Fix filename of the reuploaded sources

lib/SlackBuilder/Download.hs

@@ -131,12 +131,19 @@ commit packagePath version = do
                 }
          in readCreateProcessWithExitCode createCheckoutProcess ""
 
-hostedSources :: Text -> SlackBuilderT URI
-hostedSources absoluteURL = SlackBuilderT (asks downloadURL)
-    >>= liftIO . URI.mkURI . (<> absoluteURL)
+hostedSources :: NonEmpty Text -> SlackBuilderT URI
+hostedSources urlPathPieces = do
+        downloadURL' <- SlackBuilderT (asks downloadURL) >>= URI.mkURI
+        urlPathPieces' <- traverse URI.mkPathPiece urlPathPieces
 
-remoteFileExists :: Text -> SlackBuilderT Bool
-remoteFileExists url = hostedSources url
+        let updatedPath = case URI.uriPath downloadURL' of
+                Just (_, existingPath) ->
+                    NonEmpty.append existingPath urlPathPieces'
+                Nothing -> urlPathPieces'
+        pure $ downloadURL'{ uriPath = Just (False, updatedPath) }
+
+remoteFileExists :: NonEmpty Text -> SlackBuilderT Bool
+remoteFileExists urlPathPieces = hostedSources urlPathPieces
     >>= traverse (runReq httpConfig . go . fst) . useHttpsURI
     <&> maybe False ((== 200) . responseStatusCode)
   where
@@ -194,12 +201,14 @@ sinkHash = sink hashInit
 
 cloneAndUpload :: Text -> FilePath -> Text -> SlackBuilderT (URI, Digest MD5)
 cloneAndUpload repo tarballPath tagPrefix = do
-    localPath <- relativeToRepository $ tarballPath <.> "tar.xz"
-    let packageName = takeFileName $ takeDirectory tarballPath
-        remoteArchivePath = Text.pack
-            $ packageName </> takeFileName tarballPath <.> "tar.xz"
-    remoteResultURI <- hostedSources $ Text.cons '/' remoteArchivePath
-    remoteFileExists' <- remoteFileExists $ Text.cons '/' remoteArchivePath
+    let tarballFileName = takeFileName tarballPath <.> "tar.xz"
+        packageName = takeFileName $ takeDirectory tarballPath
+        remoteArchivePath = Text.pack $ packageName </> tarballFileName
+        urlPathPieces = Text.pack <$> packageName :| [tarballFileName]
+
+    localPath <- relativeToRepository tarballFileName
+    remoteResultURI <- hostedSources urlPathPieces
+    remoteFileExists' <- remoteFileExists urlPathPieces
 
     if remoteFileExists'
     then (remoteResultURI,) . snd