Java: Difference between revisions

@@ Line 41: / Line 41: @@
    programs.java = { enable = true; package = pkgs.oraclejre8; };
 }
+</syntaxhighlight>
+Working with `requireFile` (manual downloading the tarballs and manual adding in to the nix store) might be annoying and nixops-unfriendly, so it can be overrides in overlays
+<syntaxhighlight lang="nix">
+let
+  files = {
+    "jdk-8u241-linux-linux-arm32-vfp-hflt.tar.gz" = /home/user/blobs/java/jdk-8u241-linux-linux-arm32-vfp-hflt.tar.gz;
+    "jdk-8u241-linux-linux-arm64-vfp-hflt.tar.gz" = /home/user/blobs/java/jdk-8u241-linux-linux-arm64-vfp-hflt.tar.gz;
+    "jdk-8u241-linux-i586.tar.gz"                 = /home/user/blobs/java/jdk-8u241-linux-i586.tar.gz;
+    "jdk-8u241-linux-x64.tar.gz"                  = /home/user/blobs/java/jdk-8u241-linux-x64.tar.gz;
+  };
+in
+nixpkgs.overlays = [
+  (self: super: {
+    requireFile = args @ {name, url, sha1 ? null, sha256 ? null}:
+      if files?${name} then
+        self.stdenvNoCC.mkDerivation {
+          inherit name;
+          outputHashMode = "flat";
+          outputHashAlgo = if sha256 == null then "sha256" else "sha1";
+          outputHash     = if sha256 == null then  sha256  else  sha1 ;
+          buildCommand   = "cp ${files.${name}} $out";
+        }
+      else
+        super.requireFile args;
+  )
+];
 </syntaxhighlight>