nixpkgs/nixos/modules/programs/java.nix

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# This module provides JAVA_HOME, with a different way to install java
# system-wide.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.programs.java;
in
{
options = {
programs.java = {
enable = mkEnableOption "java" // {
description = ''
Install and setup the Java development kit.
<note>
<para>This adds JAVA_HOME to the global environment, by sourcing the
jdk's setup-hook on shell init. It is equivalent to starting a shell
through 'nix-shell -p jdk', or roughly the following system-wide
configuration:
</para>
<programlisting>
environment.variables.JAVA_HOME = ''${pkgs.jdk.home}/lib/openjdk;
environment.systemPackages = [ pkgs.jdk ];
</programlisting>
</note>
'';
};
package = mkOption {
default = pkgs.jdk;
defaultText = literalExpression "pkgs.jdk";
description = ''
Java package to install. Typical values are pkgs.jdk or pkgs.jre.
'';
type = types.package;
};
};
};
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
environment.shellInit = ''
test -e ${cfg.package}/nix-support/setup-hook && source ${cfg.package}/nix-support/setup-hook
'';
};
}