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diff --git a/src/Propellor/Property/File.hs b/src/Propellor/Property/File.hs
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+module Propellor.Property.File where
+
+import Propellor
+import Utility.FileMode
+
+import System.Posix.Files
+import System.PosixCompat.Types
+
+type Line = String
+
+-- | Replaces all the content of a file.
+hasContent :: FilePath -> [Line] -> Property
+f `hasContent` newcontent = fileProperty ("replace " ++ f)
+	(\_oldcontent -> newcontent) f
+
+-- | Ensures a file has contents that comes from PrivData.
+--
+-- The file's permissions are preserved if the file already existed.
+-- Otherwise, they're set to 600.
+hasPrivContent :: FilePath -> Property
+hasPrivContent f = property desc $ withPrivData (PrivFile f) $ \privcontent -> 
+	ensureProperty $ fileProperty' writeFileProtected desc
+		(\_oldcontent -> lines privcontent) f
+  where
+	desc = "privcontent " ++ f
+
+-- | Leaves the file world-readable.
+hasPrivContentExposed :: FilePath -> Property
+hasPrivContentExposed f = hasPrivContent f `onChange`
+	mode f (combineModes (ownerWriteMode:readModes))
+
+-- | Ensures that a line is present in a file, adding it to the end if not.
+containsLine :: FilePath -> Line -> Property
+f `containsLine` l = f `containsLines` [l]
+
+containsLines :: FilePath -> [Line] -> Property
+f `containsLines` l = fileProperty (f ++ " contains:" ++ show l) go f
+  where
+	go ls
+		| all (`elem` ls) l = ls
+		| otherwise = ls++l
+
+-- | Ensures that a line is not present in a file.
+-- Note that the file is ensured to exist, so if it doesn't, an empty
+-- file will be written.
+lacksLine :: FilePath -> Line -> Property
+f `lacksLine` l = fileProperty (f ++ " remove: " ++ l) (filter (/= l)) f
+
+-- | Removes a file. Does not remove symlinks or non-plain-files.
+notPresent :: FilePath -> Property
+notPresent f = check (doesFileExist f) $ property (f ++ " not present") $ 
+	makeChange $ nukeFile f
+
+fileProperty :: Desc -> ([Line] -> [Line]) -> FilePath -> Property
+fileProperty = fileProperty' writeFile
+fileProperty' :: (FilePath -> String -> IO ()) -> Desc -> ([Line] -> [Line]) -> FilePath -> Property
+fileProperty' writer desc a f = property desc $ go =<< liftIO (doesFileExist f)
+  where
+	go True = do
+		ls <- liftIO $ lines <$> readFile f
+		let ls' = a ls
+		if ls' == ls
+			then noChange
+			else makeChange $ viaTmp updatefile f (unlines ls')
+	go False = makeChange $ writer f (unlines $ a [])
+
+	-- viaTmp makes the temp file mode 600.
+	-- Replicate the original file's owner and mode.
+	updatefile f' content = do
+		writer f' content
+		s <- getFileStatus f
+		setFileMode f' (fileMode s)
+		setOwnerAndGroup f' (fileOwner s) (fileGroup s)
+
+-- | Ensures a directory exists.
+dirExists :: FilePath -> Property
+dirExists d = check (not <$> doesDirectoryExist d) $ property (d ++ " exists") $
+	makeChange $ createDirectoryIfMissing True d
+
+-- | Ensures that a file/dir has the specified owner and group.
+ownerGroup :: FilePath -> UserName -> GroupName -> Property
+ownerGroup f owner group = property (f ++ " owner " ++ og) $ do
+	r <- ensureProperty $ cmdProperty "chown" [og, f]
+	if r == FailedChange
+		then return r
+		else noChange
+  where
+	og = owner ++ ":" ++ group
+
+-- | Ensures that a file/dir has the specfied mode.
+mode :: FilePath -> FileMode -> Property
+mode f v = property (f ++ " mode " ++ show v) $ do
+	liftIO $ modifyFileMode f (\_old -> v)
+	noChange