50 lines
1.7 KiB
Nix
50 lines
1.7 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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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// > $out/nixos/svn-revision
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'';
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in
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{
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# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
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# for nixos-install.
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boot.postBootCommands = mkAfter
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''
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if ! [ -e /var/lib/nixos/did-channel-init ]; then
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echo "unpacking the NixOS/Nixpkgs sources..."
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mkdir -p /nix/var/nix/profiles/per-user/root
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${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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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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