diff --git a/GPL b/GPL new file mode 100644 --- /dev/null +++ b/GPL @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile b/Makefile new file mode 100644 --- /dev/null +++ b/Makefile @@ -0,0 +1,28 @@ +run: pull build + ./propellor + +devel: build tags + +pull: + git pull + +build: deps dist/setup-config + cabal build || (cabal configure; cabal build) + ln -sf dist/build/propellor/propellor + +deps: + @if [ $$(whoami) = root ]; then apt-get install ghc cabal-install libghc-missingh-dev libghc-ansi-terminal-dev libghc-ifelse-dev libghc-unix-compat-dev libghc-hslogger-dev; fi || true + +dist/setup-config: propellor.cabal + cabal configure + +clean: + rm -rf dist Setup tags propellor privdata/local + find -name \*.o -exec rm {} \; + find -name \*.hi -exec rm {} \; + +# hothasktags chokes on some template haskell etc, so ignore errors +tags: + find . | grep -v /.git/ | grep -v /tmp/ | grep -v /dist/ | grep -v /doc/ | egrep '\.hs$$' | xargs hothasktags > tags 2>/dev/null + +.PHONY: tags diff --git a/Propellor.hs b/Propellor.hs new file mode 100644 --- /dev/null +++ b/Propellor.hs @@ -0,0 +1,25 @@ +-- | Pulls in lots of useful modules for building Properties. + +module Propellor (module X) where + +import Propellor.Types as X +import Propellor.Property as X +import Propellor.Property.Cmd as X +import Propellor.PrivData as X + +import Utility.PartialPrelude as X +import Utility.Process as X +import Utility.Exception as X +import Utility.Env as X +import Utility.Directory as X +import Utility.Tmp as X +import Utility.Monad as X +import Utility.Misc as X + +import System.Directory as X +import System.IO as X +import System.FilePath as X +import Data.Maybe as X +import Data.Either as X +import Control.Applicative as X +import Control.Monad as X diff --git a/Propellor/CmdLine.hs b/Propellor/CmdLine.hs new file mode 100644 --- /dev/null +++ b/Propellor/CmdLine.hs @@ -0,0 +1,108 @@ +module Propellor.CmdLine where + +import System.Environment +import Data.List +import System.Exit + +import Propellor +import Utility.FileMode +import Utility.SafeCommand + +data CmdLine + = Run HostName + | Spin HostName + | Boot HostName + | Set HostName PrivDataField + +processCmdLine :: IO CmdLine +processCmdLine = go =<< getArgs + where + go ("--help":_) = usage + go ("--spin":h:[]) = return $ Spin h + go ("--boot":h:[]) = return $ Boot h + go ("--set":h:f:[]) = case readish f of + Just pf -> return $ Set h pf + Nothing -> error $ "Unknown privdata field " ++ f + go (h:[]) = return $ Run h + go [] = do + s <- takeWhile (/= '\n') <$> readProcess "hostname" ["-f"] + if null s + then error "Cannot determine hostname! Pass it on the command line." + else return $ Run s + go _ = usage + +usage :: IO a +usage = do + putStrLn $ unlines + [ "Usage:" + , " propellor" + , " propellor hostname" + , " propellor --spin hostname" + , " propellor --set hostname field" + ] + exitFailure + +defaultMain :: (HostName -> Maybe [Property]) -> IO () +defaultMain getprops = go =<< processCmdLine + where + go (Run host) = maybe (unknownhost host) ensureProperties (getprops host) + go (Spin host) = spin host + go (Boot host) = maybe (unknownhost host) boot (getprops host) + go (Set host field) = setPrivData host field + +unknownhost :: HostName -> IO a +unknownhost h = error $ unwords + [ "Unknown host:", h + , "(perhaps you should specify the real hostname on the command line?)" + ] + +spin :: HostName -> IO () +spin host = do + url <- getUrl + void $ boolSystem "git" [Param "commit", Param "-a", Param "-m", Param "propellor spin"] + void $ boolSystem "git" [Param "push"] + privdata <- gpgDecrypt (privDataFile host) + withHandle StdinHandle createProcessSuccess + (proc "ssh" ["root@"++host, bootstrap url]) $ \h -> do + hPutStr h $ unlines $ map (privDataMarker ++) $ lines privdata + hClose h + where + bootstrap url = shellWrap $ intercalate " && " + [ intercalate " ; " + [ "if [ ! -d " ++ localdir ++ " ]" + , "then " ++ intercalate " && " + [ "apt-get -y install git" + , "git clone " ++ url ++ " " ++ localdir + ] + , "fi" + ] + , "cd " ++ localdir + , "make pull build" + , "./propellor --boot " ++ host + ] + +boot :: [Property] -> IO () +boot props = do + privdata <- map (drop $ length privDataMarker ) + . filter (privDataMarker `isPrefixOf`) + . lines + <$> getContents + makePrivDataDir + writeFileProtected privDataLocal (unlines privdata) + ensureProperties props + +localdir :: FilePath +localdir = "/usr/local/propellor" + +getUrl :: IO String +getUrl = fromMaybe nourl <$> getM get urls + where + urls = ["remote.deploy.url", "remote.origin.url"] + nourl = error $ "Cannot find deploy url in " ++ show urls + get u = do + v <- catchMaybeIO $ + takeWhile (/= '\n') + <$> readProcess "git" ["config", u] + return $ case v of + Just url | not (null url) -> Just url + _ -> Nothing diff --git a/Propellor/PrivData.hs b/Propellor/PrivData.hs new file mode 100644 --- /dev/null +++ b/Propellor/PrivData.hs @@ -0,0 +1,85 @@ +module Propellor.PrivData where + +import qualified Data.Map as M +import Control.Applicative +import System.FilePath +import System.IO +import System.Directory +import Data.Maybe +import Control.Monad + +import Propellor.Types +import Propellor.Property +import Utility.Monad +import Utility.PartialPrelude +import Utility.Exception +import Utility.Process +import Utility.Tmp +import Utility.SafeCommand +import Utility.Misc + +{- | Note that removing or changing field names will break the + - serialized privdata files, so don't do that! + - It's fine to add new fields. -} +data PrivDataField + = DockerAuthentication + | SshPrivKey UserName + | Password UserName + deriving (Read, Show, Ord, Eq) + +withPrivData :: PrivDataField -> (String -> IO Result) -> IO Result +withPrivData field a = maybe missing a =<< getPrivData field + where + missing = do + warningMessage $ "Missing privdata " ++ show field + return FailedChange + +getPrivData :: PrivDataField -> IO (Maybe String) +getPrivData field = do + m <- catchDefaultIO Nothing $ readish <$> readFile privDataLocal + return $ maybe Nothing (M.lookup field) m + +setPrivData :: HostName -> PrivDataField -> IO () +setPrivData host field = do + putStrLn "Enter private data on stdin; ctrl-D when done:" + value <- hGetContentsStrict stdin + makePrivDataDir + let f = privDataFile host + m <- fromMaybe M.empty . readish <$> gpgDecrypt f + let m' = M.insert field value m + gpgEncrypt f (show m') + putStrLn "Private data set." + void $ boolSystem "git" [Param "add", File f] + +makePrivDataDir :: IO () +makePrivDataDir = createDirectoryIfMissing False privDataDir + +privDataDir :: FilePath +privDataDir = "privdata" + +privDataFile :: HostName -> FilePath +privDataFile host = privDataDir host ++ ".gpg" + +privDataLocal :: FilePath +privDataLocal = privDataDir "local" + +privDataMarker :: String +privDataMarker = "PRIVDATA " + +gpgDecrypt :: FilePath -> IO String +gpgDecrypt f = ifM (doesFileExist f) + ( readProcess "gpg" ["--decrypt", f] + , return "" + ) + +gpgEncrypt :: FilePath -> String -> IO () +gpgEncrypt f s = do + encrypted <- writeReadProcessEnv "gpg" + [ "--default-recipient-self" + , "--armor" + , "--encrypt" + ] + Nothing + (Just $ flip hPutStr s) + Nothing + viaTmp writeFile f encrypted diff --git a/Propellor/Property.hs b/Propellor/Property.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property.hs @@ -0,0 +1,123 @@ +module Propellor.Property where + +import System.Directory +import Control.Monad +import System.Console.ANSI +import System.Exit +import System.IO + +import Propellor.Types +import Utility.Monad +import Utility.Exception + +makeChange :: IO () -> IO Result +makeChange a = a >> return MadeChange + +noChange :: IO Result +noChange = return NoChange + +{- | Combines a list of properties, resulting in a single property + - that when run will run each property in the list in turn, + - and print out the description of each as it's run. Does not stop + - on failure; does propigate overall success/failure. + -} +propertyList :: Desc -> [Property] -> Property +propertyList desc ps = Property desc $ ensureProperties' ps + +{- | Combines a list of properties, resulting in one property that + - ensures each in turn, stopping on failure. -} +combineProperties :: [Property] -> Property +combineProperties ps = Property desc $ go ps NoChange + where + go [] rs = return rs + go (l:ls) rs = do + r <- ensureProperty l + case r of + FailedChange -> return FailedChange + _ -> go ls (combineResult r rs) + desc = case ps of + (p:_) -> propertyDesc p + _ -> "(empty)" + +{- | Makes a perhaps non-idempotent Property be idempotent by using a flag + - file to indicate whether it has run before. + - Use with caution. -} +flagFile :: Property -> FilePath -> Property +flagFile property flagfile = Property (propertyDesc property) $ + go =<< doesFileExist flagfile + where + go True = return NoChange + go False = do + r <- ensureProperty property + when (r == MadeChange) $ + writeFile flagfile "" + return r + +{- | Whenever a change has to be made for a Property, causes a hook + - Property to also be run, but not otherwise. -} +onChange :: Property -> Property -> Property +property `onChange` hook = Property (propertyDesc property) $ do + r <- ensureProperty property + case r of + MadeChange -> do + r' <- ensureProperty hook + return $ combineResult r r' + _ -> return r + +{- | Indicates that the first property can only be satisfied once + - the second is. -} +requires :: Property -> Property -> Property +x `requires` y = combineProperties [y, x] `describe` propertyDesc x + +describe :: Property -> Desc -> Property +describe p d = p { propertyDesc = d } + +(==>) :: Desc -> Property -> Property +(==>) = flip describe +infixl 1 ==> + +{- | Makes a Property only be performed when a test succeeds. -} +check :: IO Bool -> Property -> Property +check c property = Property (propertyDesc property) $ ifM c + ( ensureProperty property + , return NoChange + ) + +ensureProperty :: Property -> IO Result +ensureProperty = catchDefaultIO FailedChange . propertySatisfy + +ensureProperties :: [Property] -> IO () +ensureProperties ps = do + r <- ensureProperties' [propertyList "overall" ps] + case r of + FailedChange -> exitWith (ExitFailure 1) + _ -> exitWith ExitSuccess + +ensureProperties' :: [Property] -> IO Result +ensureProperties' ps = ensure ps NoChange + where + ensure [] rs = return rs + ensure (l:ls) rs = do + r <- ensureProperty l + clearFromCursorToLineBeginning + setCursorColumn 0 + putStr $ propertyDesc l ++ "... " + case r of + FailedChange -> do + setSGR [SetColor Foreground Vivid Red] + putStrLn "failed" + NoChange -> do + setSGR [SetColor Foreground Dull Green] + putStrLn "unchanged" + MadeChange -> do + setSGR [SetColor Foreground Vivid Green] + putStrLn "done" + setSGR [] + ensure ls (combineResult r rs) + +warningMessage :: String -> IO () +warningMessage s = do + setSGR [SetColor Foreground Vivid Red] + putStrLn $ "** warning: " ++ s + setSGR [] + hFlush stdout diff --git a/Propellor/Property/Apt.hs b/Propellor/Property/Apt.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Apt.hs @@ -0,0 +1,132 @@ +module Propellor.Property.Apt where + +import Data.Maybe +import Control.Applicative +import Data.List +import System.IO +import Control.Monad + +import Propellor +import qualified Propellor.Property.File as File +import Propellor.Property.File (Line) + +sourcesList :: FilePath +sourcesList = "/etc/apt/sources.list" + +type Url = String +type Section = String + +data Suite = Stable | Testing | Unstable | Experimental + deriving Show + +showSuite :: Suite -> String +showSuite Stable = "stable" +showSuite Testing = "testing" +showSuite Unstable = "unstable" +showSuite Experimental = "experimental" + +debLine :: Suite -> Url -> [Section] -> Line +debLine suite mirror sections = unwords $ + ["deb", mirror, showSuite suite] ++ sections + +srcLine :: Line -> Line +srcLine l = case words l of + ("deb":rest) -> unwords $ "deb-src" : rest + _ -> "" + +stdSections :: [Section] +stdSections = ["main", "contrib", "non-free"] + +debCdn :: Suite -> [Line] +debCdn suite = [l, srcLine l] + where + l = debLine suite "http://cdn.debian.net/debian" stdSections + +{- | Makes sources.list have a standard content using the mirror CDN, + - with a particular Suite. -} +stdSourcesList :: Suite -> Property +stdSourcesList suite = setSourcesList (debCdn suite) + `describe` ("standard sources.list for " ++ show suite) + +setSourcesList :: [Line] -> Property +setSourcesList ls = sourcesList `File.hasContent` ls `onChange` update + +runApt :: [String] -> Property +runApt ps = cmdProperty' "apt-get" ps env + where + env = + [ ("DEBIAN_FRONTEND", "noninteractive") + , ("APT_LISTCHANGES_FRONTEND", "none") + ] + +update :: Property +update = runApt ["update"] + `describe` "apt update" + +upgrade :: Property +upgrade = runApt ["-y", "dist-upgrade"] + `describe` "apt dist-upgrade" + +type Package = String + +installed :: [Package] -> Property +installed ps = check (isInstallable ps) go + `describe` (unwords $ "apt installed":ps) + where + go = runApt $ ["-y", "install"] ++ ps + +removed :: [Package] -> Property +removed ps = check (or <$> isInstalled' ps) go + `describe` (unwords $ "apt removed":ps) + where + go = runApt $ ["-y", "remove"] ++ ps + +isInstallable :: [Package] -> IO Bool +isInstallable ps = do + l <- isInstalled' ps + return $ any (== False) l && not (null l) + +isInstalled :: Package -> IO Bool +isInstalled p = (== [True]) <$> isInstalled' [p] + +-- | Note that the order of the returned list will not always +-- correspond to the order of the input list. The number of items may +-- even vary. If apt does not know about a package at all, it will not +-- be included in the result list. +isInstalled' :: [Package] -> IO [Bool] +isInstalled' ps = catMaybes . map parse . lines + <$> readProcess "apt-cache" ("policy":ps) + where + parse l + | "Installed: (none)" `isInfixOf` l = Just False + | "Installed: " `isInfixOf` l = Just True + | otherwise = Nothing + +autoRemove :: Property +autoRemove = runApt ["-y", "autoremove"] + `describe` "apt autoremove" + +unattendedUpgrades :: Bool -> Property +unattendedUpgrades enabled = + (if enabled then installed else removed) ["unattended-upgrades"] + `onChange` reConfigure "unattended-upgrades" + [("unattended-upgrades/enable_auto_updates" , "boolean", v)] + `describe` ("unattended upgrades " ++ v) + where + v + | enabled = "true" + | otherwise = "false" + +-- | Preseeds debconf values and reconfigures the package so it takes +-- effect. +reConfigure :: Package -> [(String, String, String)] -> Property +reConfigure package vals = reconfigure `requires` setselections + `describe` ("reconfigure " ++ package) + where + setselections = Property "preseed" $ makeChange $ + withHandle StdinHandle createProcessSuccess + (proc "debconf-set-selections" []) $ \h -> do + forM_ vals $ \(template, tmpltype, value) -> + hPutStrLn h $ unwords [package, template, tmpltype, value] + hClose h + reconfigure = cmdProperty "dpkg-reconfigure" ["-fnone", package] diff --git a/Propellor/Property/Cmd.hs b/Propellor/Property/Cmd.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Cmd.hs @@ -0,0 +1,37 @@ +module Propellor.Property.Cmd ( + cmdProperty, + cmdProperty', + scriptProperty +) where + +import Control.Applicative +import Data.List + +import Propellor.Types +import Utility.Monad +import Utility.SafeCommand +import Utility.Env + +-- | A property that can be satisfied by running a command. +-- +-- The command must exit 0 on success. +cmdProperty :: String -> [String] -> Property +cmdProperty cmd params = cmdProperty' cmd params [] + +-- | A property that can be satisfied by running a command, +-- with added environment. +cmdProperty' :: String -> [String] -> [(String, String)] -> Property +cmdProperty' cmd params env = Property desc $ do + env' <- addEntries env <$> getEnvironment + ifM (boolSystemEnv cmd (map Param params) (Just env')) + ( return MadeChange + , return FailedChange + ) + where + desc = unwords $ cmd : params + +-- | A property that can be satisfied by running a series of shell commands. +scriptProperty :: [String] -> Property +scriptProperty script = cmdProperty "sh" ["-c", shellcmd] + where + shellcmd = intercalate " ; " ("set -e" : script) diff --git a/Propellor/Property/Docker.hs b/Propellor/Property/Docker.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Docker.hs @@ -0,0 +1,16 @@ +module Propellor.Property.Docker where + +import Propellor +import qualified Propellor.Property.File as File +import qualified Propellor.Property.Apt as Apt + +-- | Configures docker with an authentication file, so that images can be +-- pushed to index.docker.io. +configured :: Property +configured = Property "docker configured" go `requires` installed + where + go = withPrivData DockerAuthentication $ \cfg -> ensureProperty $ + "/root/.dockercfg" `File.hasContent` (lines cfg) + +installed :: Property +installed = Apt.installed ["docker.io"] diff --git a/Propellor/Property/File.hs b/Propellor/Property/File.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/File.hs @@ -0,0 +1,40 @@ +module Propellor.Property.File where + +import Propellor + +type Line = String + +{- | Replaces all the content of a file. -} +hasContent :: FilePath -> [Line] -> Property +f `hasContent` newcontent = fileProperty ("replace " ++ f) + (\_oldcontent -> newcontent) f + +{- | Ensures that a line is present in a file, adding it to the end if not. -} +containsLine :: FilePath -> Line -> Property +f `containsLine` l = fileProperty (f ++ " contains:" ++ l) go f + where + go ls + | l `elem` ls = ls + | otherwise = ls++[l] + +{- | Ensures that a line is not present in a file. + - Note that the file is ensured to exist, so if it doesn't, an empty + - file will be written. -} +lacksLine :: FilePath -> Line -> Property +f `lacksLine` l = fileProperty (f ++ " remove: " ++ l) (filter (/= l)) f + +{- | Removes a file. Does not remove symlinks or non-plain-files. -} +notPresent :: FilePath -> Property +notPresent f = check (doesFileExist f) $ Property (f ++ " not present") $ + makeChange $ nukeFile f + +fileProperty :: Desc -> ([Line] -> [Line]) -> FilePath -> Property +fileProperty desc a f = Property desc $ go =<< doesFileExist f + where + go True = do + ls <- lines <$> catchDefaultIO [] (readFile f) + let ls' = a ls + if ls' == ls + then noChange + else makeChange $ viaTmp writeFile f (unlines ls') + go False = makeChange $ writeFile f (unlines $ a []) diff --git a/Propellor/Property/GitHome.hs b/Propellor/Property/GitHome.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/GitHome.hs @@ -0,0 +1,31 @@ +module Propellor.Property.GitHome where + +import Propellor +import qualified Propellor.Property.Apt as Apt +import Propellor.Property.User +import Utility.SafeCommand + +{- | Clones Joey Hess's git home directory, and runs its fixups script. -} +installedFor :: UserName -> Property +installedFor user = check (not <$> hasGitDir user) $ + Property ("githome " ++ user) (go =<< homedir user) + `requires` Apt.installed ["git", "myrepos"] + where + go Nothing = noChange + go (Just home) = do + let tmpdir = home "githome" + ok <- boolSystem "git" [Param "clone", Param url, Param tmpdir] + <&&> (and <$> moveout tmpdir home) + <&&> (catchBoolIO $ removeDirectory tmpdir >> return True) + <&&> boolSystem "su" [Param "-c", Param "cd; rm -rf .aptitude/ .bashrc .profile; mr checkout; bin/fixups", Param user] + return $ if ok then MadeChange else FailedChange + moveout tmpdir home = do + fs <- dirContents tmpdir + forM fs $ \f -> boolSystem "mv" [File f, File home] + url = "git://git.kitenet.net/joey/home" + +hasGitDir :: UserName -> IO Bool +hasGitDir user = go =<< homedir user + where + go Nothing = return False + go (Just home) = doesDirectoryExist (home ".git") diff --git a/Propellor/Property/Hostname.hs b/Propellor/Property/Hostname.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Hostname.hs @@ -0,0 +1,9 @@ +module Propellor.Property.Hostname where + +import Propellor +import qualified Propellor.Property.File as File + +set :: HostName -> Property +set hostname = "/etc/hostname" `File.hasContent` [hostname] + `onChange` cmdProperty "hostname" [hostname] + `describe` ("hostname " ++ hostname) diff --git a/Propellor/Property/JoeySites.hs b/Propellor/Property/JoeySites.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/JoeySites.hs @@ -0,0 +1,23 @@ +-- | Specific configuation for Joey Hess's sites. Probably not useful to +-- others except as an example. + +module Propellor.Property.JoeySites where + +import Propellor +import qualified Propellor.Property.Apt as Apt + +oldUseNetshellBox :: Property +oldUseNetshellBox = check (not <$> Apt.isInstalled "oldusenet") $ + propertyList ("olduse.net shellbox") + [ Apt.installed (words "build-essential devscripts debhelper git libncursesw5-dev libpcre3-dev pkg-config bison libicu-dev libidn11-dev libcanlock2-dev libuu-dev ghc libghc-strptime-dev libghc-hamlet-dev libghc-ifelse-dev libghc-hxt-dev libghc-utf8-string-dev libghc-missingh-dev libghc-sha-dev") + `describe` "olduse.net build deps" + , scriptProperty + [ "rm -rf /root/tmp/oldusenet" -- idenpotency + , "git clone git://olduse.net/ /root/tmp/oldusenet/source" + , "cd /root/tmp/oldusenet/source/" + , "dpkg-buildpackage -us -uc" + , "dpkg -i ../oldusenet*.deb || true" + , "apt-get -fy install" -- dependencies + , "rm -rf /root/tmp/oldusenet" + ] `describe` "olduse.net built" + ] diff --git a/Propellor/Property/Network.hs b/Propellor/Property/Network.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Network.hs @@ -0,0 +1,27 @@ +module Propellor.Property.Network where + +import Propellor +import Propellor.Property.File + +interfaces :: FilePath +interfaces = "/etc/network/interfaces" + +-- | 6to4 ipv6 connection, should work anywhere +ipv6to4 :: Property +ipv6to4 = fileProperty "ipv6to4" go interfaces + `onChange` ifUp "sit0" + where + go ls + | all (`elem` ls) stanza = ls + | otherwise = ls ++ stanza + stanza = + [ "# Automatically added by propeller" + , "iface sit0 inet6 static" + , "\taddress 2002:5044:5531::1" + , "\tnetmask 64" + , "\tgateway ::192.88.99.1" + , "# End automatically added by propeller" + ] + +ifUp :: String -> Property +ifUp iface = cmdProperty "ifup" [iface] diff --git a/Propellor/Property/Reboot.hs b/Propellor/Property/Reboot.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Reboot.hs @@ -0,0 +1,7 @@ +module Propellor.Property.Reboot where + +import Propellor + +now :: Property +now = cmdProperty "reboot" [] + `describe` "reboot now" diff --git a/Propellor/Property/Ssh.hs b/Propellor/Property/Ssh.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Ssh.hs @@ -0,0 +1,54 @@ +module Propellor.Property.Ssh where + +import Propellor +import qualified Propellor.Property.File as File +import Propellor.Property.User +import Utility.SafeCommand + +sshBool :: Bool -> String +sshBool True = "yes" +sshBool False = "no" + +sshdConfig :: FilePath +sshdConfig = "/etc/ssh/sshd_config" + +setSshdConfig :: String -> Bool -> Property +setSshdConfig setting allowed = combineProperties + [ sshdConfig `File.lacksLine` (sshline $ not allowed) + , sshdConfig `File.containsLine` (sshline allowed) + ] + `onChange` restartSshd + `describe` unwords [ "ssh config:", setting, sshBool allowed ] + where + sshline v = setting ++ " " ++ sshBool v + +permitRootLogin :: Bool -> Property +permitRootLogin = setSshdConfig "PermitRootLogin" + +passwordAuthentication :: Bool -> Property +passwordAuthentication = setSshdConfig "PasswordAuthentication" + +hasAuthorizedKeys :: UserName -> IO Bool +hasAuthorizedKeys = go <=< homedir + where + go Nothing = return False + go (Just home) = not . null <$> catchDefaultIO "" + (readFile $ home ".ssh" "authorized_keys") + +restartSshd :: Property +restartSshd = cmdProperty "service" ["ssh", "restart"] + +{- | Blow away existing host keys and make new ones. Use a flag + - file to prevent doing this more than once. -} +uniqueHostKeys :: Property +uniqueHostKeys = flagFile prop "/etc/ssh/.unique_host_keys" + `onChange` restartSshd + where + prop = Property "ssh unique host keys" $ do + void $ boolSystem "sh" + [ Param "-c" + , Param "rm -f /etc/ssh/ssh_host_*" + ] + ensureProperty $ + cmdProperty "/var/lib/dpkg/info/openssh-server.postinst" + ["configure"] diff --git a/Propellor/Property/Sudo.hs b/Propellor/Property/Sudo.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Sudo.hs @@ -0,0 +1,34 @@ +module Propellor.Property.Sudo where + +import Data.List + +import Propellor +import Propellor.Property.File +import qualified Propellor.Property.Apt as Apt +import Propellor.Property.User + +{- | Allows a user to sudo. If the user has a password, sudo is configured + - to require it. If not, NOPASSWORD is enabled for the user. + - + - TOOD: Full sudoers file format parse.. + -} +enabledFor :: UserName -> Property +enabledFor user = Property desc go `requires` Apt.installed ["sudo"] + where + go = do + locked <- isLockedPassword user + ensureProperty $ + fileProperty desc + (modify locked . filter (wanted locked)) + "/etc/sudoers" + desc = user ++ " is sudoer" + sudobaseline = user ++ " ALL=(ALL:ALL)" + sudoline True = sudobaseline ++ " NOPASSWD:ALL" + sudoline False = sudobaseline ++ " ALL" + wanted locked l + | not (sudobaseline `isPrefixOf` l) = True + | "NOPASSWD" `isInfixOf` l = locked + | otherwise = True + modify locked ls + | sudoline locked `elem` ls = ls + | otherwise = ls ++ [sudoline locked] diff --git a/Propellor/Property/Tor.hs b/Propellor/Property/Tor.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/Tor.hs @@ -0,0 +1,19 @@ +module Propellor.Property.Tor where + +import Propellor +import qualified Propellor.Property.File as File +import qualified Propellor.Property.Apt as Apt + +isBridge :: Property +isBridge = setup `requires` Apt.installed ["tor"] + `describe` "tor bridge" + where + setup = "/etc/tor/torrc" `File.hasContent` + [ "SocksPort 0" + , "ORPort 443" + , "BridgeRelay 1" + , "Exitpolicy reject *:*" + ] `onChange` restartTor + +restartTor :: Property +restartTor = cmdProperty "service" ["tor", "restart"] diff --git a/Propellor/Property/User.hs b/Propellor/Property/User.hs new file mode 100644 --- /dev/null +++ b/Propellor/Property/User.hs @@ -0,0 +1,61 @@ +module Propellor.Property.User where + +import System.Posix + +import Propellor + +data Eep = YesReallyDeleteHome + +sshAccountFor :: UserName -> Property +sshAccountFor user = check (isNothing <$> homedir user) $ cmdProperty "adduser" + [ "--disabled-password" + , "--gecos", "" + , user + ] + `describe` ("ssh account " ++ user) + +{- | Removes user home directory!! Use with caution. -} +nuked :: UserName -> Eep -> Property +nuked user _ = check (isJust <$> homedir user) $ cmdProperty "userdel" + [ "-r" + , user + ] + `describe` ("nuked user " ++ user) + +{- | Only ensures that the user has some password set. It may or may + - not be the password from the PrivData. -} +hasSomePassword :: UserName -> Property +hasSomePassword user = check ((/= HasPassword) <$> getPasswordStatus user) $ + hasPassword user + +hasPassword :: UserName -> Property +hasPassword user = Property (user ++ " has password") $ + withPrivData (Password user) $ \password -> makeChange $ + withHandle StdinHandle createProcessSuccess + (proc "chpasswd" []) $ \h -> do + hPutStrLn h $ user ++ ":" ++ password + hClose h + +lockedPassword :: UserName -> Property +lockedPassword user = check (not <$> isLockedPassword user) $ cmdProperty "passwd" + [ "--lock" + , user + ] + `describe` ("locked " ++ user ++ " password") + +data PasswordStatus = NoPassword | LockedPassword | HasPassword + deriving (Eq) + +getPasswordStatus :: UserName -> IO PasswordStatus +getPasswordStatus user = parse . words <$> readProcess "passwd" ["-S", user] + where + parse (_:"L":_) = LockedPassword + parse (_:"NP":_) = NoPassword + parse (_:"P":_) = HasPassword + parse _ = NoPassword + +isLockedPassword :: UserName -> IO Bool +isLockedPassword user = (== LockedPassword) <$> getPasswordStatus user + +homedir :: UserName -> IO (Maybe FilePath) +homedir user = catchMaybeIO $ homeDirectory <$> getUserEntryForName user diff --git a/Propellor/Types.hs b/Propellor/Types.hs new file mode 100644 --- /dev/null +++ b/Propellor/Types.hs @@ -0,0 +1,22 @@ +module Propellor.Types where + +type HostName = String +type UserName = String + +data Property = Property + { propertyDesc :: Desc + -- | must be idempotent; may run repeatedly + , propertySatisfy :: IO Result + } + +type Desc = String + +data Result = NoChange | MadeChange | FailedChange + deriving (Show, Eq) + +combineResult :: Result -> Result -> Result +combineResult FailedChange _ = FailedChange +combineResult _ FailedChange = FailedChange +combineResult MadeChange _ = MadeChange +combineResult _ MadeChange = MadeChange +combineResult NoChange NoChange = NoChange diff --git a/README b/README new file mode 100644 --- /dev/null +++ b/README @@ -0,0 +1,42 @@ +This is a work in progress configuration management system using Haskell +and Git. + +Propellor enures that the system it's run in satisfies a list of +properties, taking action as necessary when a property is not yet met. + +The design is intentionally very minimal. + +Propellor lives in a git repository, and so to set it up it's cloned +to a system, and "make" can be used to pull down any new changes, +and compile and run propellor. This can be done by a cron job, or +something can ssh in and run it. + +Properties are defined using Haskell. Edit config.hs to get started. + +There is no special language as used in puppet, chef, ansible, etc.. just +the full power of Haskell. Hopefully that power can be put to good use in +making declarative properties that are powerful, nicely idempotent, and +easy to adapt to a system's special needs. + +Also avoided is any form of node classification. Ie, which hosts are part +of which classes and share which configuration. It might be nice to use +reclass[1], but then again a host is configured using simply haskell code, +and so it's easy to factor out things like classes of hosts as desired. + +To bootstrap propellor on a new host, use: propellor --spin $host +This looks up the git repository's remote.origin.url (or remote.deploy.url +if available) and logs into the host, clones the url (if not already +done), and sets up and runs propellor in /usr/local/propellor + +Private data such as passwords, ssh private keys, etc should not be checked +into a propellor git repository in the clear, unless you want to restrict +access to the repository. Which would probably involve a separate fork +for each host and be annoying. + +Instead, propellor --spin $host looks for a privdata/$host.gpg file and +if found decrypts it and sends it to the host using ssh. To set a field +in such a file, use: propellor --set $host $field +The field name will be something like 'Password "root"'; see PrivData.hs +for available fields. + +[1] http://reclass.pantsfullofunix.net/ diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,5 @@ +{- cabal setup file -} + +import Distribution.Simple + +main = defaultMain diff --git a/TODO b/TODO new file mode 100644 --- /dev/null +++ b/TODO @@ -0,0 +1,5 @@ +* Need a way to run an action when a property changes, but only + run it once for the whole. For example, may want to restart apache, + but only once despite many config changes being made to satisfy + properties. onChange is a poor substitute. +* I often seem to want to be able to combine Properties monadically. diff --git a/Utility/Applicative.hs b/Utility/Applicative.hs new file mode 100644 --- /dev/null +++ b/Utility/Applicative.hs @@ -0,0 +1,16 @@ +{- applicative stuff + - + - Copyright 2012 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +module Utility.Applicative where + +{- Like <$> , but supports one level of currying. + - + - foo v = bar <$> action v == foo = bar <$$> action + -} +(<$$>) :: Functor f => (a -> b) -> (c -> f a) -> c -> f b +f <$$> v = fmap f . v +infixr 4 <$$> diff --git a/Utility/Data.hs b/Utility/Data.hs new file mode 100644 --- /dev/null +++ b/Utility/Data.hs @@ -0,0 +1,17 @@ +{- utilities for simple data types + - + - Copyright 2013 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +module Utility.Data where + +{- First item in the list that is not Nothing. -} +firstJust :: Eq a => [Maybe a] -> Maybe a +firstJust ms = case dropWhile (== Nothing) ms of + [] -> Nothing + (md:_) -> md + +eitherToMaybe :: Either a b -> Maybe b +eitherToMaybe = either (const Nothing) Just diff --git a/Utility/Directory.hs b/Utility/Directory.hs new file mode 100644 --- /dev/null +++ b/Utility/Directory.hs @@ -0,0 +1,135 @@ +{- directory manipulation + - + - Copyright 2011-2014 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP #-} + +module Utility.Directory where + +import System.IO.Error +import System.Directory +import Control.Exception (throw) +import Control.Monad +import Control.Monad.IfElse +import System.FilePath +import Control.Applicative +import System.IO.Unsafe (unsafeInterleaveIO) + +import Utility.PosixFiles +import Utility.SafeCommand +import Utility.Tmp +import Utility.Exception +import Utility.Monad +import Utility.Applicative + +dirCruft :: FilePath -> Bool +dirCruft "." = True +dirCruft ".." = True +dirCruft _ = False + +{- Lists the contents of a directory. + - Unlike getDirectoryContents, paths are not relative to the directory. -} +dirContents :: FilePath -> IO [FilePath] +dirContents d = map (d ) . filter (not . dirCruft) <$> getDirectoryContents d + +{- Gets files in a directory, and then its subdirectories, recursively, + - and lazily. + - + - Does not follow symlinks to other subdirectories. + - + - When the directory does not exist, no exception is thrown, + - instead, [] is returned. -} +dirContentsRecursive :: FilePath -> IO [FilePath] +dirContentsRecursive topdir = dirContentsRecursiveSkipping (const False) True topdir + +{- Skips directories whose basenames match the skipdir. -} +dirContentsRecursiveSkipping :: (FilePath -> Bool) -> Bool -> FilePath -> IO [FilePath] +dirContentsRecursiveSkipping skipdir followsubdirsymlinks topdir = go [topdir] + where + go [] = return [] + go (dir:dirs) + | skipdir (takeFileName dir) = go dirs + | otherwise = unsafeInterleaveIO $ do + (files, dirs') <- collect [] [] + =<< catchDefaultIO [] (dirContents dir) + files' <- go (dirs' ++ dirs) + return (files ++ files') + collect files dirs' [] = return (reverse files, reverse dirs') + collect files dirs' (entry:entries) + | dirCruft entry = collect files dirs' entries + | otherwise = do + let skip = collect (entry:files) dirs' entries + let recurse = collect files (entry:dirs') entries + ms <- catchMaybeIO $ getSymbolicLinkStatus entry + case ms of + (Just s) + | isDirectory s -> recurse + | isSymbolicLink s && followsubdirsymlinks -> + ifM (doesDirectoryExist entry) + ( recurse + , skip + ) + _ -> skip + +{- Gets the directory tree from a point, recursively and lazily, + - with leaf directories **first**, skipping any whose basenames + - match the skipdir. Does not follow symlinks. -} +dirTreeRecursiveSkipping :: (FilePath -> Bool) -> FilePath -> IO [FilePath] +dirTreeRecursiveSkipping skipdir topdir = go [] [topdir] + where + go c [] = return c + go c (dir:dirs) + | skipdir (takeFileName dir) = go c dirs + | otherwise = unsafeInterleaveIO $ do + subdirs <- go c + =<< filterM (isDirectory <$$> getSymbolicLinkStatus) + =<< catchDefaultIO [] (dirContents dir) + go (subdirs++[dir]) dirs + +{- Moves one filename to another. + - First tries a rename, but falls back to moving across devices if needed. -} +moveFile :: FilePath -> FilePath -> IO () +moveFile src dest = tryIO (rename src dest) >>= onrename + where + onrename (Right _) = noop + onrename (Left e) + | isPermissionError e = rethrow + | isDoesNotExistError e = rethrow + | otherwise = do + -- copyFile is likely not as optimised as + -- the mv command, so we'll use the latter. + -- But, mv will move into a directory if + -- dest is one, which is not desired. + whenM (isdir dest) rethrow + viaTmp mv dest undefined + where + rethrow = throw e + mv tmp _ = do + ok <- boolSystem "mv" [Param "-f", Param src, Param tmp] + unless ok $ do + -- delete any partial + _ <- tryIO $ removeFile tmp + rethrow + + isdir f = do + r <- tryIO $ getFileStatus f + case r of + (Left _) -> return False + (Right s) -> return $ isDirectory s + +{- Removes a file, which may or may not exist, and does not have to + - be a regular file. + - + - Note that an exception is thrown if the file exists but + - cannot be removed. -} +nukeFile :: FilePath -> IO () +nukeFile file = void $ tryWhenExists go + where +#ifndef mingw32_HOST_OS + go = removeLink file +#else + go = removeFile file +#endif diff --git a/Utility/Env.hs b/Utility/Env.hs new file mode 100644 --- /dev/null +++ b/Utility/Env.hs @@ -0,0 +1,81 @@ +{- portable environment variables + - + - Copyright 2013 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP #-} + +module Utility.Env where + +#ifdef mingw32_HOST_OS +import Utility.Exception +import Control.Applicative +import Data.Maybe +import qualified System.Environment as E +#else +import qualified System.Posix.Env as PE +#endif + +getEnv :: String -> IO (Maybe String) +#ifndef mingw32_HOST_OS +getEnv = PE.getEnv +#else +getEnv = catchMaybeIO . E.getEnv +#endif + +getEnvDefault :: String -> String -> IO String +#ifndef mingw32_HOST_OS +getEnvDefault = PE.getEnvDefault +#else +getEnvDefault var fallback = fromMaybe fallback <$> getEnv var +#endif + +getEnvironment :: IO [(String, String)] +#ifndef mingw32_HOST_OS +getEnvironment = PE.getEnvironment +#else +getEnvironment = E.getEnvironment +#endif + +{- Returns True if it could successfully set the environment variable. + - + - There is, apparently, no way to do this in Windows. Instead, + - environment varuables must be provided when running a new process. -} +setEnv :: String -> String -> Bool -> IO Bool +#ifndef mingw32_HOST_OS +setEnv var val overwrite = do + PE.setEnv var val overwrite + return True +#else +setEnv _ _ _ = return False +#endif + +{- Returns True if it could successfully unset the environment variable. -} +unsetEnv :: String -> IO Bool +#ifndef mingw32_HOST_OS +unsetEnv var = do + PE.unsetEnv var + return True +#else +unsetEnv _ = return False +#endif + +{- Adds the environment variable to the input environment. If already + - present in the list, removes the old value. + - + - This does not really belong here, but Data.AssocList is for some reason + - buried inside hxt. + -} +addEntry :: Eq k => k -> v -> [(k, v)] -> [(k, v)] +addEntry k v l = ( (k,v) : ) $! delEntry k l + +addEntries :: Eq k => [(k, v)] -> [(k, v)] -> [(k, v)] +addEntries = foldr (.) id . map (uncurry addEntry) . reverse + +delEntry :: Eq k => k -> [(k, v)] -> [(k, v)] +delEntry _ [] = [] +delEntry k (x@(k1,_) : rest) + | k == k1 = rest + | otherwise = ( x : ) $! delEntry k rest diff --git a/Utility/Exception.hs b/Utility/Exception.hs new file mode 100644 --- /dev/null +++ b/Utility/Exception.hs @@ -0,0 +1,59 @@ +{- Simple IO exception handling (and some more) + - + - Copyright 2011-2012 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE ScopedTypeVariables #-} + +module Utility.Exception where + +import Control.Exception +import qualified Control.Exception as E +import Control.Applicative +import Control.Monad +import System.IO.Error (isDoesNotExistError) +import Utility.Data + +{- Catches IO errors and returns a Bool -} +catchBoolIO :: IO Bool -> IO Bool +catchBoolIO a = catchDefaultIO False a + +{- Catches IO errors and returns a Maybe -} +catchMaybeIO :: IO a -> IO (Maybe a) +catchMaybeIO a = catchDefaultIO Nothing $ Just <$> a + +{- Catches IO errors and returns a default value. -} +catchDefaultIO :: a -> IO a -> IO a +catchDefaultIO def a = catchIO a (const $ return def) + +{- Catches IO errors and returns the error message. -} +catchMsgIO :: IO a -> IO (Either String a) +catchMsgIO a = either (Left . show) Right <$> tryIO a + +{- catch specialized for IO errors only -} +catchIO :: IO a -> (IOException -> IO a) -> IO a +catchIO = E.catch + +{- try specialized for IO errors only -} +tryIO :: IO a -> IO (Either IOException a) +tryIO = try + +{- Catches all exceptions except for async exceptions. + - This is often better to use than catching them all, so that + - ThreadKilled and UserInterrupt get through. + -} +catchNonAsync :: IO a -> (SomeException -> IO a) -> IO a +catchNonAsync a onerr = a `catches` + [ Handler (\ (e :: AsyncException) -> throw e) + , Handler (\ (e :: SomeException) -> onerr e) + ] + +tryNonAsync :: IO a -> IO (Either SomeException a) +tryNonAsync a = (Right <$> a) `catchNonAsync` (return . Left) + +{- Catches only DoesNotExist exceptions, and lets all others through. -} +tryWhenExists :: IO a -> IO (Maybe a) +tryWhenExists a = eitherToMaybe <$> + tryJust (guard . isDoesNotExistError) a diff --git a/Utility/FileMode.hs b/Utility/FileMode.hs new file mode 100644 --- /dev/null +++ b/Utility/FileMode.hs @@ -0,0 +1,155 @@ +{- File mode utilities. + - + - Copyright 2010-2012 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP #-} + +module Utility.FileMode where + +import System.IO +import Control.Monad +import Control.Exception (bracket) +import System.PosixCompat.Types +#ifndef mingw32_HOST_OS +import System.Posix.Files +#endif +import Foreign (complement) + +import Utility.Exception + +{- Applies a conversion function to a file's mode. -} +modifyFileMode :: FilePath -> (FileMode -> FileMode) -> IO () +modifyFileMode f convert = void $ modifyFileMode' f convert +modifyFileMode' :: FilePath -> (FileMode -> FileMode) -> IO FileMode +modifyFileMode' f convert = do + s <- getFileStatus f + let old = fileMode s + let new = convert old + when (new /= old) $ + setFileMode f new + return old + +{- Adds the specified FileModes to the input mode, leaving the rest + - unchanged. -} +addModes :: [FileMode] -> FileMode -> FileMode +addModes ms m = combineModes (m:ms) + +{- Removes the specified FileModes from the input mode. -} +removeModes :: [FileMode] -> FileMode -> FileMode +removeModes ms m = m `intersectFileModes` complement (combineModes ms) + +{- Runs an action after changing a file's mode, then restores the old mode. -} +withModifiedFileMode :: FilePath -> (FileMode -> FileMode) -> IO a -> IO a +withModifiedFileMode file convert a = bracket setup cleanup go + where + setup = modifyFileMode' file convert + cleanup oldmode = modifyFileMode file (const oldmode) + go _ = a + +writeModes :: [FileMode] +writeModes = [ownerWriteMode, groupWriteMode, otherWriteMode] + +readModes :: [FileMode] +readModes = [ownerReadMode, groupReadMode, otherReadMode] + +executeModes :: [FileMode] +executeModes = [ownerExecuteMode, groupExecuteMode, otherExecuteMode] + +{- Removes the write bits from a file. -} +preventWrite :: FilePath -> IO () +preventWrite f = modifyFileMode f $ removeModes writeModes + +{- Turns a file's owner write bit back on. -} +allowWrite :: FilePath -> IO () +allowWrite f = modifyFileMode f $ addModes [ownerWriteMode] + +{- Turns a file's owner read bit back on. -} +allowRead :: FilePath -> IO () +allowRead f = modifyFileMode f $ addModes [ownerReadMode] + +{- Allows owner and group to read and write to a file. -} +groupSharedModes :: [FileMode] +groupSharedModes = + [ ownerWriteMode, groupWriteMode + , ownerReadMode, groupReadMode + ] + +groupWriteRead :: FilePath -> IO () +groupWriteRead f = modifyFileMode f $ addModes groupSharedModes + +checkMode :: FileMode -> FileMode -> Bool +checkMode checkfor mode = checkfor `intersectFileModes` mode == checkfor + +{- Checks if a file mode indicates it's a symlink. -} +isSymLink :: FileMode -> Bool +#ifdef mingw32_HOST_OS +isSymLink _ = False +#else +isSymLink = checkMode symbolicLinkMode +#endif + +{- Checks if a file has any executable bits set. -} +isExecutable :: FileMode -> Bool +isExecutable mode = combineModes executeModes `intersectFileModes` mode /= 0 + +{- Runs an action without that pesky umask influencing it, unless the + - passed FileMode is the standard one. -} +noUmask :: FileMode -> IO a -> IO a +#ifndef mingw32_HOST_OS +noUmask mode a + | mode == stdFileMode = a + | otherwise = withUmask nullFileMode a +#else +noUmask _ a = a +#endif + +withUmask :: FileMode -> IO a -> IO a +#ifndef mingw32_HOST_OS +withUmask umask a = bracket setup cleanup go + where + setup = setFileCreationMask umask + cleanup = setFileCreationMask + go _ = a +#else +withUmask _ a = a +#endif + +combineModes :: [FileMode] -> FileMode +combineModes [] = undefined +combineModes [m] = m +combineModes (m:ms) = foldl unionFileModes m ms + +isSticky :: FileMode -> Bool +#ifdef mingw32_HOST_OS +isSticky _ = False +#else +isSticky = checkMode stickyMode + +stickyMode :: FileMode +stickyMode = 512 + +setSticky :: FilePath -> IO () +setSticky f = modifyFileMode f $ addModes [stickyMode] +#endif + +{- Writes a file, ensuring that its modes do not allow it to be read + - or written by anyone other than the current user, + - before any content is written. + - + - When possible, this is done using the umask. + - + - On a filesystem that does not support file permissions, this is the same + - as writeFile. + -} +writeFileProtected :: FilePath -> String -> IO () +writeFileProtected file content = withUmask 0o0077 $ + withFile file WriteMode $ \h -> do + void $ tryIO $ modifyFileMode file $ + removeModes + [ groupReadMode, otherReadMode + , groupWriteMode, otherWriteMode + ] + hPutStr h content diff --git a/Utility/FileSystemEncoding.hs b/Utility/FileSystemEncoding.hs new file mode 100644 --- /dev/null +++ b/Utility/FileSystemEncoding.hs @@ -0,0 +1,132 @@ +{- GHC File system encoding handling. + - + - Copyright 2012-2014 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP #-} + +module Utility.FileSystemEncoding ( + fileEncoding, + withFilePath, + md5FilePath, + decodeBS, + decodeW8, + encodeW8, + truncateFilePath, +) where + +import qualified GHC.Foreign as GHC +import qualified GHC.IO.Encoding as Encoding +import Foreign.C +import System.IO +import System.IO.Unsafe +import qualified Data.Hash.MD5 as MD5 +import Data.Word +import Data.Bits.Utils +import qualified Data.ByteString.Lazy as L +#ifdef mingw32_HOST_OS +import qualified Data.ByteString.Lazy.UTF8 as L8 +#endif + +{- Sets a Handle to use the filesystem encoding. This causes data + - written or read from it to be encoded/decoded the same + - as ghc 7.4 does to filenames etc. This special encoding + - allows "arbitrary undecodable bytes to be round-tripped through it". + -} +fileEncoding :: Handle -> IO () +#ifndef mingw32_HOST_OS +fileEncoding h = hSetEncoding h =<< Encoding.getFileSystemEncoding +#else +{- The file system encoding does not work well on Windows, + - and Windows only has utf FilePaths anyway. -} +fileEncoding h = hSetEncoding h Encoding.utf8 +#endif + +{- Marshal a Haskell FilePath into a NUL terminated C string using temporary + - storage. The FilePath is encoded using the filesystem encoding, + - reversing the decoding that should have been done when the FilePath + - was obtained. -} +withFilePath :: FilePath -> (CString -> IO a) -> IO a +withFilePath fp f = Encoding.getFileSystemEncoding + >>= \enc -> GHC.withCString enc fp f + +{- Encodes a FilePath into a String, applying the filesystem encoding. + - + - There are very few things it makes sense to do with such an encoded + - string. It's not a legal filename; it should not be displayed. + - So this function is not exported, but instead used by the few functions + - that can usefully consume it. + - + - This use of unsafePerformIO is belived to be safe; GHC's interface + - only allows doing this conversion with CStrings, and the CString buffer + - is allocated, used, and deallocated within the call, with no side + - effects. + -} +{-# NOINLINE _encodeFilePath #-} +_encodeFilePath :: FilePath -> String +_encodeFilePath fp = unsafePerformIO $ do + enc <- Encoding.getFileSystemEncoding + GHC.withCString enc fp $ GHC.peekCString Encoding.char8 + +{- Encodes a FilePath into a Md5.Str, applying the filesystem encoding. -} +md5FilePath :: FilePath -> MD5.Str +md5FilePath = MD5.Str . _encodeFilePath + +{- Decodes a ByteString into a FilePath, applying the filesystem encoding. -} +decodeBS :: L.ByteString -> FilePath +#ifndef mingw32_HOST_OS +decodeBS = encodeW8 . L.unpack +#else +{- On Windows, we assume that the ByteString is utf-8, since Windows + - only uses unicode for filenames. -} +decodeBS = L8.toString +#endif + +{- Converts a [Word8] to a FilePath, encoding using the filesystem encoding. + - + - w82c produces a String, which may contain Chars that are invalid + - unicode. From there, this is really a simple matter of applying the + - file system encoding, only complicated by GHC's interface to doing so. + -} +{-# NOINLINE encodeW8 #-} +encodeW8 :: [Word8] -> FilePath +encodeW8 w8 = unsafePerformIO $ do + enc <- Encoding.getFileSystemEncoding + GHC.withCString Encoding.char8 (w82s w8) $ GHC.peekCString enc + +{- Useful when you want the actual number of bytes that will be used to + - represent the FilePath on disk. -} +decodeW8 :: FilePath -> [Word8] +decodeW8 = s2w8 . _encodeFilePath + +{- Truncates a FilePath to the given number of bytes (or less), + - as represented on disk. + - + - Avoids returning an invalid part of a unicode byte sequence, at the + - cost of efficiency when running on a large FilePath. + -} +truncateFilePath :: Int -> FilePath -> FilePath +#ifndef mingw32_HOST_OS +truncateFilePath n = go . reverse + where + go f = + let bytes = decodeW8 f + in if length bytes <= n + then reverse f + else go (drop 1 f) +#else +{- On Windows, count the number of bytes used by each utf8 character. -} +truncateFilePath n = reverse . go [] n . L8.fromString + where + go coll cnt bs + | cnt <= 0 = coll + | otherwise = case L8.decode bs of + Just (c, x) | c /= L8.replacement_char -> + let x' = fromIntegral x + in if cnt - x' < 0 + then coll + else go (c:coll) (cnt - x') (L8.drop 1 bs) + _ -> coll +#endif diff --git a/Utility/Misc.hs b/Utility/Misc.hs new file mode 100644 --- /dev/null +++ b/Utility/Misc.hs @@ -0,0 +1,148 @@ +{- misc utility functions + - + - Copyright 2010-2011 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP #-} + +module Utility.Misc where + +import System.IO +import Control.Monad +import Foreign +import Data.Char +import Data.List +import Control.Applicative +import System.Exit +#ifndef mingw32_HOST_OS +import System.Posix.Process (getAnyProcessStatus) +import Utility.Exception +#endif + +import Utility.FileSystemEncoding +import Utility.Monad + +{- A version of hgetContents that is not lazy. Ensures file is + - all read before it gets closed. -} +hGetContentsStrict :: Handle -> IO String +hGetContentsStrict = hGetContents >=> \s -> length s `seq` return s + +{- A version of readFile that is not lazy. -} +readFileStrict :: FilePath -> IO String +readFileStrict = readFile >=> \s -> length s `seq` return s + +{- Reads a file strictly, and using the FileSystemEncoding, so it will + - never crash on a badly encoded file. -} +readFileStrictAnyEncoding :: FilePath -> IO String +readFileStrictAnyEncoding f = withFile f ReadMode $ \h -> do + fileEncoding h + hClose h `after` hGetContentsStrict h + +{- Writes a file, using the FileSystemEncoding so it will never crash + - on a badly encoded content string. -} +writeFileAnyEncoding :: FilePath -> String -> IO () +writeFileAnyEncoding f content = withFile f WriteMode $ \h -> do + fileEncoding h + hPutStr h content + +{- Like break, but the item matching the condition is not included + - in the second result list. + - + - separate (== ':') "foo:bar" = ("foo", "bar") + - separate (== ':') "foobar" = ("foobar", "") + -} +separate :: (a -> Bool) -> [a] -> ([a], [a]) +separate c l = unbreak $ break c l + where + unbreak r@(a, b) + | null b = r + | otherwise = (a, tail b) + +{- Breaks out the first line. -} +firstLine :: String -> String +firstLine = takeWhile (/= '\n') + +{- Splits a list into segments that are delimited by items matching + - a predicate. (The delimiters are not included in the segments.) + - Segments may be empty. -} +segment :: (a -> Bool) -> [a] -> [[a]] +segment p l = map reverse $ go [] [] l + where + go c r [] = reverse $ c:r + go c r (i:is) + | p i = go [] (c:r) is + | otherwise = go (i:c) r is + +prop_segment_regressionTest :: Bool +prop_segment_regressionTest = all id + -- Even an empty list is a segment. + [ segment (== "--") [] == [[]] + -- There are two segements in this list, even though the first is empty. + , segment (== "--") ["--", "foo", "bar"] == [[],["foo","bar"]] + ] + +{- Includes the delimiters as segments of their own. -} +segmentDelim :: (a -> Bool) -> [a] -> [[a]] +segmentDelim p l = map reverse $ go [] [] l + where + go c r [] = reverse $ c:r + go c r (i:is) + | p i = go [] ([i]:c:r) is + | otherwise = go (i:c) r is + +{- Replaces multiple values in a string. + - + - Takes care to skip over just-replaced values, so that they are not + - mangled. For example, massReplace [("foo", "new foo")] does not + - replace the "new foo" with "new new foo". + -} +massReplace :: [(String, String)] -> String -> String +massReplace vs = go [] vs + where + + go acc _ [] = concat $ reverse acc + go acc [] (c:cs) = go ([c]:acc) vs cs + go acc ((val, replacement):rest) s + | val `isPrefixOf` s = + go (replacement:acc) vs (drop (length val) s) + | otherwise = go acc rest s + +{- Wrapper around hGetBufSome that returns a String. + - + - The null string is returned on eof, otherwise returns whatever + - data is currently available to read from the handle, or waits for + - data to be written to it if none is currently available. + - + - Note on encodings: The normal encoding of the Handle is ignored; + - each byte is converted to a Char. Not unicode clean! + -} +hGetSomeString :: Handle -> Int -> IO String +hGetSomeString h sz = do + fp <- mallocForeignPtrBytes sz + len <- withForeignPtr fp $ \buf -> hGetBufSome h buf sz + map (chr . fromIntegral) <$> withForeignPtr fp (peekbytes len) + where + peekbytes :: Int -> Ptr Word8 -> IO [Word8] + peekbytes len buf = mapM (peekElemOff buf) [0..pred len] + +{- Reaps any zombie git processes. + - + - Warning: Not thread safe. Anything that was expecting to wait + - on a process and get back an exit status is going to be confused + - if this reap gets there first. -} +reapZombies :: IO () +#ifndef mingw32_HOST_OS +reapZombies = do + -- throws an exception when there are no child processes + catchDefaultIO Nothing (getAnyProcessStatus False True) + >>= maybe (return ()) (const reapZombies) + +#else +reapZombies = return () +#endif + +exitBool :: Bool -> IO a +exitBool False = exitFailure +exitBool True = exitSuccess diff --git a/Utility/Monad.hs b/Utility/Monad.hs new file mode 100644 --- /dev/null +++ b/Utility/Monad.hs @@ -0,0 +1,69 @@ +{- monadic stuff + - + - Copyright 2010-2012 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +module Utility.Monad where + +import Data.Maybe +import Control.Monad + +{- Return the first value from a list, if any, satisfying the given + - predicate -} +firstM :: Monad m => (a -> m Bool) -> [a] -> m (Maybe a) +firstM _ [] = return Nothing +firstM p (x:xs) = ifM (p x) (return $ Just x , firstM p xs) + +{- Runs the action on values from the list until it succeeds, returning + - its result. -} +getM :: Monad m => (a -> m (Maybe b)) -> [a] -> m (Maybe b) +getM _ [] = return Nothing +getM p (x:xs) = maybe (getM p xs) (return . Just) =<< p x + +{- Returns true if any value in the list satisfies the predicate, + - stopping once one is found. -} +anyM :: Monad m => (a -> m Bool) -> [a] -> m Bool +anyM p = liftM isJust . firstM p + +allM :: Monad m => (a -> m Bool) -> [a] -> m Bool +allM _ [] = return True +allM p (x:xs) = p x <&&> allM p xs + +{- Runs an action on values from a list until it succeeds. -} +untilTrue :: Monad m => [a] -> (a -> m Bool) -> m Bool +untilTrue = flip anyM + +{- if with a monadic conditional. -} +ifM :: Monad m => m Bool -> (m a, m a) -> m a +ifM cond (thenclause, elseclause) = do + c <- cond + if c then thenclause else elseclause + +{- short-circuiting monadic || -} +(<||>) :: Monad m => m Bool -> m Bool -> m Bool +ma <||> mb = ifM ma ( return True , mb ) + +{- short-circuiting monadic && -} +(<&&>) :: Monad m => m Bool -> m Bool -> m Bool +ma <&&> mb = ifM ma ( mb , return False ) + +{- Same fixity as && and || -} +infixr 3 <&&> +infixr 2 <||> + +{- Runs an action, passing its value to an observer before returning it. -} +observe :: Monad m => (a -> m b) -> m a -> m a +observe observer a = do + r <- a + _ <- observer r + return r + +{- b `after` a runs first a, then b, and returns the value of a -} +after :: Monad m => m b -> m a -> m a +after = observe . const + +{- do nothing -} +noop :: Monad m => m () +noop = return () diff --git a/Utility/PartialPrelude.hs b/Utility/PartialPrelude.hs new file mode 100644 --- /dev/null +++ b/Utility/PartialPrelude.hs @@ -0,0 +1,68 @@ +{- Parts of the Prelude are partial functions, which are a common source of + - bugs. + - + - This exports functions that conflict with the prelude, which avoids + - them being accidentially used. + -} + +module Utility.PartialPrelude where + +import qualified Data.Maybe + +{- read should be avoided, as it throws an error + - Instead, use: readish -} +read :: Read a => String -> a +read = Prelude.read + +{- head is a partial function; head [] is an error + - Instead, use: take 1 or headMaybe -} +head :: [a] -> a +head = Prelude.head + +{- tail is also partial + - Instead, use: drop 1 -} +tail :: [a] -> [a] +tail = Prelude.tail + +{- init too + - Instead, use: beginning -} +init :: [a] -> [a] +init = Prelude.init + +{- last too + - Instead, use: end or lastMaybe -} +last :: [a] -> a +last = Prelude.last + +{- Attempts to read a value from a String. + - + - Ignores leading/trailing whitespace, and throws away any trailing + - text after the part that can be read. + - + - readMaybe is available in Text.Read in new versions of GHC, + - but that one requires the entire string to be consumed. + -} +readish :: Read a => String -> Maybe a +readish s = case reads s of + ((x,_):_) -> Just x + _ -> Nothing + +{- Like head but Nothing on empty list. -} +headMaybe :: [a] -> Maybe a +headMaybe = Data.Maybe.listToMaybe + +{- Like last but Nothing on empty list. -} +lastMaybe :: [a] -> Maybe a +lastMaybe [] = Nothing +lastMaybe v = Just $ Prelude.last v + +{- All but the last element of a list. + - (Like init, but no error on an empty list.) -} +beginning :: [a] -> [a] +beginning [] = [] +beginning l = Prelude.init l + +{- Like last, but no error on an empty list. -} +end :: [a] -> [a] +end [] = [] +end l = [Prelude.last l] diff --git a/Utility/PosixFiles.hs b/Utility/PosixFiles.hs new file mode 100644 --- /dev/null +++ b/Utility/PosixFiles.hs @@ -0,0 +1,33 @@ +{- POSIX files (and compatablity wrappers). + - + - This is like System.PosixCompat.Files, except with a fixed rename. + - + - Copyright 2014 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP #-} + +module Utility.PosixFiles ( + module X, + rename +) where + +import System.PosixCompat.Files as X hiding (rename) + +#ifndef mingw32_HOST_OS +import System.Posix.Files (rename) +#else +import qualified System.Win32.File as Win32 +#endif + +{- System.PosixCompat.Files.rename on Windows calls renameFile, + - so cannot rename directories. + - + - Instead, use Win32 moveFile, which can. It needs to be told to overwrite + - any existing file. -} +#ifdef mingw32_HOST_OS +rename :: FilePath -> FilePath -> IO () +rename src dest = Win32.moveFileEx src dest Win32.mOVEFILE_REPLACE_EXISTING +#endif diff --git a/Utility/Process.hs b/Utility/Process.hs new file mode 100644 --- /dev/null +++ b/Utility/Process.hs @@ -0,0 +1,360 @@ +{- System.Process enhancements, including additional ways of running + - processes, and logging. + - + - Copyright 2012 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP, Rank2Types #-} + +module Utility.Process ( + module X, + CreateProcess, + StdHandle(..), + readProcess, + readProcessEnv, + writeReadProcessEnv, + forceSuccessProcess, + checkSuccessProcess, + ignoreFailureProcess, + createProcessSuccess, + createProcessChecked, + createBackgroundProcess, + processTranscript, + processTranscript', + withHandle, + withBothHandles, + withQuietOutput, + createProcess, + startInteractiveProcess, + stdinHandle, + stdoutHandle, + stderrHandle, + devNull, +) where + +import qualified System.Process +import System.Process as X hiding (CreateProcess(..), createProcess, runInteractiveProcess, readProcess, readProcessWithExitCode, system, rawSystem, runInteractiveCommand, runProcess) +import System.Process hiding (createProcess, readProcess) +import System.Exit +import System.IO +import System.Log.Logger +import Control.Concurrent +import qualified Control.Exception as E +import Control.Monad +#ifndef mingw32_HOST_OS +import System.Posix.IO +#else +import Control.Applicative +#endif +import Data.Maybe + +import Utility.Misc +import Utility.Exception + +type CreateProcessRunner = forall a. CreateProcess -> ((Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) -> IO a) -> IO a + +data StdHandle = StdinHandle | StdoutHandle | StderrHandle + deriving (Eq) + +{- Normally, when reading from a process, it does not need to be fed any + - standard input. -} +readProcess :: FilePath -> [String] -> IO String +readProcess cmd args = readProcessEnv cmd args Nothing + +readProcessEnv :: FilePath -> [String] -> Maybe [(String, String)] -> IO String +readProcessEnv cmd args environ = + withHandle StdoutHandle createProcessSuccess p $ \h -> do + output <- hGetContentsStrict h + hClose h + return output + where + p = (proc cmd args) + { std_out = CreatePipe + , env = environ + } + +{- Runs an action to write to a process on its stdin, + - returns its output, and also allows specifying the environment. + -} +writeReadProcessEnv + :: FilePath + -> [String] + -> Maybe [(String, String)] + -> (Maybe (Handle -> IO ())) + -> (Maybe (Handle -> IO ())) + -> IO String +writeReadProcessEnv cmd args environ writestdin adjusthandle = do + (Just inh, Just outh, _, pid) <- createProcess p + + maybe (return ()) (\a -> a inh) adjusthandle + maybe (return ()) (\a -> a outh) adjusthandle + + -- fork off a thread to start consuming the output + output <- hGetContents outh + outMVar <- newEmptyMVar + _ <- forkIO $ E.evaluate (length output) >> putMVar outMVar () + + -- now write and flush any input + maybe (return ()) (\a -> a inh >> hFlush inh) writestdin + hClose inh -- done with stdin + + -- wait on the output + takeMVar outMVar + hClose outh + + -- wait on the process + forceSuccessProcess p pid + + return output + + where + p = (proc cmd args) + { std_in = CreatePipe + , std_out = CreatePipe + , std_err = Inherit + , env = environ + } + +{- Waits for a ProcessHandle, and throws an IOError if the process + - did not exit successfully. -} +forceSuccessProcess :: CreateProcess -> ProcessHandle -> IO () +forceSuccessProcess p pid = do + code <- waitForProcess pid + case code of + ExitSuccess -> return () + ExitFailure n -> fail $ showCmd p ++ " exited " ++ show n + +{- Waits for a ProcessHandle and returns True if it exited successfully. + - Note that using this with createProcessChecked will throw away + - the Bool, and is only useful to ignore the exit code of a process, + - while still waiting for it. -} +checkSuccessProcess :: ProcessHandle -> IO Bool +checkSuccessProcess pid = do + code <- waitForProcess pid + return $ code == ExitSuccess + +ignoreFailureProcess :: ProcessHandle -> IO Bool +ignoreFailureProcess pid = do + void $ waitForProcess pid + return True + +{- Runs createProcess, then an action on its handles, and then + - forceSuccessProcess. -} +createProcessSuccess :: CreateProcessRunner +createProcessSuccess p a = createProcessChecked (forceSuccessProcess p) p a + +{- Runs createProcess, then an action on its handles, and then + - a checker action on its exit code, which must wait for the process. -} +createProcessChecked :: (ProcessHandle -> IO b) -> CreateProcessRunner +createProcessChecked checker p a = do + t@(_, _, _, pid) <- createProcess p + r <- tryNonAsync $ a t + _ <- checker pid + either E.throw return r + +{- Leaves the process running, suitable for lazy streaming. + - Note: Zombies will result, and must be waited on. -} +createBackgroundProcess :: CreateProcessRunner +createBackgroundProcess p a = a =<< createProcess p + +{- Runs a process, optionally feeding it some input, and + - returns a transcript combining its stdout and stderr, and + - whether it succeeded or failed. -} +processTranscript :: String -> [String] -> (Maybe String) -> IO (String, Bool) +processTranscript cmd opts input = processTranscript' cmd opts Nothing input + +processTranscript' :: String -> [String] -> Maybe [(String, String)] -> (Maybe String) -> IO (String, Bool) +#ifndef mingw32_HOST_OS +{- This implementation interleves stdout and stderr in exactly the order + - the process writes them. -} +processTranscript' cmd opts environ input = do + (readf, writef) <- createPipe + readh <- fdToHandle readf + writeh <- fdToHandle writef + p@(_, _, _, pid) <- createProcess $ + (proc cmd opts) + { std_in = if isJust input then CreatePipe else Inherit + , std_out = UseHandle writeh + , std_err = UseHandle writeh + , env = environ + } + hClose writeh + + get <- mkreader readh + + -- now write and flush any input + case input of + Just s -> do + let inh = stdinHandle p + unless (null s) $ do + hPutStr inh s + hFlush inh + hClose inh + Nothing -> return () + + transcript <- get + + ok <- checkSuccessProcess pid + return (transcript, ok) +#else +{- This implementation for Windows puts stderr after stdout. -} +processTranscript' cmd opts environ input = do + p@(_, _, _, pid) <- createProcess $ + (proc cmd opts) + { std_in = if isJust input then CreatePipe else Inherit + , std_out = CreatePipe + , std_err = CreatePipe + , env = environ + } + + getout <- mkreader (stdoutHandle p) + geterr <- mkreader (stderrHandle p) + + case input of + Just s -> do + let inh = stdinHandle p + unless (null s) $ do + hPutStr inh s + hFlush inh + hClose inh + Nothing -> return () + + transcript <- (++) <$> getout <*> geterr + ok <- checkSuccessProcess pid + return (transcript, ok) +#endif + where + mkreader h = do + s <- hGetContents h + v <- newEmptyMVar + void $ forkIO $ do + void $ E.evaluate (length s) + putMVar v () + return $ do + takeMVar v + return s + +{- Runs a CreateProcessRunner, on a CreateProcess structure, that + - is adjusted to pipe only from/to a single StdHandle, and passes + - the resulting Handle to an action. -} +withHandle + :: StdHandle + -> CreateProcessRunner + -> CreateProcess + -> (Handle -> IO a) + -> IO a +withHandle h creator p a = creator p' $ a . select + where + base = p + { std_in = Inherit + , std_out = Inherit + , std_err = Inherit + } + (select, p') + | h == StdinHandle = + (stdinHandle, base { std_in = CreatePipe }) + | h == StdoutHandle = + (stdoutHandle, base { std_out = CreatePipe }) + | h == StderrHandle = + (stderrHandle, base { std_err = CreatePipe }) + +{- Like withHandle, but passes (stdin, stdout) handles to the action. -} +withBothHandles + :: CreateProcessRunner + -> CreateProcess + -> ((Handle, Handle) -> IO a) + -> IO a +withBothHandles creator p a = creator p' $ a . bothHandles + where + p' = p + { std_in = CreatePipe + , std_out = CreatePipe + , std_err = Inherit + } + +{- Forces the CreateProcessRunner to run quietly; + - both stdout and stderr are discarded. -} +withQuietOutput + :: CreateProcessRunner + -> CreateProcess + -> IO () +withQuietOutput creator p = withFile devNull WriteMode $ \nullh -> do + let p' = p + { std_out = UseHandle nullh + , std_err = UseHandle nullh + } + creator p' $ const $ return () + +devNull :: FilePath +#ifndef mingw32_HOST_OS +devNull = "/dev/null" +#else +devNull = "NUL" +#endif + +{- Extract a desired handle from createProcess's tuple. + - These partial functions are safe as long as createProcess is run + - with appropriate parameters to set up the desired handle. + - Get it wrong and the runtime crash will always happen, so should be + - easily noticed. -} +type HandleExtractor = (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) -> Handle +stdinHandle :: HandleExtractor +stdinHandle (Just h, _, _, _) = h +stdinHandle _ = error "expected stdinHandle" +stdoutHandle :: HandleExtractor +stdoutHandle (_, Just h, _, _) = h +stdoutHandle _ = error "expected stdoutHandle" +stderrHandle :: HandleExtractor +stderrHandle (_, _, Just h, _) = h +stderrHandle _ = error "expected stderrHandle" +bothHandles :: (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) -> (Handle, Handle) +bothHandles (Just hin, Just hout, _, _) = (hin, hout) +bothHandles _ = error "expected bothHandles" + +{- Debugging trace for a CreateProcess. -} +debugProcess :: CreateProcess -> IO () +debugProcess p = do + debugM "Utility.Process" $ unwords + [ action ++ ":" + , showCmd p + ] + where + action + | piped (std_in p) && piped (std_out p) = "chat" + | piped (std_in p) = "feed" + | piped (std_out p) = "read" + | otherwise = "call" + piped Inherit = False + piped _ = True + +{- Shows the command that a CreateProcess will run. -} +showCmd :: CreateProcess -> String +showCmd = go . cmdspec + where + go (ShellCommand s) = s + go (RawCommand c ps) = c ++ " " ++ show ps + +{- Starts an interactive process. Unlike runInteractiveProcess in + - System.Process, stderr is inherited. -} +startInteractiveProcess + :: FilePath + -> [String] + -> Maybe [(String, String)] + -> IO (ProcessHandle, Handle, Handle) +startInteractiveProcess cmd args environ = do + let p = (proc cmd args) + { std_in = CreatePipe + , std_out = CreatePipe + , std_err = Inherit + , env = environ + } + (Just from, Just to, _, pid) <- createProcess p + return (pid, to, from) + +{- Wrapper around System.Process function that does debug logging. -} +createProcess :: CreateProcess -> IO (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) +createProcess p = do + debugProcess p + System.Process.createProcess p diff --git a/Utility/SafeCommand.hs b/Utility/SafeCommand.hs new file mode 100644 --- /dev/null +++ b/Utility/SafeCommand.hs @@ -0,0 +1,120 @@ +{- safely running shell commands + - + - Copyright 2010-2013 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +module Utility.SafeCommand where + +import System.Exit +import Utility.Process +import System.Process (env) +import Data.String.Utils +import Control.Applicative +import System.FilePath +import Data.Char + +{- A type for parameters passed to a shell command. A command can + - be passed either some Params (multiple parameters can be included, + - whitespace-separated, or a single Param (for when parameters contain + - whitespace), or a File. + -} +data CommandParam = Params String | Param String | File FilePath + deriving (Eq, Show, Ord) + +{- Used to pass a list of CommandParams to a function that runs + - a command and expects Strings. -} +toCommand :: [CommandParam] -> [String] +toCommand = concatMap unwrap + where + unwrap (Param s) = [s] + unwrap (Params s) = filter (not . null) (split " " s) + -- Files that start with a non-alphanumeric that is not a path + -- separator are modified to avoid the command interpreting them as + -- options or other special constructs. + unwrap (File s@(h:_)) + | isAlphaNum h || h `elem` pathseps = [s] + | otherwise = ["./" ++ s] + unwrap (File s) = [s] + -- '/' is explicitly included because it's an alternative + -- path separator on Windows. + pathseps = pathSeparator:"./" + +{- Run a system command, and returns True or False + - if it succeeded or failed. + -} +boolSystem :: FilePath -> [CommandParam] -> IO Bool +boolSystem command params = boolSystemEnv command params Nothing + +boolSystemEnv :: FilePath -> [CommandParam] -> Maybe [(String, String)] -> IO Bool +boolSystemEnv command params environ = dispatch <$> safeSystemEnv command params environ + where + dispatch ExitSuccess = True + dispatch _ = False + +{- Runs a system command, returning the exit status. -} +safeSystem :: FilePath -> [CommandParam] -> IO ExitCode +safeSystem command params = safeSystemEnv command params Nothing + +safeSystemEnv :: FilePath -> [CommandParam] -> Maybe [(String, String)] -> IO ExitCode +safeSystemEnv command params environ = do + (_, _, _, pid) <- createProcess (proc command $ toCommand params) + { env = environ } + waitForProcess pid + +{- Wraps a shell command line inside sh -c, allowing it to be run in a + - login shell that may not support POSIX shell, eg csh. -} +shellWrap :: String -> String +shellWrap cmdline = "sh -c " ++ shellEscape cmdline + +{- Escapes a filename or other parameter to be safely able to be exposed to + - the shell. + - + - This method works for POSIX shells, as well as other shells like csh. + -} +shellEscape :: String -> String +shellEscape f = "'" ++ escaped ++ "'" + where + -- replace ' with '"'"' + escaped = join "'\"'\"'" $ split "'" f + +{- Unescapes a set of shellEscaped words or filenames. -} +shellUnEscape :: String -> [String] +shellUnEscape [] = [] +shellUnEscape s = word : shellUnEscape rest + where + (word, rest) = findword "" s + findword w [] = (w, "") + findword w (c:cs) + | c == ' ' = (w, cs) + | c == '\'' = inquote c w cs + | c == '"' = inquote c w cs + | otherwise = findword (w++[c]) cs + inquote _ w [] = (w, "") + inquote q w (c:cs) + | c == q = findword w cs + | otherwise = inquote q (w++[c]) cs + +{- For quickcheck. -} +prop_idempotent_shellEscape :: String -> Bool +prop_idempotent_shellEscape s = [s] == (shellUnEscape . shellEscape) s +prop_idempotent_shellEscape_multiword :: [String] -> Bool +prop_idempotent_shellEscape_multiword s = s == (shellUnEscape . unwords . map shellEscape) s + +{- Segements a list of filenames into groups that are all below the manximum + - command-line length limit. Does not preserve order. -} +segmentXargs :: [FilePath] -> [[FilePath]] +segmentXargs l = go l [] 0 [] + where + go [] c _ r = c:r + go (f:fs) c accumlen r + | len < maxlen && newlen > maxlen = go (f:fs) [] 0 (c:r) + | otherwise = go fs (f:c) newlen r + where + len = length f + newlen = accumlen + len + + {- 10k of filenames per command, well under Linux's 20k limit; + - allows room for other parameters etc. -} + maxlen = 10240 diff --git a/Utility/Tmp.hs b/Utility/Tmp.hs new file mode 100644 --- /dev/null +++ b/Utility/Tmp.hs @@ -0,0 +1,100 @@ +{- Temporary files and directories. + - + - Copyright 2010-2013 Joey Hess + - + - Licensed under the GNU GPL version 3 or higher. + -} + +{-# LANGUAGE CPP #-} + +module Utility.Tmp where + +import Control.Exception (bracket) +import System.IO +import System.Directory +import Control.Monad.IfElse +import System.FilePath + +import Utility.Exception +import Utility.FileSystemEncoding +import Utility.PosixFiles + +type Template = String + +{- Runs an action like writeFile, writing to a temp file first and + - then moving it into place. The temp file is stored in the same + - directory as the final file to avoid cross-device renames. -} +viaTmp :: (FilePath -> String -> IO ()) -> FilePath -> String -> IO () +viaTmp a file content = do + let (dir, base) = splitFileName file + createDirectoryIfMissing True dir + (tmpfile, handle) <- openTempFile dir (base ++ ".tmp") + hClose handle + a tmpfile content + rename tmpfile file + +{- Runs an action with a tmp file located in the system's tmp directory + - (or in "." if there is none) then removes the file. -} +withTmpFile :: Template -> (FilePath -> Handle -> IO a) -> IO a +withTmpFile template a = do + tmpdir <- catchDefaultIO "." getTemporaryDirectory + withTmpFileIn tmpdir template a + +{- Runs an action with a tmp file located in the specified directory, + - then removes the file. -} +withTmpFileIn :: FilePath -> Template -> (FilePath -> Handle -> IO a) -> IO a +withTmpFileIn tmpdir template a = bracket create remove use + where + create = openTempFile tmpdir template + remove (name, handle) = do + hClose handle + catchBoolIO (removeFile name >> return True) + use (name, handle) = a name handle + +{- Runs an action with a tmp directory located within the system's tmp + - directory (or within "." if there is none), then removes the tmp + - directory and all its contents. -} +withTmpDir :: Template -> (FilePath -> IO a) -> IO a +withTmpDir template a = do + tmpdir <- catchDefaultIO "." getTemporaryDirectory + withTmpDirIn tmpdir template a + +{- Runs an action with a tmp directory located within a specified directory, + - then removes the tmp directory and all its contents. -} +withTmpDirIn :: FilePath -> Template -> (FilePath -> IO a) -> IO a +withTmpDirIn tmpdir template = bracket create remove + where + remove d = whenM (doesDirectoryExist d) $ do +#if mingw32_HOST_OS + -- Windows will often refuse to delete a file + -- after a process has just written to it and exited. + -- Because it's crap, presumably. So, ignore failure + -- to delete the temp directory. + _ <- tryIO $ removeDirectoryRecursive d + return () +#else + removeDirectoryRecursive d +#endif + create = do + createDirectoryIfMissing True tmpdir + makenewdir (tmpdir template) (0 :: Int) + makenewdir t n = do + let dir = t ++ "." ++ show n + either (const $ makenewdir t $ n + 1) (const $ return dir) + =<< tryIO (createDirectory dir) + +{- It's not safe to use a FilePath of an existing file as the template + - for openTempFile, because if the FilePath is really long, the tmpfile + - will be longer, and may exceed the maximum filename length. + - + - This generates a template that is never too long. + - (Well, it allocates 20 characters for use in making a unique temp file, + - anyway, which is enough for the current implementation and any + - likely implementation.) + -} +relatedTemplate :: FilePath -> FilePath +relatedTemplate f + | len > 20 = truncateFilePath (len - 20) f + | otherwise = f + where + len = length f diff --git a/config.hs b/config.hs new file mode 100644 --- /dev/null +++ b/config.hs @@ -0,0 +1,83 @@ +{- This is the main configuration file for Propellor, and is used to build + - the propellor program. -} + +import Propellor +import Propellor.CmdLine +import qualified Propellor.Property.File as File +import qualified Propellor.Property.Apt as Apt +import qualified Propellor.Property.Network as Network +import qualified Propellor.Property.Ssh as Ssh +import qualified Propellor.Property.Sudo as Sudo +import qualified Propellor.Property.User as User +import qualified Propellor.Property.Hostname as Hostname +import qualified Propellor.Property.Reboot as Reboot +import qualified Propellor.Property.Tor as Tor +import qualified Propellor.Property.Docker as Docker +import qualified Propellor.Property.GitHome as GitHome +import qualified Propellor.Property.JoeySites as JoeySites + +main :: IO () +main = defaultMain getProperties + +{- | This is where the system's HostName, either as returned by uname + - or one specified on the command line, is converted into a list of + - Properties for that system. + - + - Edit this to configure propellor! + -} +getProperties :: HostName -> Maybe [Property] +getProperties hostname@"clam.kitenet.net" = Just + [ cleanCloudAtCost hostname + , standardSystem Apt.Unstable + , Network.ipv6to4 + -- Clam is a tor bridge, and an olduse.net shellbox. + , Tor.isBridge + , JoeySites.oldUseNetshellBox + -- I play with docker on clam. + , Docker.configured + -- This is not an important system so I don't want to need to + -- manually upgrade it. + , Apt.unattendedUpgrades True + -- Should come last as it reboots. + , Apt.installed ["systemd-sysv"] `onChange` Reboot.now + ] +-- add more hosts here... +--getProperties "foo" = +getProperties _ = Nothing + +-- This is my standard system setup +standardSystem :: Apt.Suite -> Property +standardSystem suite = propertyList "standard system" + [ Apt.stdSourcesList suite `onChange` Apt.upgrade + , Apt.installed ["etckeeper"] + , Apt.installed ["ssh"] + , GitHome.installedFor "root" + , User.hasSomePassword "root" + -- Harden the system, but only once root's authorized_keys + -- is safely in place. + , check (Ssh.hasAuthorizedKeys "root") $ + Ssh.passwordAuthentication False + , User.sshAccountFor "joey" + , User.hasSomePassword "joey" + , Sudo.enabledFor "joey" + , GitHome.installedFor "joey" + , Apt.installed ["vim", "screen"] + -- I use postfix, or no MTA. + , Apt.removed ["exim4"] `onChange` Apt.autoRemove + ] + +-- Clean up a system as installed by cloudatcost.com +cleanCloudAtCost :: HostName -> Property +cleanCloudAtCost hostname = propertyList "cloudatcost cleanup" + [ Hostname.set hostname + , Ssh.uniqueHostKeys + , "worked around grub/lvm boot bug #743126" ==> + "/etc/default/grub" `File.containsLine` "GRUB_DISABLE_LINUX_UUID=true" + `onChange` cmdProperty "update-grub" [] + `onChange` cmdProperty "update-initramfs" ["-u"] + , "nuked cloudatcost cruft" ==> combineProperties + [ File.notPresent "/etc/rc.local" + , File.notPresent "/etc/init.d/S97-setup.sh" + , User.nuked "user" User.YesReallyDeleteHome + ] + ] diff --git a/propellor.cabal b/propellor.cabal new file mode 100644 --- /dev/null +++ b/propellor.cabal @@ -0,0 +1,82 @@ +Name: propellor +Version: 0.1 +Cabal-Version: >= 1.6 +License: GPL +Maintainer: Joey Hess +Author: Joey Hess +Stability: Stable +Copyright: 2014 Joey Hess +License-File: GPL +Build-Type: Simple +Homepage: http://joeyh.name/code/propellor/ +Category: Utility +Extra-Source-Files: + README + TODO + Makefile +Synopsis: property-based host configuration management in haskell +Description: + Propellor enures that the system it's run in satisfies a list of + properties, taking action as necessary when a property is not yet met. + . + While Propellor can be installed from hackage, to customize and use it + you should fork its git repository and modify it from there: + git clone git://git.kitenet.net/propellor + +Executable propellor + Main-Is: config.hs + GHC-Options: -Wall + Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, + IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal, + containers + + if (! os(windows)) + Build-Depends: unix + +Library + GHC-Options: -Wall + Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, + IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal, + containers + + if (! os(windows)) + Build-Depends: unix + + Exposed-Modules: + Propellor + Propellor.Property + Propellor.Property.Apt + Propellor.Property.Cmd + Propellor.Property.Docker + Propellor.Property.File + Propellor.Property.GitHome + Propellor.Property.Hostname + Propellor.Property.JoeySites + Propellor.Property.Network + Propellor.Property.Reboot + Propellor.Property.Ssh + Propellor.Property.Sudo + Propellor.Property.Tor + Propellor.Property.User + Propellor.CmdLine + Propellor.PrivData + Propellor.Types + Other-Modules: + Utility.Applicative + Utility.Data + Utility.Directory + Utility.Env + Utility.Exception + Utility.FileMode + Utility.FileSystemEncoding + Utility.Misc + Utility.Monad + Utility.PartialPrelude + Utility.PosixFiles + Utility.Process + Utility.SafeCommand + Utility.Tmp + +source-repository head + type: git + location: git://git.kitenet.net/propellor.git