nix shell for a development environment for a Gradle project

README.md

I was getting errors like...

$ ./gradlew build
... snip ...
FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':buildSearchableOptions'.
> A problem occurred starting process 'command '/home/rkb/.gradle/caches/modules-2/files-2.1/com.jetbrains/jbre/jbrx-8u202-linux-x64-b1483.49/jre/bin/java''

libfreetype.so.6: cannot open shared object file: No such file or directory

could not open terminal for stdout: could not get termcap entry

usage

$ nix-shell default.nix

then gradle build or whatever

see also

https://github.com/r-k-b/intellij-elm/commit/829154f3c10a3953889b86216ba1dd3f79a2a153

default.nix

# h/t: https://discourse.nixos.org/t/problem-with-gradle-building-kotlin-native/7272/2?u=r-k-b
# initially written for hacking on https://github.com/klazuka/intellij-elm

# Note that certain gradle tasks may still fail, if `GRADLE_USER_HOME` contains files downloaded
# by a previous gradle instance run outside of the FHS environment this nix file provides.
# (that is, if something weird happens, `rm -rf ~/.gradle` and try again)

{ pkgs ? import <nixpkgs> { } }:
let
  fhs = pkgs.buildFHSUserEnv {
    name = "gradle-env";
    targetPkgs = pkgs:
      (with pkgs; [
        gradle
        kotlin
        jdk
        zlib
        ncurses
        freetype # for missing libfreetype.so.6
      ]);
  };
in pkgs.stdenv.mkDerivation {
  name = "gradle-env-shell";
  nativeBuildInputs = [ fhs ];

  # this seems to trigger an infinite loop when direnv loads this nix file... how to avoid that?
  shellHook = "exec gradle-env";
}