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diff --git a/src/main/frege/buildclient/tasks/Executor.fr b/src/main/frege/buildclient/tasks/Executor.fr
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+++ b/src/main/frege/buildclient/tasks/Executor.fr
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+module buildclient.tasks.Executor where
+
+
+import buildclient.config.BuildConfig
+import frege.java.Net
+import frege.java.IO
+import Data.Array
+
+
+data HttpURLConnection = native java.net.HttpURLConnection where
+    -- Unchecked cast, but who cares
+    native fromUrlConnection "(java.net.HttpURLConnection)" :: MutableIO URLConnection -> IOMutable HttpURLConnection
+    native setRequestProperty :: MutableIO HttpURLConnection -> String -> String -> IO ()
+    native getHeaderField :: MutableIO HttpURLConnection -> String -> IO (Maybe String)
+    native getResponseCode :: MutableIO HttpURLConnection -> IO Int throws IOException
+
+data ZipEntry = native java.util.zip.ZipEntry where
+    native getName :: Mutable s ZipEntry -> ST s String
+    native isDirectory :: Mutable s ZipEntry -> ST s Bool
+
+data ZipInputStream = native java.util.zip.ZipInputStream where
+    native new :: MutableIO InputStream -> IOMutable ZipInputStream
+    native getNextEntry :: MutableIO ZipInputStream -> IO (Maybe (MutableIO ZipEntry)) throws IOException
+    native closeEntry :: MutableIO ZipInputStream -> IO () throws IOException
+
+bcDownloadSync :: File -> BuildSource -> IO ()
+bcDownloadSync targetDirectory (HttpSource url format archiveRoot skipDirs) = do
+    File.mkdirs targetDirectory
+
+    let etagFile = File.new targetDirectory "etag.txt"
+    oldEtagExists <- File.exists etagFile
+    oldEtag <- if oldEtagExists then readFileStr etagFile else pure ""
+
+    parsedUrl <- URL.new url
+    conn <- URL.openConnection parsedUrl >>= (HttpURLConnection.fromUrlConnection)
+    HttpURLConnection.setRequestProperty conn "If-None-Match" oldEtag
+
+    -- Get InputStream early to trigger communication with server -> load response headers
+    inputStream <- URLConnection.getInputStream conn
+
+    newEtag <- HttpURLConnection.getHeaderField conn "etag"
+    maybe (return ()) (writeFileStr etagFile) newEtag
+    resp <- HttpURLConnection.getResponseCode conn
+    case resp of
+        304 = return () -- 304 indicated etag hit
+        200 = do
+            let archiveFile = File.new targetDirectory "archive.zip"
+            saveInputStreamTo inputStream $ archiveFile
+            extractZip skipDirs archiveFile $ File.new targetDirectory "archive-extracted"
+        otherwise = fail ("Server replied with unexpected http code " ++ show resp)
+
+    return ()
+
+
+extractZip :: Int -> File -> File -> IO ()
+extractZip skipDirs archiveFile targetDirectory =
+    do
+        File.mkdirs targetDirectory
+        fis <- FileInputStream.new archiveFile
+        zis <- ZipInputStream.new fis
+        extractFiles zis
+        return ()
+    where
+        extractFiles zis = do
+            entry <- ZipInputStream.getNextEntry zis
+            case entry of
+                Just n -> extractFile zis n >> extractFiles zis
+                Nothing -> return ()
+        extractFile zis zentry = do
+            isdir <- ZipEntry.isDirectory zentry
+            if isdir
+            then return ()
+            else do
+                name <- ZipEntry.getName zentry
+                let (Right pattern) = Regex.compile "[/\\\\]"
+                let parts = drop skipDirs $ toList $ Regex.split (pattern) name
+                let targetFile = fold File.new targetDirectory parts
+                maybe (return false) File.mkdirs $ File.getParentFile targetFile
+                saveInputStreamTo zis targetFile
+                return ()
+
+writeFileStr :: File -> String -> IO ()
+writeFileStr file text = do
+    fos <- FileOutputStream.new file
+    osw <- OutputStreamWriter.new fos "UTF-8"
+    osw.write text
+    osw.close
+
+readFileStr :: File -> IO String
+readFileStr file = do
+    fis <- FileInputStream.new file
+    isr <- InputStreamReader.new fis "UTF-8"
+    getContentsOf isr
+
+saveInputStreamTo :: MutableIO InputStream -> File -> IO ()
+saveInputStreamTo is file =
+    do  maybe (return false) File.mkdirs $ File.getParentFile file
+        fos <- FileOutputStream.new file
+        arr <- newArray 4096
+        copyloop arr fos
+        fos.close
+        return ()
+    where
+        copyloop :: ArrayOf RealWorld Byte -> MutableIO FileOutputStream -> IO ()
+        copyloop buf to = do
+            rc <- InputStream.read is buf
+            if rc < 0
+            then return ()
+            else do
+                OutputStream.write to buf 0 rc
+                copyloop buf to