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installer/cd-dvd/channel: allow to disable bundled channel

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When building kexec-based installer every mb saved will reduce the RAM usage and allow to install NixOS on smaller machines.
It also means that less data has to be downloaded from the network.
When using flakes or niv we no longer rely on nix channels beeing present
and when using something like nixos-anywhere, we no longer need to evaluate anything in the installer at all.
This commit is contained in:
Jörg Thalheim 2023-10-28 15:35:56 +02:00 committed by Jörg Thalheim
parent af459e624e
commit 94b810348a
1 changed files with 26 additions and 24 deletions
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50
nixos/modules/installer/cd-dvd/channel.nix
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@ -31,32 +31,34 @@ let
echo -n ${config.system.nixos.versionSuffix} > $out/nixos/.version-suffix
echo ${config.system.nixos.versionSuffix} | sed -e s/pre// > $out/nixos/svn-revision
'';
in
{
# Pin the nixpkgs flake in the installer to our cleaned up nixpkgs source.
# FIXME: this might be surprising and is really only needed for offline installations,
# see discussion in https://github.com/NixOS/nixpkgs/pull/204178#issuecomment-1336289021
nix.registry.nixpkgs.to = {
type = "path";
path = "${channelSources}/nixos";
};
options.system.installer.channel.enable = (lib.mkEnableOption "bundling NixOS/Nixpkgs channel in the installer") // { default = true; };
config = lib.mkIf config.system.installer.channel.enable {
# Pin the nixpkgs flake in the installer to our cleaned up nixpkgs source.
# FIXME: this might be surprising and is really only needed for offline installations,
# see discussion in https://github.com/NixOS/nixpkgs/pull/204178#issuecomment-1336289021
nix.registry.nixpkgs.to = {
type = "path";
path = "${channelSources}/nixos";
};
# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
# for nixos-install.
boot.postBootCommands = lib.mkAfter
''
if ! [ -e /var/lib/nixos/did-channel-init ]; then
echo "unpacking the NixOS/Nixpkgs sources..."
mkdir -p /nix/var/nix/profiles/per-user/root
${config.nix.package.out}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels \
-i ${channelSources} --quiet --option build-use-substitutes false \
${lib.optionalString config.boot.initrd.systemd.enable "--option sandbox false"} # There's an issue with pivot_root
mkdir -m 0700 -p /root/.nix-defexpr
ln -s /nix/var/nix/profiles/per-user/root/channels /root/.nix-defexpr/channels
mkdir -m 0755 -p /var/lib/nixos
touch /var/lib/nixos/did-channel-init
fi
'';
# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
# for nixos-install.
boot.postBootCommands = lib.mkAfter
''
if ! [ -e /var/lib/nixos/did-channel-init ]; then
echo "unpacking the NixOS/Nixpkgs sources..."
mkdir -p /nix/var/nix/profiles/per-user/root
${config.nix.package.out}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels \
-i ${channelSources} --quiet --option build-use-substitutes false \
${lib.optionalString config.boot.initrd.systemd.enable "--option sandbox false"} # There's an issue with pivot_root
mkdir -m 0700 -p /root/.nix-defexpr
ln -s /nix/var/nix/profiles/per-user/root/channels /root/.nix-defexpr/channels
mkdir -m 0755 -p /var/lib/nixos
touch /var/lib/nixos/did-channel-init
fi
'';
};
}