module Propellor.Property.OS ( cleanInstallOnce, Confirmation(..), preserveNetworkInterfaces, preserveResolvConf, preserveRootSshAuthorized, rebootForced, oldOSRemoved, ) where import Propellor import qualified Propellor.Property.Debootstrap as Debootstrap import qualified Propellor.Property.Ssh as Ssh import qualified Propellor.Property.File as File import Propellor.Property.Mount import Propellor.Property.Chroot.Util (stdPATH) import Utility.SafeCommand import System.Posix.Files (rename, fileExist) import Control.Exception (throw) -- | Replaces whatever OS was installed before with a clean installation -- of the OS that the Host is configured to have. -- -- This can replace one Linux distribution with different one. -- But, it can also fail and leave the system in an unbootable state. -- -- To avoid this property being accidentially used, you have to provide -- a Confirmation containing the name of the host that you intend to apply -- the property to. -- -- This property only runs once. The cleanly installed system will have -- a file /etc/propellor-cleaninstall, which indicates it was cleanly -- installed. -- -- The files from the old os will be left in /old-os -- -- TODO: A forced reboot should be schedued to run after propellor finishes -- ensuring all properties of the host. -- -- You will typically want to run some more properties after the clean -- install succeeds, to bootstrap from the cleanly installed system to -- a fully working system. For example: -- -- > & os (System (Debian Unstable) "amd64") -- > & cleanInstallOnce (Confirmed "foo.example.com") -- > `onChange` propertyList "fixing up after clean install" -- > [ preserveNetworkInterfaces -- > , preserveResolvConf -- > , preserverRootSshAuthorized -- > , Apt.update -- > -- , Grub.boots "/dev/sda" -- > -- `requires` Grub.installed Grub.PC -- > -- , oldOsRemoved (Confirmed "foo.example.com") -- > ] -- > & Hostname.sane -- > & Apt.installed ["linux-image-amd64"] -- > & Apt.installed ["ssh"] -- > & User.hasSomePassword "root" -- > & User.accountFor "joey" -- > & User.hasSomePassword "joey" -- > -- rest of system properties here cleanInstallOnce :: Confirmation -> Property cleanInstallOnce confirmation = check (not <$> doesFileExist flagfile) $ go `requires` confirmed "clean install confirmed" confirmation where go = finalized `requires` propellorbootstrapped `requires` flipped `requires` osbootstrapped osbootstrapped = withOS (newOSDir ++ " bootstrapped") $ \o -> case o of (Just d@(System (Debian _) _)) -> debootstrap d (Just u@(System (Ubuntu _) _)) -> debootstrap u _ -> error "os is not declared to be Debian or Ubuntu" debootstrap targetos = ensureProperty $ toProp $ Debootstrap.built newOSDir targetos Debootstrap.DefaultConfig flipped = property (newOSDir ++ " moved into place") $ liftIO $ do -- First, unmount most mount points, lazily, so -- they don't interfere with moving things around. devfstype <- fromMaybe "devtmpfs" <$> getFsType "/dev" mnts <- filter (`notElem` ("/": trickydirs)) <$> mountPoints -- reverse so that deeper mount points come first forM_ (reverse mnts) umountLazy renamesout <- map (\d -> (d, oldOSDir ++ d, pure $ d `notElem` (oldOSDir:newOSDir:trickydirs))) <$> dirContents "/" renamesin <- map (\d -> let dest = "/" ++ takeFileName d in (d, dest, not <$> fileExist dest)) <$> dirContents newOSDir createDirectoryIfMissing True oldOSDir massRename (renamesout ++ renamesin) removeDirectoryRecursive newOSDir -- Prepare environment for running additional properties, -- overriding old OS's environment. void $ setEnv "PATH" stdPATH True void $ unsetEnv "LANG" -- Remount /dev, so that block devices etc are -- available for other properties to use. unlessM (mount devfstype devfstype "/dev") $ do warningMessage $ "failed mounting /dev using " ++ devfstype ++ "; falling back to MAKEDEV generic" void $ boolSystem "sh" [Param "-c", Param "cd /dev && /sbin/MAKEDEV generic"] -- Mount /sys too, needed by eg, grub-mkconfig. unlessM (mount "sysfs" "sysfs" "/sys") $ warningMessage "failed mounting /sys" -- And /dev/pts, used by apt. unlessM (mount "devpts" "devpts" "/dev/pts") $ warningMessage "failed mounting /dev/pts" liftIO $ writeFile flagfile "" return MadeChange propellorbootstrapped = property "propellor re-debootstrapped in new os" $ return NoChange -- re-bootstrap propellor in /usr/local/propellor, -- (using git repo bundle, privdata file, and possibly -- git repo url, which all need to be arranged to -- be present in /old-os's /usr/local/propellor) -- TODO -- Ensure that MadeChange is returned by the overall property, -- so that anything hooking in onChange will run afterwards. finalized = property "clean OS installed" $ return MadeChange flagfile = "/etc/propellor-cleaninstall" trickydirs = -- /tmp can contain X's sockets, which prevent moving it -- so it's left as-is. [ "/tmp" -- /proc is left mounted , "/proc" ] -- Performs all the renames. If any rename fails, rolls back all -- previous renames. Thus, this either successfully performs all -- the renames, or does not change the system state at all. massRename :: [(FilePath, FilePath, IO Bool)] -> IO () massRename = go [] where go _ [] = return () go undo ((from, to, test):rest) = ifM test ( tryNonAsync (rename from to) >>= either (rollback undo) (const $ go ((to, from):undo) rest) , go undo rest ) rollback undo e = do mapM_ (uncurry rename) undo throw e data Confirmation = Confirmed HostName confirmed :: Desc -> Confirmation -> Property confirmed desc (Confirmed c) = property desc $ do hostname <- asks hostName if hostname /= c then do warningMessage "Run with a bad confirmation, not matching hostname." return FailedChange else return NoChange -- | /etc/network/interfaces is configured to bring up all interfaces that -- are currently up, using the same IP addresses. preserveNetworkInterfaces :: Property preserveNetworkInterfaces = undefined -- | /etc/resolv.conf is copied the from the old OS preserveResolvConf :: Property preserveResolvConf = check (fileExist oldloc) $ property (newloc ++ " copied from old OS") $ do ls <- liftIO $ lines <$> readFile oldloc ensureProperty $ newloc `File.hasContent` ls where newloc = "/etc/resolv.conf" oldloc = oldOSDir ++ newloc -- | Root's .ssh/authorized_keys has added to it any ssh keys that -- were authorized in the old OS. Any other contents of the file are -- retained. preserveRootSshAuthorized :: Property preserveRootSshAuthorized = check (fileExist oldloc) $ property (newloc ++ " copied from old OS") $ do ks <- liftIO $ lines <$> readFile oldloc ensureProperties (map (Ssh.authorizedKey "root") ks) where newloc = "/root/.ssh/authorized_keys" oldloc = oldOSDir ++ newloc -- | Forces an immediate reboot, without contacting the init system. -- -- Can be used after cleanInstallOnce. rebootForced :: Property rebootForced = cmdProperty "reboot" [ "--force" ] -- Removes the old OS's backup from /old-os oldOSRemoved :: Confirmation -> Property oldOSRemoved confirmation = check (doesDirectoryExist oldOSDir) $ go `requires` confirmed "old OS backup removal confirmed" confirmation where go = property "old OS backup removed" $ do liftIO $ removeDirectoryRecursive oldOSDir return MadeChange oldOSDir :: FilePath oldOSDir = "/old-os" newOSDir :: FilePath newOSDir = "/new-os"