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26 lines
874 B
Haskell
26 lines
874 B
Haskell
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{-# OPTIONS_GHC -fglasgow-exts #-}
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module Main where
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import Distribution.InstalledPackageInfo (InstalledPackageInfo (..))
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import Distribution.Package (showPackageId)
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import System.FilePath
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import System.Environment
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usage = unlines [
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"<appname> in outDir"
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, "reads package db appname"
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, "and creates a package database for each contained package in outDir"
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, ""
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, "The purpose is to be able to control availible packages to ensure purity in nix."
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, "Separating each package from the auomated ghc build process is to painful (for me)"
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]
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main = do
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args <- getArgs
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case args of
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[inFile, outDir] -> do
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(packagedb :: [InstalledPackageInfo] ) <- fmap read $ readFile inFile
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mapM_ (\pi -> let fn = outDir </> (showPackageId $ package pi) ++ ".conf"
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in writeFile fn (show [pi])
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) packagedb
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_ -> putStrLn usage
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