364d3609cd
Pin the `nixpkgs` registry entry to the *filtered* nixpkgs source to avoid copying the entire `.git` directory to the ISO when building from a local checkout. Also set `to` directly instead of the `flake.outPath` hack.
65 lines
2.5 KiB
Nix
65 lines
2.5 KiB
Nix
# Provide an initial copy of the NixOS channel so that the user
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# doesn't need to run "nix-channel --update" first.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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# This is copied into the installer image, so it's important that it is filtered
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# to avoid including a large .git directory.
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# We also want the source name to be normalised to "source" to avoid depending on the
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# location of nixpkgs.
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# In the future we might want to expose the ISO image from the flake and use
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# `self.outPath` directly instead.
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nixpkgs = lib.cleanSource pkgs.path;
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# We need a copy of the Nix expressions for Nixpkgs and NixOS on the
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# CD. These are installed into the "nixos" channel of the root
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# user, as expected by nixos-rebuild/nixos-install. FIXME: merge
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# with make-channel.nix.
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channelSources = pkgs.runCommand "nixos-${config.system.nixos.version}"
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{ preferLocalBuild = true; }
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''
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mkdir -p $out
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cp -prd ${nixpkgs.outPath} $out/nixos
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chmod -R u+w $out/nixos
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if [ ! -e $out/nixos/nixpkgs ]; then
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ln -s . $out/nixos/nixpkgs
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fi
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${optionalString (config.system.nixos.revision != null) ''
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echo -n ${config.system.nixos.revision} > $out/nixos/.git-revision
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''}
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echo -n ${config.system.nixos.versionSuffix} > $out/nixos/.version-suffix
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echo ${config.system.nixos.versionSuffix} | sed -e s/pre// > $out/nixos/svn-revision
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'';
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in
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{
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# Pin the nixpkgs flake in the installer to our cleaned up nixpkgs source.
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# FIXME: this might be surprising and is really only needed for offline installations,
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# see discussion in https://github.com/NixOS/nixpkgs/pull/204178#issuecomment-1336289021
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nix.registry.nixpkgs.to = {
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type = "path";
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path = nixpkgs;
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};
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# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
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# for nixos-install.
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boot.postBootCommands = mkAfter
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''
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if ! [ -e /var/lib/nixos/did-channel-init ]; then
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echo "unpacking the NixOS/Nixpkgs sources..."
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mkdir -p /nix/var/nix/profiles/per-user/root
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${config.nix.package.out}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels \
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-i ${channelSources} --quiet --option build-use-substitutes false \
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${optionalString config.boot.initrd.systemd.enable "--option sandbox false"} # There's an issue with pivot_root
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mkdir -m 0700 -p /root/.nix-defexpr
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ln -s /nix/var/nix/profiles/per-user/root/channels /root/.nix-defexpr/channels
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mkdir -m 0755 -p /var/lib/nixos
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touch /var/lib/nixos/did-channel-init
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fi
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'';
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}
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