44 lines
1.5 KiB
Nix
44 lines
1.5 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, pkgs, ... }:
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with pkgs.lib;
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let
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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.
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channelSources = pkgs.runCommand "nixos-${config.system.nixosVersion}"
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{ expr = builtins.readFile ../../../lib/channel-expr.nix; }
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''
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mkdir -p $out/nixos
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cp -prd ${pkgs.path} $out/nixos/nixpkgs
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ln -s nixpkgs/nixos $out/nixos/nixos
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chmod -R u+w $out/nixos
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rm -rf $out/nixos/nixpkgs/.git
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echo -n ${config.system.nixosVersion} > $out/nixos/nixpkgs/.version
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echo -n "" > $out/nixos/nixpkgs/.version-suffix
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echo "$expr" > $out/nixos/default.nix
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'';
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in
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{
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# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
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# for nixos-install.
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boot.postBootCommands =
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''
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if ! [ -e /var/lib/nixos/did-channel-init ]; then
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echo "unpacking the NixOS/Nixpkgs sources..."
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mkdir -p /nix/var/nix/profiles/per-user/root
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${config.environment.nix}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels \
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-i ${channelSources} --quiet --option use-substitutes false
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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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