nix-freeze-tree (empty) → 0.1.0.0

raw patch · 12 files changed

+1322/−0 lines, 12 filesdep +HUnitdep +basedep +binary

Dependencies added: HUnit, base, binary, bytestring, data-fix, directory, directory-tree, hnix, hnix-store-core, nix-freeze-tree, optparse-applicative, path, prettyprinter, raw-strings-qq, tasty, tasty-discover, tasty-hunit, text, transformers

Files

• CHANGELOG.md +5/−0
• LICENSE +661/−0
• README.md +118/−0
• bin/Main.hs +6/−0
• nix-freeze-tree.cabal +74/−0
• src/BuilderDirs.hs +13/−0
• src/Config.hs +102/−0
• src/NixBuilder.hs +116/−0
• src/NixFreezeTree.hs +115/−0
• src/NixHash.hs +83/−0
• test/ConfigTest.hs +28/−0
• test/Main.hs +1/−0

@@ -0,0 +1,5 @@+# Revision history for nix-freeze-tree++## 0.1.0.0 -- 2020-01-25++* First version. Released on an unsuspecting world.

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It is safest+to attach them to the start of each source file to most effectively+state the exclusion of warranty; and each file should have at least+the "copyright" line and a pointer to where the full notice is found.++    <one line to give the program's name and a brief idea of what it does.>+    Copyright (C) <year>  <name of author>++    This program is free software: you can redistribute it and/or modify+    it under the terms of the GNU Affero General Public License as published by+    the Free Software Foundation, either version 3 of the License, or+    (at your option) any later version.++    This program 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 Affero General Public License for more details.++    You should have received a copy of the GNU Affero General Public License+    along with this program.  If not, see <https://www.gnu.org/licenses/>.++Also add information on how to contact you by electronic and paper mail.++  If your software can interact with users remotely through a computer+network, you should also make sure that it provides a way for users to+get its source.  For example, if your program is a web application, its+interface could display a "Source" link that leads users to an archive+of the code.  There are many ways you could offer source, and different+solutions will be better for different programs; see section 13 for the+specific requirements.++  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 AGPL, see+<https://www.gnu.org/licenses/>.

@@ -0,0 +1,118 @@+# `nix-freeze-tree`++[![builds.sr.ht status](https://builds.sr.ht/~jack/nix-freeze-tree.svg)](https://builds.sr.ht/~jack/nix-freeze-tree?)+[![AGPLv3](https://git.sr.ht/~jack/nix-freeze-tree/blob/master/AGPLv3.png)](https://www.gnu.org/licenses/agpl-3.0.html)++`nix-freeze-tree` is a utility that walks a directory tree, and writes+out [Nix](https://nixos.org/nix/) expressions which rebuild that+tree. The generated expressions have two important properties:++1. Each file in the tree is built by a separate fixed-output+   derivation, and++2. Directories are built by derivations that symlink their contents+   recursively.++If you are using `nix copy` to ship a derivation between nix stores,+copying the derivation built by evaluating the output of+`nix-freeze-tree` can reuse existing files in the destination store,+as fixed-output derivations can be checked against a hash before+copying.++I use this to speed up deploys to my personal website. Running+`nix-freeze-tree` on the output from [my site+generator](https://git.sr.ht/~jack/jackkelly-name) and importing the+result means that `nix copy` only uploads new files, instead of+copying a single giant derivation containing every image on the site.+++## Installation++### Nix++If you use Nix, you can install the command into your local+environment by running `nix-env -f+https://git.sr.ht/~jack/nix-freeze-tree/archive/master.tar.gz -iA+command`.++### Cabal++If you have GHC installed, you can also build and install the binary+by running `cabal v2-install nix-freeze-tree`. You can also run the+binary from the build directory with `cabal v2-run nix-freeze-tree --+ARGS`.+++## Usage++```+Usage: nix-freeze-tree [--version] [-f|--force] [-v|--verbose]+                       [-o|--out-root OUT_ROOT] [IN_DIR]+  Write a tree of nix expressions to OUT_ROOT that build a derivation,+  symlinking every file in IN_DIR as a separate fixed-output derivation.++Available options:+  --version                Display version information and exit.+  -h,--help                Show this help text+  -f,--force               If any default.nix exist in the output directory,+                           remove them and generate anyway+  -v,--verbose             Display messages while working.+  -o,--out-root OUT_ROOT   Where to write the nix files (default: IN_DIR)+  IN_DIR                   Directory to freeze (default: .)+```+++## Calling from Nix++This repository's `default.nix` gives access to a function `freeze`,+which can be used to freeze the output of an existing derivation.++You can use it with Nix code that looks a bit like:++```nix+let+  # Some nixpkgs from somewhere+  nixpkgs = ...;++  # Whether you get it from a channel, a local checkout,+  # builtins.fetchTarball or builtins.fetchgit is up to you+  nix-freeze-tree-repo = builtins.fetchTarball { ... };++  # Derivation to freeze+  drv = mkDerivation { ... };++  # Evaluate default.nix from nix-freeze-tree-repo and hold onto the+  # freeze function+  freeze = (import nix-freeze-tree-repo { inherit nixpkgs; }).freeze;+in+  freeze drv+```+++## FAQ++Q: Why didn't you use+[`symlinkJoin`](https://nixos.org/nixpkgs/manual/#chap-trivial-builders)+to tie all the subtrees together?++A: I had the program mostly working before I remembered that+`symlinkJoin` existed. I thought about making each file's derivation+contain the directories leading up to it and then `symlinkJoin`ing+them all together, but decided against it for three reasons:++1. You can easily build subtrees using the Nix expressions generated+   by `nix-freeze-tree`;+2. Building the output of `nix-freeze-tree` will correctly create+   empty directories present in the input; and+3. Files are hashed based on their content alone, not their position+   in the tree-to-be-frozen (reducing duplication).+++## Other Resources++* Questions should go to the+  [nix-freeze-tree-discuss](https://lists.sr.ht/~jack/nix-freeze-tree-discuss)+  mailing list.++* Bug reports should go to the [bug+  tracker](https://todo.sr.ht/~jack/nix-freeze-tree).

@@ -0,0 +1,6 @@+module Main where++import qualified NixFreezeTree as N++main :: IO ()+main = N.main

@@ -0,0 +1,74 @@+cabal-version:       2.2++name:                nix-freeze-tree+version:             0.1.0.0+synopsis:            Convert a tree of files into fixed-output derivations+description:+  @nix-freeze-tree@ walks a directory tree and generates a tree of Nix+  expressions that recreate the tree from fixed-output derivations,+  one derivation per file in the source tree. See @README.md@ to get+  started.+homepage:            https://git.sr.ht/~jack/nix-freeze-tree+bug-reports:         https://todo.sr.ht/~jack/nix-freeze-tree+license:             AGPL-3.0-or-later+license-file:        LICENSE+author:              Jack Kelly+maintainer:          jack@jackkelly.name+copyright:           (c) 2020 Jack Kelly+category:            Application, Nix+build-type:          Simple+extra-source-files:  CHANGELOG.md, README.md+tested-with:         GHC == 8.6.5++executable nix-freeze-tree+  hs-source-dirs:     bin+  main-is:            Main.hs+  default-language:   Haskell2010+  ghc-options:        -Wall -threaded+  build-depends:      base+                    , nix-freeze-tree-internal++library nix-freeze-tree-internal+  hs-source-dirs:     src+  exposed-modules:    BuilderDirs+                    , Config+                    , NixBuilder+                    , NixFreezeTree+                    , NixHash+  other-modules:      Paths_nix_freeze_tree+  autogen-modules:    Paths_nix_freeze_tree+  default-language:   Haskell2010+  ghc-options:        -Wall+  build-depends:      base >= 4.9 && < 4.14+                    , binary >= 0.8.6.0 && < 0.9+                    , bytestring >= 0.10.8.2 && < 0.11+                    , data-fix >= 0.2.0 && < 0.3+                    , directory >= 1.3.3.0 && < 1.4+                    , directory-tree >= 0.12.1 && < 0.13+                    , hnix >= 0.6.1 && < 0.7+                    , hnix-store-core >= 0.1.0.0 && < 0.2+                    , optparse-applicative >= 0.14.3.0 && < 0.15+                    , path >= 0.6.1 && < 0.7+                    , prettyprinter >= 1.2.1.1 && < 1.3+                    , raw-strings-qq >= 1.1 && < 1.2+                    , text >= 1.2.3.1 && < 1.3+                    , transformers >= 0.5.6.2 && < 0.6++test-suite nix-freeze-tree-tests+  type:                exitcode-stdio-1.0+  main-is:             Main.hs+  other-modules:       ConfigTest+  ghc-options:         -Wall -threaded+  build-depends:       base+                     , HUnit >= 1.6.0.0 && < 1.7+                     , nix-freeze-tree-internal+                     , optparse-applicative+                     , tasty >= 1.2.3 && < 1.3+                     , tasty-discover >= 4.2.1 && < 4.3+                     , tasty-hunit >= 0.10.0.2 && < 0.11+  hs-source-dirs:      test+  default-language:    Haskell2010++source-repository head+  type:     git+  location: https://git.sr.ht/~jack/nix-freeze-tree

@@ -0,0 +1,13 @@+module BuilderDirs (BuilderDirs(..), currentDir) where++import Control.Applicative (liftA2)+import Path (Abs, Dir, Path, Rel, (</>))+import Control.Monad.Trans.Reader (ReaderT, asks)++data BuilderDirs = BuilderDirs+  { _root :: Path Abs Dir+  , _subdir :: Path Rel Dir+  }++currentDir :: ReaderT BuilderDirs IO (Path Abs Dir)+currentDir = liftA2 (</>) (asks _root) (asks _subdir)

@@ -0,0 +1,102 @@+{-# LANGUAGE FlexibleContexts       #-}+{-# LANGUAGE FlexibleInstances      #-}+{-# LANGUAGE FunctionalDependencies #-}+{-# LANGUAGE QuasiQuotes            #-}+{-# LANGUAGE StandaloneDeriving     #-}+{-# LANGUAGE TemplateHaskell        #-}++module Config+  ( Config(..)+  , configParserInfo+  , checkConfig+  ) where++import           Data.Functor.Identity (Identity(..))+import           Data.Version (showVersion)+import           Options.Applicative+import qualified Paths_nix_freeze_tree as NixFreezeTree+import           Text.RawString.QQ (r)++data Config f = Config+  { _force :: f Bool+  , _verbose :: f Bool+  , _outputRoot :: f FilePath+  , _inDir :: f FilePath+  }++deriving instance Eq (Config Identity)+deriving instance Eq (Config Maybe)+deriving instance Show (Config Identity)+deriving instance Show (Config Maybe)++version :: Parser (a -> a)+version = abortOption (InfoMsg message) $ mconcat+  [ long "version"+  , help "Display version information and exit."+  ]+  where+    message = "nix-freeze-tree " <> showVersion NixFreezeTree.version <> "\n"+      <> [r|Copyright (C) 2020 Jack Kelly++License AGPLv3+: GNU Affero General Public License version 3 or later+  <https://www.gnu.org/licenses/agpl-3.0.html>++This is free software: you are free to change and redistribute it.+There is NO WARRANTY, to the extent permitted by law.+|]++configParser :: Parser (Config Maybe)+configParser = Config+  <$> do fmap Just . switch $ mconcat+           [ long "force"+           , short 'f'+           , help+             $ "If any default.nix exist in the output directory, "+             <> "remove them and generate anyway"+           ]+  <*> do fmap Just . switch $ mconcat+           [ long "verbose"+           , short 'v'+           , help "Display messages while working."+           ]+  <*> do option (Just <$> str) $ mconcat+           [ long "out-root"+           , short 'o'+           , metavar "OUT_ROOT"+           , help "Where to write the nix files"+           , showDefaultWith $ const "IN_DIR"+           , value Nothing+           ]+  <*> do argument (Just <$> str) $ mconcat+           [ metavar "IN_DIR"+           , help "Directory to freeze"+           , showDefaultWith $ const "."+           , value (Just ".")+           ]++configParserInfo :: ParserInfo (Config Maybe)+configParserInfo = info (version <*> helper <*> configParser) $ mconcat+  [ header+    $ "nix-freeze-tree - "+    <> "Create fixed-output derivations for each file in a tree"+  , progDesc+    $ "Write a tree of nix expressions to OUT_ROOT that build a "+    <> "derivation, symlinking every file in IN_DIR as a separate "+    <> "fixed-output derivation."+  , fullDesc+  ]++checkConfig :: Config Maybe -> Maybe (Config Identity)+checkConfig = collectMaybes . applyDefaults+  where+    collectMaybes (Config f v o i) = Config+      <$> (Identity <$> f)+      <*> (Identity <$> v)+      <*> (Identity <$> o)+      <*> (Identity <$> i)++    applyDefaults c = Config+      (_force c)+      (_verbose c <|> Just False)+      (_outputRoot c <|> _inDir c)+      (_inDir c)

@@ -0,0 +1,116 @@+{-# LANGUAGE CPP               #-}+{-# LANGUAGE FlexibleContexts  #-}+{-# LANGUAGE OverloadedStrings #-}++module NixBuilder (BuilderDirs(..), mkBuildExpr) where++import           BuilderDirs (BuilderDirs(..), currentDir)+import           Control.Monad.Trans.Reader (ReaderT)+import           Data.Fix (Fix(..))+import           Data.Functor ((<&>))+import           Data.List (dropWhileEnd)+import           Data.List.NonEmpty (NonEmpty(..))+import qualified Data.List.NonEmpty as NE+import           Data.Text (Text)+import qualified Data.Text as T+import           Nix+import           NixHash (mkFileAttrs, replaceLeadingDot)+import           Path (Abs, Dir, File, Path, Rel)+import qualified Path as P++-- | Given a list of directory contents, construct a Nix expression+-- that builds a derivation, where:+--+-- * Every file is a symlink to a separate fixed-output derivation, and+-- * Every directory is a symlink to a derivation built with 'mkBuildExpr'+--+-- The ReaderT context is the path to the directory, split into an+-- absolute root and a subdirectory relative to the root.+mkBuildExpr :: [Path Rel File] -> [Path Rel Dir] -> ReaderT BuilderDirs IO NExpr+mkBuildExpr files dirs = do+  fileAttrs <- mkFileAttrs files++  let+    dirAttrs = mkDirAttr <$> dirs+    mSrcs = NE.nonEmpty $ dirAttrs ++ fileAttrs++  drv <- currentDir <&> case mSrcs of+    Nothing -> mkEmptyDerivation+    Just srcs -> mkDirectoryDerivation srcs++  pure $ mkParamset [stdenvArg] False ==> drv++  where+    mkDirAttr :: Path Rel Dir -> (Text, NExpr)+    mkDirAttr d =+      ( T.pack $ nixSafeFilePath d+      , "import" @@ mkPath False (nixSafeFilePath d) @@ mkNonRecSet+        [ inherit ["stdenv"] nullPos ]+      )++    stdenvArg =+      ( "stdenv"+      , Just $ ("import" @@ mkEnvPath "nixpkgs" @@ mkNonRecSet []) @. "stdenv"+      )++-- | Construct the @mkDerivation@ call for a directory. It builds a+-- derivation that symlinks to each file in $srcs under their original+-- names.+mkDirectoryDerivation :: NonEmpty (Text, NExpr) -> Path Abs Dir -> NExpr+mkDirectoryDerivation srcs d =+  mkLets ["paths" $= mkNonRecSet (NE.toList $ mkBinding <$> srcs)] $+    "stdenv" @. "mkDerivation" @@ mkNonRecSet+      [ "name" $= abspathToDerivationName d+      , "allowSubstitutes" $= mkBool False+      , "preferLocalBuild" $= mkBool True+      , "phases" $= mkList [mkStr "installPhase"]+      , "installPhase" $= installCmds+      ]++  where+    mkBinding :: (Text, NExpr) -> Binding NExpr+    mkBinding (t, e) =+      NamedVar (DynamicKey (Plain (DoubleQuoted [Plain t])) :| []) e nullPos++    installCmds :: NExpr+    installCmds = Fix . NStr . Indented 2 $+      [ Plain "mkdir -p $out;"+      , Plain "cd $out;"+      ] ++ foldMap (mkLinkCmd . fst) srcs+      where+        mkLinkCmd :: Text -> [Antiquoted Text NExpr]+        mkLinkCmd name =+          let+            -- Use double-quoted selections from "paths".+            -- This works on files that start with a leading '.'.+            sourcePath :: NonEmpty (NKeyName r)+            sourcePath = pure . DynamicKey . Plain $ DoubleQuoted [Plain name]++          in+            [ Plain "ln -sv "+            , Antiquoted . Fix $ NSelect "paths" sourcePath Nothing+            , Plain $ " " <> name <> ";"+            ]+++-- | Construct the @mkDerivation@ call for an empty directory.+mkEmptyDerivation :: Path Abs Dir -> NExpr+mkEmptyDerivation d = "stdenv" @. "mkDerivation" @@ mkNonRecSet+  [ "name" $= abspathToDerivationName d+  , "allowSubstitutes" $= mkBool False+  , "preferLocalBuild" $= mkBool True+  , "phases" $= mkList [mkStr "installPhase"]+  , "installPhase" $= mkStr "mkdir $out"+  ]++abspathToDerivationName :: Path Abs Dir -> NExpr+abspathToDerivationName+  = mkStr+  . T.pack+  . replaceLeadingDot+  . nixSafeFilePath+  . P.dirname++-- | Nix doesn't like trailing slashes in derivation names or paths.+nixSafeFilePath :: Path b t -> FilePath+nixSafeFilePath = dropWhileEnd (== '/') . P.toFilePath

@@ -0,0 +1,115 @@+{-# LANGUAGE QuasiQuotes     #-}++module NixFreezeTree (main) where++import           BuilderDirs (BuilderDirs(..))+import           Config (Config(..))+import qualified Config as C+import           Control.Exception (catch)+import           Control.Monad (when)+import           Control.Monad.IO.Class (MonadIO(..))+import           Control.Monad.Trans.Reader (ReaderT(..), asks, local)+import           Data.Bool (bool)+import           Data.Functor (void)+import           Data.Functor.Identity (Identity(..))+import           Data.List (isSuffixOf)+import           Data.Text (Text)+import qualified Data.Text.IO as T+import           Data.Text.Prettyprint.Doc (defaultLayoutOptions, layoutPretty)+import           Data.Text.Prettyprint.Doc.Render.Text (renderStrict)+import           Nix.Pretty (prettyNix)+import           NixBuilder (mkBuildExpr)+import           Options.Applicative (execParser)+import           Path (Abs, Dir, Path, (</>))+import qualified Path as P+import qualified System.Directory as D+import           System.Directory.Tree+  ( AnchoredDirTree(..)+  , DirTree(..)+  , FileName+  )+import qualified System.Directory.Tree as DT+import           System.Exit (exitFailure)+import           System.IO (hPutStrLn, stderr)++buildExprTree :: Path Abs Dir -> IO (DirTree Text)+buildExprTree p = flip runReaderT (BuilderDirs p [P.reldir|.|]) $ do+  (_ :/ inDirTree) <- P.toFilePath <$> asks _root >>= liftIO . DT.build++  case inDirTree of+    Dir _ fs -> go (".", fs) -- Use "." to avoid the root in output paths+    _ -> fail "Should never happen"++  where+    -- Walk the directory tree, building the @default.nix@ files, and+    -- keeping an absolute path to where we are in the ReaderT+    -- context.+    go :: (FileName, [DirTree a]) -> ReaderT BuilderDirs IO (DirTree Text)+    go (dirName, dirFiles) = do+      relDirName <- P.parseRelDir dirName+      local (\b -> b { _subdir = _subdir b </> relDirName }) $ do+        files <- traverse P.parseRelFile [ f | File f _ <- dirFiles ]+        dirs <- traverse P.parseRelDir [ d | Dir d _ <- dirFiles ]++        defaultNix <- renderNix <$> mkBuildExpr files dirs+        subdirs <- traverse go [ (d, fs) | Dir d fs <- dirFiles ]+        pure . Dir dirName $ File "default.nix" defaultNix:subdirs++    renderNix = renderStrict . layoutPretty defaultLayoutOptions . prettyNix++data DirConstraint = MustNameDirectory | MustNameDirectoryIfExists++toAbsDir :: DirConstraint -> FilePath -> IO (Path Abs Dir)+toAbsDir constraint d = liftIO $ do+  absD <- (D.canonicalizePath d >>= P.parseAbsDir) `catch`+    \(P.InvalidAbsDir _) -> dieD "does not name a directory"++  isDir <- D.doesDirectoryExist d+  if isDir+    then pure absD+    else case constraint of+           MustNameDirectory -> dieD "does not name a directory"+           MustNameDirectoryIfExists -> D.doesPathExist d >>=+             bool (pure absD) (dieD "names something other than a directory")++  where+    dieD m = die $ show d <> " " <> m++writeNixTree :: Config Identity -> IO ()+writeNixTree cfg = do+  outRoot <- toAbsDir MustNameDirectoryIfExists $ get _outputRoot+  inDir <- toAbsDir MustNameDirectory $ get _inDir++  let outRootPath = P.toFilePath outRoot+  outPathTree@(_ :/ outFiles) <- liftIO $ DT.build outRootPath++  when (defaultNixExists outFiles) $+    if get _force+    then do+      vPutStrLn "a default.nix exists somewhere in the output tree, cleaning"+      void . liftIO $ flip DT.writeDirectoryWith outPathTree $ \fp _ ->+        when ("default.nix" `isSuffixOf` fp) $ do+          vPutStrLn $ "deleting " <> fp+          D.removePathForcibly fp+    else die "a default.nix exists somewhere in the output tree, cannot proceed"++  outTree <- buildExprTree inDir+  void $ flip DT.writeDirectoryWith (outRootPath :/ outTree) $ \fp t -> do+    vPutStrLn . ("writing " <>) =<< D.canonicalizePath fp+    T.writeFile fp t++  where+    get f = runIdentity $ f cfg++    defaultNixExists (File n _) = n == "default.nix"+    defaultNixExists (Dir _ cs) = any defaultNixExists cs+    defaultNixExists Failed{} = False++    vPutStrLn msg = when (get _verbose) $ putStrLn msg++main :: IO ()+main = C.checkConfig <$> execParser C.configParserInfo >>=+  maybe (fail "Should be impossible") writeNixTree++die :: MonadIO m => String -> m a+die msg = liftIO $ hPutStrLn stderr ("FATAL: " <> msg) *> exitFailure

@@ -0,0 +1,83 @@+{-# LANGUAGE DataKinds         #-}+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE TypeApplications  #-}++module NixHash (mkFileAttrs, replaceLeadingDot) where++import           BuilderDirs (BuilderDirs, currentDir)+import           Control.Monad.IO.Class (MonadIO(..))+import           Control.Monad.Trans.Reader+import           Data.Binary.Put (runPut)+import           Data.Bool (bool)+import qualified Data.ByteString.Lazy as BL+import           Data.Text (Text)+import qualified Data.Text as T+import           Nix+import           Path (Abs, File, Path, Rel, (</>), toFilePath)+import qualified System.Directory as D+import           System.Nix.Hash (HashAlgorithm(..), encodeBase32, hashLazy)+import           System.Nix.Nar+  ( FileSystemObject(..)+  , IsExecutable(..)+  , Nar(..)+  , putNar+  )++-- | Build a set of @filename -> derivation@ attributes.+mkFileAttrs :: [Path Rel File] -> ReaderT BuilderDirs IO [(Text, NExpr)]+mkFileAttrs = traverse $ \f -> do+  h <- mkFileAttr f+  pure (T.pack (toFilePath f), h)++-- | Hash the file, using Nix's NAR hash (the default to+-- @builtins.path@ is NAR-style recursive hashing), and build a call+-- to Nix's @builtins.path@ function. If @"file1"@ is a regular file,+-- @mkHashEntry "file1"@ will generate:+--+-- @+-- builtins.path {+--   path = ./file1;+--   sha256 = "<<hash of file1>>";+-- }+-- @+--+-- If @".file2"@ starts with a dot, that's an illegal Nix derivation+-- name, so @mkHashEntry ".file2"@ will generate:+--+-- @+-- builtins.path {+--   path = ./.file2;+--   name = "_file2";+--   sha256 = "<<hash of .file2>>"+-- }+-- @+mkFileAttr :: Path Rel File -> ReaderT BuilderDirs IO NExpr+mkFileAttr f = do+  absF <- (</> f) <$> currentDir+  h <- recursiveHash absF++  let bindings =+        [ "path" $= mkPath False (toFilePath absF)+        , "sha256" $= mkStr h+        ] ++ [ "name" $= mkStr (T.pack . replaceLeadingDot $ toFilePath f)+             | head (toFilePath f) == '.'+             ]+  pure $ "builtins" @. "path" @@ mkNonRecSet bindings+++-- | Serialise as per+-- https://gist.github.com/jbeda/5c79d2b1434f0018d693 , which is an+-- extract from Figure 5.2 of http://nixos.org/~eelco/pubs/phd-thesis.pdf ,+-- which is the Nix thesis.+recursiveHash :: MonadIO m => Path Abs File -> m Text+recursiveHash absF = do+  b <- liftIO . BL.readFile $ toFilePath absF+  executable <- bool NonExecutable Executable . D.executable+    <$> liftIO (D.getPermissions $ toFilePath absF)+  let nar = runPut . putNar . Nar $ Regular executable (BL.length b) b+  pure . encodeBase32 $ hashLazy @'SHA256 nar++-- | A leading dot is illegal in Nix derivation names. Replace it with '_'.+replaceLeadingDot :: FilePath -> FilePath+replaceLeadingDot ('.':f) = '_':f+replaceLeadingDot f = f

@@ -0,0 +1,28 @@+module ConfigTest where++import Config+import Data.Functor.Identity (Identity(..))+import Test.Tasty (TestTree, testGroup)+import Test.Tasty.HUnit (Assertion, (@?=), assertFailure, testCase)+import Options.Applicative (ParserResult(..), defaultPrefs, execParserPure)++test_optionParser :: TestTree+test_optionParser = testGroup "Option Parser"+  [ testCase "defaults" $ []+    `shouldParseTo` Config (i False) (i False) (i ".") (i ".")+  , testCase "dir only" $ ["here"]+    `shouldParseTo` Config (i False) (i False) (i "here") (i "here")+  , testCase "custom output dir" $ ["-o", "there", "here"]+    `shouldParseTo` Config (i False) (i False) (i "there") (i "here")+  , testCase "force" $ ["-f", "here"]+    `shouldParseTo` Config (i True) (i False) (i "here") (i "here")+  , testCase "verbose" $ ["-v"]+    `shouldParseTo` Config (i False) (i True) (i ".") (i ".")+  ]+  where i = Identity++shouldParseTo :: [String] -> Config Identity -> Assertion+args `shouldParseTo` c =+  case checkConfig <$> execParserPure defaultPrefs configParserInfo args of+    Success p -> p @?= Just c+    _ -> assertFailure "Parse failure"

@@ -0,0 +1,1 @@+{-# OPTIONS_GHC -F -pgmF tasty-discover #-}