328 lines
10 KiB
Haskell
328 lines
10 KiB
Haskell
{- git repository configuration handling
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-
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- Copyright 2010-2022 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE OverloadedStrings #-}
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module Git.Config where
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import qualified Data.Map as M
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import qualified Data.ByteString as S
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import qualified Data.ByteString.Char8 as S8
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import Data.Char
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import qualified System.FilePath.ByteString as P
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import Control.Concurrent.Async
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import Common
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import Git
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import Git.Types
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import qualified Git.Command
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import qualified Git.Construct
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import Utility.UserInfo
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import Utility.Process.Transcript
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import Utility.Debug
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{- Returns a single git config setting, or a fallback value if not set. -}
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get :: ConfigKey -> ConfigValue -> Repo -> ConfigValue
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get key fallback repo = M.findWithDefault fallback key (config repo)
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{- Returns a list of values. -}
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getList :: ConfigKey -> Repo -> [ConfigValue]
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getList key repo = M.findWithDefault [] key (fullconfig repo)
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{- Returns a single git config setting, if set. -}
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getMaybe :: ConfigKey -> Repo -> Maybe ConfigValue
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getMaybe key repo = M.lookup key (config repo)
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{- Runs git config and populates a repo with its config.
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- Avoids re-reading config when run repeatedly. -}
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read :: Repo -> IO Repo
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read repo@(Repo { config = c })
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| c == M.empty = read' repo
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| otherwise = return repo
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{- Reads config even if it was read before. -}
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reRead :: Repo -> IO Repo
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reRead r = read' $ r
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{ config = M.empty
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, fullconfig = M.empty
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}
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{- Cannot use pipeRead because it relies on the config having been already
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- read. Instead, chdir to the repo and run git config.
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-}
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read' :: Repo -> IO Repo
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read' repo = go repo
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where
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go Repo { location = Local { gitdir = d } } = git_config True d
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go Repo { location = LocalUnknown d } = git_config False d
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go _ = assertLocal repo $ error "internal"
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git_config isgitdir d = withCreateProcess p (git_config' p)
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where
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params =
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-- Passing --git-dir changes git's behavior
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-- when run in a repository belonging to another
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-- user. When a gitdir is known, pass that in order
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-- to get the local git config.
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(if isgitdir && gitDirSpecifiedExplicitly repo
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then ["--git-dir=."]
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else [])
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++ ["config", "--null", "--list"]
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p = (proc "git" params)
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{ cwd = Just (fromRawFilePath d)
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, env = gitEnv repo
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, std_out = CreatePipe
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}
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git_config' p _ (Just hout) _ pid =
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forceSuccessProcess p pid
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`after`
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hRead repo ConfigNullList hout
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git_config' _ _ _ _ _ = error "internal"
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{- Gets the global git config, returning a dummy Repo containing it. -}
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global :: IO (Maybe Repo)
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global = do
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home <- myHomeDir
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ifM (doesFileExist $ home </> ".gitconfig")
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( Just <$> withCreateProcess p go
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, return Nothing
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)
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where
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params = ["config", "--null", "--list", "--global"]
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p = (proc "git" params)
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{ std_out = CreatePipe }
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go _ (Just hout) _ pid =
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forceSuccessProcess p pid
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`after`
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hRead (Git.Construct.fromUnknown) ConfigNullList hout
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go _ _ _ _ = error "internal"
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{- Reads git config from a handle and populates a repo with it. -}
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hRead :: Repo -> ConfigStyle -> Handle -> IO Repo
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hRead repo st h = do
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val <- S.hGetContents h
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let c = parse val st
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debug (DebugSource "Git.Config") $ "git config read: " ++
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show (map (\(k, v) -> (show k, map show v)) (M.toList c))
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storeParsed c repo
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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.
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- Config settings can be updated incrementally.
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-}
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store :: S.ByteString -> ConfigStyle -> Repo -> IO Repo
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store s st = storeParsed (parse s st)
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storeParsed :: M.Map ConfigKey [ConfigValue] -> Repo -> IO Repo
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storeParsed c repo = updateLocation $ repo
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{ config = (M.map Prelude.head c) `M.union` config repo
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, fullconfig = M.unionWith (++) c (fullconfig repo)
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}
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{- Stores a single config setting in a Repo, returning the new version of
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- the Repo. Config settings can be updated incrementally. -}
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store' :: ConfigKey -> ConfigValue -> Repo -> Repo
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store' k v repo = repo
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{ config = M.singleton k v `M.union` config repo
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, fullconfig = M.unionWith (++) (M.singleton k [v]) (fullconfig repo)
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}
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{- Updates the location of a repo, based on its configuration.
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-
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- Git.Construct makes LocalUknown repos, of which only a directory is
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- known. Once the config is read, this can be fixed up to a Local repo,
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- based on the core.bare and core.worktree settings.
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-}
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updateLocation :: Repo -> IO Repo
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updateLocation r@(Repo { location = LocalUnknown d }) = case isBare r of
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Just True -> ifM (doesDirectoryExist (fromRawFilePath dotgit))
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( updateLocation' r $ Local dotgit Nothing
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, updateLocation' r $ Local d Nothing
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)
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Just False -> mknonbare
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{- core.bare not in config, probably because safe.directory
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- did not allow reading the config -}
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Nothing -> ifM (Git.Construct.isBareRepo (fromRawFilePath d))
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( mkbare
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, mknonbare
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)
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where
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dotgit = d P.</> ".git"
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-- git treats eg ~/foo as a bare git repository located in
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-- ~/foo/.git if ~/foo/.git/config has core.bare=true
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mkbare = ifM (doesDirectoryExist (fromRawFilePath dotgit))
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( updateLocation' r $ Local dotgit Nothing
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, updateLocation' r $ Local d Nothing
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)
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mknonbare = updateLocation' r $ Local dotgit (Just d)
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updateLocation r@(Repo { location = l@(Local {}) }) = updateLocation' r l
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updateLocation r = return r
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updateLocation' :: Repo -> RepoLocation -> IO Repo
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updateLocation' r l = do
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l' <- case getMaybe "core.worktree" r of
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Nothing -> return l
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Just (ConfigValue d) -> do
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{- core.worktree is relative to the gitdir -}
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top <- absPath (gitdir l)
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let p = absPathFrom top d
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return $ l { worktree = Just p }
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Just NoConfigValue -> return l
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return $ r { location = l' }
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data ConfigStyle = ConfigList | ConfigNullList
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{- Parses git config --list or git config --null --list output into a
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- config map. -}
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parse :: S.ByteString -> ConfigStyle -> M.Map ConfigKey [ConfigValue]
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parse s st
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| S.null s = M.empty
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| otherwise = case st of
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ConfigList -> sep eq $ S.split nl s
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ConfigNullList -> sep nl $ S.split 0 s
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where
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nl = fromIntegral (ord '\n')
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eq = fromIntegral (ord '=')
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sep c = M.fromListWith (++)
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. map (\(k,v) -> (ConfigKey k, [mkval v]))
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. map (S.break (== c))
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mkval v
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| S.null v = NoConfigValue
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| otherwise = ConfigValue (S.drop 1 v)
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{- Checks if a string from git config is a true/false value. -}
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isTrueFalse :: String -> Maybe Bool
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isTrueFalse = isTrueFalse' . ConfigValue . encodeBS
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isTrueFalse' :: ConfigValue -> Maybe Bool
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isTrueFalse' (ConfigValue s)
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| s' == "yes" = Just True
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| s' == "on" = Just True
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| s' == "true" = Just True
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| s' == "1" = Just True
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| s' == "no" = Just False
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| s' == "off" = Just False
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| s' == "false" = Just False
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| s' == "0" = Just False
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| s' == "" = Just False
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-- Git treats any number other than 0 as true,
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-- including negative numbers.
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| S8.all (\c -> isDigit c || c == '-') s' = Just True
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| otherwise = Nothing
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where
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s' = S8.map toLower s
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isTrueFalse' NoConfigValue = Just True
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boolConfig :: Bool -> String
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boolConfig True = "true"
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boolConfig False = "false"
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boolConfig' :: Bool -> S.ByteString
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boolConfig' True = "true"
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boolConfig' False = "false"
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{- Note that repoIsLocalBare is often better to use than this. -}
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isBare :: Repo -> Maybe Bool
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isBare r = isTrueFalse' =<< getMaybe coreBare r
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coreBare :: ConfigKey
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coreBare = "core.bare"
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{- Runs a command to get the configuration of a repo,
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- and returns a repo populated with the configuration, as well as the raw
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- output and the standard error of the command. -}
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fromPipe :: Repo -> String -> [CommandParam] -> ConfigStyle -> IO (Either SomeException (Repo, S.ByteString, String))
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fromPipe r cmd params st = tryNonAsync $ withCreateProcess p go
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where
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p = (proc cmd $ toCommand params)
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{ std_out = CreatePipe
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, std_err = CreatePipe
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}
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go _ (Just hout) (Just herr) pid =
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withAsync (getstderr pid herr []) $ \errreader -> do
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val <- S.hGetContents hout
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err <- wait errreader
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forceSuccessProcess p pid
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r' <- store val st r
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return (r', val, err)
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go _ _ _ _ = error "internal"
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getstderr pid herr c = hGetLineUntilExitOrEOF pid herr >>= \case
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Just l -> getstderr pid herr (l:c)
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Nothing -> return (unlines (reverse c))
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{- Reads git config from a specified file and returns the repo populated
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- with the configuration. -}
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fromFile :: Repo -> FilePath -> IO (Either SomeException (Repo, S.ByteString, String))
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fromFile r f = fromPipe r "git"
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[ Param "config"
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, Param "--file"
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, File f
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, Param "--list"
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] ConfigList
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{- Changes a git config setting in .git/config. -}
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change :: ConfigKey -> S.ByteString -> Repo -> IO Bool
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change (ConfigKey k) v = Git.Command.runBool
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[ Param "config"
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, Param (decodeBS k)
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, Param (decodeBS v)
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]
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{- Changes a git config setting in the specified config file.
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- (Creates the file if it does not already exist.) -}
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changeFile :: FilePath -> ConfigKey -> S.ByteString -> IO Bool
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changeFile f (ConfigKey k) v = boolSystem "git"
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[ Param "config"
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, Param "--file"
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, File f
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, Param (decodeBS k)
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, Param (decodeBS v)
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]
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{- Unsets a git config setting, in both the git repo,
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- and the cached config in the Repo.
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-
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- If unsetting the config fails, including in a read-only repo, or
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- when the config is not set, returns Nothing.
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-}
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unset :: ConfigKey -> Repo -> IO (Maybe Repo)
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unset ck@(ConfigKey k) r = ifM (Git.Command.runBool ps r)
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( return $ Just $ r { config = M.delete ck (config r) }
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, return Nothing
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)
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where
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ps = [Param "config", Param "--unset-all", Param (decodeBS k)]
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{- git "fixed" CVE-2022-24765 by preventing git-config from
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- listing per-repo configs when the repo is not owned by
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- the current user. Detect if this fix is in effect for the
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- repo.
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-}
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checkRepoConfigInaccessible :: Repo -> IO Bool
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checkRepoConfigInaccessible r
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-- When --git-dir or GIT_DIR is used to specify the git
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-- directory, git does not check for CVE-2022-24765.
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| gitDirSpecifiedExplicitly r = return False
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| otherwise = do
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-- Cannot use gitCommandLine here because specifying --git-dir
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-- will bypass the git security check.
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let p = (proc "git" ["config", "--local", "--list"])
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{ cwd = Just (fromRawFilePath (repoPath r))
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, env = gitEnv r
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}
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(out, ok) <- processTranscript' p Nothing
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if not ok
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then do
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debug (DebugSource "Git.Config") ("config output: " ++ out)
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return True
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else return False
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