403 lines
15 KiB
Nix
403 lines
15 KiB
Nix
{
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description = "nixos-runner";
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inputs = {
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nixpkgs = {
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url = "nixpkgs/nixos-unstable";
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};
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flake-utils = {
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url = "github:numtide/flake-utils";
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};
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};
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outputs = { self, nixpkgs, flake-utils }@inputs:
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(flake-utils.lib.eachDefaultSystem
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(system:
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let
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pkgs = import nixpkgs {
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inherit system;
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config.permittedInsecurePackages = [
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"nodejs-16.20.2"
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];
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};
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lib = pkgs.lib;
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in
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{
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packages = {
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nixos-runner =
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let
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bundleNixpkgs = true;
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channelName = "nixpkgs";
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channelURL = "https://nixos.org/channels/nixos-unstable";
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defaultPkgs = [
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pkgs.bashInteractive
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pkgs.bind.dnsutils
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pkgs.coreutils-full
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pkgs.curl
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pkgs.dogdns
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pkgs.gawk
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pkgs.git
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pkgs.glibc
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pkgs.gnugrep
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pkgs.gnused
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pkgs.iputils
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pkgs.nix
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pkgs.nodejs-16_x
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pkgs.nushell
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pkgs.podman
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pkgs.stdenv.cc.cc.lib
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self.packages.${system}.push-container
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];
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flake-registry = null;
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users = {
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root = {
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uid = 0;
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shell = "${pkgs.bashInteractive}/bin/bash";
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home = "/root";
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gid = 0;
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groups = [ "root" ];
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description = "System administrator";
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};
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nobody = {
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uid = 65534;
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shell = "${pkgs.shadow}/bin/nologin";
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home = "/var/empty";
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gid = 65534;
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groups = [ "nobody" ];
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description = "Unprivileged account (don't use!)";
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};
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} // lib.listToAttrs (
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map
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(
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n: {
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name = "nixbld${toString n}";
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value = {
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uid = 30000 + n;
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gid = 30000;
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groups = [ "nixbld" ];
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description = "Nix build user ${toString n}";
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};
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}
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)
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(lib.lists.range 1 32)
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);
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groups = {
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root.gid = 0;
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nixbld.gid = 30000;
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nobody.gid = 65534;
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};
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userToPasswd = (
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k:
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{ uid
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, gid ? 65534
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, home ? "/var/empty"
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, description ? ""
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, shell ? "/bin/false"
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, groups ? [ ]
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}: "${k}:x:${toString uid}:${toString gid}:${description}:${home}:${shell}"
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);
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passwdContents = (
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lib.concatStringsSep "\n"
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(lib.attrValues (lib.mapAttrs userToPasswd users))
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);
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userToShadow = k: { ... }: "${k}:!:1::::::";
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shadowContents = (
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lib.concatStringsSep "\n"
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(lib.attrValues (lib.mapAttrs userToShadow users))
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);
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groupMemberMap = (
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let
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# Create a flat list of user/group mappings
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mappings = (
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builtins.foldl'
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(
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acc: user:
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let
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groups = users.${user}.groups or [ ];
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in
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acc ++ map
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(group: {
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inherit user group;
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})
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groups
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)
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[ ]
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(lib.attrNames users)
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);
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in
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(
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builtins.foldl'
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(
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acc: v: acc // {
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${v.group} = acc.${v.group} or [ ] ++ [ v.user ];
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}
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)
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{ }
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mappings)
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);
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groupToGroup = k: { gid }:
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let
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members = groupMemberMap.${k} or [ ];
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in
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"${k}:x:${toString gid}:${lib.concatStringsSep "," members}";
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groupContents = (
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lib.concatStringsSep "\n"
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(lib.attrValues (lib.mapAttrs groupToGroup groups))
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);
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defaultNixConf = {
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sandbox = "false";
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build-users-group = "nixbld";
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trusted-public-keys = [
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"cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
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];
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experimental-features = [
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"flakes"
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"nix-command"
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];
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};
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nixConfContents = (lib.concatStringsSep "\n" (lib.mapAttrsFlatten
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(n: v:
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let
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vStr = if builtins.isList v then lib.concatStringsSep " " v else v;
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in
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"${n} = ${vStr}")
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defaultNixConf)) + "\n";
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containerSettings = ''
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[engine]
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init_path = "${pkgs.catatonit}/bin/catatonit"
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helper_binaries_dir = [ "${pkgs.podman}/libexec/podman" ]
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[network]
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cni_plugin_dirs = [ "${pkgs.cni-plugins}/bin" ]
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network_backend = "netavark"
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'';
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containerStorage = ''
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[storage]
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driver = "overlay"
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graphroot = "/var/lib/containers/storage"
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runroot = "/run/containers/storage"
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'';
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containerRegistries = ''
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[registries]
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[registries.block]
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registries = [ ]
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[registries.insecure]
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registries = [ ]
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[registries.search]
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registries = [ "docker.io", "quay.io" ]
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'';
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containerPolicy = builtins.toJSON {
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default = [
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{
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type = "insecureAcceptAnything";
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}
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];
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transports = {
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docker-daemon = {
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"" = [
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{
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type = "insecureAcceptAnything";
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}
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];
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};
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};
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};
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baseSystem =
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let
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nixpkgs = pkgs.path;
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channel = pkgs.runCommand "channel-nixos" { inherit bundleNixpkgs; } ''
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mkdir $out
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if [ "$bundleNixpkgs" ]; then
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ln -s ${nixpkgs} $out/nixpkgs
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echo "[]" > $out/manifest.nix
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fi
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'';
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rootEnv = pkgs.buildPackages.buildEnv {
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name = "root-profile-env";
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paths = defaultPkgs;
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};
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manifest = pkgs.buildPackages.runCommand "manifest.nix" { } ''
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cat > $out <<EOF
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[
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${lib.concatStringsSep "\n" (builtins.map (drv: let
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outputs = drv.outputsToInstall or [ "out" ];
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in ''
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{
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${lib.concatStringsSep "\n" (builtins.map (output: ''
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${output} = { outPath = "${lib.getOutput output drv}"; };
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'') outputs)}
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outputs = [ ${lib.concatStringsSep " " (builtins.map (x: "\"${x}\"") outputs)} ];
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name = "${drv.name}";
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outPath = "${drv}";
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system = "${drv.system}";
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type = "derivation";
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meta = { };
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}
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'') defaultPkgs)}
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]
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EOF
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'';
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profile = pkgs.buildPackages.runCommand "user-environment" { } ''
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mkdir $out
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cp -a ${rootEnv}/* $out/
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ln -s ${manifest} $out/manifest.nix
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'';
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in
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pkgs.runCommand "base-system"
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{
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inherit
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containerPolicy
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containerRegistries
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containerSettings
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containerStorage
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groupContents
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nixConfContents
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passwdContents
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shadowContents;
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passAsFile = [
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"containerPolicy"
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"containerRegistries"
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"containerSettings"
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"containerStorage"
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"groupContents"
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"nixConfContents"
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"passwdContents"
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"shadowContents"
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];
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allowSubstitutes = false;
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preferLocalBuild = true;
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} ''
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env
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set -x
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mkdir -p $out/etc
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mkdir -p $out/etc/ssl/certs
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ln -s /nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt $out/etc/ssl/certs
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cat $passwdContentsPath > $out/etc/passwd
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echo "" >> $out/etc/passwd
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cat $groupContentsPath > $out/etc/group
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echo "" >> $out/etc/group
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cat $shadowContentsPath > $out/etc/shadow
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echo "" >> $out/etc/shadow
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mkdir -p $out/usr
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ln -s /nix/var/nix/profiles/share $out/usr/
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mkdir -p $out/nix/var/nix/gcroots
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mkdir -p $out/tmp
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mkdir -p $out/var/tmp
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mkdir -p $out/etc/nix
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cat $nixConfContentsPath > $out/etc/nix/nix.conf
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mkdir -p $out/root
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mkdir -p $out/nix/var/nix/profiles/per-user/root
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mkdir -p $out/etc/containers
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mkdir -p $out/etc/containers/networks
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mkdir -p $out/var/lib/containers/storage
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mkdir -p $out/run/containers/storage
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cat $containerSettingsPath > $out/etc/containers/containers.conf
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cat $containerStoragePath > $out/etc/containers/storage.conf
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cat $containerRegistriesPath > $out/etc/containers/registry.conf
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cat $containerPolicyPath > $out/etc/containers/policy.json
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ln -s ${profile} $out/nix/var/nix/profiles/default-1-link
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ln -s $out/nix/var/nix/profiles/default-1-link $out/nix/var/nix/profiles/default
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ln -s /nix/var/nix/profiles/default $out/root/.nix-profile
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ln -s ${channel} $out/nix/var/nix/profiles/per-user/root/channels-1-link
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ln -s $out/nix/var/nix/profiles/per-user/root/channels-1-link $out/nix/var/nix/profiles/per-user/root/channels
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mkdir -p $out/root/.nix-defexpr
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ln -s $out/nix/var/nix/profiles/per-user/root/channels $out/root/.nix-defexpr/channels
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echo "${channelURL} ${channelName}" > $out/root/.nix-channels
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mkdir -p $out/bin $out/usr/bin
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ln -s ${pkgs.coreutils}/bin/env $out/usr/bin/env
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ln -s ${pkgs.bashInteractive}/bin/bash $out/bin/sh
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'' + (lib.optionalString (flake-registry != null) ''
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nixCacheDir="/root/.cache/nix"
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mkdir -p $out$nixCacheDir
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globalFlakeRegistryPath="$nixCacheDir/flake-registry.json"
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ln -s ${flake-registry}/flake-registry.json $out$globalFlakeRegistryPath
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mkdir -p $out/nix/var/nix/gcroots/auto
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rootName=$(${pkgs.nix}/bin/nix --extra-experimental-features nix-command hash file --type sha1 --base32 <(echo -n $globalFlakeRegistryPath))
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ln -s $globalFlakeRegistryPath $out/nix/var/nix/gcroots/auto/$rootName
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'');
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in
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pkgs.dockerTools.buildLayeredImageWithNixDb {
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name = "nixos-runner";
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tag = "latest";
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maxLayers = 2;
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contents = [
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baseSystem
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] ++ defaultPkgs;
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extraCommands = ''
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rm -rf nix-support
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ln -s /nix/var/nix/profiles nix/var/nix/gcroots/profiles
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'';
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fakeRootCommands = ''
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chmod 1777 tmp
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chmod 1777 var/tmp
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'';
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config = {
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Cmd = [ "${pkgs.bashInteractive}/bin/bash" ];
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Env = [
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"USER=root"
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"PATH=${lib.concatStringsSep ":" [
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"/root/.nix-profile/bin"
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"/nix/var/nix/profiles/default/bin"
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"/nix/var/nix/profiles/default/sbin"
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]}"
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"MANPATH=${lib.concatStringsSep ":" [
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"/root/.nix-profile/share/man"
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"/nix/var/nix/profiles/default/share/man"
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]}"
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"LD_LIBRARY_PATH=${pkgs.lib.makeLibraryPath [pkgs.glibc pkgs.stdenv.cc.cc.lib]}"
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"SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
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"GIT_SSL_CAINFO=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
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"NIX_SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
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"NIX_PATH=/nix/var/nix/profiles/per-user/root/channels:/root/.nix-defexpr/channels"
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];
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};
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};
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push-container = pkgs.writeTextFile {
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name = "push-container";
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destination = "/bin/push-container";
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text = lib.concatStringsSep "\n" [
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"#!${pkgs.nushell}/bin/nu"
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(builtins.readFile ./push-container.nu)
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];
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executable = true;
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};
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login-script = pkgs.writeScriptBin "login-script" ''
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echo -n "''${PLUGIN_PASSWORD}" | ${pkgs.podman}/bin/podman login --username "''${PLUGIN_USERNAME}" --password-stdin "''${PLUGIN_REGISTRY}"
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'';
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};
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apps = {
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push-container = {
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type = "app";
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program = "${self.packages.${system}.push-container}/bin/push-container";
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};
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login = {
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type = "app";
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program = "${self.packages.${system}.login-script}/bin/login-script";
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};
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};
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}
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)
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);
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}
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