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How do you realistically build your own OS with Arch Linux? (lemm.ee)

submitted 2 months ago by [email protected] to c/[email protected]

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cross-posted from: https://lemm.ee/post/40063668

As a Linux newbie, all I know about Arch Linux is that it is a DIY distro where you assemble the entirely of the OS by scratch. Somehow it feels like it is too easy than it needs to be, even if it is primarily meant for experienced users. I imagine it to be less like building your PC from parts bought from the market and more like building each and every component of the PC by scratch along with building the PC, which I assume to be much harder for the average consumer. It seems absurd how it is possible for a single person to incorporate the innumerable components required for functionality in a personal system that does not crash 100% of the time due to countless incompatibility errors that come with doing something like this.

I would like someone to elaborate on how it feels to 'build' a system software by yourself with Arch and how it is reasonable to actually do so in a simple language. I do have some experience in programming, mainly in webdev, so it's not like I need a baby-like explanation in how this works but it would be nice to get to know about this from someone who could understand where this confusion/curiosity is coming from.

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[–] [email protected] 21 points 2 months ago* (last edited 2 months ago)

I think you misunderstand what Arch is. You absolutely do not assemble the entirety of the OS from scratch. You don't compile anything during an Arch install—you install pre-compiled binaries. And you don't actually have an awful lot of OS freedom in terms of what gets installed. If you wanted to use, say, openrc+musl+busybox+dracut, Arch wouldn't be for you, as Arch uses systemd+glibc+gnu+mkinitcpio (You can try to replace these but these are what Arch uses by default; if you're wanting to change these things, maybe just use a different distro). Arch just doesn't install a display manager (you don't need one; I don't use one), any kind of graphical session (you technically don't need one either, but I assume the vast majority of desktop users want a graphical session), or a bootloader. You can install all of those things yourself. Assuming you want all three of those things, that's probably just three packages you install, and the OS doesn't install for you, so that you can pick them yourself.

Arch doesn't have an installer insofar as you install it with shell commands, but also the actual install itself is just one pacstrap command which installs a full OS for you in one command.

If you're wanting to build an OS entirely from scratch, you may want to look into Linux from Scratch [disclaimer: I have not done LFS]. I don't know of anyone who actually daily drives LFS though, as you wouldn't have a package manager which would put most users off.

[–] [email protected] 16 points 2 months ago* (last edited 2 months ago) (1 children)

Oh it's not quite as "from scratch" as some people make it out to be. It definitely can be more work than most distros, but mostly it's pretty straightforward and you generally just follow some wiki guide or another when picking "components" to install and I think nowadays you can use prebuilt binaries too (I haven't used Arch in a good while.) There's really not all that many moving parts, most of them are sort of a package deal – if you want to use X, you have to install Y and Z. It really is more like building a PC from parts.

Now, if you actually want to build a Linux system from scratch, there's the very surprisingly named Linux From Scratch project

[–] [email protected] 7 points 2 months ago (1 children)

The archinstall script has a list of "profiles" that you can select from (custom, desktop, minimal, server, tailored, xorg).. And if you select "desktop" it will prompt you which DE or WM you want to install. (awesome, bspwm, budgie, cinnamon, cosmic, cutiefish, deepin, enlightment, gnome, hyprland, i3, lxqt, mate, plasma, qtile, sway, xfce4).

By the time you're done with the archinstall script, you basically have a fully functioning arch (ive never used the script seriously, so I have no idea what all remains not set up doing this).

The main difference between Arch and Ubuntu in this regard, is that if you want to run KDE Plasma, you download the common Arch ISO, and select Plasma at installation time. Compared to Ubuntu where you would download the "Kubuntu" spin, so you are selecting Plasma when you acquire the ISO in the first place.

There is no "default" arch DE, so when you install Arch, there is a lot of decisions to make (and you may not know how to make those decisions if its your first distro), whereas Ubuntu makes a lot of decisions for you, so you have to answer no questions to get set up (but you may be set up in a way you weren't expecting). In this regard, Arch really does just feel like building a PC from parts, you just have to pick all the parts. Ubuntu is more like buying a pre-built.

[–] [email protected] 2 points 2 months ago (1 children)

I’ve done an Arch install the “manual” way a handful of times (mainly to say that I did it), but whenever I do an install now, it’s with the script. It’s probably the fastest I have ever installed a workable OS, ever! It works really well at getting what you need without too much fluff.

[–] [email protected] 2 points 2 months ago

I've only done it the "manual" way but I don't think the script was even a thing the last time I installed Arch, which must have been close to 15 years ago now.

[–] [email protected] 9 points 2 months ago (1 children)

Arch is not really a DIY distro and certainly not for noobies. Those saying so are either naive or a troll. Arch is an excellent resource and it has its uses. Arch assumes you have a full understanding of a POSIX operating system and all components. Arch has an encyclopedic wealth of great information. What Arch is not, is beginner friendly, or remotely tutorial. If you try to use Arch to learn how a POSIX system works, you are going to have a very bad experience. This is about like me handing you the encyclopedia and telling you to go learn physics.

For a beginner, start with Fedora or Ubuntu because they won't wreck your system. Fedora is on the cutting edge while Ubuntu is stable — which only means that most packages are frozen and will not stay updated in the latest version. It means many things are old and outdated, but you can write a high level script that will never be broken by some change that happens in a software library in a random update. Windows is also a stable (outdated) operating system so that companies can write software that will not get broken because they fail to maintain it regularly.

Gentoo is a tutorial distro. It is the compile everything yourself and learn how everything works distro. Gentoo must be kept up to date, but if the Portage package manager needs input from the user, the Gentoo packagers layout the details in a very approachable way, assuming you are competent enough to make it through a Gentoo installation in the first place. Most people take days to weeks to make it through their first full Gentoo installation and configuration. This is guided, but there is an enormous amount to take in and figure out. You'll be compiling and configuring everything from the bootloader and kernel all the way up. If you are at this level of competence and understanding, where you can run Gentoo, THAT is when you should consider running Arch. Arch is basically Gentoo, but without the compiling and configurations. All the components are easily accessible in binary form.

If you run Gentoo for awhile and you really want to understand what the packagers are doing on an even deeper level, then do a Linux From Scratch build (LFS) this is a thing too.

If you want to learn in situ and actually use a system, use Fedora, get The Linux Bible if you want to learn sysadmin, and leverage the RHEL documentation for more advanced stuff because REHL is the original distro, and where a lot of the core kernel devs come from. RHEL is down stream of Fedora.

Every distro has a distinct reason it exists. It is foolish to turn them into team sports like brands. A key part of the learning curve is figuring out why each distro exists and leveraging that knowledge. I use them all for various reasons and know which to use for documentation. I may use Fedora as my base, but I have Arch, Ubuntu, and Gentoo that run in containers on my host machine, and have run all three as my base system in the past.

[–] [email protected] 1 points 2 months ago (1 children)

Arch is not basically gentoo. Gentoo is about as close as you can get to vanilla Linux while still being a distro. Arch is pretty opinionated about what defaults should run, gentoo is explicitly flexible. Also the compiling on gentoo thing really needs to stop, there have been binary kernel packages for ages, even before the recent improvement to binary packages. The gentoo installation in someways is easier than the arch installation, as long as you use defaults and customize after first booting up, and if you really want to customize stuff, portage is an absolute beast.

[–] [email protected] 3 points 2 months ago (1 children)

Arch is a foundational distro like Gentoo. It is not fully configured and requires considerable configuration to be secure in ways that are not clearly defined. Pacman is an abysmal package manager for anyone short of a CS degree. Changes are regularly made that assume considerable knowledge of systems and otherwise require in depth reading. This often involves peripheral packages of no interest the the end user and where an incorrect choice may require loading from backups.

In the last 10 years I have run most of the major distros. Arch is the only time I have ever had to actually use my backups. The third time, I just moved on. Arch does a terrible job of describing these types of changes, and it is deeply frustrating to actually use Arch for some detailed project, need to install a package, have some tangent peripheral update that requires input, and get stuck in a rabbit hole of research because of the tangent. Arch will not make anything about this easy or clear like with Gentoo. Arch will dump you into some dev's magnum opus of a wiki article that still does not layout the issue you are faced with. That article will put the user into a bottomless fractal links chasm of articles as a result, because nothing about Arch is tutorial.

Yes Gentoo has some binary packages. People run RHEL and Debian-stable as a desktop; they run Fedora as a script server; they use a steamdeck as a desktop. What a distro is known for is just a stereotype. It still applies and the exceptions do not change the primary use case.

The important choice right now IMO is how you protect your bootloader, but I'm a foolish intermediate level user at best. I do my best to tell people the counter point to the evangelical believers distro. It was by-far my worst experience with any distro and pushing beginners into that experience is downright toxically counter productive.

[–] [email protected] 3 points 2 months ago* (last edited 2 months ago)

The best way to keep an Arch daily driver stable is to use a CoW filesystem like btrfs or ZFS and use a pacman hook that takes a snapshot before package installation or updates. If you run an update or package install that breaks something in an inconvenient way 20 minutes before you have to be on a call using said system you just revert to the snapshot, reboot and you're rolled back. I've run Arch as my daily driver like this for 4-5y now and can count the number of times I've needed to roll back like this on one hand (mostly I just don't run updates when I'm under time pressure.) Arch really doesn't break in a major way all that often once you're over the first 6-9mo of the learning curve, ie: it usually stops breaking once you stop fucking around and poking things while you're learning about them.

I wouldn't recommend Arch as a daily driver to someone who isn't generally competent at linux admin and troubleshooting, it's a handful for people who aren't up on their skills yet. On the other hand it definitely will help you develop those skills, that just takes some time. A snapshot and rollback system gives you the freedom to break most things with a reliable way to roll back to a known good state afterwards.

[–] [email protected] 2 points 2 months ago

I was pondering on building my own spin of Arch. Have a look at this: archiso

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago)

You don't really build it from scratch. It's just very customizable. And it's usually installed by typing in the command line instructions yourself to do every step of the installation. That also gives you customizability. Other distributiins have a nice installer, you get some default options and click on "continue" and it does the same thing behind the scene. Like partition the harddrive, choose the default software, write it to disk, configure things and install a bootloader. With arch you do that yourself on the command line. They wrote some good documentation to help you. And you'll learn quite a bit in the process.