Initial (stub) implementation of heroku/nodejs-pnpm-engine

Cargo.toml

@@ -6,6 +6,7 @@ members = [
   "buildpacks/nodejs-function-invoker",
   "buildpacks/nodejs-npm-engine",
   "buildpacks/nodejs-npm-install",
+  "buildpacks/nodejs-pnpm-engine",
   "buildpacks/nodejs-pnpm-install",
   "buildpacks/nodejs-yarn",
   "common/nodejs-utils",

buildpacks/nodejs-pnpm-engine/CHANGELOG.md

@@ -0,0 +1,14 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Initial release
+
+[unreleased]: https://github.com/heroku/buildpacks-nodejs/compare/v2.5.0...HEAD

buildpacks/nodejs-pnpm-engine/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "heroku-pnpm-engine-buildpack"
+description = "Heroku Node.js pnpm Engine Cloud Native Buildpack"
+version.workspace = true
+rust-version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[lints]
+workspace = true
+
+[dependencies]
+commons = { git = "https://github.com/heroku/buildpacks-ruby", branch = "main" }
+indoc = "2"
+libcnb = { version = "=0.17.0", features = ["trace"] }
+
+[dev-dependencies]
+libcnb-test = "=0.17.0"
+test_support.workspace = true

buildpacks/nodejs-pnpm-engine/README.md

@@ -0,0 +1,47 @@
+# Heroku Cloud Native pnpm Engine Buildpack
+
+[![CI][CI BADGE]][CI LINK] [![Registry][Registry BADGE]][Registry LINK]
+
+Heroku's official Cloud Native Buildpack for installing a version of `pnpm`.
+
+> [!IMPORTANT]
+> This buildpack is a stub implementation, and does not yet install `pnpm`.
+> To install `pnpm` during a build, use [heroku/nodejs-corepack] instead.
+
+## How it works
+
+The buildpack will pass detection if:
+
+- A `pnpm-lock.yaml` file is found at the root of the application source.
+
+The buildpack will not install `pnpm`, yet. This buildpack will recommend using
+`corepack` to install `pnpm` via the [heroku/nodejs-corepack](heroku/nodejs-corepack)
+buildpack.
+
+## Build Plan
+
+### Requires
+
+| Name           | Description                                                                                                                                     |
+|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
+| `node`         | To install `pnpm` a [Node.js][Node.js] runtime is required. It can be provided by the [`heroku/nodejs-engine`][heroku/nodejs-engine] buildpack. |
+
+### Provides
+
+| Name   | Description                                                                            |
+|--------|----------------------------------------------------------------------------------------|
+| `pnpm` | Allows other buildpacks that require [pnpm][pnpm] tooling to depend on this buildpack. |
+
+## License
+
+See [LICENSE](../../LICENSE) file.
+
+[CI BADGE]: https://github.com/heroku/buildpacks-nodejs/actions/workflows/ci.yml/badge.svg
+[CI LINK]: https://github.com/heroku/buildpacks-nodejs/actions/workflows/ci.yml
+[Registry BADGE]: https://img.shields.io/badge/dynamic/json?url=https://registry.buildpacks.io/api/v1/buildpacks/heroku/nodejs-pnpm-engine&label=version&query=$.latest.version&color=DF0A6B&logo=data:image/png;base64,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&labelColor=white
+[Registry LINK]: https://registry.buildpacks.io/buildpacks/heroku/nodejs-pnpm-engine
+[Node.js]: https://nodejs.org/
+[pnpm]: https://pnpm.io/
+[heroku/nodejs-engine]: ../nodejs-engine/README.md
+[heroku/nodejs-corepack]: ../nodejs-corepack/README.md
+

buildpacks/nodejs-pnpm-engine/buildpack.toml

@@ -0,0 +1,18 @@
+api = "0.9"
+
+[buildpack]
+id = "heroku/nodejs-pnpm-engine"
+version = "2.5.0"
+name = "Heroku Node.js pnpm Engine"
+homepage = "https://github.com/heroku/buildpacks-nodejs"
+description = "Heroku's Node.js pnpm Engine buildpack. A component of the 'heroku/nodejs' buildpack."
+keywords = ["pnpm", "heroku"]
+
+[[buildpack.licenses]]
+type = "MIT"
+
+[[stacks]]
+id = "*"
+
+[metadata.release]
+image = { repository = "docker.io/heroku/buildpack-nodejs-pnpm-engine" }

buildpacks/nodejs-pnpm-engine/src/errors.rs

@@ -0,0 +1,85 @@
+use crate::BUILDPACK_NAME;
+use commons::output::build_log::{BuildLog, Logger, StartedLogger};
+use commons::output::fmt;
+use commons::output::fmt::DEBUG_INFO;
+use indoc::formatdoc;
+use std::fmt::Display;
+use std::io::stdout;
+
+#[derive(Debug, Copy, Clone)]
+pub(crate) enum PnpmEngineBuildpackError {
+    CorepackRequired,
+}
+
+pub(crate) fn on_error(error: libcnb::Error<PnpmEngineBuildpackError>) {
+    let logger = BuildLog::new(stdout()).without_buildpack_name();
+    match error {
+        libcnb::Error::BuildpackError(buildpack_error) => {
+            on_buildpack_error(buildpack_error, logger);
+        }
+        framework_error => on_framework_error(&framework_error, logger),
+    }
+}
+
+fn on_buildpack_error(error: PnpmEngineBuildpackError, logger: Box<dyn StartedLogger>) {
+    match error {
+        PnpmEngineBuildpackError::CorepackRequired => {
+            print_error_details(logger, &"Corepack Requirement Error")
+                .announce()
+                .error(&formatdoc! {"
+                    A pnpm lockfile ({pnpm_lockfile}) was detected, but the
+                    version of {pnpm} to install could not be determined.
+
+                    {pnpm} may be installed via the {heroku_nodejs_corepack}
+                    buildpack. It requires the desired {pnpm} version to be set
+                    via the {package_manager} key in {package_json}.
+
+                    To set {package_manager} in {package_json} to the latest
+                    {pnpm}, run:
+
+                    {corepack_enable}
+                    {corepack_use_pnpm}
+
+                    Then commit the result, and try again.
+                ",
+                corepack_enable = fmt::command("corepack enable"),
+                corepack_use_pnpm = fmt::command("corepack use pnpm@*"),
+                heroku_nodejs_corepack = fmt::command("heroku/nodejs-corepack"),
+                package_manager = fmt::value("packageManager"),
+                pnpm = fmt::value("pnpm"),
+                pnpm_lockfile = fmt::value("pnpm-lock.yaml"),
+                package_json = fmt::value("package.json")});
+        }
+    }
+}
+
+fn on_framework_error(
+    error: &libcnb::Error<PnpmEngineBuildpackError>,
+    logger: Box<dyn StartedLogger>,
+) {
+    print_error_details(logger, &error)
+        .announce()
+        .error(&formatdoc! {"
+            {buildpack_name} internal error.
+
+            The framework used by this buildpack encountered an unexpected error.
+
+            If you can't deploy to Heroku due to this issue, check the official Heroku Status page at \
+            status.heroku.com for any ongoing incidents. After all incidents resolve, retry your build.
+
+            If the issue persists and you think you found a bug in the buildpack or framework, reproduce \
+            the issue locally with a minimal example. Open an issue in the buildpack's GitHub repository \
+            and include the details.
+
+        ", buildpack_name = fmt::value(BUILDPACK_NAME) });
+}
+
+fn print_error_details(
+    logger: Box<dyn StartedLogger>,
+    error: &impl Display,
+) -> Box<dyn StartedLogger> {
+    logger
+        .section(DEBUG_INFO)
+        .step(&error.to_string())
+        .end_section()
+}

buildpacks/nodejs-pnpm-engine/src/main.rs

@@ -0,0 +1,55 @@
+mod errors;
+
+use crate::errors::PnpmEngineBuildpackError;
+use libcnb::build::{BuildContext, BuildResult};
+use libcnb::data::build_plan::BuildPlanBuilder;
+use libcnb::detect::{DetectContext, DetectResult, DetectResultBuilder};
+use libcnb::generic::{GenericMetadata, GenericPlatform};
+use libcnb::{buildpack_main, Buildpack};
+#[cfg(test)]
+use libcnb_test as _;
+#[cfg(test)]
+use test_support as _;
+
+const BUILDPACK_NAME: &str = "Heroku Node.js pnpm Engine Buildpack";
+
+struct PnpmEngineBuildpack;
+
+impl Buildpack for PnpmEngineBuildpack {
+    type Platform = GenericPlatform;
+    type Metadata = GenericMetadata;
+    type Error = PnpmEngineBuildpackError;
+
+    fn detect(&self, context: DetectContext<Self>) -> libcnb::Result<DetectResult, Self::Error> {
+        // pass detect if a `pnpm-lock.yaml` is found
+        if context.app_dir.join("pnpm-lock.yaml").exists() {
+            return DetectResultBuilder::pass()
+                .build_plan(
+                    BuildPlanBuilder::new()
+                        .provides("pnpm")
+                        .requires("node")
+                        .build(),
+                )
+                .build();
+        }
+        DetectResultBuilder::fail().build()
+    }
+
+    fn build(&self, _context: BuildContext<Self>) -> libcnb::Result<BuildResult, Self::Error> {
+        // This buildpack does not install pnpm yet, suggest using
+        // `heroku/nodejs-corepack` instead.
+        Err(PnpmEngineBuildpackError::CorepackRequired)?
+    }
+
+    fn on_error(&self, error: libcnb::Error<Self::Error>) {
+        errors::on_error(error);
+    }
+}
+
+impl From<PnpmEngineBuildpackError> for libcnb::Error<PnpmEngineBuildpackError> {
+    fn from(value: PnpmEngineBuildpackError) -> Self {
+        libcnb::Error::BuildpackError(value)
+    }
+}
+
+buildpack_main!(PnpmEngineBuildpack);

buildpacks/nodejs-pnpm-engine/tests/fixtures/pnpm-unknown-version/.gitigore

@@ -0,0 +1 @@
+node_modules/

buildpacks/nodejs-pnpm-engine/tests/fixtures/pnpm-unknown-version/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "pnpm-unknown-version",
+  "version": "1.0.0",
+  "dependencies": {
+    "express": "^4.18.2"
+  }
+}