Shared GitHub Actions for CNB Releases (#1)

* Shared GitHub Actions for CNB Releases

Initial commit of shared workflows and actions for release automation tasks for Cloud-native Buildpacks.

.editorconfig

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+root = true
+
+[*]
+insert_final_newline = true
+trim_trailing_whitespace = true

.github/CODEOWNERS

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+* @heroku/languages

.github/actions/generate-buildpack-matrix/action.yml

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+name: Generate Buildpack Matrix
+description: "Generates a list of buildpacks containing id and path keys for use in a matrix strategy `include` list"
+
+outputs:
+  buildpacks:
+    description: The list of buildpack (id, path) keys formatted as a JSON array
+
+runs:
+  using: node16
+  main: index.js

.github/actions/generate-buildpack-matrix/index.js

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+require('../../bootstrap').invokeWith(() => {
+    return ['generate-buildpack-matrix']
+})

.github/actions/generate-changelog/action.yml

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+name: Generate Changelog
+description: "Generates a changelog from one or more buildpacks in a project"
+
+inputs:
+  unreleased:
+    description: If the changelog should be generated from the unreleased section
+    required: false
+  version:
+    description: If the changelog should be generated from a version section
+    required: false
+
+outputs:
+  changelog:
+    description: Markdown content listing the changes
+
+runs:
+  using: node16
+  main: index.js

.github/actions/generate-changelog/index.js

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+require('../../bootstrap').invokeWith(({ getInput }) => {
+    const args = ['generate-changelog'];
+
+    if (getInput('unreleased')) {
+        args.push('--unreleased')
+    } else if (getInput('version')) {
+        args.push('--version')
+        args.push(getInput('version'))
+    }
+
+    return args
+})

.github/actions/prepare-release/action.yml

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+name: Prepare Buildpack Release
+description: "Prepares a buildpack release by bumping the fixed version and updating changelogs"
+
+inputs:
+  bump:
+    description: Which coordinate should be incremented? (major, minor, patch)
+    required: true
+  repository_url:
+    description: The URL of the repository (e.g.; https://github.com/octocat/Hello-World)
+    default: https://github.com/${{ github.repository }}
+
+outputs:
+  from_version:
+    description: The previous version
+  to_version:
+    description: The next version
+
+runs:
+  using: node16
+  main: index.js

.github/actions/prepare-release/index.js

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+require('../../bootstrap').invokeWith(({ getInput }) => {
+    return [
+        'prepare-release',
+
+        '--bump',
+        getInput('bump', { required: true }),
+
+        '--repository-url',
+        getInput('repository_url')
+    ]
+})

.github/actions/update-builder/action.yml

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+name: Update Builder
+description: "Prepares a buildpack release by bumping the fixed version and updating changelogs"
+
+inputs:
+  buildpack_id:
+    description: The id of the buildpack
+    required: true
+  buildpack_version:
+    description: The version of the buildpack
+    required: true
+  buildpack_uri:
+    description: The URI of the published buildpack
+    required: true
+  builders:
+    description: A comma-separated list of builders to update
+    required: true
+  path:
+    description: Relative path under $GITHUB_WORKSPACE to execute in
+
+runs:
+  using: node16
+  main: index.js

.github/actions/update-builder/index.js

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+require('../../bootstrap').invokeWith(({ getInput }) => {
+    return [
+        'update-builder',
+
+        '--path',
+        getInput('path', { required: true }),
+
+        '--buildpack-id',
+        getInput('buildpack_id', { required: true }),
+
+        '--buildpack-version',
+        getInput('buildpack_version', { required: true }),
+
+        '--buildpack-uri',
+        getInput('buildpack_uri', { required: true }),
+
+        '--builders',
+        getInput('builders', { required: true }),
+    ]
+})

.github/bootstrap/bootstrap.ts

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+/**
+ * IMPORTANT! If you change this file be sure to regenerate the compiled version with `npm run build`
+ */
+
+"use strict";
+
+import { readFileSync } from "node:fs"
+import { join } from "node:path"
+import { parse as urlParse } from "node:url"
+
+import { setFailed, getInput, getBooleanInput, getMultilineInput, startGroup, endGroup, info } from "@actions/core"
+import { exec } from "@actions/exec"
+import { find, cacheFile, downloadTool, extractTar } from "@actions/tool-cache"
+import { parse as tomlParse } from 'toml'
+
+type GetArguments = (inputs: {
+    getInput: typeof getInput,
+    getBooleanInput: typeof getBooleanInput,
+    getMultilineInput: typeof getMultilineInput
+}) => string[]
+
+export function invokeWith(getArgs: GetArguments) {
+    executeRustBinaryAction(getArgs).catch(e => {
+        if (e instanceof Error) {
+            setFailed(e.message)
+        }
+    })
+}
+
+async function executeRustBinaryAction(getArgs: GetArguments) {
+    startGroup('Bootstrapping');
+
+    const { platform, env } = process
+    const tempDirectory = env.RUNNER_TEMP
+
+    if (platform !== 'win32' && platform !== 'darwin' && platform !== 'linux') {
+        throw new Error(`Unsupported platform: ${platform}`)
+    }
+
+    const toml = tomlParse(readFileSync(join(__dirname, "../../Cargo.toml"), 'utf-8'))
+
+    const { name } = toml.bin[0]
+    info(`name: ${name}`)
+
+    const { repository, version } = toml.package
+    info(`version: ${version}\nrepository: ${repository}`)
+
+    const binaryName = platform === 'win32' ? `${name}.exe` : name;
+    info(`binaryName: ${binaryName}`)
+
+    const githubOrgAndName = urlParse(repository).pathname
+        .replace(/^\//, '')
+        .replace(/\.git$/, '')
+
+    // now we should be able to build up our download url which looks something like this:
+    // https://github.com/heroku/languages-github-actions/releases/download/v0.0.0/actions-v0.0.0-darwin-x64.tar.gz
+    const releaseUrl = `https://github.com/${githubOrgAndName}/releases/download/v${version}/${name}-v${version}-${platform}-x64.tar.gz`;
+    info(`releaseUrl: ${releaseUrl}`)
+
+    let cachedPath = find(githubOrgAndName, version)
+    info(`is cached: ${cachedPath ? true : false}`)
+    if (!cachedPath) {
+        const downloadPath = await downloadTool(releaseUrl)
+        info(`downloadPath: ${downloadPath}`)
+
+        const extractPath = await extractTar(downloadPath, tempDirectory)
+        info(`extractPath: ${extractPath}`)
+
+        const extractedFile = join(extractPath, binaryName)
+        info(`extractedFile: ${extractedFile}`)
+
+        cachedPath = await cacheFile(extractedFile, binaryName, githubOrgAndName, version)
+    }
+    info(`using cache path: ${cachedPath}`)
+
+    const rustBinary = join(cachedPath, name);
+    info(`using binary: ${rustBinary}`)
+
+    const args = getArgs({ getInput, getBooleanInput, getMultilineInput });
+    info(`using args: ${args.join(" ")}`)
+
+    endGroup()
+
+    await exec(rustBinary, args);
+}