265 lines
8.2 KiB
Nix
265 lines
8.2 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.virtualisation.podman;
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json = pkgs.formats.json { };
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inherit (lib) mkOption types;
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podmanPackage = pkgs.podman.override {
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extraPackages = cfg.extraPackages
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# setuid shadow
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++ [ "/run/wrappers" ]
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++ lib.optional (config.boot.supportedFilesystems.zfs or false) config.boot.zfs.package;
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extraRuntimes = [ pkgs.runc ]
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++ lib.optionals (config.virtualisation.containers.containersConf.settings.network.default_rootless_network_cmd or "" == "slirp4netns") (with pkgs; [
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slirp4netns
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]);
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};
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# Provides a fake "docker" binary mapping to podman
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dockerCompat = pkgs.runCommand "${podmanPackage.pname}-docker-compat-${podmanPackage.version}"
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{
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outputs = [ "out" "man" ];
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inherit (podmanPackage) meta;
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preferLocalBuild = true;
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} ''
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mkdir -p $out/bin
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ln -s ${podmanPackage}/bin/podman $out/bin/docker
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mkdir -p $man/share/man/man1
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for f in ${podmanPackage.man}/share/man/man1/*; do
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basename=$(basename $f | sed s/podman/docker/g)
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ln -s $f $man/share/man/man1/$basename
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done
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'';
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in
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{
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imports = [
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(lib.mkRemovedOptionModule [ "virtualisation" "podman" "defaultNetwork" "dnsname" ]
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"Use virtualisation.podman.defaultNetwork.settings.dns_enabled instead.")
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(lib.mkRemovedOptionModule [ "virtualisation" "podman" "defaultNetwork" "extraPlugins" ]
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"Netavark isn't compatible with CNI plugins.")
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./network-socket.nix
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];
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meta = {
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maintainers = lib.teams.podman.members;
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};
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options.virtualisation.podman = {
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enable =
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mkOption {
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type = types.bool;
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default = false;
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description = ''
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This option enables Podman, a daemonless container engine for
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developing, managing, and running OCI Containers on your Linux System.
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It is a drop-in replacement for the {command}`docker` command.
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'';
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};
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dockerSocket.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Make the Podman socket available in place of the Docker socket, so
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Docker tools can find the Podman socket.
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Podman implements the Docker API.
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Users must be in the `podman` group in order to connect. As
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with Docker, members of this group can gain root access.
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'';
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};
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dockerCompat = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Create an alias mapping {command}`docker` to {command}`podman`.
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'';
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};
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enableNvidia = mkOption {
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type = types.bool;
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default = false;
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description = ''
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**Deprecated**, please use hardware.nvidia-container-toolkit.enable instead.
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Enable use of Nvidia GPUs from within podman containers.
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'';
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};
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extraPackages = mkOption {
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type = with types; listOf package;
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default = [ ];
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example = lib.literalExpression ''
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[
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pkgs.gvisor
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]
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'';
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description = ''
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Extra packages to be installed in the Podman wrapper.
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'';
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};
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autoPrune = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to periodically prune Podman resources. If enabled, a
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systemd timer will run `podman system prune -f`
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as specified by the `dates` option.
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'';
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};
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flags = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "--all" ];
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description = ''
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Any additional flags passed to {command}`podman system prune`.
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'';
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};
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dates = mkOption {
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default = "weekly";
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type = types.str;
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description = ''
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Specification (in the format described by
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{manpage}`systemd.time(7)`) of the time at
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which the prune will occur.
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'';
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};
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};
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package = lib.mkOption {
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type = types.package;
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default = podmanPackage;
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internal = true;
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description = ''
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The final Podman package (including extra packages).
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'';
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};
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defaultNetwork.settings = lib.mkOption {
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type = json.type;
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default = { };
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example = lib.literalExpression "{ dns_enabled = true; }";
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description = ''
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Settings for podman's default network.
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'';
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};
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};
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config =
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let
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networkConfig = ({
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dns_enabled = false;
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driver = "bridge";
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id = "0000000000000000000000000000000000000000000000000000000000000000";
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internal = false;
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ipam_options = { driver = "host-local"; };
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ipv6_enabled = false;
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name = "podman";
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network_interface = "podman0";
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subnets = [{ gateway = "10.88.0.1"; subnet = "10.88.0.0/16"; }];
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} // cfg.defaultNetwork.settings);
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inherit (networkConfig) dns_enabled network_interface;
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in
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lib.mkIf cfg.enable {
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warnings = lib.optionals cfg.enableNvidia [
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''
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You have set virtualisation.podman.enableNvidia. This option is deprecated, please set hardware.nvidia-container-toolkit.enable instead.
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''
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];
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environment.systemPackages = [ cfg.package ]
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++ lib.optional cfg.dockerCompat dockerCompat;
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# https://github.com/containers/podman/blob/097cc6eb6dd8e598c0e8676d21267b4edb11e144/docs/tutorials/basic_networking.md#default-network
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environment.etc."containers/networks/podman.json" = lib.mkIf (cfg.defaultNetwork.settings != { }) {
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source = json.generate "podman.json" networkConfig;
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};
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# containers cannot reach aardvark-dns otherwise
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networking.firewall.interfaces.${network_interface}.allowedUDPPorts = lib.mkIf dns_enabled [ 53 ];
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virtualisation.containers = {
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enable = true; # Enable common /etc/containers configuration
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containersConf.settings = {
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network.network_backend = "netavark";
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};
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};
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systemd.packages = [ cfg.package ];
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systemd.services.podman-prune = {
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description = "Prune podman resources";
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restartIfChanged = false;
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unitConfig.X-StopOnRemoval = false;
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serviceConfig.Type = "oneshot";
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script = ''
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${cfg.package}/bin/podman system prune -f ${toString cfg.autoPrune.flags}
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'';
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startAt = lib.optional cfg.autoPrune.enable cfg.autoPrune.dates;
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after = [ "podman.service" ];
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requires = [ "podman.service" ];
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};
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systemd.services.podman.environment = config.networking.proxy.envVars;
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systemd.sockets.podman.wantedBy = [ "sockets.target" ];
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systemd.sockets.podman.socketConfig.SocketGroup = "podman";
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# Podman does not support multiple sockets, as of podman 5.0.2, so we use
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# a symlink. Unfortunately this does not let us use an alternate group,
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# such as `docker`.
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systemd.sockets.podman.socketConfig.Symlinks =
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lib.mkIf cfg.dockerSocket.enable [ "/run/docker.sock" ];
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systemd.user.services.podman.environment = config.networking.proxy.envVars;
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systemd.user.sockets.podman.wantedBy = [ "sockets.target" ];
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systemd.timers.podman-prune.timerConfig = lib.mkIf cfg.autoPrune.enable {
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Persistent = true;
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RandomizedDelaySec = 1800;
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};
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systemd.tmpfiles.packages = [
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# The /run/podman rule interferes with our podman group, so we remove
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# it and let the systemd socket logic take care of it.
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(pkgs.runCommand "podman-tmpfiles-nixos" {
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package = cfg.package;
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preferLocalBuild = true;
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} ''
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mkdir -p $out/lib/tmpfiles.d/
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grep -v 'D! /run/podman 0700 root root' \
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<$package/lib/tmpfiles.d/podman.conf \
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>$out/lib/tmpfiles.d/podman.conf
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'')
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];
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users.groups.podman = { };
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assertions = [
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{
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assertion = cfg.dockerCompat -> !config.virtualisation.docker.enable;
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message = "Option dockerCompat conflicts with docker";
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}
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{
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assertion = cfg.dockerSocket.enable -> !config.virtualisation.docker.enable;
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message = ''
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The options virtualisation.podman.dockerSocket.enable and virtualisation.docker.enable conflict, because only one can serve the socket.
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'';
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}
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];
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};
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}
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