From e26f35b8cedbf072ef5003c8b3a9d9e2cda487ec Mon Sep 17 00:00:00 2001
From: Justin Bedo <cu@cua0.org>
Date: Tue, 7 Sep 2021 14:34:15 +1000
Subject: [PATCH] rPackages.h2o: disable JAR fetching while in nix build

---
 pkgs/development/r-modules/default.nix | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index d1309024613e..6bd4ada845fd 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -1065,6 +1065,18 @@ let
       }) ];
     });
 
+    h2o = old.h2o.overrideDerivation (attrs: {
+      preConfigure = ''
+        # prevent download of jar file during install and postpone to first use
+        sed -i '/downloadJar()/d' R/zzz.R
+
+        # during runtime the package directory is not writable as it's in the
+        # nix store, so store the jar in the user's cache directory instead
+        substituteInPlace R/connection.R --replace \
+          'dest_file <- file.path(dest_folder, "h2o.jar")' \
+          'dest_file <- file.path("~/.cache/", "h2o.jar")'
+      '';
+    });
   };
 in
   self