : [c]
|
|
echar '\a' = e 'a'
|
|
echar '\b' = e 'b'
|
|
echar '\f' = e 'f'
|
|
echar '\n' = e 'n'
|
|
echar '\r' = e 'r'
|
|
echar '\t' = e 't'
|
|
echar '\v' = e 'v'
|
|
echar '\\' = e '\\'
|
|
echar '"' = e '"'
|
|
echar x
|
|
| ord x < 0x20 = e_num x -- low ascii
|
|
| ord x >= 256 = e_utf x
|
|
| ord x > 0x7E = e_num x -- high ascii
|
|
| otherwise = [x] -- printable ascii
|
|
where
|
|
showoctal i = '\\' : printf "%03o" i
|
|
e_num c = showoctal $ ord c
|
|
-- unicode character is decomposed to
|
|
-- Word8s and each is shown in octal
|
|
e_utf c = showoctal =<< (encode [c] :: [Word8])
|
|
|
|
{- for quickcheck -}
|
|
prop_idempotent_deencode :: String -> Bool
|
|
prop_idempotent_deencode s = s == decodeGitFile (encodeGitFile s)
|
|
|
|
{- Constructs a Repo from the path specified in the git remotes of
|
|
- another Repo. -}
|
|
repoFromRemotePath :: FilePath -> Repo -> IO Repo
|
|
repoFromRemotePath dir repo = do
|
|
dir' <- expandTilde dir
|
|
repoFromAbsPath $ workTree repo </> dir'
|
|
|
|
{- Git remotes can have a directory that is specified relative
|
|
- to the user's home directory, or that contains tilde expansions.
|
|
- This converts such a directory to an absolute path.
|
|
- Note that it has to run on the system where the remote is.
|
|
-}
|
|
repoAbsPath :: FilePath -> IO FilePath
|
|
repoAbsPath d = do
|
|
d' <- expandTilde d
|
|
h <- myHomeDir
|
|
return $ h </> d'
|
|
|
|
expandTilde :: FilePath -> IO FilePath
|
|
expandTilde = expandt True
|
|
where
|
|
expandt _ [] = return ""
|
|
expandt _ ('/':cs) = do
|
|
v <- expandt True cs
|
|
return ('/':v)
|
|
expandt True ('~':'/':cs) = do
|
|
h <- myHomeDir
|
|
return $ h </> cs
|
|
expandt True ('~':cs) = do
|
|
let (name, rest) = findname "" cs
|
|
u <- getUserEntryForName name
|
|
return $ homeDirectory u </> rest
|
|
expandt _ (c:cs) = do
|
|
v <- expandt False cs
|
|
return (c:v)
|
|
findname n [] = (n, "")
|
|
findname n (c:cs)
|
|
| c == '/' = (n, cs)
|
|
| otherwise = findname (n++[c]) cs
|
|
|
|
{- Finds the current git repository, which may be in a parent directory. -}
|
|
repoFromCwd :: IO Repo
|
|
repoFromCwd = getCurrentDirectory >>= seekUp isRepoTop >>= maybe norepo makerepo
|
|
where
|
|
makerepo = return . newFrom . Dir
|
|
norepo = error "Not in a git repository."
|
|
|
|
seekUp :: (FilePath -> IO Bool) -> FilePath -> IO (Maybe FilePath)
|
|
seekUp want dir = do
|
|
ok <- want dir
|
|
if ok
|
|
then return $ Just dir
|
|
else case parentDir dir of
|
|
"" -> return Nothing
|
|
d -> seekUp want d
|
|
|
|
isRepoTop :: FilePath -> IO Bool
|
|
isRepoTop dir = do
|
|
r <- isRepo
|
|
b <- isBareRepo
|
|
return (r || b)
|
|
where
|
|
isRepo = gitSignature ".git" ".git/config"
|
|
isBareRepo = gitSignature "objects" "config"
|
|
gitSignature subdir file = liftM2 (&&)
|
|
(doesDirectoryExist (dir ++ "/" ++ subdir))
|
|
(doesFileExist (dir ++ "/" ++ file))
|