[clhodapp]

A system-manager configuration can now be the parent of the configurations declared inside it, the way a NixOS or darwin machine is. system-manager switch applies the homes and hjem configurations declared inside the machine.

Stacked on #101.

What changes

• modules/systemManager/default is the new default system-manager module. A system-manager configuration imports it unless it passes moduleImports. It imports two modules and sets caisson.forChildren:
  • modules/systemManager/home-manager-activation and modules/systemManager/hjem-activation link to the NixOS modules of the same names. system-manager declares users.users and the systemd options. It starts the units wanted by multi-user.target with system-manager.target, so the NixOS units work unchanged.
  • caisson.forChildren gives each home and each hjem configuration the module system-manager-parent. That module is a link to nixos-parent, and it sets the home directory from the account the machine declares in users.users.
• The two NixOS activation modules import the core module of the class they are evaluated in, chosen from the manifest. The hjem module writes system.extraDependencies only where that option exists, and system-manager has no such option.
• Both nixos-parent modules read the nearest NixOS or system-manager configuration above them.
• system-manager counts as a machine in three places:
  • home names: a home inside machine box is published as homeConfigurations."probe@box";
  • the osConfig and utils a hjem configuration receives;
  • the check that leaves out configurations an inner machine activates. The darwin modules make the same check.
• The assertion messages say "this machine" rather than "this NixOS configuration".

Testing

• The new pinned-world test systemManagerActivatesWhatIsDeclaredInside declares a home and a hjem configuration inside a system-manager machine. It checks the home directories, the units home-manager-probe and hjem-activate@, the hjem packages in users.users.probe.packages, and the published home name.
• nix flake check passes, eval-weight gate included.
• nix flake check --no-build passes in all 17 workspace consumers, with both the flake's caisson input and the tests/dependencies caisson pin pointed at this branch. ch-system-manager ran on test/system-manager-configurations (refactor: nixos-minimal as its own integration over the nixos class #15).

Docs: nix-caisson/nix-caisson.github.io, branch docs/system-manager-parent.

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