Description of changes

At DESY and other facilities, we use the Tango controls software (see the home page) and also dabble a bit with Nix. I wrote this derivation and successfully tested it on its own (by creating a MariaDB for the configuration and then running result/bin/tango start), as well as including it in the build for pytango in poetry2nix.

The controls system contains a few components:

1. The main server is written in C++. The main tango executable is just a script which starts the DataBaseds server.
2. Astor and Jive are Java-based tools to configure and inspect the running instance. I have tested that these indeed work. If you're wondering about the usage of openjdk8, that, unfortunately, is deliberate. Due to their usage of CORBA, they are stuck with Java 8 (exactly 8) for now.
3. To initialize the database (which can be MySQL or MariaDB, in theory - in practise, only MariaDB worked for me) there are .sql scripts. Those reference each other using the source foobar.sql directive, and I decided to use some sed calls to make these references absolute. Hope that's idiomatic enough.

To test this for real, you would need to follow these simple steps:

1. Start a MariaDB, create the tango database using the scripts in result/share/sql/create_db.sql
2. Build tango-controls and execute:

MYSQL_USER=youruser MYSQL_PASSWORD=yourpassword result/bin/tango start

3. Test the connection by running result/bin/jive.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.11 Release Notes (or backporting 22.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.