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docs: recommend nixos-generators for iso building

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Chris Montgomery 2022-07-09 16:28:59 -04:00
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doc/start/iso.md
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# ISO
# Installation Media
This project leverages [nix-community/nixos-generators][nixos-generators] for
building machine images. In most cases, you'll probably want to use the
`install-iso` format.
Making an installable ISO for `hosts/bootstrap.nix` is as simple as:
Making and writing an installable iso for `hosts/bootstrap.nix` is as simple as:
```sh
bud build bootstrap bootstrapIso
sudo -E $(which bud) burn
nix run github:nix-community/nixos-generators -- \
--format install-iso \
--flake '.#bootstrap'
```
This works for any host.
Then "burn" the ISO to your USB stick (or CD-R if you like!) following the
[instructions in the NixOS manual][burn] (or using your preferred USB burner).
## ISO image nix store & cache
You can also swap out the `--format` for [any of the others][formats] supported
by nixos-generators.
The iso image holds the store to the live environment and _also_ acts as a binary cache
to the installer. To considerably speed up things, the image already includes all flake
`inputs` as well as the `devshell` closures.
Continue by following the usual installation instructions in the NixOS manual.
While you _could_ provision any machine with a single stick, a custom-made iso for
the host you want to install DevOS to, maximises those local cache hits.
## ISO Nix Store and Cache
For hosts that don't differ too much, a single usb stick might be ok, whereas when
there are bigger differences, a custom-made usb stick will be considerably faster.
The ISO image holds the Nix store for the live environment and _also_ acts as a
binary cache to the installer. To considerably speed things up, the image
already includes all flake `inputs` as well as the `devshell` closures.
While you _could_ provision any NixOS machine with the same USB stick, an ISO
custom-made for your target host will maximise those local cache hits. For hosts
that don't differ too much, a single USB stick might be ok, whereas when there
are bigger differences, a custom-made USB stick will be considerably faster.
[nixos-generators]: https://github.com/nix-community/nixos-generators
[burn]: https://nixos.org/manual/nixos/stable/index.html#sec-booting-from-usb
[formats]: https://github.com/nix-community/nixos-generators/tree/master/formats

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examples/devos/hosts/nixos/bootstrap.nix
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{ profiles, ... }:
{
# build with: `bud build bootstrap bootstrapIso`
# reachable on the local link via ssh root@fe80::47%eno1
# where 'eno1' is replaced by your own machine's network
# interface that has the local link to the target machine
imports = [
# profiles.networking
profiles.core.nixos
@ -13,6 +9,6 @@
boot.loader.systemd-boot.enable = true;
# will be overridden by the bootstrapIso instrumentation
# Required, but will be overridden in the resulting installer ISO.
fileSystems."/" = { device = "/dev/disk/by-label/nixos"; };
}