diff options
Diffstat (limited to 'nixos/tests/dsl.nix')
| -rw-r--r-- | nixos/tests/dsl.nix | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/nixos/tests/dsl.nix b/nixos/tests/dsl.nix new file mode 100644 index 0000000..d11a231 --- /dev/null +++ b/nixos/tests/dsl.nix @@ -0,0 +1,247 @@ +{ + lib, + config, + pkgs, + ... +}: + +let + Dependency = + { name, ... }: + { + options.name = lib.mkOption { + type = lib.types.str; + default = name; + }; + options.runtime = lib.mkEnableOption "Keep a reference in the output store path to retain a runtime dependency"; + }; + Node = ( + { name, ... }: + { + options.name = lib.mkOption { + type = lib.types.str; + default = name; + }; + options.request = lib.mkEnableOption "Whether to mark the node for building"; + options.needed = lib.mkOption { + type = with lib.types; nullOr bool; + default = null; + description = "Whether the node must be built to satisfy all requests (either a requested node or a transitive dependency)"; + }; + options.chosen = lib.mkOption { + type = with lib.types; nullOr bool; + default = null; + description = "Whether the node is included in the build plan (i.t. it's `needed` and fitted into budget)"; + }; + options.cache = lib.mkOption { + type = lib.types.enum [ + "none" + "remote" + "local" + ]; + description = '' + Whether the dependency is pre-built and available in the local /nix/store ("local"), can be substituted ("remote"), or has to be built ("none") + ''; + default = "none"; + }; + options.inputs = lib.mkOption { + type = lib.types.attrsOf (lib.types.submodule Dependency); + default = { }; + }; + } + ); + Nodes = lib.types.attrsOf (lib.types.submodule Node); + scope-fun = import ./scope-fun.nix { + inherit lib; + inherit (config.dag) nodes; + }; +in +{ + options.dag = { + nodes = lib.mkOption { + type = Nodes; + description = "Derivation DAG, including cache status and references."; + }; + needBuilds = lib.mkOption { + type = with lib.types; nullOr int; + default = null; + description = "How many builds are required to satisfy all targets. Null disables the test"; + }; + needDownloads = lib.mkOption { + type = with lib.types; nullOr int; + default = null; + description = "How many downloads are required to satisfy all targets. Null disables the test"; + }; + choseBuilds = lib.mkOption { + type = with lib.types; nullOr int; + default = null; + description = "How many builds we expect evanix to choose to satisfy the maximum number of targets within the given budget. Null disables the test"; + }; + choseDownloads = lib.mkOption { + type = with lib.types; nullOr int; + default = null; + description = "How many downloads we expect evanix to choose to satisfy the maximum number of targets within the given budget. Null disables the test"; + }; + allowBuilds = lib.mkOption { + type = with lib.types; nullOr int; + default = null; + description = "How many builds evanix is allowed to choose. Null means no constraint"; + }; + allowDownloads = lib.mkOption { + type = with lib.types; nullOr int; + default = null; + description = "How many downloads evanix is allowed to choose. Null means no constraint"; + }; + }; + + config.nodes.builder = + { pkgs, ... }: + let + scope = pkgs.lib.makeScope pkgs.newScope scope-fun; + configJson = (pkgs.formats.json { }).generate "nix-dag.json" config.dag; + expressions = pkgs.writeText "guest-scope.nix" '' + let + pkgs = import ${pkgs.path} { }; + config = builtins.fromJSON (builtins.readFile ${configJson}); + in + pkgs.lib.makeScope pkgs.newScope (pkgs.callPackage ${./scope-fun.nix} { inherit (pkgs) lib; inherit (config) nodes; }) + ''; + tester = pkgs.writers.writePython3Bin "dag-test" { } '' + # flake8: noqa + + import json + import re + import subprocess + import sys + + with open("${configJson}", "r") as f: + config = json.load(f) + + nodes = config["nodes"] + print(f"config={config}", file=sys.stderr) + + + def path_to_name(path: str) -> str: + return re.sub(r"^[ ]*${builtins.storeDir}/[a-z0-9]*-([a-zA-Z0-9_-]+)(\.drv)?", r"\1", path) + + def parse_dry_run(output): + to_fetch = [ ] + to_build = [ ] + + bin = "undefined" + for line in output.split("\n"): + + if not line: + continue + + if re.match("^.*will be built:$", line): + bin = "to_build" + continue + elif re.match("^.*will be fetched.*:$", line): + bin = "to_fetch" + continue + + if not re.match("^[ ]*${builtins.storeDir}", line): + print(f"Skipping line: {line}", file=sys.stderr) + continue + + line = path_to_name(line) + + if bin == "to_build": + to_build.append(line) + elif bin == "to_fetch": + to_fetch.append(line) + else: + raise RuntimeError("nix-build --dry-run produced invalid output", line) + return to_fetch, to_build + + drv_to_schedule = {} + for name, node in nodes.items(): + p = subprocess.run(["nix-build", "${expressions}", "--dry-run", "--show-trace", "-A", name], check=True, stderr=subprocess.PIPE) + output = p.stderr.decode("utf-8") + to_fetch, to_build = parse_dry_run(output) + drv_to_schedule[name] = (to_fetch, to_build) + + drv_to_action = {} + for (to_fetch, to_build) in drv_to_schedule.values(): + for dep in to_fetch: + name = path_to_name(dep) + if name not in drv_to_action: + drv_to_action[name] = "fetch" + assert drv_to_action[name] == "fetch", f"Conflicting plan for {dep}" + for dep in to_build: + name = path_to_name(dep) + if name not in drv_to_action: + drv_to_action[name] = "build" + assert drv_to_action[name] == "build", f"Conflicting plan for {dep}" + + print(f"Schedule: {drv_to_action}", file=sys.stderr) + print(f"Per-derivation schedules: {drv_to_schedule}", file=sys.stderr) + + for name, node in nodes.items(): + error_msg = f"Wrong plan for {name}" + if node["cache"] == "local": + assert name not in drv_to_action, error_msg + elif node["cache"] == "remote": + assert drv_to_action.get(name, None) == "fetch", error_msg + elif node["cache"] == "unbuilt": + assert drv_to_action.get(name, None) == "build", error_msg + + need_dls, need_builds = set(), set() + for name, node in nodes.items(): + if node["request"]: + need_dls.update(drv_to_schedule[name][0]) + need_builds.update(drv_to_schedule[name][1]) + + if (expected_need_dls := config.get("needDownloads", None)) is not None: + assert len(need_dls) == expected_need_dls, f"{len(need_dls)} != {expected_need_dls}; building {need_dls}" + print("Verified `needDownloads`", file=sys.stderr) + + if (expected_need_builds := config.get("needBuilds", None)) is not None: + assert len(need_builds) == expected_need_builds, f"{len(need_builds)} != {expected_need_builds}; building {need_builds}" + print("Verified `needBuilds`", file=sys.stderr) + ''; + in + { + system.extraDependencies = + lib.pipe config.dag.nodes [ + builtins.attrValues + (builtins.filter ({ cache, ... }: cache == "local")) + (builtins.map ({ name, ... }: scope.${name})) + ] + ++ [ + expressions + pkgs.path + (pkgs.runCommand "any-run-command" { } "").inputDerivation + ]; + networking.hostName = "builder"; + networking.domain = "evanix-tests.local"; + nix.settings.substituters = lib.mkForce [ "http://substituter" ]; + systemd.tmpfiles.settings."10-expressions" = { + "/run/dag-test/nix-dag-test.json"."L+".argument = "${configJson}"; + "/run/dag-test/scope.nix"."L+".argument = "${expressions}"; + }; + environment.systemPackages = [ tester ]; + }; + config.nodes.substituter = + { pkgs, ... }: + let + scope = pkgs.lib.makeScope pkgs.newScope scope-fun; + in + { + system.extraDependencies = lib.pipe config.dag.nodes [ + builtins.attrValues + (builtins.filter ({ cache, ... }: cache == "remote")) + (builtins.map ({ name, ... }: scope.${name})) + ]; + services.nix-serve.enable = true; + services.nix-serve.port = 80; + services.nix-serve.openFirewall = true; + + # Allow listening on 80 + systemd.services.nix-serve.serviceConfig.User = lib.mkForce "root"; + networking.hostName = "substituter"; + + networking.domain = "evanix-tests.local"; + }; +} |