gcbuild/build/src/config.js

An API and CLI for building docker containers with Google Cloud Build.

import fs from 'node:fs';
import path from 'node:path';
import yaml from 'js-yaml';
export async function getConfig(options) {
    // If no config path was provided, work through the following set of default
    // paths looking for some kind of config:
    // 1. cloudbuild.yaml
    // 2. cloudbuild.json
    // 3. Dockerfile
    if (!options.configPath) {
        const files = ['cloudbuild.yaml', 'cloudbuild.json', 'Dockerfile'];
        for (const file of files) {
            const fullpath = path.join(options.sourcePath, file);
            const fileExists = await exists(fullpath);
            if (fileExists) {
                options.configPath = fullpath;
                break;
            }
        }
    }
    if (!options.configPath) {
        throw new Error(`
      Unable to find configuration file. Please provide a cloudbuild.yaml,
      cloudbuild.json, or Dockerfile in the source directory.`);
    }
    let config;
    if (path.basename(options.configPath) === 'Dockerfile') {
        options.tag ||= path.basename(options.sourcePath);
        config = {
            steps: [
                {
                    name: 'gcr.io/cloud-builders/docker',
                    args: [
                        'build',
                        '-t',
                        `gcr.io/${options.projectId}/${options.tag}`,
                        '.',
                    ],
                },
            ],
            images: [`gcr.io/${options.projectId}/${options.tag}`],
        };
    }
    else {
        const configFileContents = await fs.promises.readFile(options.configPath, 'utf8');
        const extension = path.extname(options.configPath);
        switch (extension) {
            case '.json': {
                config = JSON.parse(configFileContents);
                break;
            }
            case '.yaml': {
                config = (await yaml.load(configFileContents));
                break;
            }
            default: {
                throw new Error(`The ${extension} extension is not supported.  Please pass yaml or json.`);
            }
        }
    }
    return config;
}
/**
 * Check if a file exists async
 * @param file path to the file to check
 */
async function exists(file) {
    try {
        await fs.promises.access(file, fs.constants.F_OK);
        return true;
    }
    catch {
        return false;
    }
}