root / htools / Ganeti / Runtime.hs @ 7946c25d
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{-| Implementation of the runtime configuration details. |
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-} |
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{- |
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Copyright (C) 2011, 2012 Google Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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-} |
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module Ganeti.Runtime |
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( GanetiDaemon(..) |
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, MiscGroup(..) |
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, GanetiGroup(..) |
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, RuntimeEnts |
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, daemonName |
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, daemonUser |
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, daemonGroup |
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, daemonLogFile |
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, daemonPidFile |
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, getEnts |
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, verifyDaemonUser |
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) where |
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import Control.Exception |
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import Control.Monad |
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import qualified Data.Map as M |
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import System.Exit |
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import System.FilePath |
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import System.IO |
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import System.IO.Error |
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import System.Posix.Types |
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import System.Posix.User |
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import Text.Printf |
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import qualified Ganeti.Constants as C |
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import Ganeti.BasicTypes |
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data GanetiDaemon = GanetiMasterd |
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| GanetiNoded |
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| GanetiRapi |
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| GanetiConfd |
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deriving (Show, Enum, Bounded, Eq, Ord) |
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data MiscGroup = DaemonsGroup |
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| AdminGroup |
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deriving (Show, Enum, Bounded, Eq, Ord) |
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data GanetiGroup = DaemonGroup GanetiDaemon |
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| ExtraGroup MiscGroup |
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deriving (Show, Eq, Ord) |
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type RuntimeEnts = (M.Map GanetiDaemon UserID, M.Map GanetiGroup GroupID) |
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-- | Returns the daemon name for a given daemon. |
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daemonName :: GanetiDaemon -> String |
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daemonName GanetiMasterd = C.masterd |
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daemonName GanetiNoded = C.noded |
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daemonName GanetiRapi = C.rapi |
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daemonName GanetiConfd = C.confd |
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-- | Returns the configured user name for a daemon. |
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daemonUser :: GanetiDaemon -> String |
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daemonUser GanetiMasterd = C.masterdUser |
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daemonUser GanetiNoded = C.nodedUser |
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daemonUser GanetiRapi = C.rapiUser |
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daemonUser GanetiConfd = C.confdUser |
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-- | Returns the configured group for a daemon. |
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daemonGroup :: GanetiGroup -> String |
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daemonGroup (DaemonGroup GanetiMasterd) = C.masterdGroup |
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daemonGroup (DaemonGroup GanetiNoded) = C.nodedGroup |
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daemonGroup (DaemonGroup GanetiRapi) = C.rapiGroup |
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daemonGroup (DaemonGroup GanetiConfd) = C.confdGroup |
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daemonGroup (ExtraGroup DaemonsGroup) = C.daemonsGroup |
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daemonGroup (ExtraGroup AdminGroup) = C.adminGroup |
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-- | Returns the log file for a daemon. |
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daemonLogFile :: GanetiDaemon -> FilePath |
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daemonLogFile GanetiConfd = C.daemonsLogfilesGanetiConfd |
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daemonLogFile _ = error "Unimplemented" |
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-- | Returns the pid file name for a daemon. |
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daemonPidFile :: GanetiDaemon -> FilePath |
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daemonPidFile daemon = C.runGanetiDir </> daemonName daemon <.> "pid" |
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-- | All groups list. A bit hacking, as we can't enforce it's complete |
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-- at compile time. |
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allGroups :: [GanetiGroup] |
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allGroups = map DaemonGroup [minBound..maxBound] ++ |
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map ExtraGroup [minBound..maxBound] |
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ignoreDoesNotExistErrors :: IO a -> IO (Result a) |
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ignoreDoesNotExistErrors value = do |
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result <- tryJust (\e -> if isDoesNotExistError e |
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then Just (show e) |
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else Nothing) value |
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return $ eitherToResult result |
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-- | Computes the group/user maps. |
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getEnts :: IO (Result RuntimeEnts) |
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getEnts = do |
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users <- mapM (\daemon -> do |
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entry <- ignoreDoesNotExistErrors . |
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getUserEntryForName . |
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daemonUser $ daemon |
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return (entry >>= \e -> return (daemon, userID e)) |
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) [minBound..maxBound] |
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groups <- mapM (\group -> do |
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entry <- ignoreDoesNotExistErrors . |
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getGroupEntryForName . |
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daemonGroup $ group |
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return (entry >>= \e -> return (group, groupID e)) |
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) allGroups |
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return $ do -- 'Result' monad |
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users' <- sequence users |
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groups' <- sequence groups |
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let usermap = M.fromList users' |
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groupmap = M.fromList groups' |
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return (usermap, groupmap) |
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-- | Checks whether a daemon runs as the right user. |
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verifyDaemonUser :: GanetiDaemon -> RuntimeEnts -> IO () |
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verifyDaemonUser daemon ents = do |
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myuid <- getEffectiveUserID |
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-- note: we use directly ! as lookup failues shouldn't happen, due |
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-- to the above map construction |
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checkUidMatch (daemonName daemon) ((M.!) (fst ents) daemon) myuid |
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-- | Check that two UIDs are matching or otherwise exit. |
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checkUidMatch :: String -> UserID -> UserID -> IO () |
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checkUidMatch name expected actual = |
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when (expected /= actual) $ do |
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hPrintf stderr "%s started using wrong user ID (%d), \ |
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\expected %d\n" name |
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(fromIntegral actual::Int) |
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(fromIntegral expected::Int) :: IO () |
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exitWith $ ExitFailure C.exitFailure |