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authorJoey Hess2014-05-14 19:41:05 -0400
committerJoey Hess2014-05-14 19:41:05 -0400
commit7115d1ec162b4059b3e8e8f84bd8d5898c1db025 (patch)
tree42c1cce54e890e1d56484794ab33129132d8fee2 /src/Propellor/Property/Cron.hs
parentffe371a9d42cded461236e972a24a142419d7fc4 (diff)
moved source code to src
This is to work around OSX's brain-damange regarding filename case insensitivity. Avoided moving config.hs, because it's a config file. Put in a symlink to make build work.
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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
+import Utility.SafeCommand
+
+import Data.Char
+
+type CronTimes = String
+
+-- | Installs a cron job, run as a specified user, in a particular
+-- directory. Note that the Desc must be unique, as it is used for the
+-- cron.d/ filename.
+--
+-- Only one instance of the cron job is allowed to run at a time, no matter
+-- how long it runs. This is accomplished using flock locking of the cron
+-- job file.
+--
+-- The cron job's output will only be emailed if it exits nonzero.
+job :: Desc -> CronTimes -> UserName -> FilePath -> String -> Property
+job desc times user cddir command = cronjobfile `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"
+ ++ "chronic flock -n " ++ shellEscape cronjobfile
+ ++ " sh -c " ++ shellEscape cmdline
+ ]
+ `requires` Apt.serviceInstalledRunning "cron"
+ `requires` Apt.installed ["util-linux", "moreutils"]
+ `describe` ("cronned " ++ desc)
+ where
+ cmdline = "cd " ++ cddir ++ " && ( " ++ command ++ " )"
+ cronjobfile = "/etc/cron.d/" ++ map sanitize desc
+ sanitize c
+ | isAlphaNum c = c
+ | otherwise = '_'
+
+-- | 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)
+
+-- | Installs a cron job to run propellor.
+runPropellor :: CronTimes -> Property
+runPropellor times = niceJob "propellor" times "root" localdir "make"