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Substrate

Reusable Nix build patterns for all pleme-io repositories. One flake input gives every repo a complete build, test, and deploy pipeline -- from Rust services to Ruby infrastructure to TypeScript libraries.

What It Does

Substrate is a library of parameterized Nix functions. It produces no packages of its own. Consumers import it as a flake input and call its builders to produce packages, dev shells, apps, overlays, and home-manager modules.

12 languages (Rust, Go, Zig, Swift, TypeScript, Ruby, Python, .NET, Java, WASM, Web/Vite, Shell), 6 IaC platforms (Pangea, Terraform, Pulumi, Crossplane, Ansible, Helm), home-manager integration, and security-first infrastructure -- all from a single inputs.substrate.

Module Hierarchy

lib/
  types/          Type system — typed interfaces for all domains (pure, no pkgs)
    foundation.nix      19 enum/refined types (NixSystem, Architecture, Language, ...)
    ports.nix           Unified port representation with attrTag + coercedTo
    build-result.nix    Universal output contract (packages, devShells, apps)
    build-spec.nix      Per-language typed input specs (10 languages)
    service-spec.nix    HealthSpec, ScalingSpec, ResourceSpec, MonitoringSpec
    deploy-spec.nix     DockerImageSpec, DeploySpec, ReleaseSpec
    infra-spec.nix      WorkloadSpec, PolicyRule, MultiTierAppSpec
    kube-spec.nix       KubeMetadata, SecurityContext, Probes, RBAC
    convergence.nix     Stage typestate: declared → resolved → converged → verified
    validate.nix        mkTypedBuilder, validateSpec, checkBuildResult
    assertions.nix      Lightweight assertion guards for all builders
    tests.nix           79 pure eval tests
    assertion-tests.nix 47 pure eval tests
    property-tests.nix  18 property-based + convergence stage tests

  build/          Language-specific build patterns
    rust/           overlay, library, service, tool-release, leptos-build, crate2nix, devenv
                    scaffolds: leptos-app, rust-service, rust-tool, dioxus-app, gpu-app
    go/             overlay, tool, monorepo, grpc-service, docker
    zig/            overlay, tool-release, bootstrap, zls
    swift/          overlay, bootstrap, sdk-helpers
    typescript/     tool, library, library-flake
    ruby/           config, build, gem, gem-flake, scaffold: ruby-gem
    python/         package, uv
    dotnet/         build
    java/           maven
    wasm/           build (Yew/WASM with wasm-bindgen + wasm-opt)
    web/            build (Vite/React), docker, github-action

  kube/           Kubernetes resource builders (nix-kube)
    primitives/     29 pure K8s resource builders (no pkgs)
    compositions/   9 service archetypes (mkMicroservice, mkWorker, etc.)
    modules/        NixOS-style overlay system
    tests.nix       37 pure eval tests

  infra/          Infrastructure-as-Code patterns + Unified Infrastructure Theory
    workload-archetypes.nix   7 abstract archetypes -> K8s + Tatara + WASI
    compositions.nix          mkMultiTierApp, mkPipeline
    policies.nix              mkPolicy, evaluateAll, assertPolicies
    renderers/                kubernetes.nix, tatara.nix, wasi.nix
    tests/                    8 Nix eval test suites (151+ assertions)
    pangea-workspace.nix      Nix->YAML->Pangea config (shikumi pattern)
    pangea-infra.nix          Per-system Pangea project builder
    pangea-infra-flake.nix    Zero-boilerplate Pangea flake
    gated-pangea-workspace.nix  Test-gated workspace
    terraform-module.nix      TF validation
    terraform-provider.nix    TF provider builds
    pulumi-provider.nix       Multi-language SDK gen
    ansible-collection.nix    Galaxy collection packaging
    environment-config.nix    Environment variable config

  service/        Service lifecycle patterns
    helpers.nix               Docker compose, test runners
    platform-service.nix      Full platform service builder
    environment-apps.nix      Env-aware deployment apps
    product-sdlc.nix          Product SDLC app factory
    image-release.nix         Multi-arch OCI release
    helm-build.nix            Helm chart SDLC
    db-migration.nix          K8s migration jobs
    health-supervisor.nix     Health check builder

  hm/             home-manager integration (standalone, only needs nixpkgs.lib)
    service-helpers.nix       launchd + systemd service templates
    mcp-helpers.nix           MCP server deployment
    skill-helpers.nix         Claude Code skill framework
    typed-config-helpers.nix  JSON/YAML config from Nix options
    workspace-helpers.nix     Workspace config helpers
    secret-helpers.nix        Secret management helpers
    nixos-service-helpers.nix NixOS module patterns

  codegen/        Code generation patterns
    openapi-forge.nix         OpenAPI parsing + forge
    openapi-sdk.nix           Multi-language SDK gen
    openapi-rust-sdk.nix      Rust SDK gen
    source-registry.nix       Pinned source registry

  util/           Shared utilities (foundation layer)
    config.nix                Tokens, secrets, runtime tools
    darwin.nix                macOS SDK deps
    docker-helpers.nix        Docker build utilities
    release-helpers.nix       Release workflow helpers
    test-helpers.nix          Pure Nix eval test infra
    completions.nix           Shell completion gen
    repo-flake.nix            Universal flake builder
    monorepo-parts.nix        flake-parts monorepo module
    versioned-overlay.nix     N-track overlay gen
    flake-wrapper.nix         Flake boilerplate reduction

  devenv/         devenv.sh module templates (standalone)
    rust.nix, rust-service.nix, rust-tool.nix, rust-library.nix, leptos.nix, web.nix, nix.nix

  examples/       Deployment examples
    leptos-deploy.nix           Full Leptos PWA through all 3 renderers
    leptos-helm-values.nix      Helm values for Leptos SSR
    convergence-bridge.nix      Frontend in the convergence DAG
    leptos-tatara-jobspec.json  Tatara JobSpec for PWA
    leptos-wasi-config.json     WASI Preview 2 component config

build/shared/ Cross-cutting typed middleware docker-image.nix Universal Docker image builder (replaces per-language duplication) release-app.nix Shared release/bump/check-all factory devshell.nix Universal devShell with language presets

Dependency DAG

Modules follow a strict import hierarchy. Violations cause circular imports.

types/   (standalone -- pure DAG leaf, only needs nixpkgs.lib)
service/ ---> build/ ---> util/
build/   ---> types/
service/ ---> types/
infra/   ----------------> util/
infra/   ---> types/
codegen/ ----------------> util/
hm/      (standalone -- no internal deps, only nixpkgs.lib)
devenv/  (standalone -- devenv module format)

Cross-language imports within build/ are prohibited (e.g., rust/ cannot import from go/). util/ and types/ cannot import from any higher layer.

Type System — Typed Interfaces for All Domains

Every builder function validates its inputs through a typed interface layer. Invalid states are caught at Nix evaluation time with descriptive messages, not deep in derivation construction.

# Foundation types (19 enums + refined primitives)
types = import "${substrate}/lib/types" { lib = nixpkgs.lib; };
assert types.foundation.architecture.check "amd64";   # true
assert types.foundation.architecture.check "sparc64";  # false

# Assertion guards on every builder (50+ functions)
# Passing wrong types fails fast:
mkGoTool pkgs { pname = ""; ... }
# → error: pname: must be a non-empty string, got string

# Module-system validation on complex builders
rustServiceTyped = import "${substrate}/lib/build/rust/service-typed.nix" { ... };
rustServiceTyped { serviceName = "auth"; src = ./.; serviceType = "soap"; }
# → error: serviceType must be "graphql" or "rest", got "soap"

8 formal-methods improvements grounded in academic research:

Improvement Foundation What it prevents
Information flow Denning 1976 Secrets leaking into plain env/ConfigMap
Bilateral promises Burgess Promise Theory Service wiring errors (import without matching export)
Intrinsic attestation Necula PCC 1996 Gap between eval-time correctness and deploy-time proof
Recursive lattice merge CUE lattice theory Silent loss of nested defaults on partial override
Extensible renderers Mokhov categorical functors New backends require core changes
Monotonicity guard Knaster-Tarski theorem Modules removing services (breaking convergence)
Convergence typestate Brady dependent types Operating on specs at wrong convergence stage
Property-based tests ProTI/QuickCheck Renderer non-determinism, idempotence violations

362+ pure eval tests across 9 suites verify every type, assertion, and convergence property.

Security-First Infrastructure

Every infrastructure module in lib/infra/ enforces absolute least-privilege as the default. Security is not optional -- it is built into the type signatures.

  • IAM: Explicit allow-list, no wildcards (*) in resource ARNs or actions. Every service gets its own IAM role.
  • Encryption: KMS encryption on all storage (S3, DynamoDB). Never platform-default keys.
  • Lifecycle: prevent_destroy on all stateful resources. Destroy requires explicit override in a separate commit with PR review.
  • Tags: ManagedBy, Purpose, Environment, Team required on every resource. Untagged resources fail validation.
  • Secrets: Never in Nix store or Terraform state. Dynamic producers (Akeyless) with automatic rotation. Reference by path, not value.

See docs/security.md for the full specification.

Three-Layer Test Pyramid

Infrastructure is gated on tests. Tests must pass before plan or apply.

              Layer 3    InSpec live verification (post-apply, real cloud)
              Layer 2    RSpec architecture synthesis (zero cost, full graph)
              Layer 1    RSpec resource unit tests (instant, pure Ruby)
Layer Catches Cost Speed
1 Logic errors, wrong defaults, missing validations Zero Milliseconds
2 Composition errors, missing deps, wrong wiring Zero Seconds
3 Provider bugs, API incompatibilities, permissions Cloud Minutes

Every RSpec synthesis assertion has a corresponding InSpec control. What you synthesize is what you verify. The gated workspace enforces the ordering:

nix run .#test      # Layer 1 + 2 (must pass)
nix run .#plan      # Only runs if test passed
nix run .#apply     # Only runs if test passed
nix run .#verify    # Layer 3 (post-apply)

See docs/testing.md for examples and the mirroring pattern.

Typed Pangea Pattern

Architecture functions compose typed resource functions. The full resource graph is synthesized in pure Ruby with zero cloud cost, then verified post-apply with InSpec.

# Architecture: typed functions composing typed functions
class StateBackend
  def synthesize
    kms = Resources.kms_key("#{@workspace}-state-key")
    bucket = Resources.s3_bucket("#{@workspace}-state", @region, kms_key_id: kms[:arn])
    table = Resources.dynamodb_table("#{@workspace}-locks", kms_key_id: kms[:arn])
    [kms, bucket, table]
  end
end

Configuration flows through the shikumi pattern: Nix evaluates options, writes YAML, and the Pangea Ruby DSL reads it at runtime. No shell business logic between Nix and application execution.

See docs/adding-an-architecture.md for the full lifecycle.

Quick Start

Add as a flake input

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    substrate = {
      url = "github:pleme-io/substrate";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { nixpkgs, substrate, ... }: let
    system = "aarch64-darwin";
    substrateLib = substrate.lib.${system};
  in {
    packages.${system}.default = substrateLib.mkCrate2nixProject { ... };
    devShells.${system}.default = substrateLib.mkDevShell { ... };
  };
}

Import patterns

Via substrate.lib.${system} (recommended):

substrateLib = substrate.lib.${system};
packages.default = substrateLib.mkCrate2nixProject { ... };

Via substrate.libFor (when you need to pass forge):

substrateLib = substrate.libFor {
  inherit pkgs system;
  forge = inputs.forge.packages.${system}.forge;
};

Standalone flake builders (zero boilerplate):

# Rust tool:
outputs = (import "${substrate}/lib/build/rust/tool-release-flake.nix" {
  inherit nixpkgs crate2nix flake-utils;
}) { toolName = "kindling"; src = self; repo = "pleme-io/kindling"; };

# Ruby gem:
outputs = (import "${substrate}/lib/build/ruby/gem-flake.nix" {
  inherit nixpkgs ruby-nix flake-utils substrate forge;
}) { inherit self; name = "pangea-core"; };

# Pangea infra:
outputs = (import "${substrate}/lib/infra/pangea-infra-flake.nix" {
  inherit nixpkgs ruby-nix flake-utils substrate forge;
}) { inherit self; name = "my-infra"; };

Standalone home-manager helpers (no pkgs needed):

hmHelpers = import "${substrate}/lib/hm/service-helpers.nix" { lib = nixpkgs.lib; };
skillHelpers = import "${substrate}/lib/hm/skill-helpers.nix" { lib = nixpkgs.lib; };
mcpHelpers = import "${substrate}/lib/hm/mcp-helpers.nix" { lib = nixpkgs.lib; };

High-level Rust service (single-function interface):

let rustService = import "${substrate}/lib/build/rust/service.nix" {
  inherit system nixpkgs;
  nixLib = substrate;
  crate2nix = inputs.crate2nix;
  forge = inputs.forge.packages.${system}.forge;
};
in rustService {
  serviceName = "email";
  src = ./.;
  productName = "myapp";
  registryBase = "ghcr.io/myorg";
  enableAwsSdk = true;
}
# Returns: { packages, devShells, apps }

API Reference

Build

Function Source Description
mkRustOverlay build/rust/overlay.nix Fenix stable overlay for crate2nix
mkGoOverlay build/go/overlay.nix Go from upstream source
mkZigOverlay build/zig/overlay.nix Prebuilt Zig + source zls
mkSwiftOverlay build/swift/overlay.nix Swift 6 from swift.org (Darwin)
mkCrate2nixProject build/rust/crate2nix-builders.nix Per-crate cached Rust build
mkCrate2nixDockerImage build/rust/crate2nix-builders.nix Multi-arch Docker image
mkCrate2nixServiceApps build/rust/crate2nix-apps.nix Full service app set
mkCrate2nixTool build/rust/crate2nix-builders.nix Standalone Rust CLI tools
mkCrate2nixTestImage build/rust/crate2nix-builders.nix Test runner image for CI
mkGoTool build/go/tool.nix Go CLI tool builder
mkGoMonorepoSource build/go/monorepo.nix Shared Go monorepo source
mkGoMonorepoBinary build/go/monorepo-binary.nix Binary from Go monorepo
mkViteBuild build/web/build.nix Vite/React builds
mkDream2nixBuild build/web/build.nix NPM with dream2nix
mkTypescriptToolAuto build/typescript/tool.nix Auto-discover TS tool
mkTypescriptTool build/typescript/tool.nix TS CLI tool with pleme-linker
mkTypescriptPackage build/typescript/library.nix TS library package
mkRubyDockerImage build/ruby/build.nix Ruby Docker image
mkPythonPackage build/python/package.nix Python package builder
mkUvPythonPackage build/python/uv.nix UV + pyproject.toml
mkDotnetPackage build/dotnet/build.nix .NET package builder
mkJavaMavenPackage build/java/maven.nix Maven package builder
mkWasmBuild build/wasm/build.nix Yew/WASM builds
mkLeptosBuild build/rust/leptos-build.nix Leptos SSR+CSR dual-target
mkLeptosDockerImage build/rust/leptos-build.nix Docker for Leptos SSR
mkGitHubAction build/web/github-action.nix GitHub Action builder

Service

Function Source Description
mkServiceApps service/helpers.nix Docker compose + deployment
mkEnvironmentServiceApps service/environment-apps.nix Env-aware deployments
mkProductSdlcApps service/product-sdlc.nix Full SDLC app factory
mkPlatformService service/platform-service.nix Complete platform service
mkImageReleaseApp service/image-release.nix Multi-arch OCI release
mkHelmSdlcApps service/helm-build.nix Helm chart lifecycle
mkHealthSupervisor service/health-supervisor.nix Health check builder
mkMigrationJob service/db-migration.nix K8s migration Job manifest

Infrastructure

Function Source Description
pangeaInfraBuilder infra/pangea-infra.nix Pangea project builder
pangeaInfraFlakeBuilder infra/pangea-infra-flake.nix Pangea flake wrapper
mkTerraformModuleCheck infra/terraform-module.nix TF validation derivation
mkPulumiProvider infra/pulumi-provider.nix Pulumi SDK generation (5 languages)
mkAnsibleCollection infra/ansible-collection.nix Ansible Galaxy packaging

Home-Manager

Function Source Description
hmServiceHelpers hm/service-helpers.nix launchd/systemd patterns
hmSkillHelpers hm/skill-helpers.nix Claude Code skill deploy
hmMcpHelpers hm/mcp-helpers.nix MCP server management
hmTypedConfigHelpers hm/typed-config-helpers.nix Typed config generation
nixosServiceHelpers hm/nixos-service-helpers.nix NixOS module patterns
testHelpers util/test-helpers.nix Pure Nix eval tests

Utility

Function Source Description
mkDarwinBuildInputs util/darwin.nix macOS SDK deps
mkRuntimeToolsEnv util/config.nix Runtime tool env vars
mkVersionedOverlay util/versioned-overlay.nix N-track overlay gen
repoFlakeBuilder util/repo-flake.nix Universal flake builder
monorepoPartsModule util/monorepo-parts.nix flake-parts module

Codegen

Function Source Description
mkOpenApiForge codegen/openapi-forge.nix OpenAPI parsing + forge
mkOpenApiSdk codegen/openapi-sdk.nix Multi-language SDK gen
mkOpenApiRustSdk codegen/openapi-rust-sdk.nix Rust SDK gen

Type System

Export Source Description
substrateTypes types/default.nix Complete type lattice (instantiated)
substrateTypesPath types/ Standalone import path (no pkgs)
substrateTypes.foundation types/foundation.nix 19 enums + refined primitives
substrateTypes.ports types/ports.nix Unified ports with coercion
substrateTypes.buildResult types/build-result.nix Universal output contract
substrateTypes.buildSpec types/build-spec.nix Per-language input specs
substrateTypes.validate types/validate.nix Builder wrapping middleware
substrateTypes.convergence types/convergence.nix Stage typestate machine
substrateTypes.assertions types/assertions.nix Assertion guard library

Typed Builder Wrappers

Export Source Description
rustServiceTypedBuilder build/rust/service-typed.nix Module-validated Rust service
rustToolReleaseTypedBuilder build/rust/tool-release-typed.nix Module-validated Rust tool
rustWorkspaceReleaseTypedBuilder build/rust/workspace-release-typed.nix Module-validated workspace
goGrpcServiceTypedBuilder build/go/grpc-service-typed.nix Module-validated Go gRPC

Shared Middleware

Export Source Description
mkTypedDockerImage build/shared/docker-image.nix Universal Docker image builder
mkReleaseApps build/shared/release-app.nix Shared release/bump/check-all
mkTypedDevShell build/shared/devshell.nix Universal devShell factory

Backward Compatibility

All old flat paths (lib/rust-overlay.nix, lib/go-tool.nix, etc.) are preserved as one-line shims that forward to the new location:

# lib/rust-overlay.nix
# Shim -- moved to build/rust/overlay.nix
import ./build/rust/overlay.nix

Rules:

  • Shims are never removed. External consumers depend on the old paths.
  • New code should use the new paths (lib/build/rust/overlay.nix).
  • The default.nix public API (attribute names) is unchanged.

See docs/migration.md for the full old-to-new path mapping.

Configuration

Tokens

export ATTIC_TOKEN="your-attic-jwt-token"
export GHCR_TOKEN="your-github-token"

Forge

Pass the deployment orchestrator via forge parameter:

substrateLib = substrate.libFor {
  inherit pkgs system;
  forge = inputs.forge.packages.${system}.forge;
};

When forge is not provided, commands fall back to looking for forge on $PATH.

Scaffold System -- Generate Complete Projects

Scaffolds implement convergence computing: declare intent, scaffold converges it into a complete project. Each scaffold matches a builder.

scaffold = import "${substrate}/lib/leptos-app-scaffold.nix" { inherit lib; };
app = scaffold.generate ({
  name = "my-product";
  primaryColor = "#6366f1";
} // scaffold.templates.standard);
# app.files -- 22 files ready to write to disk
# app.meta -- project metadata  
# app.deployment -- deployment spec for substrate archetypes
Scaffold Builder What It Generates
leptosAppScaffold leptosBuildFlakeBuilder Leptos PWA (22 files, auth + PWA + i18n)
rustServiceScaffold rustServiceFlakeBuilder Axum backend (GraphQL/REST, DB, health)
rustToolScaffold rustToolReleaseFlakeBuilder Clap CLI (config, completions)
dioxusAppScaffold -- Dioxus desktop/mobile app
gpuAppScaffold -- garasu+egaku+madori GPU app
rubyGemScaffold rubyGemFlakeBuilder Pangea IaC gem (RSpec)

See docs/scaffolds.md for all templates and options.

Leptos Web Application Builders

Dual-target Leptos builds: SSR native binary + CSR WASM bundle.

Function Source Description
mkLeptosBuild build/rust/leptos-build.nix SSR binary + CSR WASM + combined
mkLeptosDockerImage build/rust/leptos-build.nix Docker with SSR serving CSR
mkLeptosDockerImageWithHanabi build/rust/leptos-build.nix CSR-only via Hanabi BFF
leptosBuildFlakeBuilder build/rust/leptos-build-flake.nix Zero-boilerplate flake

Devenv module: lib/devenv/leptos.nix (cargo-leptos, trunk, tailwindcss, wasm-bindgen, npm).

See docs/adding-a-leptos-app.md.

Unified Infrastructure Theory

Abstract workload archetypes render simultaneously to Kubernetes, Tatara, WASI, and any custom backend via the extensible renderer interface:

svc = archetypes.mkHttpService {
  name = "my-app"; image = "ghcr.io/org/app:latest";
  ports = [{ name = "http"; port = 3000; }];
  health = { path = "/healthz"; };
  exports = [{ protocol = "http"; port = 3000; }];  # bilateral promise
};
# svc.spec.attestation.signature -- SHA-256 proof of well-typed spec
# svc.kubernetes -- nix-kube compositions + attestation annotations
# svc.tatara -- JobSpec JSON + attestation metadata
# svc.wasi -- WASI Component Model config + attestation

# Extensible: add a custom backend without touching core code
svc = archetypes.mkHttpServiceWith {
  compose = { render = spec: mkDockerCompose spec; };
} { name = "my-app"; ... };
# svc.compose -- Docker Compose config from custom renderer

7 archetypes: mkHttpService, mkWorker, mkCronJob, mkGateway, mkStatefulService, mkFunction, mkFrontend. Each has a mk*With variant accepting additional renderers.

See docs/unified-infrastructure-theory.md and docs/metaframework.md.

Metaframework

Substrate powers the pleme-io metaframework: declare application state once, render through any backend (garasu GPU or Leptos web), deploy to any platform.

Framework crates powered by substrate:

  • pleme-app-core -- state machines, cache, sanitization, convergence types + Leptos web providers
  • pleme-mui -- 92 Material Web + MUI island components for Leptos
  • egaku -- platform-agnostic widget state machines (pure Rust, WASM-safe)
  • irodori -- color system (source of truth for theming)

See docs/metaframework.md and docs/convergence-application-theory.md.

Test Battery

362+ pure eval tests across 9 suites. Run all:

nix eval --impure --expr '(import ./lib/types/tests.nix { lib = (import <nixpkgs> {}).lib; }).summary'
nix eval --impure --expr '(import ./lib/types/assertion-tests.nix).summary'
nix eval --impure --expr '(import ./lib/types/property-tests.nix).testConvergenceStages.summary'
nix eval --impure --expr '(import ./lib/types/property-tests.nix).testInformationFlow.summary'
nix eval --impure --expr '(import ./lib/infra/tests/convergence-improvements-test.nix).summary'
nix eval --impure --expr '(import ./lib/kube/tests.nix).allPassed'
nix eval --impure --expr '(import ./lib/infra/tests.nix).summary'
nix eval --impure --expr '(import ./lib/hm/tests.nix).summary'
nix eval --impure --expr '(import ./lib/util/tests.nix).summary'
Suite Tests What it proves
Types 79 Every type, coercion, enum rejects invalid input
Assertions 47 Every assertion function accepts valid, rejects invalid
Convergence stages 10 Stage transitions correct, invalid transitions throw
Information flow 8 Secrets cannot leak into plain env
Improvements 26 All 8 academic improvements work end-to-end
Kube 37+ All K8s primitives produce valid manifests
Infra 105 All infra builders produce correct output
HM 65 All home-manager helpers work correctly
Util 22 Utility functions work correctly

Further Reading

License

MIT License - see LICENSE for details.

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Opinionated Nix build substrate — the underlying layer that defines how all services and products are built

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