Make generated CSS files group-readable so that nginx can actually serve them without me manually chmodding

package.yaml

@@ -53,6 +53,7 @@ dependencies:
 - foreign-store >=0.2 && <0.3
 - slug >=0.1 && <0.2
 - split >=0.2 && <0.3
+- unix >=2.7 && <2.8
 - yesod-auth-hashdb >=1.6.2 && <1.7
 - yesod-newsfeed >=1.6 && <1.7
 - yesod-sitemap >=1.4 && <1.5

src/Foundation.hs

@@ -25,7 +25,9 @@ import Entry.Kind ( EntryKind, allEntryKinds, pluralise )
 
 import Data.Aeson ( encode, object )
 import qualified Text.Blaze.Internal as B
+import qualified Data.Text as T
 import qualified Data.Text.Lazy.Encoding as E
+import qualified System.Posix.Files as F
 
 -- | The foundation datatype for your application. This can be a good place to
 -- keep settings and values requiring initialization before your application
@@ -130,7 +132,7 @@ instance Yesod App where
     addStaticContent ext mime content = do
         master <- getYesod
         let staticDir = appStaticDir $ appSettings master
-        addStaticContentExternal
+        external <- addStaticContentExternal
             minifym
             genFileName
             staticDir
@@ -138,6 +140,13 @@ instance Yesod App where
             ext
             mime
             content
+        case external of
+          (Just (Right (StaticR (StaticRoute filePath _), _))) -> liftIO $ do
+            let staticPath = ((staticDir ++ "/") ++) . T.unpack . T.intercalate "/" $ filePath
+            mode <- F.fileMode <$> F.getFileStatus staticPath
+            F.setFileMode staticPath $ mode `F.unionFileModes` F.groupReadMode
+          _ -> return ()
+        return external
       where
         -- Generate a unique filename based on the content itself
         genFileName lbs = "autogen-" ++ base64md5 lbs