236 lines
7.7 KiB
Haskell
236 lines
7.7 KiB
Haskell
module Propellor.Property.Systemd (
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module Propellor.Property.Systemd.Core,
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started,
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stopped,
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enabled,
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disabled,
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persistentJournal,
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daemonReloaded,
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Container,
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container,
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nspawned,
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containerCfg,
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resolvConfed,
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) where
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import Propellor
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import Propellor.Types.Chroot
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import qualified Propellor.Property.Chroot as Chroot
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import qualified Propellor.Property.Apt as Apt
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import qualified Propellor.Property.File as File
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import Propellor.Property.Systemd.Core
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import Utility.SafeCommand
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import Utility.FileMode
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import Data.List
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import Data.List.Utils
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import qualified Data.Map as M
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type ServiceName = String
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type MachineName = String
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data Container = Container MachineName Chroot.Chroot Host
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deriving (Show)
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instance Hostlike Container where
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(Container n c h) & p = Container n c (h & p)
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(Container n c h) &^ p = Container n c (h &^ p)
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getHost (Container _ _ h) = h
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-- | Starts a systemd service.
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started :: ServiceName -> Property
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started n = trivial $ cmdProperty "systemctl" ["start", n]
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`describe` ("service " ++ n ++ " started")
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-- | Stops a systemd service.
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stopped :: ServiceName -> Property
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stopped n = trivial $ cmdProperty "systemctl" ["stop", n]
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`describe` ("service " ++ n ++ " stopped")
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-- | Enables a systemd service.
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enabled :: ServiceName -> Property
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enabled n = trivial $ cmdProperty "systemctl" ["enable", n]
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`describe` ("service " ++ n ++ " enabled")
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-- | Disables a systemd service.
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disabled :: ServiceName -> Property
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disabled n = trivial $ cmdProperty "systemctl" ["disable", n]
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`describe` ("service " ++ n ++ " disabled")
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-- | Enables persistent storage of the journal.
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persistentJournal :: Property
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persistentJournal = check (not <$> doesDirectoryExist dir) $
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combineProperties "persistent systemd journal"
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[ cmdProperty "install" ["-d", "-g", "systemd-journal", dir]
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, cmdProperty "setfacl" ["-R", "-nm", "g:adm:rx,d:g:adm:rx", dir]
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, started "systemd-journal-flush"
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]
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`requires` Apt.installed ["acl"]
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where
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dir = "/var/log/journal"
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-- | Causes systemd to reload its configuration files.
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daemonReloaded :: Property
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daemonReloaded = trivial $ cmdProperty "systemctl" ["daemon-reload"]
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-- | Defines a container with a given machine name.
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--
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-- Properties can be added to configure the Container.
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--
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-- > container "webserver" (Chroot.debootstrapped (System (Debian Unstable) "amd64") mempty)
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-- > & Apt.installedRunning "apache2"
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-- > & ...
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container :: MachineName -> (FilePath -> Chroot.Chroot) -> Container
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container name mkchroot = Container name c h
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& os system
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& resolvConfed
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where
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c@(Chroot.Chroot _ system _ _) = mkchroot (containerDir name)
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h = Host name [] mempty
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-- | Runs a container using systemd-nspawn.
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--
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-- A systemd unit is set up for the container, so it will automatically
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-- be started on boot.
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--
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-- Systemd is automatically installed inside the container, and will
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-- communicate with the host's systemd. This allows systemctl to be used to
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-- examine the status of services running inside the container.
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--
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-- When the host system has persistentJournal enabled, journactl can be
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-- used to examine logs forwarded from the container.
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--
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-- Reverting this property stops the container, removes the systemd unit,
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-- and deletes the chroot and all its contents.
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nspawned :: Container -> RevertableProperty
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nspawned c@(Container name (Chroot.Chroot loc system builderconf _) h) =
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RevertableProperty setup teardown
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where
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setup = combineProperties ("nspawned " ++ name) $
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map toProp steps ++ [containerprovisioned]
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teardown = combineProperties ("not nspawned " ++ name) $
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map (toProp . revert) (reverse steps)
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steps =
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[ enterScript c
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, chrootprovisioned
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, nspawnService c (_chrootCfg $ _chrootinfo $ hostInfo h)
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]
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-- Chroot provisioning is run in systemd-only mode,
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-- which sets up the chroot and ensures systemd and dbus are
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-- installed, but does not handle the other provisions.
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chrootprovisioned = Chroot.provisioned'
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(Chroot.propigateChrootInfo chroot) chroot True
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-- Use nsenter to enter container and and run propellor to
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-- finish provisioning.
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containerprovisioned = Chroot.propellChroot chroot
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(enterContainerProcess c) False
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chroot = Chroot.Chroot loc system builderconf h
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-- | Sets up the service file for the container, and then starts
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-- it running.
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nspawnService :: Container -> ChrootCfg -> RevertableProperty
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nspawnService (Container name _ _) cfg = RevertableProperty setup teardown
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where
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service = nspawnServiceName name
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servicefile = "/etc/systemd/system/multi-user.target.wants" </> service
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servicefilecontent = do
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ls <- lines <$> readFile "/lib/systemd/system/systemd-nspawn@.service"
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return $ unlines $
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"# deployed by propellor" : map addparams ls
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addparams l
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| "ExecStart=" `isPrefixOf` l =
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l ++ " " ++ unwords (nspawnServiceParams cfg)
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| otherwise = l
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goodservicefile = (==)
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<$> servicefilecontent
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<*> catchDefaultIO "" (readFile servicefile)
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writeservicefile = property servicefile $ liftIO $ do
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viaTmp writeFile servicefile =<< servicefilecontent
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return MadeChange
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setupservicefile = check (not <$> goodservicefile) $
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-- if it's running, it has the wrong configuration,
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-- so stop it
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stopped service
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`requires` daemonReloaded
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`requires` writeservicefile
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setup = started service `requires` setupservicefile
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teardown = check (doesFileExist servicefile) $
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disabled service `requires` stopped service
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nspawnServiceParams :: ChrootCfg -> [String]
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nspawnServiceParams NoChrootCfg = []
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nspawnServiceParams (SystemdNspawnCfg ps) =
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M.keys $ M.filter id $ M.fromList ps
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-- | Installs a "enter-machinename" script that root can use to run a
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-- command inside the container.
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--
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-- This uses nsenter to enter the container, by looking up the pid of the
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-- container's init process and using its namespace.
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enterScript :: Container -> RevertableProperty
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enterScript c@(Container name _ _) = RevertableProperty setup teardown
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where
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setup = combineProperties ("generated " ++ enterScriptFile c)
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[ scriptfile `File.hasContent`
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[ "#!/bin/sh"
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, "# Generated by propellor"
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, "pid=\"$(machinectl show " ++ shellEscape name ++ " -p Leader | cut -d= -f2)\" || true"
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, "if [ -n \"$pid\" ]; then"
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, "\tnsenter -p -u -n -i -m -t \"$pid\" \"$@\""
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, "else"
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, "\techo container not running >&2"
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, "\texit 1"
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, "fi"
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]
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, scriptfile `File.mode` combineModes (readModes ++ executeModes)
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]
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teardown = File.notPresent scriptfile
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scriptfile = enterScriptFile c
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enterScriptFile :: Container -> FilePath
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enterScriptFile (Container name _ _ ) = "/usr/local/bin/enter-" ++ mungename name
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enterContainerProcess :: Container -> [String] -> CreateProcess
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enterContainerProcess = proc . enterScriptFile
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nspawnServiceName :: MachineName -> ServiceName
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nspawnServiceName name = "systemd-nspawn@" ++ name ++ ".service"
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containerDir :: MachineName -> FilePath
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containerDir name = "/var/lib/container" </> mungename name
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mungename :: MachineName -> String
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mungename = replace "/" "_"
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-- | This configures how systemd-nspawn(1) starts the container,
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-- by specifying a parameter, such as "--private-network", or
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-- "--link-journal=guest"
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--
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-- When there is no leading dash, "--" is prepended to the parameter.
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--
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-- Reverting the property will remove a parameter, if it's present.
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containerCfg :: String -> RevertableProperty
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containerCfg p = RevertableProperty (mk True) (mk False)
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where
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mk b = pureInfoProperty ("container configuration " ++ (if b then "" else "without ") ++ p') $
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mempty { _chrootinfo = mempty { _chrootCfg = SystemdNspawnCfg [(p', b)] } }
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p' = case p of
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('-':_) -> p
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_ -> "--" ++ p
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-- | Bind mounts /etc/resolv.conf from the host into the container.
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--
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-- This property is enabled by default. Revert it to disable it.
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resolvConfed :: RevertableProperty
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resolvConfed = containerCfg "bind=/etc/resolv.conf"
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