diff options
author | 2011-06-30 13:16:57 -0400 | |
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committer | 2011-06-30 13:21:39 -0400 | |
commit | f6063a094ec02caec314b42dc05f2f0595ae0ce4 (patch) | |
tree | 624717470d70b9119361803b4656dd1c79573354 /GitRepo.hs | |
parent | 5fe02f280726442496303859e83f9ce1c48be0cb (diff) |
renamed GitRepo to Git
It was always imported qualified as Git anyway
Diffstat (limited to 'GitRepo.hs')
-rw-r--r-- | GitRepo.hs | 681 |
1 files changed, 0 insertions, 681 deletions
diff --git a/GitRepo.hs b/GitRepo.hs deleted file mode 100644 index cc4636868..000000000 --- a/GitRepo.hs +++ /dev/null @@ -1,681 +0,0 @@ -{- git repository handling - - - - This is written to be completely independant of git-annex and should be - - suitable for other uses. - - - - Copyright 2010 Joey Hess <joey@kitenet.net> - - - - Licensed under the GNU GPL version 3 or higher. - -} - -module GitRepo ( - Repo, - repoFromCwd, - repoFromAbsPath, - repoFromUnknown, - repoFromUrl, - localToUrl, - repoIsUrl, - repoIsSsh, - repoIsLocalBare, - repoDescribe, - repoLocation, - workTree, - workTreeFile, - gitDir, - urlPath, - urlHost, - urlPort, - urlHostUser, - urlAuthority, - urlScheme, - configGet, - configMap, - configRead, - hConfigRead, - configStore, - configTrue, - gitCommandLine, - run, - runBool, - pipeRead, - pipeWrite, - pipeWriteRead, - pipeNullSplit, - attributes, - remotes, - remotesAdd, - repoRemoteName, - repoRemoteNameSet, - checkAttr, - decodeGitFile, - encodeGitFile, - repoAbsPath, - reap, - useIndex, - hashObject, - getSha, - shaSize, - - prop_idempotent_deencode -) where - -import Control.Monad (unless, when) -import System.Directory -import System.FilePath -import System.Posix.Directory -import System.Posix.User -import System.Posix.Process -import System.Path -import System.Cmd.Utils -import IO (bracket_) -import Data.String.Utils -import System.IO -import IO (try) -import qualified Data.Map as Map hiding (map, split) -import Network.URI -import Data.Maybe -import Data.Char -import Data.Word (Word8) -import Codec.Binary.UTF8.String (encode) -import Text.Printf -import Data.List (isInfixOf, isPrefixOf, isSuffixOf) -import System.Exit -import System.Posix.Env (setEnv, unsetEnv, getEnv) - -import Utility - -{- There are two types of repositories; those on local disk and those - - accessed via an URL. -} -data RepoLocation = Dir FilePath | Url URI | Unknown - deriving (Show, Eq) - -data Repo = Repo { - location :: RepoLocation, - config :: Map.Map String String, - remotes :: [Repo], - -- remoteName holds the name used for this repo in remotes - remoteName :: Maybe String -} deriving (Show, Eq) - -newFrom :: RepoLocation -> Repo -newFrom l = - Repo { - location = l, - config = Map.empty, - remotes = [], - remoteName = Nothing - } - -{- Local Repo constructor, requires an absolute path to the repo be - - specified. -} -repoFromAbsPath :: FilePath -> IO Repo -repoFromAbsPath dir - | "/" `isPrefixOf` dir = do - -- Git always looks for "dir.git" in preference to - -- to "dir", even if dir ends in a "/". - let canondir = dropTrailingPathSeparator dir - let dir' = canondir ++ ".git" - e <- doesDirectoryExist dir' - if e - then ret dir' - else if "/.git" `isSuffixOf` canondir - then do - -- When dir == "foo/.git", git looks - -- for "foo/.git/.git", and failing - -- that, uses "foo" as the repository. - e' <- doesDirectoryExist $ dir </> ".git" - if e' - then ret dir - else ret $ takeDirectory canondir - else ret dir - | otherwise = error $ "internal error, " ++ dir ++ " is not absolute" - where - ret = return . newFrom . Dir - -{- Remote Repo constructor. Throws exception on invalid url. -} -repoFromUrl :: String -> IO Repo -repoFromUrl url - | startswith "file://" url = repoFromAbsPath $ uriPath u - | otherwise = return $ newFrom $ Url u - where - u = maybe bad id $ parseURI url - bad = error $ "bad url " ++ url - -{- Creates a repo that has an unknown location. -} -repoFromUnknown :: Repo -repoFromUnknown = newFrom Unknown - -{- Converts a Local Repo into a remote repo, using the reference repo - - which is assumed to be on the same host. -} -localToUrl :: Repo -> Repo -> Repo -localToUrl reference r - | not $ repoIsUrl reference = error "internal error; reference repo not url" - | repoIsUrl r = r - | otherwise = r { location = Url $ fromJust $ parseURI absurl } - where - absurl = - urlScheme reference ++ "//" ++ - urlAuthority reference ++ - workTree r - -{- User-visible description of a git repo. -} -repoDescribe :: Repo -> String -repoDescribe Repo { remoteName = Just name } = name -repoDescribe Repo { location = Url url } = show url -repoDescribe Repo { location = Dir dir } = dir -repoDescribe Repo { location = Unknown } = "UNKNOWN" - -{- Location of the repo, either as a path or url. -} -repoLocation :: Repo -> String -repoLocation Repo { location = Url url } = show url -repoLocation Repo { location = Dir dir } = dir -repoLocation Repo { location = Unknown } = undefined - -{- Constructs and returns an updated version of a repo with - - different remotes list. -} -remotesAdd :: Repo -> [Repo] -> Repo -remotesAdd repo rs = repo { remotes = rs } - -{- Returns the name of the remote that corresponds to the repo, if - - it is a remote. -} -repoRemoteName :: Repo -> Maybe String -repoRemoteName Repo { remoteName = Just name } = Just name -repoRemoteName _ = Nothing - -{- Sets the name of a remote based on the git config key, such as - "remote.foo.url". -} -repoRemoteNameSet :: Repo -> String -> Repo -repoRemoteNameSet r k = r { remoteName = Just basename } - where - basename = join "." $ reverse $ drop 1 $ - reverse $ drop 1 $ split "." k - -{- Some code needs to vary between URL and normal repos, - - or bare and non-bare, these functions help with that. -} -repoIsUrl :: Repo -> Bool -repoIsUrl Repo { location = Url _ } = True -repoIsUrl _ = False - -repoIsSsh :: Repo -> Bool -repoIsSsh Repo { location = Url url } - | uriScheme url == "ssh:" = True - -- git treats these the same as ssh - | uriScheme url == "git+ssh:" = True - | uriScheme url == "ssh+git:" = True - | otherwise = False -repoIsSsh _ = False - -configAvail ::Repo -> Bool -configAvail Repo { config = c } = c /= Map.empty - -repoIsLocalBare :: Repo -> Bool -repoIsLocalBare r@(Repo { location = Dir _ }) = configAvail r && configBare r -repoIsLocalBare _ = False - -assertLocal :: Repo -> a -> a -assertLocal repo action = - if not $ repoIsUrl repo - then action - else error $ "acting on URL git repo " ++ repoDescribe repo ++ - " not supported" -assertUrl :: Repo -> a -> a -assertUrl repo action = - if repoIsUrl repo - then action - else error $ "acting on local git repo " ++ repoDescribe repo ++ - " not supported" - -configBare :: Repo -> Bool -configBare repo = maybe unknown configTrue $ Map.lookup "core.bare" $ config repo - where - unknown = error $ "it is not known if git repo " ++ - repoDescribe repo ++ - " is a bare repository; config not read" - -{- Path to a repository's gitattributes file. -} -attributes :: Repo -> String -attributes repo - | configBare repo = workTree repo ++ "/info/.gitattributes" - | otherwise = workTree repo ++ "/.gitattributes" - -{- Path to a repository's .git directory, relative to its workTree. -} -gitDir :: Repo -> String -gitDir repo - | configBare repo = "" - | otherwise = ".git" - -{- Path to a repository's --work-tree, that is, its top. - - - - Note that for URL repositories, this is the path on the remote host. -} -workTree :: Repo -> FilePath -workTree r@(Repo { location = Url _ }) = urlPath r -workTree (Repo { location = Dir d }) = d -workTree Repo { location = Unknown } = undefined - -{- Given a relative or absolute filename inside a git repository's - - workTree, calculates the name to use to refer to that file to git. - - - - This is complicated because the best choice can vary depending on - - whether the cwd is in a subdirectory of the git repository, or not. - - - - For example, when adding a file "/tmp/repo/foo", it's best to refer - - to it as "foo" if the cwd is outside the repository entirely - - (this avoids a gotcha with using the full path name when /tmp/repo - - is itself a symlink). But, if the cwd is "/tmp/repo/subdir", - - it's best to refer to "../foo". - -} -workTreeFile :: Repo -> FilePath -> IO FilePath -workTreeFile repo@(Repo { location = Dir d }) file = do - cwd <- getCurrentDirectory - let file' = absfile cwd - unless (inrepo file') $ - error $ file ++ " is not located inside git repository " ++ absrepo - if (inrepo $ addTrailingPathSeparator cwd) - then return $ relPathDirToFile cwd file' - else return $ drop (length absrepo) file' - where - -- normalize both repo and file, so that repo - -- will be substring of file - absrepo = maybe bad addTrailingPathSeparator $ absNormPath "/" d - absfile c = maybe file id $ secureAbsNormPath c file - inrepo f = absrepo `isPrefixOf` f - bad = error $ "bad repo" ++ repoDescribe repo -workTreeFile repo _ = assertLocal repo $ error "internal" - -{- Path of an URL repo. -} -urlPath :: Repo -> String -urlPath Repo { location = Url u } = uriPath u -urlPath repo = assertUrl repo $ error "internal" - -{- Scheme of an URL repo. -} -urlScheme :: Repo -> String -urlScheme Repo { location = Url u } = uriScheme u -urlScheme repo = assertUrl repo $ error "internal" - -{- Work around a bug in the real uriRegName - - <http://trac.haskell.org/network/ticket/40> -} -uriRegName' :: URIAuth -> String -uriRegName' a = fixup $ uriRegName a - where - fixup x@('[':rest) - | rest !! len == ']' = take len rest - | otherwise = x - where - len = (length rest) - 1 - fixup x = x - -{- Hostname of an URL repo. -} -urlHost :: Repo -> String -urlHost = urlAuthPart uriRegName' - -{- Port of an URL repo, if it has a nonstandard one. -} -urlPort :: Repo -> Maybe Integer -urlPort r = - case urlAuthPart uriPort r of - ":" -> Nothing - (':':p) -> Just (read p) - _ -> Nothing - -{- Hostname of an URL repo, including any username (ie, "user@host") -} -urlHostUser :: Repo -> String -urlHostUser r = urlAuthPart uriUserInfo r ++ urlAuthPart uriRegName' r - -{- The full authority portion an URL repo. (ie, "user@host:port") -} -urlAuthority :: Repo -> String -urlAuthority Repo { location = Url u } = uriUserInfo a ++ uriRegName' a ++ uriPort a - where - a = fromMaybe (error $ "bad url " ++ show u) (uriAuthority u) -urlAuthority repo = assertUrl repo $ error "internal" - -{- Applies a function to extract part of the uriAuthority of an URL repo. -} -urlAuthPart :: (URIAuth -> a) -> Repo -> a -urlAuthPart a Repo { location = Url u } = a auth - where - auth = fromMaybe (error $ "bad url " ++ show u) (uriAuthority u) -urlAuthPart _ repo = assertUrl repo $ error "internal" - -{- Constructs a git command line operating on the specified repo. -} -gitCommandLine :: Repo -> [CommandParam] -> [CommandParam] -gitCommandLine repo@(Repo { location = Dir d} ) params = - -- force use of specified repo via --git-dir and --work-tree - [ Param ("--git-dir=" ++ d ++ "/" ++ gitDir repo) - , Param ("--work-tree=" ++ d) - ] ++ params -gitCommandLine repo _ = assertLocal repo $ error "internal" - -{- Runs git in the specified repo. -} -runBool :: Repo -> String -> [CommandParam] -> IO Bool -runBool repo subcommand params = assertLocal repo $ - boolSystem "git" (gitCommandLine repo ((Param subcommand):params)) - -{- Runs git in the specified repo, throwing an error if it fails. -} -run :: Repo -> String -> [CommandParam] -> IO () -run repo subcommand params = assertLocal repo $ - runBool repo subcommand params - >>! error $ "git " ++ show params ++ " failed" - -{- Runs a git subcommand and returns its output, lazily. - - - - Note that this leaves the git process running, and so zombies will - - result unless reap is called. - -} -pipeRead :: Repo -> [CommandParam] -> IO String -pipeRead repo params = assertLocal repo $ do - (_, s) <- pipeFrom "git" $ toCommand $ gitCommandLine repo params - return s - -{- Runs a git subcommand, feeding it input. - - You should call either getProcessStatus or forceSuccess on the PipeHandle. -} -pipeWrite :: Repo -> [CommandParam] -> String -> IO PipeHandle -pipeWrite repo params s = assertLocal repo $ - pipeTo "git" (toCommand $ gitCommandLine repo params) s - -{- Runs a git subcommand, feeding it input, and returning its output. - - You should call either getProcessStatus or forceSuccess on the PipeHandle. -} -pipeWriteRead :: Repo -> [CommandParam] -> String -> IO (PipeHandle, String) -pipeWriteRead repo params s = assertLocal repo $ - pipeBoth "git" (toCommand $ gitCommandLine repo params) s - -{- Reaps any zombie git processes. -} -reap :: IO () -reap = do - -- throws an exception when there are no child processes - r <- catch (getAnyProcessStatus False True) (\_ -> return Nothing) - maybe (return ()) (const reap) r - -{- Forces git to use the specified index file. - - Returns an action that will reset back to the default - - index file. -} -useIndex :: FilePath -> IO (IO ()) -useIndex index = do - res <- try $ getEnv var - setEnv var index True - return $ reset res - where - var = "GIT_INDEX_FILE" - reset (Right (Just v)) = setEnv var v True - reset _ = unsetEnv var - -{- Injects some content into git, returning its hash. -} -hashObject :: Repo -> String -> IO String -hashObject repo content = getSha subcmd $ do - (h, s) <- pipeWriteRead repo (map Param params) content - length s `seq` do - forceSuccess h - reap -- XXX unsure why this is needed - return s - where - subcmd = "hash-object" - params = [subcmd, "-w", "--stdin"] - -{- Runs an action that causes a git subcommand to emit a sha, and strips - any trailing newline, returning the sha. -} -getSha :: String -> IO String -> IO String -getSha subcommand a = do - t <- a - let t' = if last t == '\n' - then take (length t - 1) t - else t - when (length t' /= shaSize) $ - error $ "failed to read sha from git " ++ subcommand ++ " (" ++ t' ++ ")" - return t' - -{- Size of a git sha. -} -shaSize :: Int -shaSize = 40 - -{- Reads null terminated output of a git command (as enabled by the -z - - parameter), and splits it into a list of files/lines/whatever. -} -pipeNullSplit :: Repo -> [CommandParam] -> IO [FilePath] -pipeNullSplit repo params = do - fs0 <- pipeRead repo params - return $ split0 fs0 - where - split0 s = filter (not . null) $ split "\0" s - -{- Runs git config and populates a repo with its config. -} -configRead :: Repo -> IO Repo -configRead repo@(Repo { location = Dir d }) = do - {- Cannot use pipeRead because it relies on the config having - been already read. Instead, chdir to the repo. -} - cwd <- getCurrentDirectory - bracket_ (changeWorkingDirectory d) - (\_ -> changeWorkingDirectory cwd) $ - pOpen ReadFromPipe "git" ["config", "--list"] $ - hConfigRead repo -configRead r = assertLocal r $ error "internal" - -{- Reads git config from a handle and populates a repo with it. -} -hConfigRead :: Repo -> Handle -> IO Repo -hConfigRead repo h = do - val <- hGetContentsStrict h - configStore repo val - -{- Parses a git config and returns a version of the repo using it. -} -configStore :: Repo -> String -> IO Repo -configStore repo s = do - rs <- configRemotes r - return $ r { remotes = rs } - where - r = repo { config = configParse s } - -{- Calculates a list of a repo's configured remotes, by parsing its config. -} -configRemotes :: Repo -> IO [Repo] -configRemotes repo = mapM construct remotepairs - where - remotepairs = Map.toList $ filterremotes $ config repo - filterremotes = Map.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 = bits !! 0 - dir = join ":" $ drop 1 bits - slash d | d == "" = "/~/" ++ dir - | d !! 0 == '/' = dir - | d !! 0 == '~' = '/':dir - | otherwise = "/~/" ++ dir - -{- Checks if a string from git config is a true value. -} -configTrue :: String -> Bool -configTrue s = map toLower s == "true" - -{- Parses git config --list output into a config map. -} -configParse :: String -> Map.Map String String -configParse s = Map.fromList $ map pair $ lines s - where - pair l = (key l, val l) - key l = head $ keyval l - val l = join sep $ drop 1 $ keyval l - keyval l = split sep l :: [String] - sep = "=" - -{- Returns a single git config setting, or a default value if not set. -} -configGet :: Repo -> String -> String -> String -configGet repo key defaultValue = - Map.findWithDefault defaultValue key (config repo) - -{- Access to raw config Map -} -configMap :: Repo -> Map.Map String String -configMap repo = config repo - -{- 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 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++"/") $ lines s - where - params = gitCommandLine repo [Param "check-attr", Param attr, Params "-z --stdin"] - topair cwd l = (relfile, value) - where - relfile - | startswith cwd file = drop (length cwd) file - | otherwise = file - file = decodeGitFile $ join sep $ take end bits - value = bits !! end - end = length bits - 1 - bits = split sep l - sep = ": " ++ attr ++ ": " - -{- 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 = take (length s - 1) 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 = do - s <- (doesDirectoryExist (dir ++ "/" ++ subdir)) - f <- (doesFileExist (dir ++ "/" ++ file)) - return (s && f) |