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"They just have to read the documentation"
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this post was submitted on 14 May 2025
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Okay, but when I figure it out on my desktop I just copy paste the exact snippet to my laptop and it just works.
Do you think I can remember the steps I took to fix my issue with Ubuntu? I don't remember what file I modified and where I put some config file.
But to be fair, Nix is not the only answer to that. There are lots of tools for just dotfiles but you can also build something using e.g. ansible to manage everything.
All my computers have their config in a git repo. That includes users, packages, services, dotfiles, /etc configs and so on. I used ansible before writing my own tool. I can install Arch from scratch and only need to partition, run one script and then apply my config on first boot using my tool to have my system restored. I know it's not as declarative and absolute/reproducible as Nix, but it works and it's way less painful than my last attempt at giving NixOS a go.
I'm about neck deep in ancible/salt/chef over the years at work.
They are great tools for simple configurations where multiple people are needed in the kitchen, but they require meticulous curation.
But I buy a new laptop, I slap in my USB vanilla Nix ISO, drop two config files in /etc/nixos call rebuild and I'm done.
Updating my packages to latest is a single command. Adding a package is a single line. And the most powerful thing, nix-shell -p whatever install whatever for that session. I don't even bother putting most stuff into my declaritive configs, nix-shell -p ffmpeg, when I exit it's no longer available.
And if I do something awful to my config and brick it, it's just one grub menu to go back to the previous version.
Either my Ansible knowledge is too limited which is entirely possible, or you can't do stuff there that's possible with Nix. Let's stay go with my example that you have something that requires changes in PAM. So you write an Ansible file installing the package (which is distribution-specific, so you're losing one advantage you had over NixOS), enable the service and add your entries to the respective PAM file (e.g. login because you want to enable user authentication against kanidm on your machine). The ordering in these files matter. Sure you have
insertbeforeandinsertafterforlineinfileandblockinfile, but this basically requires you to know the rest of the file in advance… not a problem if your system is always the same, but you don't have the flexibility and composability that Nix offers.I'd say, from my experience with Ansible, that it can absolutely do all of that. Might be able to use a single task for the package install, if the distro supports the generic
packagemodule. There's also a pamd module that would likely cover your needs there. If not, it would still be possible with a custom module or some Xinfile fuckery (if it can be fine programmatically, it can be done in Ansible, more niche things may require writing code, however).It would not be as terse though. Really wish there was a good middle ground.
It can do that, but it gets more complicated because you are doing this is in an imperative way. For example, in Nix it's trivial to change the config and remove something.
In ansible there's no guarantee installing a package and removing it won't have side effects. You could install a DE and decide to switch back, but it already changed some files on your system
This is true. It can be done but would require functionality not included in stock Ansible.