OSX RAM Disk

ramdisk

#!/usr/bin/env node
"use strict";
const shell = require("child_process").exec;

function byteSize(strSize){
	if(!strSize.match(/[0-9]+[bBkKMmGgTt]/)) { throw "Invalid Size Parameter: byteSize(\"" + strSize + "\")"; }
	if(strSize.length < 2){ return strSize; }
	const unit = strSize[strSize.length-1].toLowerCase();
	const amount = parseInt(strSize.substr(0, strSize.length-1));
	switch(unit){
		case "b": return amount;
		case "k": return amount * 1024;
		case "m": return amount * 1048576;
		case "g": return amount * 1073741824;
		case "t": return amount * 1099511627776;
		default: return parseInt(strSize);
	}
}

function sectorSize(strSize){
	return byteSize(strSize) / 512;
}

function _rdEject(){
	shell("hdiutil eject " + global.device, function(err){
		if(err !== null){
			console.error("### Error Ejecting Device \"" + global.device + "\"; May Need Manual Ejection. ###");
			console.error(err);
		}
		process.exit(-1);
	});
}

function _rdFormat(){
	shell("diskutil erasevolume HFS+ \"" + global.label + "\" " + global.device, function(err){
		if(err !== null){
			console.error("### Error Formatting RAM Disk; Attempting Cleanup. ###");
			console.error(err);
			_rdEject();
		}
		console.log("### Mounted New RAM Disk Device \"" + global.device + "\", Named \"" + global.label + "\". ###");
		process.exit(0);
	});
}

function rdCreate(){
	shell("hdiutil attach -nomount ram://" + global.sectors, function(err, out){
		if(err !== null){
			console.error("### Error Creating RAM Disk. ###");
			console.error(err);
			process.exit(-1);
		}
		global.device = out.trim();
		_rdFormat();
	});
}

if(process.argv.length < 3){
	console.error("### Error: No Size Specified. ###");
	process.exit(-1);
}

global.sectors = sectorSize(process.argv[2]);
global.label = (process.argv.length < 4) ? "RamDisk" : process.argv[3];
rdCreate();