dependencies.js

const hasbin = require('hasbin');

const providers = Object.keys(require('./providers'));

const { error } = require('./logger');

const depMap = {
    'build': [
        () => mustBin('cpio'),
        () => mustBin('docker'),
        () => mustBin('gzip'),
        () => mustBin('mkisofs'),
    ],
    'delete': [],
    'images': [],
    'run': [],
    'vms': []
}

const mustBin = bin => {
    if (!hasbin.sync(bin)) throw `You must have ${bin} installed to build a microkernel`;
}

exports.check = argv => {
    let cmd = argv._[0];

    try {
        if (providers.length === 0) {
            throw 'You don\'t have any providers installed! Please see the docs for a list of supported providers';
        }

        let { provider } = argv;
        if (provider && providers.indexOf(provider) === -1) {
            throw `Provider ${provider} is not installed! Please see the docs for a list of supported providers`;
        }

        depMap[cmd].forEach(d => d(argv));
    } catch (e) {
        error(e);
        process.exit(1);
    }
};