282 lines
7.8 KiB
Haskell
282 lines
7.8 KiB
Haskell
{- git-annex fuzz generator
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-
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- Copyright 2013 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Command.FuzzTest where
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import Common.Annex
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import qualified Annex
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import Command
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import qualified Git.Config
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import Config
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import Utility.ThreadScheduler
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import Utility.DiskFree
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import Data.Time.Clock
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import System.Random (getStdRandom, random, randomR)
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import Test.QuickCheck
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import Control.Concurrent
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cmd :: Command
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cmd = notBareRepo $
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command "fuzztest" SectionTesting
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"generates fuzz test files"
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paramNothing (withParams seek)
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seek :: CmdParams -> CommandSeek
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seek = withNothing start
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start :: CommandStart
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start = do
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guardTest
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logf <- fromRepo gitAnnexFuzzTestLogFile
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showStart "fuzztest" logf
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logh <-liftIO $ openFile logf WriteMode
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void $ forever $ fuzz logh
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stop
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guardTest :: Annex ()
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guardTest = unlessM (fromMaybe False . Git.Config.isTrue <$> getConfig key "") $
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error $ unlines
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[ "Running fuzz tests *writes* to and *deletes* files in"
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, "this repository, and pushes those changes to other"
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, "repositories! This is a developer tool, not something"
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, "to play with."
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, ""
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, "Refusing to run fuzz tests, since " ++ keyname ++ " is not set!"
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]
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where
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key = annexConfig "eat-my-repository"
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(ConfigKey keyname) = key
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fuzz :: Handle -> Annex ()
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fuzz logh = do
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fuzzer <- genFuzzAction
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record logh $ flip Started fuzzer
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result <- tryNonAsync $ runFuzzAction fuzzer
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record logh $ flip Finished $
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either (const False) (const True) result
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record :: Handle -> (UTCTime -> TimeStampedFuzzAction) -> Annex ()
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record h tmpl = liftIO $ do
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now <- getCurrentTime
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let s = show $ tmpl now
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print s
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hPrint h s
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hFlush h
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{- Delay for either a fraction of a second, or a few seconds, or up
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- to 1 minute.
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-
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- The MinutesDelay is used as an opportunity to do housekeeping tasks.
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-}
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randomDelay :: Delay -> Annex ()
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randomDelay TinyDelay = liftIO $
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threadDelay =<< getStdRandom (randomR (10000, 1000000))
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randomDelay SecondsDelay = liftIO $
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threadDelaySeconds =<< Seconds <$> getStdRandom (randomR (1, 10))
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randomDelay MinutesDelay = do
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liftIO $ threadDelaySeconds =<< Seconds <$> getStdRandom (randomR (1, 60))
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reserve <- annexDiskReserve <$> Annex.getGitConfig
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free <- liftIO $ getDiskFree "."
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case free of
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Just have | have < reserve -> do
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warning "Low disk space; fuzz test paused."
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liftIO $ threadDelaySeconds (Seconds 60)
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randomDelay MinutesDelay
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_ -> noop
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data Delay
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= TinyDelay
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| SecondsDelay
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| MinutesDelay
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deriving (Read, Show, Eq)
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instance Arbitrary Delay where
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arbitrary = elements [TinyDelay, SecondsDelay, MinutesDelay]
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data FuzzFile = FuzzFile FilePath
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deriving (Read, Show, Eq)
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data FuzzDir = FuzzDir FilePath
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deriving (Read, Show, Eq)
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instance Arbitrary FuzzFile where
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arbitrary = FuzzFile <$> arbitrary
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instance Arbitrary FuzzDir where
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arbitrary = FuzzDir <$> arbitrary
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class ToFilePath a where
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toFilePath :: a -> FilePath
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instance ToFilePath FuzzFile where
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toFilePath (FuzzFile f) = f
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instance ToFilePath FuzzDir where
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toFilePath (FuzzDir d) = d
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isFuzzFile :: FilePath -> Bool
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isFuzzFile f = "fuzzfile_" `isPrefixOf` takeFileName f
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isFuzzDir :: FilePath -> Bool
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isFuzzDir d = "fuzzdir_" `isPrefixOf` d
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mkFuzzFile :: FilePath -> [FuzzDir] -> FuzzFile
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mkFuzzFile file dirs = FuzzFile $ joinPath (map toFilePath dirs) </> ("fuzzfile_" ++ file)
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mkFuzzDir :: Int -> FuzzDir
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mkFuzzDir n = FuzzDir $ "fuzzdir_" ++ show n
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{- File is placed inside a directory hierarchy up to 4 subdirectories deep. -}
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genFuzzFile :: IO FuzzFile
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genFuzzFile = do
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n <- getStdRandom $ randomR (0, 4)
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dirs <- replicateM n genFuzzDir
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file <- show <$> (getStdRandom random :: IO Int)
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return $ mkFuzzFile file dirs
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{- Only 16 distinct subdirectories are used. When nested 4 deep, this
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- yields 69904 total directories max, which is below the default Linux
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- inotify limit of 81920. The goal is not to run the assistant out of
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- inotify descriptors. -}
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genFuzzDir :: IO FuzzDir
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genFuzzDir = mkFuzzDir <$> (getStdRandom (randomR (1,16)) :: IO Int)
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data TimeStampedFuzzAction
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= Started UTCTime FuzzAction
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| Finished UTCTime Bool
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deriving (Read, Show)
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data FuzzAction
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= FuzzAdd FuzzFile
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| FuzzDelete FuzzFile
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| FuzzMove FuzzFile FuzzFile
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| FuzzModify FuzzFile
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| FuzzDeleteDir FuzzDir
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| FuzzMoveDir FuzzDir FuzzDir
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| FuzzPause Delay
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deriving (Read, Show, Eq)
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instance Arbitrary FuzzAction where
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arbitrary = frequency
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[ (50, FuzzAdd <$> arbitrary)
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, (50, FuzzDelete <$> arbitrary)
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, (10, FuzzMove <$> arbitrary <*> arbitrary)
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, (10, FuzzModify <$> arbitrary)
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, (10, FuzzDeleteDir <$> arbitrary)
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, (10, FuzzMoveDir <$> arbitrary <*> arbitrary)
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, (10, FuzzPause <$> arbitrary)
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]
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runFuzzAction :: FuzzAction -> Annex ()
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runFuzzAction (FuzzAdd (FuzzFile f)) = liftIO $ do
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createDirectoryIfMissing True $ parentDir f
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n <- getStdRandom random :: IO Int
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writeFile f $ show n ++ "\n"
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runFuzzAction (FuzzDelete (FuzzFile f)) = liftIO $ nukeFile f
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runFuzzAction (FuzzMove (FuzzFile src) (FuzzFile dest)) = liftIO $
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rename src dest
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runFuzzAction (FuzzModify (FuzzFile f)) = whenM isDirect $ liftIO $ do
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n <- getStdRandom random :: IO Int
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appendFile f $ show n ++ "\n"
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runFuzzAction (FuzzDeleteDir (FuzzDir d)) = liftIO $
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removeDirectoryRecursive d
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runFuzzAction (FuzzMoveDir (FuzzDir src) (FuzzDir dest)) = liftIO $
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rename src dest
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runFuzzAction (FuzzPause d) = randomDelay d
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genFuzzAction :: Annex FuzzAction
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genFuzzAction = do
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tmpl <- liftIO $ Prelude.head <$> sample' (arbitrary :: Gen FuzzAction)
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-- Fix up template action to make sense in the current repo tree.
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case tmpl of
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FuzzAdd _ -> do
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f <- liftIO newFile
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maybe genFuzzAction (return . FuzzAdd) f
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FuzzDelete _ -> do
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f <- liftIO $ existingFile 0 ""
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maybe genFuzzAction (return . FuzzDelete) f
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FuzzMove _ _ -> do
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src <- liftIO $ existingFile 0 ""
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dest <- liftIO newFile
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case (src, dest) of
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(Just s, Just d) -> return $ FuzzMove s d
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_ -> genFuzzAction
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FuzzMoveDir _ _ -> do
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md <- liftIO existingDir
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case md of
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Nothing -> genFuzzAction
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Just d -> do
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newd <- liftIO $ newDir (parentDir $ toFilePath d)
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maybe genFuzzAction (return . FuzzMoveDir d) newd
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FuzzDeleteDir _ -> do
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d <- liftIO existingDir
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maybe genFuzzAction (return . FuzzDeleteDir) d
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FuzzModify _ -> do
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f <- liftIO $ existingFile 0 ""
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maybe genFuzzAction (return . FuzzModify) f
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FuzzPause _ -> return tmpl
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existingFile :: Int -> FilePath -> IO (Maybe FuzzFile)
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existingFile 0 _ = return Nothing
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existingFile n top = do
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dir <- existingDirIncludingTop
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contents <- catchDefaultIO [] (getDirectoryContents dir)
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let files = filter isFuzzFile contents
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if null files
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then do
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let dirs = filter isFuzzDir contents
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if null dirs
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then return Nothing
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else do
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i <- getStdRandom $ randomR (0, length dirs - 1)
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existingFile (n - 1) (top </> dirs !! i)
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else do
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i <- getStdRandom $ randomR (0, length files - 1)
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return $ Just $ FuzzFile $ top </> dir </> files !! i
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existingDirIncludingTop :: IO FilePath
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existingDirIncludingTop = do
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dirs <- filter isFuzzDir <$> getDirectoryContents "."
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if null dirs
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then return "."
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else do
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n <- getStdRandom $ randomR (0, length dirs)
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return $ ("." : dirs) !! n
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existingDir :: IO (Maybe FuzzDir)
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existingDir = do
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d <- existingDirIncludingTop
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return $ if isFuzzDir d
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then Just $ FuzzDir d
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else Nothing
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newFile :: IO (Maybe FuzzFile)
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newFile = go (100 :: Int)
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where
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go 0 = return Nothing
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go n = do
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f <- genFuzzFile
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ifM (doesnotexist (toFilePath f))
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( return $ Just f
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, go (n - 1)
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)
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newDir :: FilePath -> IO (Maybe FuzzDir)
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newDir parent = go (100 :: Int)
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where
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go 0 = return Nothing
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go n = do
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(FuzzDir d) <- genFuzzDir
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ifM (doesnotexist (parent </> d))
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( return $ Just $ FuzzDir d
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, go (n - 1)
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)
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doesnotexist :: FilePath -> IO Bool
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doesnotexist f = isNothing <$> catchMaybeIO (getSymbolicLinkStatus f)
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