index.js

#!/usr/bin/env node
const child_process = require("child_process");

// This version of ganache is required globally.
const requiredGanache = "ganache-cli@6.1.3";

const scriptsDir = `${__dirname}/scripts`;
const dataDir = `${__dirname}/data`;

console.log("Checking Ganache Version...");

console.log("Running:", `npm list ${requiredGanache} -g || npm install ${requiredGanache} -g`);

const installGanacheProcess = child_process.exec(
    `npm list ${requiredGanache} -g || npm install ${requiredGanache} -g`,
    (error, stdout, stderr) => {
        if (stdout) {
            console.log("Found ganache-cli:", stdout);
        }

        if (stderr) {
            console.log("stderr:", stderr);
        }

        if (error !== null) {
            console.log(`exec error: ${error}`);
        }
    }
);

// Once we have installed Ganache-CLI, we can init a chain and migrate the contracts.
installGanacheProcess.on("exit", async () => {
    console.log("Replacing working data with pristine blockchain state");
    child_process.exec(`rm -r ${dataDir}/working; cp -r ${dataDir}/pristine ${dataDir}/working`, () => {
        const initChainProcess = child_process.spawn(`${scriptsDir}/init_chain.sh`);
        const mineBlockProcess = child_process.spawn(`${scriptsDir}/mine_block.sh`);

        // True once ganache-cli has begun.
        let chainStarted = false;

        initChainProcess.on("exit", function (code, signal) {
            if (!chainStarted) {
                console.error(`Local blockchain (running on ganache-cli) failed to start!`);
            }

            console.error(`Local blockchain (ganache-cli) exited with code ${code} and signal ${signal}`);
        });

        initChainProcess.stdout.on("data", function (data) {
            chainStarted = true;
            console.log(data.toString());
        });

        mineBlockProcess.stdout.on("data", function (data) {
            console.log(data.toString());
        });

        process.on("exit", () => {
            initChainProcess.kill();
            mineBlockProcess.kill();
        });
    });
});