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|
{- git-annex-shell main program
-
- Copyright 2010-2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module GitAnnexShell where
import System.Posix.Env
import System.Console.GetOpt
import Common.Annex
import qualified Git.Construct
import CmdLine
import Command
import Annex.UUID
import Annex (setField)
import qualified Option
import Fields
import Utility.UserInfo
import qualified Command.ConfigList
import qualified Command.InAnnex
import qualified Command.DropKey
import qualified Command.RecvKey
import qualified Command.SendKey
import qualified Command.TransferInfo
import qualified Command.Commit
cmds_readonly :: [Command]
cmds_readonly = concat
[ Command.ConfigList.def
, Command.InAnnex.def
, Command.SendKey.def
, Command.TransferInfo.def
]
cmds_notreadonly :: [Command]
cmds_notreadonly = concat
[ Command.RecvKey.def
, Command.DropKey.def
, Command.Commit.def
]
cmds :: [Command]
cmds = map adddirparam $ cmds_readonly ++ cmds_notreadonly
where
adddirparam c = c { cmdparamdesc = "DIRECTORY " ++ cmdparamdesc c }
options :: [OptDescr (Annex ())]
options = Option.common ++
[ Option [] ["uuid"] (ReqArg checkuuid paramUUID) "local repository uuid"
]
where
checkuuid expected = getUUID >>= check
where
check u | u == toUUID expected = noop
check NoUUID = unexpected "uninitialized repository"
check u = unexpected $ "UUID " ++ fromUUID u
unexpected s = error $
"expected repository UUID " ++
expected ++ " but found " ++ s
header :: String
header = "git-annex-shell [-c] command [parameters ...] [option ...]"
run :: [String] -> IO ()
run [] = failure
-- skip leading -c options, passed by eg, ssh
run ("-c":p) = run p
-- a command can be either a builtin or something to pass to git-shell
run c@(cmd:dir:params)
| cmd `elem` builtins = builtin cmd dir params
| otherwise = external c
run c@(cmd:_)
-- Handle the case of being the user's login shell. It will be passed
-- a single string containing all the real parameters.
| "git-annex-shell " `isPrefixOf` cmd = run $ drop 1 $ shellUnEscape cmd
| cmd `elem` builtins = failure
| otherwise = external c
builtins :: [String]
builtins = map cmdname cmds
builtin :: String -> String -> [String] -> IO ()
builtin cmd dir params = do
checkNotReadOnly cmd
checkDirectory $ Just dir
let (params', fieldparams, opts) = partitionParams params
fields = filter checkField $ parseFields fieldparams
cmds' = map (newcmd $ unwords opts) cmds
dispatch False (cmd : params') cmds' options fields header $
Git.Construct.repoAbsPath dir >>= Git.Construct.fromAbsPath
where
addrsyncopts opts seek k = setField "RsyncOptions" opts >> seek k
newcmd opts c = c { cmdseek = map (addrsyncopts opts) (cmdseek c) }
external :: [String] -> IO ()
external params = do
{- Normal git-shell commands all have the directory as their last
- parameter. -}
let lastparam = lastMaybe =<< shellUnEscape <$> lastMaybe params
(params', _, _) = partitionParams params
checkDirectory lastparam
checkNotLimited
unlessM (boolSystem "git-shell" $ map Param $ "-c":params') $
error "git-shell failed"
{- Split the input list into 3 groups separated with a double dash --.
- Parameters between two -- markers are field settings, in the form:
- field=value field=value
-
- Parameters after the last -- are the command itself and its arguments e.g.,
- rsync --bandwidth=100.
-}
partitionParams :: [String] -> ([String], [String], [String])
partitionParams ps = case segment (== "--") ps of
params:fieldparams:rest -> ( params, fieldparams, intercalate ["--"] rest )
[params] -> (params, [], [])
_ -> ([], [], [])
parseFields :: [String] -> [(String, String)]
parseFields = map (separate (== '='))
{- Only allow known fields to be set, ignore others.
- Make sure that field values make sense. -}
checkField :: (String, String) -> Bool
checkField (field, value)
| field == fieldName remoteUUID = fieldCheck remoteUUID value
| field == fieldName associatedFile = fieldCheck associatedFile value
| field == fieldName direct = fieldCheck direct value
| otherwise = False
failure :: IO ()
failure = error $ "bad parameters\n\n" ++ usage header cmds
checkNotLimited :: IO ()
checkNotLimited = checkEnv "GIT_ANNEX_SHELL_LIMITED"
checkNotReadOnly :: String -> IO ()
checkNotReadOnly cmd
| cmd `elem` map cmdname cmds_readonly = noop
| otherwise = checkEnv "GIT_ANNEX_SHELL_READONLY"
checkDirectory :: Maybe FilePath -> IO ()
checkDirectory mdir = do
v <- getEnv "GIT_ANNEX_SHELL_DIRECTORY"
case (v, mdir) of
(Nothing, _) -> noop
(Just d, Nothing) -> req d Nothing
(Just d, Just dir)
| d `equalFilePath` dir -> noop
| otherwise -> do
home <- myHomeDir
d' <- canondir home d
dir' <- canondir home dir
if d' `equalFilePath` dir'
then noop
else req d' (Just dir')
where
req d mdir' = error $ unwords
[ "Only allowed to access"
, d
, maybe "and could not determine directory from command line" ("not " ++) mdir'
]
{- A directory may start with ~/ or in some cases, even /~/,
- or could just be relative to home, or of course could
- be absolute. -}
canondir home d
| "~/" `isPrefixOf` d = return d
| "/~/" `isPrefixOf` d = return $ drop 1 d
| otherwise = relHome $ absPathFrom home d
checkEnv :: String -> IO ()
checkEnv var = do
v <- getEnv var
case v of
Nothing -> noop
Just "" -> noop
Just _ -> error $ "Action blocked by " ++ var
|
