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https://github.com/NixOS/nixpkgs.git
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978a08c88f
Tools that want to deploy NixOS all re-implement the same core logic available in `nixos-rebuild-ng` (bin/switch-to-configuration + nix-env -p) because they want to be able to deploy specific system closures. By adding a `--store-path` flag, tools can now directly invoke nixos-rebuild-ng instead. Bringing the interface to a higher level allows us to incorporate ideas such as health checks and auto-rollbacks that are harder to achieve on the lower layer.
102 lines
3.1 KiB
Nix
102 lines
3.1 KiB
Nix
{ hostPkgs, ... }:
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{
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name = "nixos-rebuild-store-path";
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# TODO: remove overlay from nixos/modules/profiles/installation-device.nix
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# make it a _small package instead, then remove pkgsReadOnly = false;.
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node.pkgsReadOnly = false;
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nodes = {
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machine =
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{ lib, pkgs, ... }:
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{
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imports = [
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../modules/profiles/installation-device.nix
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../modules/profiles/base.nix
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];
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nix.settings = {
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substituters = lib.mkForce [ ];
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hashed-mirrors = null;
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connect-timeout = 1;
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};
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system.includeBuildDependencies = true;
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system.extraDependencies = [
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# Not part of the initial build apparently?
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pkgs.grub2
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];
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system.switch.enable = true;
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virtualisation = {
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cores = 2;
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memorySize = 4096;
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};
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};
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};
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testScript =
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let
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configFile =
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hostname:
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hostPkgs.writeText "configuration.nix" # nix
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''
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{ lib, pkgs, ... }: {
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imports = [
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./hardware-configuration.nix
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<nixpkgs/nixos/modules/testing/test-instrumentation.nix>
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];
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boot.loader.grub = {
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enable = true;
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device = "/dev/vda";
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forceInstall = true;
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};
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documentation.enable = false;
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networking.hostName = "${hostname}";
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}
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'';
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in
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# python
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''
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machine.start()
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machine.succeed("udevadm settle")
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machine.wait_for_unit("multi-user.target")
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machine.succeed("nixos-generate-config")
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with subtest("Build configuration without switching"):
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machine.copy_from_host(
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"${configFile "store-path-test"}",
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"/etc/nixos/configuration.nix",
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)
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store_path = machine.succeed("nix-build '<nixpkgs/nixos>' -A system --no-out-link").strip()
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machine.succeed(f"test -f {store_path}/nixos-version")
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with subtest("Switch using --store-path"):
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machine.succeed(f"nixos-rebuild switch --store-path {store_path}")
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hostname = machine.succeed("cat /etc/hostname").strip()
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assert hostname == "store-path-test", f"Expected hostname 'store-path-test', got '{hostname}'"
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with subtest("Test using --store-path"):
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machine.copy_from_host(
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"${configFile "store-path-test-2"}",
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"/etc/nixos/configuration.nix",
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)
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store_path_2 = machine.succeed("nix-build '<nixpkgs/nixos>' -A system --no-out-link").strip()
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machine.succeed(f"nixos-rebuild test --store-path {store_path_2}")
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hostname = machine.succeed("cat /etc/hostname").strip()
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assert hostname == "store-path-test-2", f"Expected hostname 'store-path-test-2', got '{hostname}'"
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with subtest("Ensure --store-path rejects invalid combinations"):
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machine.fail(f"nixos-rebuild switch --store-path {store_path} --rollback")
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machine.fail(f"nixos-rebuild switch --store-path {store_path} --flake .")
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machine.fail(f"nixos-rebuild build --store-path {store_path}")
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'';
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}
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