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+-- | 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.Cron as Cron
+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.Docker as Docker
+
+main :: IO ()
+main = defaultMain [host, Docker.containerProperties container]
+
+-- | 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!
+host :: HostName -> Maybe [Property]
+host hostname@"mybox.example.com" = Just
+ [ Apt.stdSourcesList Unstable
+ `onChange` Apt.upgrade
+ , Apt.unattendedUpgrades True
+ , Apt.installed ["etckeeper"]
+ , Apt.installed ["ssh"]
+ , User.hasSomePassword "root"
+ , Network.ipv6to4
+ , Docker.docked container hostname "webserver"
+ `requires` File.dirExists "/var/www"
+ , Cron.runPropellor "30 * * * *"
+ ]
+-- add more hosts here...
+--host "foo.example.com" =
+host _ = Nothing
+
+-- | This is where Docker containers are set up. A container
+-- can vary by hostname where it's used, or be the same everywhere.
+container :: HostName -> Docker.ContainerName -> Maybe (Docker.Container)
+container _ "webserver" = Just $ Docker.containerFrom "joeyh/debian-unstable"
+ (image $ System (Debian Unstable) Amd64)
+ [ Docker.publish "80:80"
+ , Docker.volume "/var/www:/var/www"
+ , Docker.inside
+ [ serviceRunning "apache2"
+ `requires` Apt.installed ["apache2"]
+ ]
+ ]
+container _ _ = Nothing