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https://github.com/NixOS/nix.git
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e194e27f85
Add options uid, gid, uname, and gname to docker.nix. Setting these to e.g. 1000, 1000, "user", "user" will build an image which runs and allows using Nix as that user.
325 lines
8.7 KiB
Nix
325 lines
8.7 KiB
Nix
{ pkgs ? import <nixpkgs> { }
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, lib ? pkgs.lib
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, name ? "nix"
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, tag ? "latest"
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, bundleNixpkgs ? true
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, channelName ? "nixpkgs"
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, channelURL ? "https://nixos.org/channels/nixpkgs-unstable"
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, extraPkgs ? []
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, maxLayers ? 100
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, nixConf ? {}
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, flake-registry ? null
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, uid ? 0
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, gid ? 0
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, uname ? "root"
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, gname ? "root"
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}:
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let
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defaultPkgs = with pkgs; [
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nix
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bashInteractive
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coreutils-full
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gnutar
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gzip
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gnugrep
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which
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curl
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less
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wget
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man
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cacert.out
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findutils
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iana-etc
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git
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openssh
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] ++ extraPkgs;
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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.optionalAttrs (uid != 0) {
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"${uname}" = {
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uid = uid;
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shell = "${pkgs.bashInteractive}/bin/bash";
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home = "/home/${uname}";
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gid = gid;
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groups = [ "${gname}" ];
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description = "Nix user";
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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 ${toString n}";
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};
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}
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)
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(lib.lists.range 1 32)
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);
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groups = {
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root.gid = 0;
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nixbld.gid = 30000;
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nobody.gid = 65534;
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} // lib.optionalAttrs (gid != 0) {
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"${gname}".gid = gid;
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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: { ... }: "${k}:!:1::::::";
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shadowContents = (
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lib.concatStringsSep "\n"
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(lib.attrValues (lib.mapAttrs userToShadow users))
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);
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# Map groups to members
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# {
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# group = [ "user1" "user2" ];
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# }
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groupMemberMap = (
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let
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# Create a flat list of user/group mappings
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mappings = (
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builtins.foldl'
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(
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acc: user:
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let
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groups = users.${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 = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
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};
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nixConfContents = (lib.concatStringsSep "\n" (lib.mapAttrsFlatten (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} = ${vStr}") (defaultNixConf // nixConf))) + "\n";
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userHome = if uid == 0 then "/root" else "/home/${uname}";
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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} $out/manifest.nix
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'';
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flake-registry-path = if (flake-registry == null) then
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null
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else if (builtins.readFileType (toString flake-registry)) == "directory" then
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"${flake-registry}/flake-registry.json"
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else
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flake-registry;
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in
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pkgs.runCommand "base-system"
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{
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inherit passwdContents groupContents shadowContents nixConfContents;
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passAsFile = [
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"passwdContents"
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"groupContents"
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"shadowContents"
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"nixConfContents"
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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 $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 $out${userHome}
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mkdir -p $out/nix/var/nix/profiles/per-user/${uname}
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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 $out${userHome}/.nix-profile
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ln -s ${channel} $out/nix/var/nix/profiles/per-user/${uname}/channels-1-link
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ln -s $out/nix/var/nix/profiles/per-user/${uname}/channels-1-link $out/nix/var/nix/profiles/per-user/${uname}/channels
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mkdir -p $out${userHome}/.nix-defexpr
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ln -s $out/nix/var/nix/profiles/per-user/${uname}/channels $out${userHome}/.nix-defexpr/channels
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echo "${channelURL} ${channelName}" > $out${userHome}/.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 $out/bin/sh
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'' + (lib.optionalString (flake-registry-path != null) ''
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nixCacheDir="${userHome}/.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-path} $out$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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inherit name tag maxLayers uid gid uname gname;
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contents = [ baseSystem ];
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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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chown -R ${toString uid}:${toString gid} .${userHome}
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chown -R ${toString uid}:${toString gid} nix
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'';
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config = {
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Cmd = [ "${userHome}/.nix-profile/bin/bash" ];
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User = "${toString uid}:${toString gid}";
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Env = [
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"USER=${uname}"
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"PATH=${lib.concatStringsSep ":" [
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"${userHome}/.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=${lib.concatStringsSep ":" [
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"${userHome}/.nix-profile/share/man"
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"/nix/var/nix/profiles/default/share/man"
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]}"
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"SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
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"GIT_SSL_CAINFO=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
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"NIX_SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
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"NIX_PATH=/nix/var/nix/profiles/per-user/${uname}/channels:${userHome}/.nix-defexpr/channels"
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];
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};
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}
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