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diff --git a/Propellor/Property/Cron.hs b/Propellor/Property/Cron.hs
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+module Propellor.Property.Cron where
+
+import Propellor
+import qualified Propellor.Property.File as File
+import qualified Propellor.Property.Apt as Apt
+
+type CronTimes = String
+
+-- | Installs a cron job, run as a specificed user, in a particular
+--directory. Note that the Desc must be unique, as it is used for the 
+--cron.d/ filename.
+job :: Desc -> CronTimes -> UserName -> FilePath -> String -> Property
+job desc times user cddir command = ("/etc/cron.d/" ++ desc) `File.hasContent`
+	[ "# Generated by propellor"
+	, ""
+	, "SHELL=/bin/sh"
+	, "PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin"
+	, ""
+	, times ++ "\t" ++ user ++ "\t" ++ "cd " ++ cddir ++ " && " ++ command
+	]
+	`requires` Apt.serviceInstalledRunning "cron"
+	`describe` ("cronned " ++ desc)
+
+-- | Installs a cron job, and runs it niced and ioniced.
+niceJob :: Desc -> CronTimes -> UserName -> FilePath -> String -> Property
+niceJob desc times user cddir command = job desc times user cddir
+	("nice ionice -c 3 " ++ command)
+	`requires` Apt.installed ["util-linux", "moreutils"]
+
+-- | Installs a cron job to run propellor.
+runPropellor :: CronTimes -> Property
+runPropellor times = niceJob "propellor" times "root" localdir "chronic make"