Function executeCmd

lib/util/cmd.js:57–123

(command, args, options)

// Returns a promise that gets fulfilled if the command succeeds
// or rejected if it fails
function executeCmd(command, args, options) {
    var process;
    var stderr = '';
    var stdout = '';
    var deferred = Q.defer();

    // Windows workaround for .bat and .cmd files, see #626
    if (isWin) {
        command = getWindowsCommand(command);
    }

    // Buffer output, reporting progress
    process = cp.spawn(command, args, options);
    process.stdout.on('data', function(data) {
        data = data.toString();
        deferred.notify(data);
        stdout += data;
    });
    process.stderr.on('data', function(data) {
        data = data.toString();
        deferred.notify(data);
        stderr += data;
    });

    // If there is an error spawning the command, reject the promise
    process.on('error', function(error) {
        return deferred.reject(error);
    });

    // Listen to the close event instead of exit
    // They are similar but close ensures that streams are flushed
    process.on('close', function(code) {
        var fullCommand;
        var error;

        if (code) {
            // Generate the full command to be presented in the error message
            if (!Array.isArray(args)) {
                args = [];
            }

            fullCommand = command;
            fullCommand += args.length ? ' ' + args.join(' ') : '';

            // Build the error instance
            error = createError(
                'Failed to execute "' +
                    fullCommand +
                    '", exit code of #' +
                    code +
                    '\n' +
                    stderr,
                'ECMDERR',
                {
                    details: stderr,
                    exitCode: code
                }
            );