54 lines
1.7 KiB
Haskell
54 lines
1.7 KiB
Haskell
module Propellor.Property.File where
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import Propellor
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import System.Posix.Files
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type Line = String
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-- | Replaces all the content of a file.
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hasContent :: FilePath -> [Line] -> Property
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f `hasContent` newcontent = fileProperty ("replace " ++ f)
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(\_oldcontent -> newcontent) f
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-- | Ensures that a line is present in a file, adding it to the end if not.
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containsLine :: FilePath -> Line -> Property
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f `containsLine` l = fileProperty (f ++ " contains:" ++ l) go f
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where
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go ls
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| l `elem` ls = ls
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| otherwise = ls++[l]
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-- | Ensures that a line is not present in a file.
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-- Note that the file is ensured to exist, so if it doesn't, an empty
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-- file will be written.
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lacksLine :: FilePath -> Line -> Property
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f `lacksLine` l = fileProperty (f ++ " remove: " ++ l) (filter (/= l)) f
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-- | Removes a file. Does not remove symlinks or non-plain-files.
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notPresent :: FilePath -> Property
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notPresent f = check (doesFileExist f) $ Property (f ++ " not present") $
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makeChange $ nukeFile f
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fileProperty :: Desc -> ([Line] -> [Line]) -> FilePath -> Property
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fileProperty desc a f = Property desc $ go =<< doesFileExist f
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where
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go True = do
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ls <- lines <$> readFile f
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let ls' = a ls
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if ls' == ls
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then noChange
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else makeChange $ viaTmp updatefile f (unlines ls')
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go False = makeChange $ writeFile f (unlines $ a [])
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-- viaTmp makes the temp file mode 600.
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-- Replicate the original file mode before moving it into place.
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updatefile f' content = do
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writeFile f' content
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getFileStatus f >>= setFileMode f' . fileMode
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-- | Ensures a directory exists.
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dirExists :: FilePath -> Property
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dirExists d = check (not <$> doesDirectoryExist d) $ Property (d ++ " exists") $
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makeChange $ createDirectoryIfMissing True d
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