Linux users who want to run Windows applications without switching operating systems have been able to do so for years with Wine, software that lets apps designed for Windows run on Unix-like systems.
There has been no robust equivalent allowing Mac applications to run on Linux, perhaps no surprise given that Windows is far and away the world's most widely used desktop operating system. A developer from Prague named Luboš Doležel is trying to change that with 'Darling,' an emulation layer for OS X.
'The aim is to achieve binary compatible support for Darwin/OS X applications on Linux, plus provide useful tools that will aid especially in application installation,' Doležel's project page states. Darwin is Apple's open source operating system, which provides some of the backend technology in OS X and iOS. The name 'Darling' combines Darwin and Linux. Darling works by 'pars[ing] executable files for the Darwin kernel... load[ing] them into the memory... and execut[ing] them.'
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But there is a ways to go. 'Darling needs to provide an ABI-compatible [application binary interface] set of libraries and frameworks as available on OS X... by either directly mapping functions to those available on Linux, wrapping native functions to bridge the ABI incompatibility, or providing a re-implementation on top of other native APIs,' the project page notes.
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Doležel, who started Darling a year ago, described the project and its progress in an e-mail interview with Ars. Darling is in the early stages, able to run numerous console applications but not much else. 'These are indeed the easiest ones to get working, albeit 'easy' is not the right word to describe the amount of work required to achieve that,' Doležel said. 'Such applications include: Midnight Commander, Bash, VIM, or Apple's GCC [GNU Compiler Collection]. I know it doesn't sound all that great, but it proves that Darling provides a solid base for further work.'
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Users must compile Darling from the source code and then 'use the 'dyld' command to run an OS X executable,' Doležel said. One roadblock is actually getting Mac .dmg and .pkg application files working on a Linux system. Because doing so isn't that straightforward, Doležel said, 'I've written a FUSE module that enables users to mount .dmg files under Linux directly and without root privileges. An installer for .pkg files is underway.'
Unix/Linux synergy
The fact that OS X is a Unix operating system provides advantages in the development process. 'This saved me a lot of work,' Doležel explained. 'Instead of implementing all the 'system' APIs, it was sufficient to create simple wrappers around the ones available on Linux. I had to check every function for ABI compatibility and then test whether my wrapper works, so it wasn't as easy as it may sound.'
Another lucky break not available to Wine developers is that Apple releases some of the low-level components of OS X as open source code, 'which helped a lot with the dynamic loader and Objective-C runtime support code,' Doležel noted.
But of course, the project is an extremely difficult one. Doležel isn't the first to try it, as Darling was initially based on a separate project called 'maloader.' Doležel said he heard from another group of people 'who started a similar project before but abandoned the idea due to lack of time.'
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Doležel was actually a novice to OS X development when he started Darling, being more familiar with OS X from a user's perspective than a developer's perspective. 'I have personally looked for something like Darling before, before I realized I would have to start working on it myself,' he said.
Darling relies heavily on GNUstep, an open source implementation of Apple's Cocoa API. GNUstep provides several core frameworks to Darling, and 'the answer to 'can it run this GUI app?' heavily depends on GNUstep,' Doležel said. Doležel is the only developer of Darling, using up all his spare time on the project.
No reverse-engineering
Doležel isn't reverse-engineering Apple code, noting that it could be problematic in terms of licensing and also that 'disassembling Apple's frameworks wouldn't be helpful at all because Darling and the environment it's running in is layered differently than OS X.'
The development process is a painstaking one, done one application at a time. Doležel explains:
To improve Darling, I first take or write an application I'd like to have running. If it is someone else's application, I first examine it with one of the tools that come with Darling to see what frameworks and APIs it requires. I look up the APIs that are missing in Apple's documentation; then I create stub functions for them and possibly for the rest of the framework, too. (Stub functions only print a warning when they are called but don't do any real work.)
The next step is to implement all the APIs according to the documentation and then see how the application reacts. I also add trace statements into important functions to have an insight into what's happening. I believe this is very much like what Wine developers do.
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When things go wrong, I have to use GDB [GNU Debugger] to debug the original application.
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It is rather unfortunate that Apple's documentation is often so poorly written; sometimes I have to experiment to figure out what the function really does. Many OS X applications seem to contain complete pieces of example code from Apple's documentation, presumably because one would have to spend a lot of time getting to understand how the APIs interact. This is why I appreciate open source so much—when the documentation is sketchy, you can always look into the code.
Years of development are needed. Similar to Wine, 'Having a list of applications known to be working is probably the best way to go,' Doležel said.
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Darling should work on all Linux distributions, he said, with the catch that 'many apps for OS X are 32-bit only, and installing 32-bit packages on a 64-bit Linux system could be tricky depending on your distribution. I personally use Gentoo Linux, so I'm gradually creating a Portage overlay that would compile Darling and all dependencies for both 32-bit and 64-bit applications.'
Doležel would like to bring Angry Birds, other games, and multimedia applications to Linux. Darling could potentially 'be used to run applications compiled for iOS,' he writes on the project site. This will also be a challenge. 'The intention is to support the ARM platform on the lowest levels (the dynamic loader and the Objective-C runtime),' he writes. 'Rewriting the frameworks used on iOS is a whole different story, though.'
The following article is a guide to installing Linux on a Mac PC. Most of the time we opt for Linux operating systems but are confused about the hardware requirements. The tutorial will help you run Linux system on your Mac which will completely replace the original OS. Read on below to find out:Before you begin, you’ll first need to select the distribution you want to work on. Whichever you choose will determine the kind of working environment you want. Some of them include:
- Ubuntu: One of the most popular operating systems built on Unity. It is great for new users and offers a very similar environment as macOS does.
- LinuxMint: Released in 2006, this type is more Window- like and comes in with a range of desktops (Cinnamon, Mate etc.) for Users.
- Debian: This is perfect for people working on the server side. Although, Debian is a little complicated to set up and use, but offers a lot more features than Ubuntu and Mint.
- Fedora Linux: This distro is based on various packages such as DNF, RPM and GNOME. It is not recommended for beginners because of the complex working environment.
Try to get familiar with the distribution you want to install so you don’t have any issues later. We recommend starting with Ubuntu since it is the most used and offers plenty of community support in case if you get stuck somewhere.
Installing Linux on a Mac
Yes, there is an option to run Linux temporarily on a Mac through the virtual box but if you’re looking for a permanent solution, you might want to completely replace the present operating system with a Linux distro.
To install Linux on a Mac, you’ll need a formatted USB drive with storage up to 8GB. Remember this process will wipe out your current macOS/OS X installation and there is probably a very hard chance to recover it back. Also, don’t try to run macOS and Linux on dual boot because that won’t work too.
Follow the steps for installation below:
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- Download Ubuntu or any other Linux distro you want to the Mac. Save it in your Downloads folder.
- Now download and install Etcher, an app that will help copy the Linux installation file to your USB drive. (https://www.balena.io/etcher/)
- Open the app and click on the Settings icon. Tick on the Unsafe Mode and click on Yes, Continue.
- Now Click on SelectImage. Choose the name of the .iso file you downloaded in Step 1.
- Insert your USB Drive
- Under the SelectDrive option, Click Change. Pick the drive option that matches with your USB drive in size. If you have inserted one drive in your Mac, the option will show /dev/disk1. If there are two drives attached, there will be an option for /dev/disk2 and so on. Note that /dev/disk0 is your Mac’s hard drive. Do not select that option.
- Now click Flash to start copying.
- Remove the USB Flash Drive and Shut down your Mac.
- Now attach the USB drive on the Mac again or to any other PC you want to install it to.
- Power up the PC while constantly holding the Option key
- From the start up screen, select the EFI Boot Option
- You will see a screen with Ubuntu Installation Options that will ask you to either Try Ubuntu or Install Ubuntu. Press the letter ‘e’ to go the boot entry.
- Here, you will have to edit the boot entry. Change the line starting with Linux and add the word ‘nomodeset’ after ‘quiet splash’. It should be like this:
- Now, Press F10
- Ubuntu will start booting into trial mode
- Click on the option, ‘Install Ubuntu’
- Select your Language and Continue
- Now, select the option ‘Install this third party software’ and click continue
- Click Yes to the alert option for /dev/sdb
- Now select ‘Erase Disk and Install Ubuntu’ and click on continue
- Make sure you select the main hard drive and click on Install Now.
- Select your location and then click on continue
- Choose your keyboard layout and click on Continue
- Add a name and Password that you want to use
- Click on Continue and your Linux Distro will start installing
- Once the installation is finished, you will be asked to restart your Mac
- Now, login with your name and password to start using Ubuntu.
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Note: During the installation process, we used the entire hard disk for Ubuntu in step 20, which means your MacOS will be permanently deleted. If you want to keep the MacOS, you will have to make disk partitions, a small 8GB partition and a larger 1000GB for Linux. You can also go to Disk Utility to create proper partitions before you start installing Linux. Have a look here (https://linuxnewbieguide.org/how-to-install-linux-on-a-macintosh-computer/)