mcopy/app/lib/exec/index.js

44 lines
1.3 KiB
JavaScript

'use strict';
const execRaw = require('child_process').exec;
/**
* Promisified child_process.exec
*
* @param cmd
* @param arg
* @param opts See child_process.exec node docs
* @param {stream.Writable} opts.stdout If defined, child process stdout will be piped to it.
* @param {stream.Writable} opts.stderr If defined, child process stderr will be piped to it.
*
* @returns {Promise<{ stdout: string, stderr: stderr }>}
*/
async function exec(...args) {
let cmd = args[0];
let argz = null;
let opts = null;
if (typeof args[1] === 'object' && Array.isArray(args[1])) {
argz = args[1];
}
if (argz === null && typeof args[1] === 'object') {
opts = args[1];
}
else if (typeof args[2] === 'object') {
opts = args[2];
}
if (opts === null) {
opts = { maxBuffer: 1024 * 1024 };
}
return new Promise((resolve, reject) => {
const child = execRaw(cmd, opts, (err, stdout, stderr) => err ? reject(err) : resolve({
stdout,
stderr
}));
if (opts.stdout) {
child.stdout.pipe(opts.stdout);
}
if (opts.stderr) {
child.stderr.pipe(opts.stderr);
}
});
}
module.exports.exec = exec;
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