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|
{- git-annex command
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Vicfg where
import qualified Data.Map as M
import qualified Data.Set as S
import System.Environment (getEnv)
import Data.Tuple (swap)
import Data.Char (isSpace)
import Common.Annex
import Command
import Annex.Perms
import Types.TrustLevel
import Types.Group
import Logs.Trust
import Logs.Group
import Logs.PreferredContent
import Remote
def :: [Command]
def = [command "vicfg" paramNothing seek
"edit git-annex's configuration"]
seek :: [CommandSeek]
seek = [withNothing start]
start :: CommandStart
start = do
f <- fromRepo gitAnnexTmpCfgFile
createAnnexDirectory $ parentDir f
cfg <- getCfg
descs <- uuidDescriptions
liftIO $ writeFile f $ genCfg cfg descs
vicfg cfg f
stop
vicfg :: Cfg -> FilePath -> Annex ()
vicfg curcfg f = do
vi <- liftIO $ catchDefaultIO "vi" $ getEnv "EDITOR"
-- Allow EDITOR to be processed by the shell, so it can contain options.
unlessM (liftIO $ boolSystem "sh" [Param "-c", Param $ unwords [vi, shellEscape f]]) $
error $ vi ++ " exited nonzero; aborting"
r <- parseCfg curcfg <$> liftIO (readFileStrict f)
liftIO $ nukeFile f
case r of
Left s -> do
liftIO $ writeFile f s
vicfg curcfg f
Right newcfg -> setCfg curcfg newcfg
data Cfg = Cfg
{ cfgTrustMap :: TrustMap
, cfgGroupMap :: M.Map UUID (S.Set Group)
, cfgPreferredContentMap :: M.Map UUID String
}
getCfg :: Annex Cfg
getCfg = Cfg
<$> trustMapRaw -- without local trust overrides
<*> (groupsByUUID <$> groupMap)
<*> preferredContentMapRaw
setCfg :: Cfg -> Cfg -> Annex ()
setCfg curcfg newcfg = do
let (trustchanges, groupchanges, preferredcontentchanges) = diffCfg curcfg newcfg
mapM_ (uncurry trustSet) $ M.toList trustchanges
mapM_ (uncurry groupSet) $ M.toList groupchanges
mapM_ (uncurry preferredContentSet) $ M.toList preferredcontentchanges
diffCfg :: Cfg -> Cfg -> (TrustMap, M.Map UUID (S.Set Group), M.Map UUID String)
diffCfg curcfg newcfg = (diff cfgTrustMap, diff cfgGroupMap, diff cfgPreferredContentMap)
where
diff f = M.differenceWith (\x y -> if x == y then Nothing else Just x)
(f newcfg) (f curcfg)
genCfg :: Cfg -> M.Map UUID String -> String
genCfg cfg descs = unlines $ concat [intro, trust, groups, preferredcontent]
where
intro =
[ com "git-annex configuration"
, com ""
, com "Changes saved to this file will be recorded in the git-annex branch."
, com ""
, com "Lines in this file have the format:"
, com " setting uuid = value"
]
trust = settings cfgTrustMap
[ ""
, com "Repository trust configuration"
, com "(Valid trust levels: " ++
unwords (map showTrustLevel [Trusted .. DeadTrusted]) ++
")"
]
(\(t, u) -> line "trust" u $ showTrustLevel t)
(\u -> lcom $ line "trust" u $ showTrustLevel SemiTrusted)
groups = settings cfgGroupMap
[ ""
, com "Repository groups"
, com "(Separate group names with spaces)"
]
(\(s, u) -> line "group" u $ unwords $ S.toList s)
(\u -> lcom $ line "group" u "")
preferredcontent = settings cfgPreferredContentMap
[ ""
, com "Repository preferred contents"
]
(\(s, u) -> line "preferred-content" u s)
(\u -> line "preferred-content" u "")
settings field desc showvals showdefaults = concat
[ desc
, concatMap showvals $ sort $ map swap $ M.toList $ field cfg
, concatMap (\u -> lcom $ showdefaults u) $ missing field
]
line setting u value =
[ com $ "(for " ++ (fromMaybe "" $ M.lookup u descs) ++ ")"
, unwords [setting, fromUUID u, "=", value]
]
lcom = map (\l -> if "#" `isPrefixOf` l then l else "#" ++ l)
missing field = S.toList $ M.keysSet descs `S.difference` M.keysSet (field cfg)
{- If there's a parse error, returns a new version of the file,
- with the problem lines noted. -}
parseCfg :: Cfg -> String -> Either String Cfg
parseCfg curcfg = go [] curcfg . lines
where
go c cfg []
| null (catMaybes $ map fst c) = Right cfg
| otherwise = Left $ unlines $
badheader ++ concatMap showerr (reverse c)
go c cfg (l:ls) = case parse (dropWhile isSpace l) cfg of
Left msg -> go ((Just msg, l):c) cfg ls
Right cfg' -> go ((Nothing, l):c) cfg' ls
parse l cfg
| null l = Right cfg
| "#" `isPrefixOf` l = Right cfg
| null setting || null u = Left "missing repository uuid"
| otherwise = handle cfg (toUUID u) setting value'
where
(setting, rest) = separate isSpace l
(r, value) = separate (== '=') rest
value' = trimspace value
u = reverse $ trimspace $ reverse $ trimspace r
trimspace = dropWhile isSpace
handle cfg u setting value
| setting == "trust" = case readTrustLevel value of
Nothing -> badval "trust value" value
Just t ->
let m = M.insert u t (cfgTrustMap cfg)
in Right $ cfg { cfgTrustMap = m }
| setting == "group" =
let m = M.insert u (S.fromList $ words value) (cfgGroupMap cfg)
in Right $ cfg { cfgGroupMap = m }
| setting == "preferred-content" =
case checkPreferredContentExpression value of
Just e -> Left e
Nothing ->
let m = M.insert u value (cfgPreferredContentMap cfg)
in Right $ cfg { cfgPreferredContentMap = m }
| otherwise = badval "setting" setting
showerr (Just msg, l) = [parseerr ++ msg, l]
showerr (Nothing, l)
-- filter out the header and parse error lines
-- from any previous parse failure
| any (`isPrefixOf` l) (parseerr:badheader) = []
| otherwise = [l]
badval desc val = Left $ "unknown " ++ desc ++ " \"" ++ val ++ "\""
badheader =
[ com "There was a problem parsing your input."
, com "Search for \"Parse error\" to find the bad lines."
, com "Either fix the bad lines, or delete them (to discard your changes)."
]
parseerr = com "Parse error in next line: "
com :: String -> String
com s = "# " ++ s
|
