Migrate docker module to podman

This also enables podman on mayushii.

machines/mayushii/configuration.nix

@@ -19,6 +19,7 @@
     gui.enable = true;
     media-proxy.enable = true;
     mullvad.enable = true;
+    podman.enable = true;
     restic.system = {
       enable = true;
       qos = true;

modules/default.nix

@@ -33,7 +33,6 @@
     ./ausweisapp.nix
     ./authoritative-dns.nix
     ./cups.nix
-    ./docker.nix
     ./fancontrol.nix
     ./flatpak.nix
     ./fonts.nix
@@ -55,6 +54,7 @@
     ./nix.nix
     ./office.nix
     ./pipewire.nix
+    ./podman.nix
     ./prometheus/node_exporter.nix
     ./pubkeys.nix
     ./qbittorrent

modules/docker.nix

@@ -1,47 +0,0 @@
-# SPDX-FileCopyrightText: 2020-2021 Simon Bruder <simon@sbruder.de>
-#
-# SPDX-License-Identifier: AGPL-3.0-or-later
-
-{ config, lib, pkgs, ... }:
-
-{
-  # This uses a custom option (instead of `virtualisation.docker.enable`) since
-  # `virtualisation.oci-containers` conditionally sets
-  # `virtualisation.docker.enable` and therefore causes an infinite recursion.
-  options.sbruder.docker.enable = lib.mkEnableOption "docker with ipv6nat";
-
-  config = lib.mkIf config.sbruder.docker.enable {
-    environment.systemPackages = with pkgs; [
-      docker-compose
-      docker-credential-helpers
-      docker-ls
-    ];
-
-    virtualisation = {
-      docker = {
-        enable = true;
-        logDriver = "journald";
-        extraOptions = lib.concatStringsSep " " [
-          "--ipv6"
-          "--fixed-cidr-v6=fd00:d0ce:d0ce:d0ce::/64"
-        ];
-      };
-
-      oci-containers.containers.ipv6nat = {
-        image = "robbertkl/ipv6nat";
-        volumes = [
-          "/var/run/docker.sock:/var/run/docker.sock:ro"
-        ];
-        extraOptions = [
-          "--network=host"
-          "--cap-drop=ALL"
-          "--cap-add=NET_ADMIN"
-          "--cap-add=NET_RAW"
-          "--cap-add=SYS_MODULE"
-        ];
-      };
-    };
-
-    environment.etc."modules-load.d/ipv6nat.conf".text = "ip6_tables\n";
-  };
-}

modules/podman.nix

@@ -0,0 +1,29 @@
+# SPDX-FileCopyrightText: 2020-2024 Simon Bruder <simon@sbruder.de>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+{ config, lib, pkgs, ... }:
+
+{
+  options.sbruder.podman.enable = lib.mkEnableOption "podman";
+
+  config = lib.mkIf config.sbruder.podman.enable {
+    boot.enableContainers = false; # FIXME: this only needs to be set for some stateVersions
+
+    environment.systemPackages = with pkgs; [
+      buildah
+      podman-compose
+      skopeo
+    ];
+
+    virtualisation = {
+      podman = {
+        enable = true;
+        dockerSocket.enable = true;
+        defaultNetwork.settings = {
+          ipv6_enabled = true;
+        };
+      };
+    };
+  };
+}

modules/restic/system.nix

@@ -28,6 +28,7 @@ let
     "/home/*/mounts"
 
     # Docker (state should be kept somewhere else)
+    "/home/*/.local/share/containers" # podman
     "/var/lib/docker/"
 
     # Static configuration (generated from this repository)