Nixos Arm Image Generation?

[Colin Rice]

Hi,

What I'd like to do is be able to produce raspberry pi images as flat files (basically that could be written to a sd image and just work), with some custom services mixed in (for my own local projects).

I was wondering if anyone would have objections (or suggestions on a better way to do this) to me trying to get make-disk-image

https://github.com/NixOS/nixpkgs/blob/master/nixos/lib/make-disk-image.nix

to work on arm - (maybe with follow on work to get the sd image builder pathway to also use the same library?).

A first feature would be to add modify the boot loader options to allow for extlinux bootloaders as well as perhaps a wrapper which populates the various raspberry pi 3 boot files.

Thanks

-Colin

[Tuomas Tynkkynen]

Hi,

You can just import nixos/modules/installer/cd-dvd/sd-image.nix on its own (similar to say, nixos/modules/installer/cd-dvd/sd-image-armv7l-multiplatform.nix does it) and start working from that. No need to involve make-disk-image.nix.

While it would be nice to merge sd-image.nix and make-disk-image.nix to a common implementation, it's going to be a huge yak shaving project, starting from fixing upstream lkl to work on ARM (last time I checked it doesn't), making make-disk-image.nix to be not dependent on Qemu/KVM (I have this project of adding Python bindings to lkl which could be used to replace the Qemu parts like setting correct permissions on /nix/store, but that itself is an >1k lines of patch to lkl), and so on...

[Colin Rice]

Ah - I didn't realize that make disk image used qemu + kvm. I must admit I want to use it because that way I don't have to need around with populating the boot folder like what sd-image-aarch64 does. I'll take a second try at just using the installer infrastructure.

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