Jenkins service depends on 2 versions of JDK

[SamLukeYes]

Describe the bug

jenkins depends on the default jdk package, but the NixOS module is hard-coded to use jdk17

Steps To Reproduce

Steps to reproduce the behavior:

1. Set services.jenkins.enable = true
2. Run nix-tree and search openjdk

Expected behavior

Only 1 JDK version should be used. Would be better if it can be configured by user.

Screenshots

Notify maintainers

@coreyoconnor @earldouglas @NeQuissimus

Metadata

• system: "x86_64-linux"
• host os: Linux 6.6.28-xanmod1, NixOS, 24.05 (Uakari), 24.05pre-git
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.18.2
• nixpkgs: /etc/nix/inputs/nixpkgs

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Add a 👍 reaction to issues you find important.

[Shawn8901]

The module defines an option that enables you to add additional software to the path with services.jenkins.packages (https://search.nixos.org/options?channel=23.11&from=0&size=50&sort=relevance&type=packages&query=services.jenkins.packages)

nixpkgs/nixos/modules/services/continuous-integration/jenkins/default.nix

Line 90 in 576ecd4

default = [ pkgs.stdenv pkgs.git pkgs.jdk17 config.programs.ssh.package pkgs.nix ];

you could set that option to your desired packages so remove the "additional" jdk. if you dont like it.

If its reasonable to set a different jdk than which jenkins is running on is a questionable default tho on my opinion.

[SamLukeYes]

The module defines an option that enables you to add additional software to the path with services.jenkins.packages (https://search.nixos.org/options?channel=23.11&from=0&size=50&sort=relevance&type=packages&query=services.jenkins.packages)

nixpkgs/nixos/modules/services/continuous-integration/jenkins/default.nix

Line 90 in 576ecd4

default = [ pkgs.stdenv pkgs.git pkgs.jdk17 config.programs.ssh.package pkgs.nix ];

you could set that option to your desired packages so remove the "additional" jdk. if you dont like it.

If its reasonable to set a different jdk than which jenkins is running on is a questionable default tho on my opinion.

Even with services.jenkins.packages set to an empty list, the start script still runs Jenkins on jdk17 instead of the JDK version used to build jenkins package.

nixpkgs/nixos/modules/services/continuous-integration/jenkins/default.nix

Lines 223 to 229 in 58a1abd

	script = ''
	${pkgs.jdk17}/bin/java ${concatStringsSep " " cfg.extraJavaOptions} -jar ${cfg.package}/webapps/jenkins.war --httpListenAddress=${cfg.listenAddress} \
	--httpPort=${toString cfg.port} \
	--prefix=${cfg.prefix} \
	-Djava.awt.headless=true \
	${concatStringsSep " " cfg.extraOptions}
	'';