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| -rw-r--r-- | .gitignore | 3 | ||||
| -rw-r--r-- | COPYING | 674 | ||||
| -rw-r--r-- | README.md | 4 | ||||
| -rw-r--r-- | Setup.hs | 2 | ||||
| -rw-r--r-- | app/Main.hs | 6 | ||||
| -rw-r--r-- | package.yaml | 60 | ||||
| -rw-r--r-- | src/Lib.hs | 280 | ||||
| -rw-r--r-- | stack.yaml | 65 | ||||
| -rw-r--r-- | test/Spec.hs | 2 |
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diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..f84ea58 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +.stack-work/ +blockcopy.cabal +*~
\ No newline at end of file @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<https://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<https://www.gnu.org/licenses/why-not-lgpl.html>. diff --git a/README.md b/README.md new file mode 100644 index 0000000..19bcc87 --- /dev/null +++ b/README.md @@ -0,0 +1,4 @@ +# blockcopy +This program emulates a filesystem with only one file, which it writes in +blocks into a directory. The use case is to mount an encrypted volume on Google +Drive. I bet it'd be really fast with goofys. diff --git a/Setup.hs b/Setup.hs new file mode 100644 index 0000000..9a994af --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/app/Main.hs b/app/Main.hs new file mode 100644 index 0000000..6e9320f --- /dev/null +++ b/app/Main.hs @@ -0,0 +1,6 @@ +module Main where + +import Lib + +main :: IO () +main = blockCopyMain diff --git a/package.yaml b/package.yaml new file mode 100644 index 0000000..294dab4 --- /dev/null +++ b/package.yaml @@ -0,0 +1,60 @@ +name: blockcopy +version: 0.1.0.0 +github: "githubuser/blockcopy" +license: BSD3 +author: "Author name here" +maintainer: "example@example.com" +copyright: "2018 Author name here" + +extra-source-files: +- README.md +- ChangeLog.md + +# Metadata used when publishing your package +# synopsis: Short description of your package +# category: Web + +# To avoid duplicated efforts in documentation and dealing with the +# complications of embedding Haddock markup inside cabal files, it is +# common to point users to the README.md file. +description: Please see the README on GitHub at <https://github.com/githubuser/blockcopy#readme> + +dependencies: +- base >= 4.7 && < 5 +- unix +- concurrent-extra +- containers +- filepath +- bytestring +- HFuse +- directory +- parallel-io + +library: + source-dirs: src + +executables: + blockcopy-exe: + main: Main.hs + source-dirs: app + ghc-options: + - -threaded + - -rtsopts + - -with-rtsopts=-N + dependencies: + - blockcopy + +tests: + blockcopy-test: + main: Spec.hs + source-dirs: test + ghc-options: + - -threaded + - -rtsopts + - -with-rtsopts=-N + dependencies: + - blockcopy + +ghc-options: +- -Wall +- -Werror diff --git a/src/Lib.hs b/src/Lib.hs new file mode 100644 index 0000000..c90888b --- /dev/null +++ b/src/Lib.hs @@ -0,0 +1,280 @@ +{- + - Copyright 2018 Raymond Hogenson + + - This file is part of BlockCopy + + - BlockCopy is free software: you can redistribute it and/or modify + - it under the terms of the GNU General Public License as published by + - the Free Software Foundation, either version 3 of the License, or + - (at your option) any later version. + + - BlockCopy is distributed in the hope that it will be useful, + - but WITHOUT ANY WARRANTY; without even the implied warranty of + - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + - GNU General Public License for more details. + + - You should have received a copy of the GNU General Public License + - along with BlockCopy. If not, see <https://www.gnu.org/licenses/>. + -} + +module Lib (blockCopyMain) where + +import qualified Foreign.C.Error as E +import qualified System.Fuse as F +import qualified System.Posix.Types as T +import qualified Data.ByteString as B +import qualified System.FilePath as FP +import qualified Data.IORef as IOR +import qualified Data.Map as M +import qualified Control.Concurrent.ReadWriteLock as RWL +import qualified System.Posix.User as U +import qualified Control.Exception as Ex +import qualified System.Posix.Time as Ti +import qualified Data.ByteString.Char8 as C8 +import qualified System.Environment as En +import qualified System.Directory as D +import qualified Control.Concurrent.ParallelIO as P + +newtype Handle = Handle () + +data BlockCopy = + BlockCopy (IOR.IORef (M.Map Int RWL.RWLock)) FilePath + +statsMessage :: BlockCopy -> IO B.ByteString +statsMessage (BlockCopy _ store) = do + let stats = "store: " ++ store ++ "\n" + return $ C8.pack stats + +mkFuseGetFileStat :: BlockCopy -> FilePath -> IO (Either E.Errno F.FileStat) +mkFuseGetFileStat b s = do + ln ("fileStat on " ++ s) + userID <- U.getEffectiveUserID + groupID <- U.getEffectiveGroupID + statsSize <- fmap (fromIntegral . B.length) $ statsMessage b + case s of + "/" -> return $ Right $ F.FileStat F.Directory 0o777 1 userID groupID 0 0 0 0 0 0 + "/disk" -> return $ Right $ F.FileStat F.RegularFile 0o666 1 userID groupID 0 maxBound 0 0 0 0 + "/stats" -> return $ Right $ F.FileStat F.RegularFile 0o666 1 userID groupID 0 statsSize 0 0 0 0 + _ -> return $ Left $ E.eNOENT + +fuseReadSymbolicLink :: FilePath -> IO (Either E.Errno FilePath) +fuseReadSymbolicLink _ = return $ Left $ E.eNOENT + +fuseCreateDevice :: FilePath -> F.EntryType -> T.FileMode -> T.DeviceID -> IO E.Errno +fuseCreateDevice _ _ _ _ = do + ln "createDevice" + return E.eNOTSUP + +fuseCreateDirectory :: FilePath -> T.FileMode -> IO E.Errno +fuseCreateDirectory _ _ = do + ln "createDirectory" + return E.eNOTSUP + +fuseRemoveLink :: FilePath -> IO E.Errno +fuseRemoveLink _ = do + ln "removeLink" + return E.eNOTSUP + +fuseRemoveDirectory :: FilePath -> IO E.Errno +fuseRemoveDirectory _ = return E.eNOTSUP + +fuseCreateSymbolicLink :: FilePath -> FilePath -> IO E.Errno +fuseCreateSymbolicLink _ _ = return E.eNOTSUP + +fuseRename :: FilePath -> FilePath -> IO E.Errno +fuseRename _ _ = do + ln "rename" + return E.eNOTSUP + +fuseCreateLink :: FilePath -> FilePath -> IO E.Errno +fuseCreateLink _ _ = return E.eNOTSUP + +fuseSetFileMode :: FilePath -> T.FileMode -> IO E.Errno +fuseSetFileMode _ _ = return E.eNOTSUP + +fuseSetOwnerAndGroup :: FilePath -> T.UserID -> T.GroupID -> IO E.Errno +fuseSetOwnerAndGroup _ _ _ = return E.eNOTSUP + +mkFuseSetFileSize :: BlockCopy -> FilePath -> T.FileOffset -> IO E.Errno +mkFuseSetFileSize _ _ _ = return E.eOK + +fuseSetFileTimes :: FilePath -> T.EpochTime -> T.EpochTime -> IO E.Errno +fuseSetFileTimes _ _ _ = return E.eNOTSUP + +fuseOpen :: FilePath -> F.OpenMode -> F.OpenFileFlags + -> IO (Either E.Errno Handle) +fuseOpen "/disk" _ _ = do + ln "open /disk" + return $ Right $ Handle () +fuseOpen "/stats" _ _ = return $ Right $ Handle () +fuseOpen _ _ _ = return $ Left $ E.eNOENT + +blockSize :: T.ByteCount +blockSize = 4096 + +blockPath :: BlockCopy -> Int -> FilePath +blockPath (BlockCopy _ store) block = store FP.</> show block + +getLock :: BlockCopy -> Int -> IO RWL.RWLock +getLock (BlockCopy locks _) block = do + newLock <- RWL.new + IOR.atomicModifyIORef' + locks (\m -> + case M.lookup block m of + Nothing -> (M.insert block newLock m, newLock) + Just a -> (m, a)) + +withReadLocks :: BlockCopy -> [Int] -> IO a -> IO a +withReadLocks b blocks op = do + ls <- mapM (getLock b) blocks + mapM_ RWL.acquireRead ls + x <- op + mapM_ RWL.releaseRead ls + return x + +withWriteLocks :: BlockCopy -> [Int] -> IO a -> IO a +withWriteLocks b blocks op = do + ls <- mapM (getLock b) blocks + mapM_ RWL.acquireWrite ls + x <- op + mapM_ RWL.releaseWrite ls + return x + +readBlock :: BlockCopy -> Int -> IO B.ByteString +readBlock b block = do + x <- Ex.try + $ B.readFile + $ blockPath b block :: IO (Either Ex.SomeException B.ByteString) + case x of + Left e -> do + ln $ show e ++ ": read of non-existent block " ++ show block + return $ B.replicate (fromIntegral blockSize) 0 + Right s -> return $ B.take (fromIntegral blockSize) s + +mkFuseRead :: BlockCopy -> FilePath -> Handle -> T.ByteCount -> T.FileOffset + -> IO (Either E.Errno B.ByteString) +mkFuseRead store "/disk" _ count offset = do + ln $ "Read /disk count=" ++ show count ++ " offset=" ++ show offset + let block = fromIntegral offset `div` fromIntegral blockSize + let lastBlock = fromIntegral (offset + fromIntegral count - 1) + `div` fromIntegral blockSize + let blockOffset = offset `mod` fromIntegral blockSize + fmap + (Right . B.take (fromIntegral count) . B.drop (fromIntegral blockOffset)) + $ withReadLocks store [block..lastBlock] $ fmap (B.intercalate B.empty) + $ P.parallel $ map (readBlock store) [block..lastBlock] +mkFuseRead b "/stats" _ count offset = do + bs <- statsMessage b + return $ Right $ B.take (fromIntegral count) $ B.drop (fromIntegral offset) bs +mkFuseRead _ _ _ _ _ = return $ Left E.eNOENT + +ln :: String -> IO () +ln s = do + time <- Ti.epochTime + _ <- Ex.try + $ appendFile "/home/ray/log" + $ "[" ++ show time ++ "] " ++ s ++ "\n" :: IO (Either Ex.SomeException ()) + return () + +blit :: B.ByteString -> Int -> B.ByteString -> B.ByteString +blit a i x = B.intercalate B.empty [B.take i a, B.take (B.length a - i) x, B.drop (B.length x + i) a] + +mkFuseWrite :: BlockCopy -> FilePath -> Handle -> B.ByteString -> T.FileOffset + -> IO (Either E.Errno T.ByteCount) +mkFuseWrite store "/disk" _ string offset = do + ln $ "Write to /disk of size " ++ show (B.length string) + let block = fromIntegral offset `div` fromIntegral blockSize + let lastBlock = fromIntegral (offset + fromIntegral (B.length string) - 1) + `div` fromIntegral blockSize + let blockOffset = offset `mod` fromIntegral blockSize + withWriteLocks store [block..lastBlock] $ P.parallel_ + $ map (\bl -> + let mySuffix = + B.drop + ((bl - 1) * fromIntegral blockSize + fromIntegral blockOffset) + string + in if bl == block && blockOffset /= 0 + then do + currentContents <- readBlock store bl + B.writeFile (blockPath store bl) + (blit currentContents (fromIntegral blockOffset) string) + else if bl == lastBlock && B.length mySuffix < fromIntegral blockSize + then do + currentContents <- readBlock store bl + B.writeFile (blockPath store bl) + (blit currentContents 0 mySuffix) + else do + B.writeFile (blockPath store bl) + (B.take (fromIntegral blockSize) mySuffix)) + [block..lastBlock] + return $ Right $ fromIntegral $ B.length string +mkFuseWrite _ _ _ _ _ = return $ Left E.eNOENT + +fuseGetFileSystemStats :: String -> IO (Either E.Errno F.FileSystemStats) +fuseGetFileSystemStats _ = return $ Right $ F.FileSystemStats 512 0 0 0 1 0 255 + +fuseFlush :: FilePath -> Handle -> IO E.Errno +fuseFlush _ _ = return E.eOK + +fuseRelease :: FilePath -> Handle -> IO () +fuseRelease _ _ = return () + +fuseSynchronizeFile :: FilePath -> F.SyncType -> IO E.Errno +fuseSynchronizeFile _ _ = return E.eOK + +fuseOpenDirectory :: FilePath -> IO E.Errno +fuseOpenDirectory _ = return E.eOK + +mkFuseReadDirectory :: BlockCopy -> FilePath + -> IO (Either E.Errno [(FilePath, F.FileStat)]) +mkFuseReadDirectory b _ = do + s <- mkFuseGetFileStat b "/disk" + k <- mkFuseGetFileStat b "/stats" + case (s, k) of + (Right a, Right g) -> return $ Right [("disk", a), ("stats", g)] + (Left e, _) -> return $ Left e + (_, Left e) -> return $ Left e + +fuseReleaseDirectory :: FilePath -> IO E.Errno +fuseReleaseDirectory _ = return E.eOK + +fuseSynchronizeDirectory :: FilePath -> F.SyncType -> IO E.Errno +fuseSynchronizeDirectory _ _ = return E.eOK + +fuseAccess :: FilePath -> Int -> IO E.Errno +fuseAccess _ _ = return E.eOK + +fuseInit :: IO () +fuseInit = ln "init" + +fuseDestroy :: IO () +fuseDestroy = ln "destroy" + +handler :: Ex.SomeException -> IO E.Errno +handler e = do + ln $ "ERROR: " ++ show e + return E.eFAULT + +blockCopyMain :: IO () +blockCopyMain = do + locks <- IOR.newIORef M.empty + prog <- En.getProgName + args <- En.getArgs + case args of + [] -> putStrLn "please store" + (store : mArgs) -> do + ln "main" + trueStore <- D.canonicalizePath store + let bs = BlockCopy locks trueStore + F.fuseRun prog mArgs + (F.FuseOperations (mkFuseGetFileStat bs) fuseReadSymbolicLink + fuseCreateDevice + fuseCreateDirectory fuseRemoveLink + fuseRemoveDirectory fuseCreateSymbolicLink fuseRename fuseCreateLink + fuseSetFileMode fuseSetOwnerAndGroup + (mkFuseSetFileSize bs) fuseSetFileTimes fuseOpen (mkFuseRead bs) + (mkFuseWrite bs) fuseGetFileSystemStats + fuseFlush fuseRelease fuseSynchronizeFile fuseOpenDirectory + (mkFuseReadDirectory bs) fuseReleaseDirectory + fuseSynchronizeDirectory fuseAccess fuseInit fuseDestroy) + handler diff --git a/stack.yaml b/stack.yaml new file mode 100644 index 0000000..1fb1ec6 --- /dev/null +++ b/stack.yaml @@ -0,0 +1,65 @@ +# This file was automatically generated by 'stack init' +# +# Some commonly used options have been documented as comments in this file. +# For advanced use and comprehensive documentation of the format, please see: +# https://docs.haskellstack.org/en/stable/yaml_configuration/ + +# Resolver to choose a 'specific' stackage snapshot or a compiler version. +# A snapshot resolver dictates the compiler version and the set of packages +# to be used for project dependencies. For example: +# +# resolver: lts-3.5 +# resolver: nightly-2015-09-21 +# resolver: ghc-7.10.2 +# +# The location of a snapshot can be provided as a file or url. Stack assumes +# a snapshot provided as a file might change, whereas a url resource does not. +# +# resolver: ./custom-snapshot.yaml +# resolver: https://example.com/snapshots/2018-01-01.yaml +resolver: lts-12.17 + +# User packages to be built. +# Various formats can be used as shown in the example below. +# +# packages: +# - some-directory +# - https://example.com/foo/bar/baz-0.0.2.tar.gz +# - location: +# git: https://github.com/commercialhaskell/stack.git +# commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a +# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a +# subdirs: +# - auto-update +# - wai +packages: +- . +# Dependency packages to be pulled from upstream that are not in the resolver +# using the same syntax as the packages field. +# (e.g., acme-missiles-0.3) +extra-deps: +- HFuse-0.2.5.0@sha256:41620052c8029520634282b889bd64cf28f6b8524266290b1099c638d7e772a8 + +# Override default flag values for local packages and extra-deps +# flags: {} + +# Extra package databases containing global packages +# extra-package-dbs: [] + +# Control whether we use the GHC we find on the path +# system-ghc: true +# +# Require a specific version of stack, using version ranges +# require-stack-version: -any # Default +# require-stack-version: ">=1.9" +# +# Override the architecture used by stack, especially useful on Windows +# arch: i386 +# arch: x86_64 +# +# Extra directories used by stack for building +# extra-include-dirs: [/path/to/dir] +# extra-lib-dirs: [/path/to/dir] +# +# Allow a newer minor version of GHC than the snapshot specifies +# compiler-check: newer-minor diff --git a/test/Spec.hs b/test/Spec.hs new file mode 100644 index 0000000..cd4753f --- /dev/null +++ b/test/Spec.hs @@ -0,0 +1,2 @@ +main :: IO () +main = putStrLn "Test suite not yet implemented" |