module Propellor.CmdLine ( defaultMain, processCmdLine, ) where import System.Environment (getArgs) import Data.List import System.Exit import System.PosixCompat import Network.Socket import Propellor.Base import Propellor.Gpg import Propellor.Git import Propellor.Git.VerifiedBranch import Propellor.Bootstrap import Propellor.Spin import Propellor.Types.CmdLine import qualified Propellor.Property.Docker as Docker import qualified Propellor.Property.Chroot as Chroot import qualified Propellor.Shim as Shim usage :: Handle -> IO () usage h = hPutStrLn h $ unlines [ "Usage:" , " propellor" , " propellor hostname" , " propellor --spin targethost [--via relayhost]" , " propellor --add-key keyid" , " propellor --rm-key keyid" , " propellor --list-fields" , " propellor --dump field context" , " propellor --edit field context" , " propellor --set field context" , " propellor --unset field context" , " propellor --unset-unused" , " propellor --merge" , " propellor --build" , " propellor --check" ] usageError :: [String] -> IO a usageError ps = do usage stderr error ("(Unexpected: " ++ show ps) processCmdLine :: IO CmdLine processCmdLine = go =<< getArgs where go ("--check":_) = return Check go ("--spin":ps) = case reverse ps of (r:"--via":hs) -> Spin <$> mapM hostname (reverse hs) <*> pure (Just r) _ -> Spin <$> mapM hostname ps <*> pure Nothing go ("--add-key":k:[]) = return $ AddKey k go ("--rm-key":k:[]) = return $ RmKey k go ("--set":f:c:[]) = withprivfield f c Set go ("--unset":f:c:[]) = withprivfield f c Unset go ("--unset-unused":[]) = return UnsetUnused go ("--dump":f:c:[]) = withprivfield f c Dump go ("--edit":f:c:[]) = withprivfield f c Edit go ("--list-fields":[]) = return ListFields go ("--merge":[]) = return Merge go ("--help":_) = do usage stdout exitFailure go ("--boot":_:[]) = return $ Update Nothing -- for back-compat go ("--serialized":s:[]) = serialized Serialized s go ("--continue":s:[]) = serialized Continue s go ("--gitpush":fin:fout:_) = return $ GitPush (Prelude.read fin) (Prelude.read fout) go ("--run":h:[]) = go [h] go (h:[]) | "--" `isPrefixOf` h = usageError [h] | otherwise = Run <$> hostname h go [] = do s <- takeWhile (/= '\n') <$> readProcess "hostname" ["-f"] if null s then errorMessage "Cannot determine hostname! Pass it on the command line." else return $ Run s go v = usageError v withprivfield s c f = case readish s of Just pf -> return $ f pf (Context c) Nothing -> errorMessage $ "Unknown privdata field " ++ s serialized mk s = case readish s of Just cmdline -> return $ mk cmdline Nothing -> errorMessage $ "serialization failure (" ++ s ++ ")" data CanRebuild = CanRebuild | NoRebuild -- | Runs propellor on hosts, as controlled by command-line options. defaultMain :: [Host] -> IO () defaultMain hostlist = withConcurrentOutput $ do Shim.cleanEnv checkDebugMode cmdline <- processCmdLine debug ["command line: ", show cmdline] go CanRebuild cmdline where go cr (Serialized cmdline) = go cr cmdline go _ Check = return () go _ (Set field context) = setPrivData field context go _ (Unset field context) = unsetPrivData field context go _ (UnsetUnused) = unsetPrivDataUnused hostlist go _ (Dump field context) = dumpPrivData field context go _ (Edit field context) = editPrivData field context go _ ListFields = listPrivDataFields hostlist go _ (AddKey keyid) = addKey keyid go _ (RmKey keyid) = rmKey keyid go _ c@(ChrootChain _ _ _ _) = Chroot.chain hostlist c go _ (DockerChain hn cid) = Docker.chain hostlist hn cid go _ (DockerInit hn) = Docker.init hn go _ (GitPush fin fout) = gitPushHelper fin fout go cr (Relay h) = forceConsole >> updateFirst cr (Update (Just h)) (update (Just h)) go _ (Update Nothing) = forceConsole >> fetchFirst (onlyprocess (update Nothing)) go _ (Update (Just h)) = update (Just h) go _ Merge = mergeSpin go cr cmdline@(Spin hs mrelay) = buildFirst cr cmdline $ do unless (isJust mrelay) commitSpin forM_ hs $ \hn -> withhost hn $ spin mrelay hn go cr cmdline@(Run hn) = ifM ((==) 0 <$> getRealUserID) ( updateFirst cr cmdline $ runhost hn , fetchFirst $ go cr (Spin [hn] Nothing) ) go cr cmdline@(SimpleRun hn) = forceConsole >> fetchFirst (buildFirst cr cmdline (runhost hn)) -- When continuing after a rebuild, don't want to rebuild again. go _ (Continue cmdline) = go NoRebuild cmdline withhost :: HostName -> (Host -> IO ()) -> IO () withhost hn a = maybe (unknownhost hn hostlist) a (findHost hostlist hn) runhost hn = onlyprocess $ withhost hn mainProperties onlyprocess = onlyProcess (localdir ".lock") unknownhost :: HostName -> [Host] -> IO a unknownhost h hosts = errorMessage $ unlines [ "Propellor does not know about host: " ++ h , "(Perhaps you should specify the real hostname on the command line?)" , "(Or, edit propellor's config.hs to configure this host)" , "Known hosts: " ++ unwords (map hostName hosts) ] -- Builds propellor (when allowed) and if it looks like a new binary, -- re-execs it to continue. -- Otherwise, runs the IO action to continue. buildFirst :: CanRebuild -> CmdLine -> IO () -> IO () buildFirst CanRebuild cmdline next = do oldtime <- getmtime buildPropellor newtime <- getmtime if newtime == oldtime then next else continueAfterBuild cmdline where getmtime = catchMaybeIO $ getModificationTime "propellor" buildFirst NoRebuild _ next = next continueAfterBuild :: CmdLine -> IO a continueAfterBuild cmdline = go =<< boolSystem "./propellor" [ Param "--continue" , Param (show cmdline) ] where go True = exitSuccess go False = exitWith (ExitFailure 1) fetchFirst :: IO () -> IO () fetchFirst next = do whenM hasOrigin $ void fetchOrigin next updateFirst :: CanRebuild -> CmdLine -> IO () -> IO () updateFirst canrebuild cmdline next = ifM hasOrigin ( updateFirst' canrebuild cmdline next , next ) -- If changes can be fetched from origin, Builds propellor (when allowed) -- and re-execs the updated propellor binary to continue. -- Otherwise, runs the IO action to continue. updateFirst' :: CanRebuild -> CmdLine -> IO () -> IO () updateFirst' CanRebuild cmdline next = ifM fetchOrigin ( do buildPropellor continueAfterBuild cmdline , next ) updateFirst' NoRebuild _ next = next -- Gets the fully qualified domain name, given a string that might be -- a short name to look up in the DNS. hostname :: String -> IO HostName hostname s = go =<< catchDefaultIO [] dnslookup where dnslookup = getAddrInfo (Just canonname) (Just s) Nothing canonname = defaultHints { addrFlags = [AI_CANONNAME] } go (AddrInfo { addrCanonName = Just v } : _) = pure v go _ | "." `isInfixOf` s = pure s -- assume it's a fqdn | otherwise = error $ "cannot find host " ++ s ++ " in the DNS"