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Sender	Message	Time
7 Sep 2024
commiterate	* It seems there's something I'm misunderstanding about the UKI that should be included in appliances. Maybe it includes systemd and some other stuff that removes the need for the `/run` folder and `/bin/sh` being symlinked to the Nix store's Bash install? https://nixos.org/manual/nixos/stable/#sec-image-repart-appliance There's this repo which seems to be producing a working image that the author is using: https://github.com/tnytown/nixos-lima-vm Trying to do the same thing and launching the `.raw` file in Virtual Machine Manager w/ QEMU + KVM doesn't work though. It hangs at "Booting from Hard Disk...".	02:22:06
commiterate	Hmm even the current image I'm generating with `make-nix-image` hangs, so either something's wrong with both my images or my QEMU setup is broken.	03:05:09
commiterate	* Hmm even the current image I'm generating with `make-nix-image` hangs, so either something's wrong with both my images or my QEMU setup is broken. NixOS test VMs seem to work fine though (since I was able to run the one used in the amazon-cloudwatch-agent NixOS tests fine).	03:05:37
commiterate	* Hmm playing around with `nixos/modules/image/repart.nix` and I'm not actually sure if this can be used in place of `nixos/lib/make-disk-image.nix`. `make-disk-image` has 2 steps: Create a disk image with an EFI partition (ESP) and a root partition with the Nix store in it. Create a disk image with a full NixOS on it. Only step 2 requires booting up a VM and is optional if you don't need a full NixOS install. Essentially, it takes the disk image from step 1 and then runs NixOS install steps. Step 1 doesn't require a VM just like `repart`, though it's using `cptofs` instead which is from the Linux kernel source tree (docs). `repart` basically operates the same as `make-disk-image` in mode 1.	16:58:36
commiterate	* Hmm playing around with `nixos/modules/image/repart.nix` and I'm not actually sure if this can be used in place of `nixos/lib/make-disk-image.nix`. `make-disk-image` has 2 steps: Create a disk image with an EFI partition (ESP) and a root partition with the Nix store in it. Create a disk image with a full NixOS on it. Only step 2 requires booting up a VM and is optional if you don't need a full NixOS install. Essentially, it takes the disk image from step 1 and then runs NixOS install steps. Step 1 doesn't require a VM just like `repart`, though it's using `cptofs` instead which is from the Linux kernel source tree (docs). `repart` basically operates the same as `make-disk-image` in step 1.	16:58:50
commiterate	Nevermind, it's because I disabled hardware virtualization awhile back in an attempt to fix some stability problems. Turning it back on and forcing QEMU to use UEFI lets it proceed.	18:26:17
commiterate	* Nevermind, it's because I disabled hardware virtualization awhile back in an attempt to fix some stability problems. Turning it back on and forcing QEMU to use UEFI lets it proceed. Just fails to mount the root partition now.	20:57:27
commiterate	* Hmm playing around with `nixos/modules/image/repart.nix` and I'm not actually sure if this can be used in place of `nixos/lib/make-disk-image.nix`. `make-disk-image` has 2 steps: Create a disk image with an EFI system partition (ESP) and a root partition with the Nix store in it. Create a disk image with a full NixOS on it. Only step 2 requires booting up a VM and is optional if you don't need a full NixOS install. Essentially, it takes the disk image from step 1 and then runs NixOS install steps. Step 1 doesn't require a VM just like `repart`, though it's using `cptofs` instead which is from the Linux kernel source tree (docs). `repart` basically operates the same as `make-disk-image` in step 1.	21:00:52
14 Sep 2024
Arian	There is no need for nixos-install to make a nixos image	08:04:36
Arian	You just need a /nix/store. The initrd takes care of setting up all other directories on startup	08:04:58
Arian	And you need to register the nix store paths into the nix database	08:05:10
Arian	I can make you a little example that is not appliance based	08:05:25
Arian	But need to catch a boat now first :')	08:05:43
Arian	There's also no need for UKIs. You can just put a classic systemd-boot bootloader entry on the ESP as well	08:06:21
Arian	https://github.com/NixOS/amis/blob/main/modules/amazon-image.nix	08:07:01
commiterate	yeah I have a non-UKI version in a local file I haven't pushed. Didn't get the root partition mount working yet since I got distracted with the EC2 SSH utils stuff (need to get EC2 Instance Connect working for the GitLab auto-scaling AWS runners)	08:07:29
Arian	This is missing the nix store path registration part though	08:07:31
Arian	So can do like a boot.postBootCommands = `nix-store --load-db < /nix/store/registration`	08:10:30
Arian	Someone made the bash script work with nix too	08:10:52
Arian	Did you see that? Though a go version does sound better tbh	08:11:07
Arian	Anyhow thanks for all the help on this. Nice to have another person trying to make this nicer.	08:12:07
commiterate	yeah I saw a PR for macOS support that happens to also cover Nix	08:12:39
commiterate	though it seems like the repo's kind of abandoned	08:12:58
Arian	https://github.com/NixOS/amis/pull/114	08:13:41
commiterate	I'm meeting with some AWS TAMs on Tuesday to go over a few feature requests. I need to drag some AWS PM and engineer aliases out of them so the feature requests don't get lost in the system	08:13:45
commiterate	oh huh	08:13:51
Arian	We also have TAMs here so if we can bundle forces to get something roadmapped that helps us lemme know	08:14:25
commiterate	ah they're relying on the fixup phase patching	08:14:36
Arian	Though I'm on PTO until 23rd :)	08:14:39
commiterate	I was going to try that at first and then just thought it would somehow be easier to rewrite	08:14:50

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