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+-- | Maintainer: 2016 Evan Cofsky <evan@theunixman.com>
+-- 
+-- Functions running zfs processes.
+
+module Propellor.Property.ZFS.Process where
+
+import Propellor.Base
+import Data.String.Utils (split)
+import Data.List
+
+-- | Gets the properties of a ZFS volume.
+zfsGetProperties ::  ZFS -> IO ZFSProperties
+zfsGetProperties z =
+	let plist = fromPropertyList . map (\(_:k:v:_) -> (k, v)) . (map (split "\t"))
+	in plist <$> runZfs "get" [Just "-H", Just "-p", Just "all"] z
+
+zfsExists :: ZFS -> IO Bool
+zfsExists z = any id . map (isInfixOf (zfsName z))
+	<$> runZfs "list" [Just "-H"] z
+
+-- | Runs the zfs command with the arguments.
+--
+-- Runs the command with -H which will skip the header line and
+-- separate all fields with tabs.
+--
+-- Replaces Nothing in the argument list with the ZFS pool/dataset.
+runZfs :: String -> [Maybe String] -> ZFS -> IO [String]
+runZfs cmd args z = lines <$> uncurry readProcess (zfsCommand cmd args z)
+
+-- | Return the ZFS command line suitable for readProcess or cmdProperty.
+zfsCommand :: String -> [Maybe String] -> ZFS -> (String, [String])
+zfsCommand cmd args z = ("zfs", cmd:(map (maybe (zfsName z) id) args))