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{-
Copyright (C) 2022 Yuchen Pei.
This file is part of fsd.
fsd 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.
fsd 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 fsd. If not, see <https://www.gnu.org/licenses/>.
-}
{-# LANGUAGE ImportQualifiedPost #-}
{-# LANGUAGE OverloadedStrings #-}
module FSD.Download where
import System.FilePath
import Control.Monad
import Data.Function
import Data.List
import Data.Text (Text)
import Data.Text qualified as T
import System.Exit
import System.Process
import System.Random
wgetCommand = "wget"
wgetIndexFileFlags = "-O- 2>/dev/null"
gunzipCommand = "gunzip"
bunzip2Command = "bunzip2"
wgetMetadataFlags = "-N -nv -x -c"
sourcesUrl = "https://ftp.debian.org/debian/dists/stable/main/source/Sources.gz"
packagesUrl = "https://ftp.debian.org/debian/dists/stable/main/binary-amd64/Packages.gz"
translationUrl = "https://ftp.debian.org/debian/dists/stable/main/i18n/Translation-en.bz2"
data MetadataType = MTChangelog | MTCopyright deriving Eq
metadataUrlFile :: MetadataType -> Int -> String
metadataUrlFile mtype i = toFilename mtype ++ "_urls_" ++ show i
where toFilename MTChangelog = "changelog"
toFilename MTCopyright = "copyright"
wgetIndexFileCommand :: FilePath -> (String, String) -> String
wgetIndexFileCommand outputDir (url, filename) =
wgetCommand ++ " " ++ wgetIndexFileFlags ++ " " ++ url ++ "|" ++ extractCommand ++ " >" ++ (outputDir </> filename) ++ " && echo Done: " ++ filename
where
extractCommand = if isSuffixOf ".gz" url then gunzipCommand else bunzip2Command
downloadSources :: FilePath -> IO ExitCode
downloadSources outputDir =
waitForProcess =<<
(runCommand $ wgetIndexFileCommand outputDir (sourcesUrl, "Sources"))
downloadPackages :: FilePath -> IO ExitCode
downloadPackages outputDir =
waitForProcess =<<
(runCommand $ wgetIndexFileCommand outputDir (packagesUrl, "Packages"))
downloadTranslation :: FilePath -> IO ExitCode
downloadTranslation outputDir =
waitForProcess =<<
(runCommand $
wgetIndexFileCommand outputDir (translationUrl, "Translation-en"))
downloadMetadataFiles :: FilePath -> MetadataType -> Int -> IO [ProcessHandle]
downloadMetadataFiles root mtype nWorkers =
sequence $
( \i ->
runCommand
( wgetCommand ++ " " ++ wgetMetadataFlags
++ " -i " ++ (root </> metadataUrlFile mtype i)
++ " -P " ++ root
++ " && echo Done: worker " ++ show i
)
)
<$> [1 .. nWorkers]
writeWgetListFiles :: FilePath -> MetadataType -> [Text] -> Int -> IO ()
writeWgetListFiles outputDir mtype packages n = do
pairs <- zip [1 ..] . fmap T.unlines <$> mapM shuffle (replicate n urls)
mapM_ (\(i, list) ->
writeFile (outputDir </> metadataUrlFile mtype i)
(T.unpack list)) pairs
where
urls = metadataUrl mtype <$> packages
shuffle :: [Text] -> IO [Text]
shuffle xs =
fmap fst . sortBy (compare `on` snd) . zip xs
<$> replicateM n (randomRIO (0, n * n))
where
n = length xs
metadataUrl :: MetadataType -> Text -> Text
metadataUrl mtype pkgName =
"https://metadata.ftp-master.debian.org/changelogs/main/" <>
(if T.isPrefixOf "lib" pkgName
then T.take 4 pkgName else T.take 1 pkgName) <>
"/" <> pkgName <> "/" <> toFilename mtype
where
toFilename MTChangelog = "stable_changelog"
toFilename MTCopyright = "stable_copyright"
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