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-rw-r--r--nixos/modules/config/terminfo.nix28
-rw-r--r--nixos/modules/config/users-groups.nix1
-rw-r--r--nixos/modules/hardware/cpu/amd-sev.nix89
-rw-r--r--nixos/modules/hardware/glasgow.nix23
-rw-r--r--nixos/modules/installer/tools/tools.nix4
-rw-r--r--nixos/modules/module-list.nix4
-rw-r--r--nixos/modules/programs/fish.nix17
-rw-r--r--nixos/modules/security/sudo-rs.nix296
-rw-r--r--nixos/modules/services/games/xonotic.nix198
-rw-r--r--nixos/modules/services/matrix/synapse.nix43
-rw-r--r--nixos/modules/services/misc/mbpfan.nix19
-rw-r--r--nixos/modules/services/monitoring/prometheus/exporters.nix9
-rw-r--r--nixos/modules/services/monitoring/prometheus/exporters/blackbox.nix2
-rw-r--r--nixos/modules/services/monitoring/prometheus/exporters/nextcloud.nix15
-rw-r--r--nixos/modules/services/monitoring/prometheus/exporters/sabnzbd.nix47
-rw-r--r--nixos/modules/services/networking/frp.nix4
-rw-r--r--nixos/modules/services/networking/knot.nix132
-rw-r--r--nixos/modules/services/networking/mtr-exporter.nix111
-rw-r--r--nixos/modules/services/networking/networkmanager.nix42
-rw-r--r--nixos/modules/services/networking/nftables.nix1
-rw-r--r--nixos/modules/services/networking/ssh/sshd.nix21
-rw-r--r--nixos/modules/services/networking/wg-quick.nix2
-rw-r--r--nixos/modules/services/search/typesense.nix4
-rw-r--r--nixos/modules/services/security/vaultwarden/default.nix6
-rw-r--r--nixos/modules/services/web-apps/calibre-web.nix7
-rw-r--r--nixos/modules/services/web-apps/plausible.nix5
-rw-r--r--nixos/modules/services/web-apps/vikunja.nix4
-rw-r--r--nixos/modules/services/web-servers/garage.nix9
-rw-r--r--nixos/modules/services/x11/desktop-managers/plasma5.nix13
-rw-r--r--nixos/modules/services/x11/display-managers/gdm.nix18
-rwxr-xr-xnixos/modules/system/activation/switch-to-configuration.pl20
-rw-r--r--nixos/modules/tasks/network-interfaces-systemd.nix64
-rw-r--r--nixos/modules/virtualisation/google-compute-config.nix2
-rw-r--r--nixos/modules/virtualisation/oci-common.nix60
-rw-r--r--nixos/modules/virtualisation/oci-config-user.nix12
-rw-r--r--nixos/modules/virtualisation/oci-image.nix50
-rw-r--r--nixos/modules/virtualisation/oci-options.nix14
37 files changed, 1190 insertions, 206 deletions
diff --git a/nixos/modules/config/terminfo.nix b/nixos/modules/config/terminfo.nix
index 1ae8e82c471..d1dbc4e0d05 100644
--- a/nixos/modules/config/terminfo.nix
+++ b/nixos/modules/config/terminfo.nix
@@ -6,12 +6,26 @@ with lib;
 
 {
 
-  options.environment.enableAllTerminfo = with lib; mkOption {
-    default = false;
-    type = types.bool;
-    description = lib.mdDoc ''
-      Whether to install all terminfo outputs
-    '';
+  options = with lib; {
+    environment.enableAllTerminfo = mkOption {
+      default = false;
+      type = types.bool;
+      description = lib.mdDoc ''
+        Whether to install all terminfo outputs
+      '';
+    };
+
+    security.sudo.keepTerminfo = mkOption {
+      default = config.security.sudo.package.pname != "sudo-rs";
+      defaultText = literalMD ''
+        `true` unless using `sudo-rs`
+      '';
+      type = types.bool;
+      description = lib.mdDoc ''
+        Whether to preserve the `TERMINFO` and `TERMINFO_DIRS`
+        environment variables, for `root` and the `wheel` group.
+      '';
+    };
   };
 
   config = {
@@ -54,7 +68,7 @@ with lib;
       export TERM=$TERM
     '';
 
-    security.sudo.extraConfig = ''
+    security.sudo.extraConfig = mkIf config.security.sudo.keepTerminfo ''
 
       # Keep terminfo database for root and %wheel.
       Defaults:root,%wheel env_keep+=TERMINFO_DIRS
diff --git a/nixos/modules/config/users-groups.nix b/nixos/modules/config/users-groups.nix
index 5158974c27b..785084209b0 100644
--- a/nixos/modules/config/users-groups.nix
+++ b/nixos/modules/config/users-groups.nix
@@ -700,6 +700,7 @@ in {
 
     environment.profiles = [
       "$HOME/.nix-profile"
+      "\${XDG_STATE_HOME:-$HOME/.local/state}/nix/profile"
       "/etc/profiles/per-user/$USER"
     ];
 
diff --git a/nixos/modules/hardware/cpu/amd-sev.nix b/nixos/modules/hardware/cpu/amd-sev.nix
index 28ee07f005b..08e1de49638 100644
--- a/nixos/modules/hardware/cpu/amd-sev.nix
+++ b/nixos/modules/hardware/cpu/amd-sev.nix
@@ -1,37 +1,43 @@
-{ config, lib, ... }:
+{ config, options, lib, ... }:
 with lib;
 let
-  cfg = config.hardware.cpu.amd.sev;
-  defaultGroup = "sev";
-in
-  with lib; {
-    options.hardware.cpu.amd.sev = {
-      enable = mkEnableOption (lib.mdDoc "access to the AMD SEV device");
-      user = mkOption {
-        description = lib.mdDoc "Owner to assign to the SEV device.";
-        type = types.str;
-        default = "root";
-      };
-      group = mkOption {
-        description = lib.mdDoc "Group to assign to the SEV device.";
-        type = types.str;
-        default = defaultGroup;
-      };
-      mode = mkOption {
-        description = lib.mdDoc "Mode to set for the SEV device.";
-        type = types.str;
-        default = "0660";
-      };
+  cfgSev = config.hardware.cpu.amd.sev;
+  cfgSevGuest = config.hardware.cpu.amd.sevGuest;
+
+  optionsFor = device: group: {
+    enable = mkEnableOption (lib.mdDoc "access to the AMD ${device} device");
+    user = mkOption {
+      description = lib.mdDoc "Owner to assign to the ${device} device.";
+      type = types.str;
+      default = "root";
+    };
+    group = mkOption {
+      description = lib.mdDoc "Group to assign to the ${device} device.";
+      type = types.str;
+      default = group;
     };
+    mode = mkOption {
+      description = lib.mdDoc "Mode to set for the ${device} device.";
+      type = types.str;
+      default = "0660";
+    };
+  };
+in
+with lib; {
+  options.hardware.cpu.amd.sev = optionsFor "SEV" "sev";
+
+  options.hardware.cpu.amd.sevGuest = optionsFor "SEV guest" "sev-guest";
 
-    config = mkIf cfg.enable {
+  config = mkMerge [
+    # /dev/sev
+    (mkIf cfgSev.enable {
       assertions = [
         {
-          assertion = hasAttr cfg.user config.users.users;
+          assertion = hasAttr cfgSev.user config.users.users;
           message = "Given user does not exist";
         }
         {
-          assertion = (cfg.group == defaultGroup) || (hasAttr cfg.group config.users.groups);
+          assertion = (cfgSev.group == options.hardware.cpu.amd.sev.group.default) || (hasAttr cfgSev.group config.users.groups);
           message = "Given group does not exist";
         }
       ];
@@ -40,12 +46,35 @@ in
         options kvm_amd sev=1
       '';
 
-      users.groups = optionalAttrs (cfg.group == defaultGroup) {
-        "${cfg.group}" = {};
+      users.groups = optionalAttrs (cfgSev.group == options.hardware.cpu.amd.sev.group.default) {
+        "${cfgSev.group}" = { };
       };
 
-      services.udev.extraRules = with cfg; ''
+      services.udev.extraRules = with cfgSev; ''
         KERNEL=="sev", OWNER="${user}", GROUP="${group}", MODE="${mode}"
       '';
-    };
-  }
+    })
+
+    # /dev/sev-guest
+    (mkIf cfgSevGuest.enable {
+      assertions = [
+        {
+          assertion = hasAttr cfgSevGuest.user config.users.users;
+          message = "Given user does not exist";
+        }
+        {
+          assertion = (cfgSevGuest.group == options.hardware.cpu.amd.sevGuest.group.default) || (hasAttr cfgSevGuest.group config.users.groups);
+          message = "Given group does not exist";
+        }
+      ];
+
+      users.groups = optionalAttrs (cfgSevGuest.group == options.hardware.cpu.amd.sevGuest.group.default) {
+        "${cfgSevGuest.group}" = { };
+      };
+
+      services.udev.extraRules = with cfgSevGuest; ''
+        KERNEL=="sev-guest", OWNER="${user}", GROUP="${group}", MODE="${mode}"
+      '';
+    })
+  ];
+}
diff --git a/nixos/modules/hardware/glasgow.nix b/nixos/modules/hardware/glasgow.nix
new file mode 100644
index 00000000000..f8ebb772c47
--- /dev/null
+++ b/nixos/modules/hardware/glasgow.nix
@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.hardware.glasgow;
+
+in
+{
+  options.hardware.glasgow = {
+    enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = lib.mdDoc ''
+        Enables Glasgow udev rules and ensures 'plugdev' group exists.
+        This is a prerequisite to using Glasgow without being root.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.udev.packages = [ pkgs.glasgow ];
+    users.groups.plugdev = { };
+  };
+}
diff --git a/nixos/modules/installer/tools/tools.nix b/nixos/modules/installer/tools/tools.nix
index 6564b583464..78bcbbe2db5 100644
--- a/nixos/modules/installer/tools/tools.nix
+++ b/nixos/modules/installer/tools/tools.nix
@@ -134,8 +134,8 @@ in
 
     system.nixos-generate-config.configuration = mkDefault ''
       # Edit this configuration file to define what should be installed on
-      # your system.  Help is available in the configuration.nix(5) man page
-      # and in the NixOS manual (accessible by running `nixos-help`).
+      # your system. Help is available in the configuration.nix(5) man page, on
+      # https://search.nixos.org/options and in the NixOS manual (`nixos-help`).
 
       { config, lib, pkgs, ... }:
 
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 811a46563fb..206d5eaf75d 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -61,6 +61,7 @@
   ./hardware/flipperzero.nix
   ./hardware/flirc.nix
   ./hardware/gkraken.nix
+  ./hardware/glasgow.nix
   ./hardware/gpgsmartcards.nix
   ./hardware/hackrf.nix
   ./hardware/i2c.nix
@@ -310,6 +311,7 @@
   ./security/rngd.nix
   ./security/rtkit.nix
   ./security/sudo.nix
+  ./security/sudo-rs.nix
   ./security/systemd-confinement.nix
   ./security/tpm2.nix
   ./security/wrappers/default.nix
@@ -497,6 +499,7 @@
   ./services/games/quake3-server.nix
   ./services/games/teeworlds.nix
   ./services/games/terraria.nix
+  ./services/games/xonotic.nix
   ./services/hardware/acpid.nix
   ./services/hardware/actkbd.nix
   ./services/hardware/argonone.nix
@@ -1483,6 +1486,7 @@
   ./virtualisation/nixos-containers.nix
   ./virtualisation/oci-containers.nix
   ./virtualisation/openstack-options.nix
+  ./virtualisation/oci-options.nix
   ./virtualisation/openvswitch.nix
   ./virtualisation/parallels-guest.nix
   ./virtualisation/podman/default.nix
diff --git a/nixos/modules/programs/fish.nix b/nixos/modules/programs/fish.nix
index c85097f45e9..b500b8f24b2 100644
--- a/nixos/modules/programs/fish.nix
+++ b/nixos/modules/programs/fish.nix
@@ -258,16 +258,13 @@ in
             preferLocalBuild = true;
             allowSubstitutes = false;
           };
-          generateCompletions = package: pkgs.runCommand
-            "${package.name}_fish-completions"
-            (
-              {
-                inherit package;
-                preferLocalBuild = true;
-                allowSubstitutes = false;
-              }
-              // optionalAttrs (package ? meta.priority) { meta.priority = package.meta.priority; }
-            )
+          generateCompletions = package: pkgs.runCommandLocal
+            ( with lib.strings; let
+                storeLength = stringLength storeDir + 34; # Nix' StorePath::HashLen + 2 for the separating slash and dash
+                pathName = substring storeLength (stringLength package - storeLength) package;
+              in (package.name or pathName) + "_fish-completions")
+            ( { inherit package; } //
+              optionalAttrs (package ? meta.priority) { meta.priority = package.meta.priority; })
             ''
               mkdir -p $out
               if [ -d $package/share/man ]; then
diff --git a/nixos/modules/security/sudo-rs.nix b/nixos/modules/security/sudo-rs.nix
new file mode 100644
index 00000000000..6b8f09a8d3d
--- /dev/null
+++ b/nixos/modules/security/sudo-rs.nix
@@ -0,0 +1,296 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  inherit (pkgs) sudo sudo-rs;
+
+  cfg = config.security.sudo-rs;
+
+  enableSSHAgentAuth =
+    with config.security;
+    pam.enableSSHAgentAuth && pam.sudo.sshAgentAuth;
+
+  usingMillersSudo = cfg.package.pname == sudo.pname;
+  usingSudoRs = cfg.package.pname == sudo-rs.pname;
+
+  toUserString = user: if (isInt user) then "#${toString user}" else "${user}";
+  toGroupString = group: if (isInt group) then "%#${toString group}" else "%${group}";
+
+  toCommandOptionsString = options:
+    "${concatStringsSep ":" options}${optionalString (length options != 0) ":"} ";
+
+  toCommandsString = commands:
+    concatStringsSep ", " (
+      map (command:
+        if (isString command) then
+          command
+        else
+          "${toCommandOptionsString command.options}${command.command}"
+      ) commands
+    );
+
+in
+
+{
+
+  ###### interface
+
+  options.security.sudo-rs = {
+
+    defaultOptions = mkOption {
+      type = with types; listOf str;
+      default = optional usingMillersSudo "SETENV";
+      defaultText = literalMD ''
+        `[ "SETENV" ]` if using the default `sudo` implementation
+      '';
+      description = mdDoc ''
+        Options used for the default rules, granting `root` and the
+        `wheel` group permission to run any command as any user.
+      '';
+    };
+
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = mdDoc ''
+        Whether to enable the {command}`sudo` command, which
+        allows non-root users to execute commands as root.
+      '';
+    };
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.sudo-rs;
+      defaultText = literalExpression "pkgs.sudo-rs";
+      description = mdDoc ''
+        Which package to use for `sudo`.
+      '';
+    };
+
+    wheelNeedsPassword = mkOption {
+      type = types.bool;
+      default = true;
+      description = mdDoc ''
+        Whether users of the `wheel` group must
+        provide a password to run commands as super user via {command}`sudo`.
+      '';
+      };
+
+    execWheelOnly = mkOption {
+      type = types.bool;
+      default = false;
+      description = mdDoc ''
+        Only allow members of the `wheel` group to execute sudo by
+        setting the executable's permissions accordingly.
+        This prevents users that are not members of `wheel` from
+        exploiting vulnerabilities in sudo such as CVE-2021-3156.
+      '';
+    };
+
+    configFile = mkOption {
+      type = types.lines;
+      # Note: if syntax errors are detected in this file, the NixOS
+      # configuration will fail to build.
+      description = mdDoc ''
+        This string contains the contents of the
+        {file}`sudoers` file.
+      '';
+    };
+
+    extraRules = mkOption {
+      description = mdDoc ''
+        Define specific rules to be in the {file}`sudoers` file.
+        More specific rules should come after more general ones in order to
+        yield the expected behavior. You can use mkBefore/mkAfter to ensure
+        this is the case when configuration options are merged.
+      '';
+      default = [];
+      example = literalExpression ''
+        [
+          # Allow execution of any command by all users in group sudo,
+          # requiring a password.
+          { groups = [ "sudo" ]; commands = [ "ALL" ]; }
+
+          # Allow execution of "/home/root/secret.sh" by user `backup`, `database`
+          # and the group with GID `1006` without a password.
+          { users = [ "backup" "database" ]; groups = [ 1006 ];
+            commands = [ { command = "/home/root/secret.sh"; options = [ "SETENV" "NOPASSWD" ]; } ]; }
+
+          # Allow all users of group `bar` to run two executables as user `foo`
+          # with arguments being pre-set.
+          { groups = [ "bar" ]; runAs = "foo";
+            commands =
+              [ "/home/baz/cmd1.sh hello-sudo"
+                  { command = '''/home/baz/cmd2.sh ""'''; options = [ "SETENV" ]; } ]; }
+        ]
+      '';
+      type = with types; listOf (submodule {
+        options = {
+          users = mkOption {
+            type = with types; listOf (either str int);
+            description = mdDoc ''
+              The usernames / UIDs this rule should apply for.
+            '';
+            default = [];
+          };
+
+          groups = mkOption {
+            type = with types; listOf (either str int);
+            description = mdDoc ''
+              The groups / GIDs this rule should apply for.
+            '';
+            default = [];
+          };
+
+          host = mkOption {
+            type = types.str;
+            default = "ALL";
+            description = mdDoc ''
+              For what host this rule should apply.
+            '';
+          };
+
+          runAs = mkOption {
+            type = with types; str;
+            default = "ALL:ALL";
+            description = mdDoc ''
+              Under which user/group the specified command is allowed to run.
+
+              A user can be specified using just the username: `"foo"`.
+              It is also possible to specify a user/group combination using `"foo:bar"`
+              or to only allow running as a specific group with `":bar"`.
+            '';
+          };
+
+          commands = mkOption {
+            description = mdDoc ''
+              The commands for which the rule should apply.
+            '';
+            type = with types; listOf (either str (submodule {
+
+              options = {
+                command = mkOption {
+                  type = with types; str;
+                  description = mdDoc ''
+                    A command being either just a path to a binary to allow any arguments,
+                    the full command with arguments pre-set or with `""` used as the argument,
+                    not allowing arguments to the command at all.
+                  '';
+                };
+
+                options = mkOption {
+                  type = with types; listOf (enum [ "NOPASSWD" "PASSWD" "NOEXEC" "EXEC" "SETENV" "NOSETENV" "LOG_INPUT" "NOLOG_INPUT" "LOG_OUTPUT" "NOLOG_OUTPUT" ]);
+                  description = mdDoc ''
+                    Options for running the command. Refer to the [sudo manual](https://www.sudo.ws/man/1.7.10/sudoers.man.html).
+                  '';
+                  default = [];
+                };
+              };
+
+            }));
+          };
+        };
+      });
+    };
+
+    extraConfig = mkOption {
+      type = types.lines;
+      default = "";
+      description = mdDoc ''
+        Extra configuration text appended to {file}`sudoers`.
+      '';
+    };
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+    security.sudo-rs.extraRules =
+      let
+        defaultRule = { users ? [], groups ? [], opts ? [] }: [ {
+          inherit users groups;
+          commands = [ {
+            command = "ALL";
+            options = opts ++ cfg.defaultOptions;
+          } ];
+        } ];
+      in mkMerge [
+        # This is ordered before users' `mkBefore` rules,
+        # so as not to introduce unexpected changes.
+        (mkOrder 400 (defaultRule { users = [ "root" ]; }))
+
+        # This is ordered to show before (most) other rules, but
+        # late-enough for a user to `mkBefore` it.
+        (mkOrder 600 (defaultRule {
+          groups = [ "wheel" ];
+          opts = (optional (!cfg.wheelNeedsPassword) "NOPASSWD");
+        }))
+      ];
+
+    security.sudo-rs.configFile = concatStringsSep "\n" (filter (s: s != "") [
+      ''
+        # Don't edit this file. Set the NixOS options ‘security.sudo-rs.configFile’
+        # or ‘security.sudo-rs.extraRules’ instead.
+      ''
+      (optionalString enableSSHAgentAuth ''
+        # Keep SSH_AUTH_SOCK so that pam_ssh_agent_auth.so can do its magic.
+        Defaults env_keep+=SSH_AUTH_SOCK
+      '')
+      (concatStringsSep "\n" (
+        lists.flatten (
+          map (
+            rule: optionals (length rule.commands != 0) [
+              (map (user: "${toUserString user}	${rule.host}=(${rule.runAs})	${toCommandsString rule.commands}") rule.users)
+              (map (group: "${toGroupString group}	${rule.host}=(${rule.runAs})	${toCommandsString rule.commands}") rule.groups)
+            ]
+          ) cfg.extraRules
+        )
+      ) + "\n")
+      (optionalString (cfg.extraConfig != "") ''
+        # extraConfig
+        ${cfg.extraConfig}
+      '')
+    ]);
+
+    security.wrappers = let
+      owner = "root";
+      group = if cfg.execWheelOnly then "wheel" else "root";
+      setuid = true;
+      permissions = if cfg.execWheelOnly then "u+rx,g+x" else "u+rx,g+x,o+x";
+    in {
+      sudo = {
+        source = "${cfg.package.out}/bin/sudo";
+        inherit owner group setuid permissions;
+      };
+      # sudo-rs does not yet ship a sudoedit (as of v0.2.0)
+      sudoedit = mkIf usingMillersSudo {
+        source = "${cfg.package.out}/bin/sudoedit";
+        inherit owner group setuid permissions;
+      };
+    };
+
+    environment.systemPackages = [ sudo ];
+
+    security.pam.services.sudo = { sshAgentAuth = true; usshAuth = true; };
+    security.pam.services.sudo-i = mkIf usingSudoRs
+      { sshAgentAuth = true; usshAuth = true; };
+
+    environment.etc.sudoers =
+      { source =
+          pkgs.runCommand "sudoers"
+          {
+            src = pkgs.writeText "sudoers-in" cfg.configFile;
+            preferLocalBuild = true;
+          }
+          "${pkgs.buildPackages."${cfg.package.pname}"}/bin/visudo -f $src -c && cp $src $out";
+        mode = "0440";
+      };
+
+  };
+
+  meta.maintainers = [ lib.maintainers.nicoo ];
+
+}
diff --git a/nixos/modules/services/games/xonotic.nix b/nixos/modules/services/games/xonotic.nix
new file mode 100644
index 00000000000..c84347ddc98
--- /dev/null
+++ b/nixos/modules/services/games/xonotic.nix
@@ -0,0 +1,198 @@
+{ config
+, pkgs
+, lib
+, ...
+}:
+
+let
+  cfg = config.services.xonotic;
+
+  serverCfg = pkgs.writeText "xonotic-server.cfg" (
+    toString cfg.prependConfig
+      + "\n"
+      + builtins.concatStringsSep "\n" (
+        lib.mapAttrsToList (key: option:
+          let
+            escape = s: lib.escape [ "\"" ] s;
+            quote = s: "\"${s}\"";
+
+            toValue = x: quote (escape (toString x));
+
+            value = (if lib.isList option then
+              builtins.concatStringsSep
+                " "
+                (builtins.map (x: toValue x) option)
+            else
+              toValue option
+            );
+          in
+          "${key} ${value}"
+        ) cfg.settings
+      )
+      + "\n"
+      + toString cfg.appendConfig
+  );
+in
+
+{
+  options.services.xonotic = {
+    enable = lib.mkEnableOption (lib.mdDoc "Xonotic dedicated server");
+
+    package = lib.mkPackageOption pkgs "xonotic-dedicated" {};
+
+    openFirewall = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = lib.mdDoc ''
+        Open the firewall for TCP and UDP on the specified port.
+      '';
+    };
+
+    dataDir = lib.mkOption {
+      type = lib.types.path;
+      readOnly = true;
+      default = "/var/lib/xonotic";
+      description = lib.mdDoc ''
+        Data directory.
+      '';
+    };
+
+    settings = lib.mkOption {
+      description = lib.mdDoc ''
+        Generates the `server.cfg` file. Refer to [upstream's example][0] for
+        details.
+
+        [0]: https://gitlab.com/xonotic/xonotic/-/blob/master/server/server.cfg
+      '';
+      default = {};
+      type = lib.types.submodule {
+        freeformType = with lib.types; let
+          scalars = oneOf [ singleLineStr int float ];
+        in
+        attrsOf (oneOf [ scalars (nonEmptyListOf scalars) ]);
+
+        options.sv_public = lib.mkOption {
+          type = lib.types.int;
+          default = 0;
+          example = [ (-1) 1 ];
+          description = lib.mdDoc ''
+            Controls whether the server will be publicly listed.
+          '';
+        };
+
+        options.hostname = lib.mkOption {
+          type = lib.types.singleLineStr;
+          default = "Xonotic $g_xonoticversion Server";
+          description = lib.mdDoc ''
+            The name that will appear in the server list. `$g_xonoticversion`
+            gets replaced with the current version.
+          '';
+        };
+
+        options.sv_motd = lib.mkOption {
+          type = lib.types.singleLineStr;
+          default = "";
+          description = lib.mdDoc ''
+            Text displayed when players join the server.
+          '';
+        };
+
+        options.sv_termsofservice_url = lib.mkOption {
+          type = lib.types.singleLineStr;
+          default = "";
+          description = lib.mdDoc ''
+            URL for the Terms of Service for playing on your server.
+          '';
+        };
+
+        options.maxplayers = lib.mkOption {
+          type = lib.types.int;
+          default = 16;
+          description = lib.mdDoc ''
+            Number of player slots on the server, including spectators.
+          '';
+        };
+
+        options.net_address = lib.mkOption {
+          type = lib.types.singleLineStr;
+          default = "0.0.0.0";
+          description = lib.mdDoc ''
+            The address Xonotic will listen on.
+          '';
+        };
+
+        options.port = lib.mkOption {
+          type = lib.types.port;
+          default = 26000;
+          description = lib.mdDoc ''
+            The port Xonotic will listen on.
+          '';
+        };
+      };
+    };
+
+    # Still useful even though we're using RFC 42 settings because *some* keys
+    # can be repeated.
+    appendConfig = lib.mkOption {
+      type = with lib.types; nullOr lines;
+      default = null;
+      description = lib.mdDoc ''
+        Literal text to insert at the end of `server.cfg`.
+      '';
+    };
+
+    # Certain changes need to happen at the beginning of the file.
+    prependConfig = lib.mkOption {
+      type = with lib.types; nullOr lines;
+      default = null;
+      description = lib.mdDoc ''
+        Literal text to insert at the start of `server.cfg`.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.xonotic = {
+      description = "Xonotic server";
+      wantedBy = [ "multi-user.target" ];
+
+      environment = {
+        # Required or else it tries to write the lock file into the nix store
+        HOME = cfg.dataDir;
+      };
+
+      serviceConfig = {
+        DynamicUser = true;
+        User = "xonotic";
+        StateDirectory = "xonotic";
+        ExecStart = "${cfg.package}/bin/xonotic-dedicated";
+
+        # Symlink the configuration from the nix store to where Xonotic actually
+        # looks for it
+        ExecStartPre = [
+          "${pkgs.coreutils}/bin/mkdir -p ${cfg.dataDir}/.xonotic/data"
+          ''
+            ${pkgs.coreutils}/bin/ln -sf ${serverCfg} \
+              ${cfg.dataDir}/.xonotic/data/server.cfg
+          ''
+        ];
+
+        # Cargo-culted from search results about writing Xonotic systemd units
+        ExecReload = "${pkgs.util-linux}/bin/kill -HUP $MAINPID";
+
+        Restart = "on-failure";
+        RestartSec = 10;
+        StartLimitBurst = 5;
+      };
+    };
+
+    networking.firewall.allowedTCPPorts = lib.mkIf cfg.openFirewall [
+      cfg.settings.port
+    ];
+    networking.firewall.allowedUDPPorts = lib.mkIf cfg.openFirewall [
+      cfg.settings.port
+    ];
+  };
+
+  meta.maintainers = with lib.maintainers; [ CobaltCause ];
+}
diff --git a/nixos/modules/services/matrix/synapse.nix b/nixos/modules/services/matrix/synapse.nix
index 554e9ca2ecc..1354a8cb58b 100644
--- a/nixos/modules/services/matrix/synapse.nix
+++ b/nixos/modules/services/matrix/synapse.nix
@@ -15,26 +15,26 @@ let
     usePostgresql && (!(args ? host) || (elem args.host [ "localhost" "127.0.0.1" "::1" ]));
   hasWorkers = cfg.workers != { };
 
+  listenerSupportsResource = resource: listener:
+    lib.any ({ names, ... }: builtins.elem resource names) listener.resources;
+
+  clientListener = findFirst
+    (listenerSupportsResource "client")
+    null
+    (cfg.settings.listeners
+      ++ concatMap ({ worker_listeners, ... }: worker_listeners) (attrValues cfg.workers));
+
   registerNewMatrixUser =
     let
-      isIpv6 = x: lib.length (lib.splitString ":" x) > 1;
-      listener =
-        lib.findFirst (
-          listener: lib.any (
-            resource: lib.any (
-              name: name == "client"
-            ) resource.names
-          ) listener.resources
-        ) (lib.last cfg.settings.listeners) cfg.settings.listeners;
-        # FIXME: Handle cases with missing client listener properly,
-        # don't rely on lib.last, this will not work.
+      isIpv6 = hasInfix ":";
 
       # add a tail, so that without any bind_addresses we still have a useable address
-      bindAddress = head (listener.bind_addresses ++ [ "127.0.0.1" ]);
-      listenerProtocol = if listener.tls
+      bindAddress = head (clientListener.bind_addresses ++ [ "127.0.0.1" ]);
+      listenerProtocol = if clientListener.tls
         then "https"
         else "http";
     in
+    assert assertMsg (clientListener != null) "No client listener found in synapse or one of its workers";
     pkgs.writeShellScriptBin "matrix-synapse-register_new_matrix_user" ''
       exec ${cfg.package}/bin/register_new_matrix_user \
         $@ \
@@ -44,7 +44,7 @@ let
             "[${bindAddress}]"
           else
             "${bindAddress}"
-        }:${builtins.toString listener.port}/"
+        }:${builtins.toString clientListener.port}/"
     '';
 
   defaultExtras = [
@@ -938,6 +938,13 @@ in {
   config = mkIf cfg.enable {
     assertions = [
       {
+        assertion = clientListener != null;
+        message = ''
+          At least one listener which serves the `client` resource via HTTP is required
+          by synapse in `services.matrix-synapse.settings.listeners` or in one of the workers!
+        '';
+      }
+      {
         assertion = hasLocalPostgresDB -> config.services.postgresql.enable;
         message = ''
           Cannot deploy matrix-synapse with a configuration for a local postgresql database
@@ -969,13 +976,13 @@ in {
               (
                 listener:
                   listener.port == main.port
-                  && (lib.any (resource: builtins.elem "replication" resource.names) listener.resources)
+                  && listenerSupportsResource "replication" listener
                   && (lib.any (bind: bind == main.host || bind == "0.0.0.0" || bind == "::") listener.bind_addresses)
               )
               null
               cfg.settings.listeners;
           in
-          hasWorkers -> (listener != null);
+          hasWorkers -> (cfg.settings.instance_map ? main && listener != null);
         message = ''
           Workers for matrix-synapse require setting `services.matrix-synapse.settings.instance_map.main`
           to any listener configured in `services.matrix-synapse.settings.listeners` with a `"replication"`
@@ -1015,7 +1022,7 @@ in {
 
     systemd.targets.matrix-synapse = lib.mkIf hasWorkers {
       description = "Synapse Matrix parent target";
-      after = [ "network.target" ] ++ optional hasLocalPostgresDB "postgresql.service";
+      after = [ "network-online.target" ] ++ optional hasLocalPostgresDB "postgresql.service";
       wantedBy = [ "multi-user.target" ];
     };
 
@@ -1029,7 +1036,7 @@ in {
             unitConfig.ReloadPropagatedFrom = "matrix-synapse.target";
           }
           else {
-            after = [ "network.target" ] ++ optional hasLocalPostgresDB "postgresql.service";
+            after = [ "network-online.target" ] ++ optional hasLocalPostgresDB "postgresql.service";
             wantedBy = [ "multi-user.target" ];
           };
         baseServiceConfig = {
diff --git a/nixos/modules/services/misc/mbpfan.nix b/nixos/modules/services/misc/mbpfan.nix
index e75c3525414..8f64fb2d9c5 100644
--- a/nixos/modules/services/misc/mbpfan.nix
+++ b/nixos/modules/services/misc/mbpfan.nix
@@ -26,7 +26,7 @@ in {
 
     aggressive = mkOption {
       type = types.bool;
-      default = false;
+      default = true;
       description = lib.mdDoc "If true, favors higher default fan speeds.";
     };
 
@@ -38,17 +38,20 @@ in {
 
         options.general.low_temp = mkOption {
           type = types.int;
-          default = 63;
+          default = (if cfg.aggressive then 55 else 63);
+          defaultText = literalExpression "55";
           description = lib.mdDoc "If temperature is below this, fans will run at minimum speed.";
         };
         options.general.high_temp = mkOption {
           type = types.int;
-          default = 66;
+          default = (if cfg.aggressive then 58 else 66);
+          defaultText = literalExpression "58";
           description = lib.mdDoc "If temperature is above this, fan speed will gradually increase.";
         };
         options.general.max_temp = mkOption {
           type = types.int;
-          default = 86;
+          default = (if cfg.aggressive then 78 else 86);
+          defaultText = literalExpression "78";
           description = lib.mdDoc "If temperature is above this, fans will run at maximum speed.";
         };
         options.general.polling_interval = mkOption {
@@ -70,13 +73,6 @@ in {
   ];
 
   config = mkIf cfg.enable {
-    services.mbpfan.settings = mkIf cfg.aggressive {
-      general.min_fan1_speed = mkDefault 2000;
-      general.low_temp = mkDefault 55;
-      general.high_temp = mkDefault 58;
-      general.max_temp = mkDefault 70;
-    };
-
     boot.kernelModules = [ "coretemp" "applesmc" ];
     environment.systemPackages = [ cfg.package ];
     environment.etc."mbpfan.conf".source = settingsFile;
@@ -86,6 +82,7 @@ in {
       wantedBy = [ "sysinit.target" ];
       after = [ "syslog.target" "sysinit.target" ];
       restartTriggers = [ config.environment.etc."mbpfan.conf".source ];
+
       serviceConfig = {
         Type = "simple";
         ExecStart = "${cfg.package}/bin/mbpfan -f${verbose}";
diff --git a/nixos/modules/services/monitoring/prometheus/exporters.nix b/nixos/modules/services/monitoring/prometheus/exporters.nix
index 8bb017894ee..1d06893bf1d 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters.nix
@@ -68,6 +68,7 @@ let
     "redis"
     "rspamd"
     "rtl_433"
+    "sabnzbd"
     "scaphandre"
     "script"
     "shelly"
@@ -304,6 +305,14 @@ in
           'services.mysql.enable' is set to false.
       '';
     } {
+      assertion = cfg.nextcloud.enable -> (
+        (cfg.nextcloud.passwordFile == null) != (cfg.nextcloud.tokenFile == null)
+      );
+      message = ''
+        Please specify either 'services.prometheus.exporters.nextcloud.passwordFile' or
+          'services.prometheus.exporters.nextcloud.tokenFile'
+      '';
+    } {
       assertion = cfg.sql.enable -> (
         (cfg.sql.configFile == null) != (cfg.sql.configuration == null)
       );
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/blackbox.nix b/nixos/modules/services/monitoring/prometheus/exporters/blackbox.nix
index 66eaed51d2e..407bff1d62d 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters/blackbox.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters/blackbox.nix
@@ -21,7 +21,7 @@ let
       throw
       "${logPrefix}: configuration file must not reside within /tmp - it won't be visible to the systemd service."
     else
-      true;
+      file;
   checkConfig = file:
     pkgs.runCommand "checked-blackbox-exporter.conf" {
       preferLocalBuild = true;
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/nextcloud.nix b/nixos/modules/services/monitoring/prometheus/exporters/nextcloud.nix
index 28add020f5c..28a3eb6a134 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters/nextcloud.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters/nextcloud.nix
@@ -23,10 +23,12 @@ in
       description = lib.mdDoc ''
         Username for connecting to Nextcloud.
         Note that this account needs to have admin privileges in Nextcloud.
+        Unused when using token authentication.
       '';
     };
     passwordFile = mkOption {
-      type = types.path;
+      type = types.nullOr types.path;
+      default = null;
       example = "/path/to/password-file";
       description = lib.mdDoc ''
         File containing the password for connecting to Nextcloud.
@@ -34,9 +36,9 @@ in
       '';
     };
     tokenFile = mkOption {
-      type = types.path;
+      type = types.nullOr types.path;
+      default = null;
       example = "/path/to/token-file";
-      default = "";
       description = lib.mdDoc ''
         File containing the token for connecting to Nextcloud.
         Make sure that this file is readable by the exporter user.
@@ -58,12 +60,13 @@ in
           --addr ${cfg.listenAddress}:${toString cfg.port} \
           --timeout ${cfg.timeout} \
           --server ${cfg.url} \
-          ${if cfg.tokenFile == "" then ''
+          ${if cfg.passwordFile != null then ''
             --username ${cfg.username} \
             --password ${escapeShellArg "@${cfg.passwordFile}"} \
-         '' else ''
+          '' else ''
             --auth-token ${escapeShellArg "@${cfg.tokenFile}"} \
-         ''} ${concatStringsSep " \\\n  " cfg.extraFlags}'';
+          ''} \
+          ${concatStringsSep " \\\n  " cfg.extraFlags}'';
     };
   };
 }
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/sabnzbd.nix b/nixos/modules/services/monitoring/prometheus/exporters/sabnzbd.nix
new file mode 100644
index 00000000000..41127749401
--- /dev/null
+++ b/nixos/modules/services/monitoring/prometheus/exporters/sabnzbd.nix
@@ -0,0 +1,47 @@
+{ config, lib, pkgs, options }:
+
+let
+  inherit (lib) mkOption types;
+  cfg = config.services.prometheus.exporters.sabnzbd;
+in
+{
+  port = 9387;
+
+  extraOpts = {
+    servers = mkOption {
+      description = "List of sabnzbd servers to connect to.";
+      type = types.listOf (types.submodule {
+        options = {
+          baseUrl = mkOption {
+            type = types.str;
+            description = "Base URL of the sabnzbd server.";
+            example = "http://localhost:8080/sabnzbd";
+          };
+          apiKeyFile = mkOption {
+            type = types.str;
+            description = "File containing the API key.";
+            example = "/run/secrets/sabnzbd_apikey";
+          };
+        };
+      });
+    };
+  };
+
+  serviceOpts =
+    let
+      servers = lib.zipAttrs cfg.servers;
+      apiKeys = lib.concatStringsSep "," (builtins.map (file: "$(cat ${file})") servers.apiKeyFile);
+    in
+    {
+      environment = {
+        METRICS_PORT = toString cfg.port;
+        METRICS_ADDR = cfg.listenAddress;
+        SABNZBD_BASEURLS = lib.concatStringsSep "," servers.baseUrl;
+      };
+
+      script = ''
+        export SABNZBD_APIKEYS="${apiKeys}"
+        exec ${lib.getExe pkgs.prometheus-sabnzbd-exporter}
+      '';
+    };
+}
diff --git a/nixos/modules/services/networking/frp.nix b/nixos/modules/services/networking/frp.nix
index 09d2b773630..e4f9a220b5e 100644
--- a/nixos/modules/services/networking/frp.nix
+++ b/nixos/modules/services/networking/frp.nix
@@ -31,8 +31,8 @@ in
         default = { };
         description = mdDoc ''
           Frp configuration, for configuration options
-          see the example of [client](https://github.com/fatedier/frp/blob/dev/conf/frpc_full.ini)
-          or [server](https://github.com/fatedier/frp/blob/dev/conf/frps_full.ini) on github.
+          see the example of [client](https://github.com/fatedier/frp/blob/dev/conf/frpc_legacy_full.ini)
+          or [server](https://github.com/fatedier/frp/blob/dev/conf/frps_legacy_full.ini) on github.
         '';
         example = literalExpression ''
           {
diff --git a/nixos/modules/services/networking/knot.nix b/nixos/modules/services/networking/knot.nix
index e97195d8291..d98c0ce25bf 100644
--- a/nixos/modules/services/networking/knot.nix
+++ b/nixos/modules/services/networking/knot.nix
@@ -5,10 +5,110 @@ with lib;
 let
   cfg = config.services.knot;
 
-  configFile = pkgs.writeTextFile {
+  yamlConfig = let
+    result = assert secsCheck; nix2yaml cfg.settings;
+
+    secAllow = n: hasPrefix "mod-" n || elem n [
+      "module"
+      "server" "xdp" "control"
+      "log"
+      "statistics" "database"
+      "keystore" "key" "remote" "remotes" "acl" "submission" "policy"
+      "template"
+      "zone"
+      "include"
+    ];
+    secsCheck = let
+      secsBad = filter (n: !secAllow n) (attrNames cfg.settings);
+    in if secsBad == [] then true else throw
+      ("services.knot.settings contains unknown sections: " + toString secsBad);
+
+    nix2yaml = nix_def: concatStrings (
+        # We output the config section in the upstream-mandated order.
+        # Ordering is important due to forward-references not being allowed.
+        # See definition of conf_export and 'const yp_item_t conf_schema'
+        # upstream for reference.  Last updated for 3.3.
+        # When changing the set of sections, also update secAllow above.
+        [ (sec_list_fa "id" nix_def "module") ]
+        ++ map (sec_plain nix_def)
+          [ "server" "xdp" "control" ]
+        ++ [ (sec_list_fa "target" nix_def "log") ]
+        ++ map (sec_plain nix_def)
+          [  "statistics" "database" ]
+        ++ map (sec_list_fa "id" nix_def)
+          [ "keystore" "key" "remote" "remotes" "acl" "submission" "policy" ]
+
+        # Export module sections before the template section.
+        ++ map (sec_list_fa "id" nix_def) (filter (hasPrefix "mod-") (attrNames nix_def))
+
+        ++ [ (sec_list_fa "id" nix_def "template") ]
+        ++ [ (sec_list_fa "domain" nix_def "zone") ]
+        ++ [ (sec_plain nix_def "include") ]
+      );
+
+    # A plain section contains directly attributes (we don't really check that ATM).
+    sec_plain = nix_def: sec_name: if !hasAttr sec_name nix_def then "" else
+      n2y "" { ${sec_name} = nix_def.${sec_name}; };
+
+    # This section contains a list of attribute sets.  In each of the sets
+    # there's an attribute (`fa_name`, typically "id") that must exist and come first.
+    # Alternatively we support using attribute sets instead of lists; example diff:
+    # -template = [ { id = "default"; /* other attributes */ }   { id = "foo"; } ]
+    # +template = { default = {       /* those attributes */ };  foo = { };      }
+    sec_list_fa = fa_name: nix_def: sec_name: if !hasAttr sec_name nix_def then "" else
+      let
+        elem2yaml = fa_val: other_attrs:
+          "  - " + n2y "" { ${fa_name} = fa_val; }
+          + "    " + n2y "    " other_attrs
+          + "\n";
+        sec = nix_def.${sec_name};
+      in
+        sec_name + ":\n" +
+          (if isList sec
+            then flip concatMapStrings sec
+              (elem: elem2yaml elem.${fa_name} (removeAttrs elem [ fa_name ]))
+            else concatStrings (mapAttrsToList elem2yaml sec)
+          );
+
+    # This convertor doesn't care about ordering of attributes.
+    # TODO: it could probably be simplified even more, now that it's not
+    # to be used directly, but we might want some other tweaks, too.
+    n2y = indent: val:
+      if doRecurse val then concatStringsSep "\n${indent}"
+        (mapAttrsToList
+          # This is a bit wacky - set directly under a set would start on bad indent,
+          # so we start those on a new line, but not other types of attribute values.
+          (aname: aval: "${aname}:${if doRecurse aval then "\n${indent}  " else " "}"
+            + n2y (indent + "  ") aval)
+          val
+        )
+        + "\n"
+        else
+      /*
+      if isList val && stringLength indent < 4 then concatMapStrings
+        (elem: "\n${indent}- " + n2y (indent + "  ") elem)
+        val
+        else
+      */
+      if isList val /* and long indent */ then
+        "[ " + concatMapStringsSep ", " quoteString val + " ]" else
+      if isBool val then (if val then "on" else "off") else
+      quoteString val;
+
+    # We don't want paths like ./my-zone.txt be converted to plain strings.
+    quoteString = s: ''"${if builtins.typeOf s == "path" then s else toString s}"'';
+    # We don't want to walk the insides of derivation attributes.
+    doRecurse = val: isAttrs val && !isDerivation val;
+
+  in result;
+
+  configFile = if cfg.settingsFile != null then
+    assert cfg.settings == {} && cfg.keyFiles == [];
+    cfg.settingsFile
+  else pkgs.writeTextFile {
     name = "knot.conf";
-    text = (concatMapStringsSep "\n" (file: "include: ${file}") cfg.keyFiles) + "\n" +
-           cfg.extraConfig;
+    text = (concatMapStringsSep "\n" (file: "include: ${file}") cfg.keyFiles) + "\n" + yamlConfig;
+    # TODO: maybe we could do some checks even when private keys complicate this?
     checkPhase = lib.optionalString (cfg.keyFiles == []) ''
       ${cfg.package}/bin/knotc --config=$out conf-check
     '';
@@ -60,11 +160,21 @@ in {
         '';
       };
 
-      extraConfig = mkOption {
-        type = types.lines;
-        default = "";
+      settings = mkOption {
+        type = types.attrs;
+        default = {};
         description = lib.mdDoc ''
-          Extra lines to be added verbatim to knot.conf
+          Extra configuration as nix values.
+        '';
+      };
+
+      settingsFile = mkOption {
+        type = types.nullOr types.path;
+        default = null;
+        description = lib.mdDoc ''
+          As alternative to ``settings``, you can provide whole configuration
+          directly in the almost-YAML format of Knot DNS.
+          You might want to utilize ``writeTextFile`` for this.
         '';
       };
 
@@ -78,6 +188,12 @@ in {
       };
     };
   };
+  imports = [
+    # Compatibility with NixOS 23.05.  At least partial, as it fails assert if used with keyFiles.
+    (mkChangedOptionModule [ "services" "knot" "extraConfig" ] [ "services" "knot" "settingsFile" ]
+      (config: pkgs.writeText "knot.conf" config.services.knot.extraConfig)
+    )
+  ];
 
   config = mkIf config.services.knot.enable {
     users.groups.knot = {};
@@ -87,6 +203,8 @@ in {
       description = "Knot daemon user";
     };
 
+    environment.etc."knot/knot.conf".source = configFile; # just for user's convenience
+
     systemd.services.knot = {
       unitConfig.Documentation = "man:knotd(8) man:knot.conf(5) man:knotc(8) https://www.knot-dns.cz/docs/${cfg.package.version}/html/";
       description = cfg.package.meta.description;
diff --git a/nixos/modules/services/networking/mtr-exporter.nix b/nixos/modules/services/networking/mtr-exporter.nix
index 43ebbbe96d0..af694c3e736 100644
--- a/nixos/modules/services/networking/mtr-exporter.nix
+++ b/nixos/modules/services/networking/mtr-exporter.nix
@@ -2,63 +2,114 @@
 
 let
   inherit (lib)
-    maintainers types mkEnableOption mkOption mkIf
-    literalExpression escapeShellArg escapeShellArgs;
+    maintainers types literalExpression
+    escapeShellArg escapeShellArgs
+    mkEnableOption mkOption mkRemovedOptionModule mkIf mdDoc
+    optionalString concatMapStrings concatStringsSep;
+
   cfg = config.services.mtr-exporter;
+
+  jobsConfig = pkgs.writeText "mtr-exporter.conf" (concatMapStrings (job: ''
+    ${job.name} -- ${job.schedule} -- ${concatStringsSep " " job.flags} ${job.address}
+  '') cfg.jobs);
 in {
+  imports = [
+    (mkRemovedOptionModule [ "services" "mtr-exporter" "target" ] "Use services.mtr-exporter.jobs instead.")
+    (mkRemovedOptionModule [ "services" "mtr-exporter" "mtrFlags" ] "Use services.mtr-exporter.jobs.<job>.flags instead.")
+  ];
+
   options = {
     services = {
       mtr-exporter = {
-        enable = mkEnableOption (lib.mdDoc "a Prometheus exporter for MTR");
+        enable = mkEnableOption (mdDoc "a Prometheus exporter for MTR");
 
-        target = mkOption {
+        address = mkOption {
           type = types.str;
-          example = "example.org";
-          description = lib.mdDoc "Target to check using MTR.";
-        };
-
-        interval = mkOption {
-          type = types.int;
-          default = 60;
-          description = lib.mdDoc "Interval between MTR checks in seconds.";
+          default = "127.0.0.1";
+          description = lib.mdDoc "Listen address for MTR exporter.";
         };
 
         port = mkOption {
           type = types.port;
           default = 8080;
-          description = lib.mdDoc "Listen port for MTR exporter.";
+          description = mdDoc "Listen port for MTR exporter.";
         };
 
-        address = mkOption {
-          type = types.str;
-          default = "127.0.0.1";
-          description = lib.mdDoc "Listen address for MTR exporter.";
+        extraFlags = mkOption {
+          type = types.listOf types.str;
+          default = [];
+          example = ["-flag.deprecatedMetrics"];
+          description = mdDoc ''
+            Extra command line options to pass to MTR exporter.
+          '';
         };
 
-        mtrFlags = mkOption {
-          type = with types; listOf str;
-          default = [];
-          example = ["-G1"];
-          description = lib.mdDoc "Additional flags to pass to MTR.";
+        package = mkOption {
+          type = types.package;
+          default = pkgs.mtr-exporter;
+          defaultText = literalExpression "pkgs.mtr-exporter";
+          description = mdDoc "The MTR exporter package to use.";
+        };
+
+        mtrPackage = mkOption {
+          type = types.package;
+          default = pkgs.mtr;
+          defaultText = literalExpression "pkgs.mtr";
+          description = mdDoc "The MTR package to use.";
+        };
+
+        jobs = mkOption {
+          description = mdDoc "List of MTR jobs. Will be added to /etc/mtr-exporter.conf";
+          type = types.nonEmptyListOf (types.submodule {
+            options = {
+              name = mkOption {
+                type = types.str;
+                description = mdDoc "Name of ICMP pinging job.";
+              };
+
+              address = mkOption {
+                type = types.str;
+                example = "host.example.org:1234";
+                description = mdDoc "Target address for MTR client.";
+              };
+
+              schedule = mkOption {
+                type = types.str;
+                default = "@every 60s";
+                example = "@hourly";
+                description = mdDoc "Schedule of MTR checks. Also accepts Cron format.";
+              };
+
+              flags = mkOption {
+                type = with types; listOf str;
+                default = [];
+                example = ["-G1"];
+                description = mdDoc "Additional flags to pass to MTR.";
+              };
+            };
+          });
         };
       };
     };
   };
 
   config = mkIf cfg.enable {
+    environment.etc."mtr-exporter.conf" = {
+      source = jobsConfig;
+    };
+
     systemd.services.mtr-exporter = {
-      script = ''
-        exec ${pkgs.mtr-exporter}/bin/mtr-exporter \
-          -mtr ${pkgs.mtr}/bin/mtr \
-          -schedule '@every ${toString cfg.interval}s' \
-          -bind ${escapeShellArg cfg.address}:${toString cfg.port} \
-          -- \
-          ${escapeShellArgs (cfg.mtrFlags ++ [ cfg.target ])}
-      '';
       wantedBy = [ "multi-user.target" ];
       requires = [ "network.target" ];
       after = [ "network.target" ];
       serviceConfig = {
+        ExecStart = ''
+          ${cfg.package}/bin/mtr-exporter \
+            -mtr '${cfg.mtrPackage}/bin/mtr' \
+            -bind ${escapeShellArg "${cfg.address}:${toString cfg.port}"} \
+            -jobs '${jobsConfig}' \
+            ${escapeShellArgs cfg.extraFlags}
+        '';
         Restart = "on-failure";
         # Hardening
         CapabilityBoundingSet = [ "" ];
diff --git a/nixos/modules/services/networking/networkmanager.nix b/nixos/modules/services/networking/networkmanager.nix
index 6bc46a9a90e..53c847ee3ca 100644
--- a/nixos/modules/services/networking/networkmanager.nix
+++ b/nixos/modules/services/networking/networkmanager.nix
@@ -30,13 +30,11 @@ let
   configFile = pkgs.writeText "NetworkManager.conf" (lib.concatStringsSep "\n" [
     (mkSection "main" {
       plugins = "keyfile";
-      dhcp = cfg.dhcp;
-      dns = cfg.dns;
+      inherit (cfg) dhcp dns;
       # If resolvconf is disabled that means that resolv.conf is managed by some other module.
       rc-manager =
         if config.networking.resolvconf.enable then "resolvconf"
         else "unmanaged";
-      firewall-backend = cfg.firewallBackend;
     })
     (mkSection "keyfile" {
       unmanaged-devices =
@@ -233,15 +231,6 @@ in
         '';
       };
 
-      firewallBackend = mkOption {
-        type = types.enum [ "iptables" "nftables" "none" ];
-        default = "iptables";
-        description = lib.mdDoc ''
-          Which firewall backend should be used for configuring masquerading with shared mode.
-          If set to none, NetworkManager doesn't manage the configuration at all.
-        '';
-      };
-
       logLevel = mkOption {
         type = types.enum [ "OFF" "ERR" "WARN" "INFO" "DEBUG" "TRACE" ];
         default = "WARN";
@@ -340,20 +329,20 @@ in
         default = [ ];
         example = literalExpression ''
           [ {
-                source = pkgs.writeText "upHook" '''
-
-                  if [ "$2" != "up" ]; then
-                      logger "exit: event $2 != up"
-                      exit
-                  fi
-
-                  # coreutils and iproute are in PATH too
-                  logger "Device $DEVICE_IFACE coming up"
-              ''';
-              type = "basic";
-          } ]'';
+            source = pkgs.writeText "upHook" '''
+              if [ "$2" != "up" ]; then
+                logger "exit: event $2 != up"
+                exit
+              fi
+
+              # coreutils and iproute are in PATH too
+              logger "Device $DEVICE_IFACE coming up"
+            ''';
+            type = "basic";
+          } ]
+        '';
         description = lib.mdDoc ''
-          A list of scripts which will be executed in response to  network  events.
+          A list of scripts which will be executed in response to network events.
         '';
       };
 
@@ -413,6 +402,9 @@ in
       them via the DNS server in your network, or use environment.etc
       to add a file into /etc/NetworkManager/dnsmasq.d reconfiguring hostsdir.
     '')
+    (mkRemovedOptionModule [ "networking" "networkmanager" "firewallBackend" ] ''
+      This option was removed as NixOS is now using iptables-nftables-compat even when using iptables, therefore Networkmanager now uses the nftables backend unconditionally.
+    '')
   ];
 
 
diff --git a/nixos/modules/services/networking/nftables.nix b/nixos/modules/services/networking/nftables.nix
index 47159ade328..a0afdb45275 100644
--- a/nixos/modules/services/networking/nftables.nix
+++ b/nixos/modules/services/networking/nftables.nix
@@ -248,7 +248,6 @@ in
   config = mkIf cfg.enable {
     boot.blacklistedKernelModules = [ "ip_tables" ];
     environment.systemPackages = [ pkgs.nftables ];
-    networking.networkmanager.firewallBackend = mkDefault "nftables";
     # versionOlder for backportability, remove afterwards
     networking.nftables.flushRuleset = mkDefault (versionOlder config.system.stateVersion "23.11" || (cfg.rulesetFile != null || cfg.ruleset != ""));
     systemd.services.nftables = {
diff --git a/nixos/modules/services/networking/ssh/sshd.nix b/nixos/modules/services/networking/ssh/sshd.nix
index 702423ef09c..bf2f5230c73 100644
--- a/nixos/modules/services/networking/ssh/sshd.nix
+++ b/nixos/modules/services/networking/ssh/sshd.nix
@@ -27,13 +27,11 @@ let
       mkValueString = mkValueStringSshd;
     } " ";});
 
-  configFile = settingsFormat.generate "config" cfg.settings;
-  sshconf = pkgs.runCommand "sshd.conf-validated" { nativeBuildInputs = [ validationPackage ]; } ''
+  configFile = settingsFormat.generate "sshd.conf-settings" cfg.settings;
+  sshconf = pkgs.runCommand "sshd.conf-final" { } ''
     cat ${configFile} - >$out <<EOL
     ${cfg.extraConfig}
     EOL
-
-    sshd -G -f $out
   '';
 
   cfg  = config.services.openssh;
@@ -576,6 +574,21 @@ in
         '')}
       '';
 
+    system.checks = [
+      (pkgs.runCommand "check-sshd-config"
+        {
+          nativeBuildInputs = [ validationPackage ];
+        } ''
+        ${concatMapStringsSep "\n"
+          (lport: "sshd -G -T -C lport=${toString lport} -f ${sshconf} > /dev/null")
+          cfg.ports}
+        ${concatMapStringsSep "\n"
+          (la: "sshd -G -T -C laddr=${la.addr},lport=${toString la.port} -f ${sshconf} > /dev/null")
+          cfg.listenAddresses}
+        touch $out
+      '')
+    ];
+
     assertions = [{ assertion = if cfg.settings.X11Forwarding then cfgc.setXAuthLocation else true;
                     message = "cannot enable X11 forwarding without setting xauth location";}
                   (let
diff --git a/nixos/modules/services/networking/wg-quick.nix b/nixos/modules/services/networking/wg-quick.nix
index 34210580f53..68e0e06d046 100644
--- a/nixos/modules/services/networking/wg-quick.nix
+++ b/nixos/modules/services/networking/wg-quick.nix
@@ -17,6 +17,8 @@ let
         type = with types; nullOr str;
         description = lib.mdDoc ''
           wg-quick .conf file, describing the interface.
+          Using this option can be a useful means of configuring WireGuard if
+          one has an existing .conf file.
           This overrides any other configuration interface configuration options.
           See wg-quick manpage for more details.
         '';
diff --git a/nixos/modules/services/search/typesense.nix b/nixos/modules/services/search/typesense.nix
index 856c3cad22d..c158d04fea2 100644
--- a/nixos/modules/services/search/typesense.nix
+++ b/nixos/modules/services/search/typesense.nix
@@ -83,12 +83,12 @@ in {
         Group = "typesense";
 
         StateDirectory = "typesense";
-        StateDirectoryMode = "0700";
+        StateDirectoryMode = "0750";
 
         # Hardening
         CapabilityBoundingSet = "";
         LockPersonality = true;
-        MemoryDenyWriteExecute = true;
+        # MemoryDenyWriteExecute = true; needed since 0.25.1
         NoNewPrivileges = true;
         PrivateUsers = true;
         PrivateTmp = true;
diff --git a/nixos/modules/services/security/vaultwarden/default.nix b/nixos/modules/services/security/vaultwarden/default.nix
index d22e6b5b40c..0517615a4c6 100644
--- a/nixos/modules/services/security/vaultwarden/default.nix
+++ b/nixos/modules/services/security/vaultwarden/default.nix
@@ -60,10 +60,8 @@ in {
     config = mkOption {
       type = attrsOf (nullOr (oneOf [ bool int str ]));
       default = {
-        config = {
-          ROCKET_ADDRESS = "::1"; # default to localhost
-          ROCKET_PORT = 8222;
-        };
+        ROCKET_ADDRESS = "::1"; # default to localhost
+        ROCKET_PORT = 8222;
       };
       example = literalExpression ''
         {
diff --git a/nixos/modules/services/web-apps/calibre-web.nix b/nixos/modules/services/web-apps/calibre-web.nix
index 143decfc091..80567db10c9 100644
--- a/nixos/modules/services/web-apps/calibre-web.nix
+++ b/nixos/modules/services/web-apps/calibre-web.nix
@@ -10,6 +10,8 @@ in
     services.calibre-web = {
       enable = mkEnableOption (lib.mdDoc "Calibre-Web");
 
+      package = lib.mkPackageOption pkgs "calibre-web" { };
+
       listen = {
         ip = mkOption {
           type = types.str;
@@ -73,6 +75,8 @@ in
           '';
         };
 
+        enableKepubify = mkEnableOption (lib.mdDoc "kebup conversion support");
+
         enableBookUploading = mkOption {
           type = types.bool;
           default = false;
@@ -106,7 +110,7 @@ in
     systemd.services.calibre-web = let
       appDb = "/var/lib/${cfg.dataDir}/app.db";
       gdriveDb = "/var/lib/${cfg.dataDir}/gdrive.db";
-      calibreWebCmd = "${pkgs.calibre-web}/bin/calibre-web -p ${appDb} -g ${gdriveDb}";
+      calibreWebCmd = "${cfg.package}/bin/calibre-web -p ${appDb} -g ${gdriveDb}";
 
       settings = concatStringsSep ", " (
         [
@@ -117,6 +121,7 @@ in
         ]
         ++ optional (cfg.options.calibreLibrary != null) "config_calibre_dir = '${cfg.options.calibreLibrary}'"
         ++ optional cfg.options.enableBookConversion "config_converterpath = '${pkgs.calibre}/bin/ebook-convert'"
+        ++ optional cfg.options.enableKepubify "config_kepubifypath = '${pkgs.kepubify}/bin/kepubify'"
       );
     in
       {
diff --git a/nixos/modules/services/web-apps/plausible.nix b/nixos/modules/services/web-apps/plausible.nix
index 4b308d2ee56..e2d5cdc4f7c 100644
--- a/nixos/modules/services/web-apps/plausible.nix
+++ b/nixos/modules/services/web-apps/plausible.nix
@@ -248,11 +248,10 @@ in {
             # setup
             ${cfg.package}/createdb.sh
             ${cfg.package}/migrate.sh
+            export IP_GEOLOCATION_DB=${pkgs.dbip-country-lite}/share/dbip/dbip-country-lite.mmdb
             ${cfg.package}/bin/plausible eval "(Plausible.Release.prepare() ; Plausible.Auth.create_user(\"$ADMIN_USER_NAME\", \"$ADMIN_USER_EMAIL\", \"$ADMIN_USER_PWD\"))"
             ${optionalString cfg.adminUser.activate ''
-              if ! ${cfg.package}/init-admin.sh | grep 'already exists'; then
-                psql -d plausible <<< "UPDATE users SET email_verified=true;"
-              fi
+              psql -d plausible <<< "UPDATE users SET email_verified=true where email = '$ADMIN_USER_EMAIL';"
             ''}
 
             exec plausible start
diff --git a/nixos/modules/services/web-apps/vikunja.nix b/nixos/modules/services/web-apps/vikunja.nix
index 8bc8e8c2925..6b1d4da532b 100644
--- a/nixos/modules/services/web-apps/vikunja.nix
+++ b/nixos/modules/services/web-apps/vikunja.nix
@@ -147,5 +147,9 @@ in {
     };
 
     environment.etc."vikunja/config.yaml".source = configFile;
+
+    environment.systemPackages = [
+      cfg.package-api # for admin `vikunja` CLI
+    ];
   };
 }
diff --git a/nixos/modules/services/web-servers/garage.nix b/nixos/modules/services/web-servers/garage.nix
index 8b5734b5a2c..80fb24fe2c5 100644
--- a/nixos/modules/services/web-servers/garage.nix
+++ b/nixos/modules/services/web-servers/garage.nix
@@ -23,6 +23,12 @@ in
       example = { RUST_BACKTRACE="yes"; };
     };
 
+    environmentFile = mkOption {
+      type = types.nullOr types.path;
+      description = lib.mdDoc "File containing environment variables to be passed to the Garage server.";
+      default = null;
+    };
+
     logLevel = mkOption {
       type = types.enum (["info" "debug" "trace"]);
       default = "info";
@@ -80,7 +86,7 @@ in
       after = [ "network.target" "network-online.target" ];
       wants = [ "network.target" "network-online.target" ];
       wantedBy = [ "multi-user.target" ];
-      restartTriggers = [ configFile ];
+      restartTriggers = [ configFile ] ++ (lib.optional (cfg.environmentFile != null) cfg.environmentFile);
       serviceConfig = {
         ExecStart = "${cfg.package}/bin/garage server";
 
@@ -88,6 +94,7 @@ in
         DynamicUser = lib.mkDefault true;
         ProtectHome = true;
         NoNewPrivileges = true;
+        EnvironmentFile = lib.optional (cfg.environmentFile != null) cfg.environmentFile;
       };
       environment = {
         RUST_LOG = lib.mkDefault "garage=${cfg.logLevel}";
diff --git a/nixos/modules/services/x11/desktop-managers/plasma5.nix b/nixos/modules/services/x11/desktop-managers/plasma5.nix
index 15a510fd8f9..282a34f6b01 100644
--- a/nixos/modules/services/x11/desktop-managers/plasma5.nix
+++ b/nixos/modules/services/x11/desktop-managers/plasma5.nix
@@ -172,24 +172,19 @@ in
     (mkIf (cfg.enable || cfg.mobile.enable || cfg.bigscreen.enable) {
 
       security.wrappers = {
-        kscreenlocker_greet = {
-          setuid = true;
+        kwin_wayland = {
           owner = "root";
           group = "root";
-          source = "${getBin libsForQt5.kscreenlocker}/libexec/kscreenlocker_greet";
+          capabilities = "cap_sys_nice+ep";
+          source = "${getBin plasma5.kwin}/bin/kwin_wayland";
         };
+      } // mkIf (!cfg.runUsingSystemd) {
         start_kdeinit = {
           setuid = true;
           owner = "root";
           group = "root";
           source = "${getBin libsForQt5.kinit}/libexec/kf5/start_kdeinit";
         };
-        kwin_wayland = {
-          owner = "root";
-          group = "root";
-          capabilities = "cap_sys_nice+ep";
-          source = "${getBin plasma5.kwin}/bin/kwin_wayland";
-        };
       };
 
       environment.systemPackages =
diff --git a/nixos/modules/services/x11/display-managers/gdm.nix b/nixos/modules/services/x11/display-managers/gdm.nix
index e6923bcbb56..400e5601dc5 100644
--- a/nixos/modules/services/x11/display-managers/gdm.nix
+++ b/nixos/modules/services/x11/display-managers/gdm.nix
@@ -97,6 +97,19 @@ in
         type = types.bool;
       };
 
+      banner = mkOption {
+        type = types.nullOr types.lines;
+        default = null;
+        example = ''
+          foo
+          bar
+          baz
+        '';
+        description = lib.mdDoc ''
+          Optional message to display on the login screen.
+        '';
+      };
+
       settings = mkOption {
         type = settingsFormat.type;
         default = { };
@@ -238,6 +251,11 @@ in
         sleep-inactive-ac-timeout = lib.gvariant.mkInt32 0;
         sleep-inactive-battery-timeout = lib.gvariant.mkInt32 0;
       };
+    }] ++ lib.optionals (cfg.gdm.banner != null) [{
+      settings."org/gnome/login-screen" = {
+        banner-message-enable = true;
+        banner-message-text = cfg.gdm.banner;
+      };
     }] ++ [ "${gdm}/share/gdm/greeter-dconf-defaults" ];
 
     # Use AutomaticLogin if delay is zero, because it's immediate.
diff --git a/nixos/modules/system/activation/switch-to-configuration.pl b/nixos/modules/system/activation/switch-to-configuration.pl
index 8bd450d7343..e05f89bb0fb 100755
--- a/nixos/modules/system/activation/switch-to-configuration.pl
+++ b/nixos/modules/system/activation/switch-to-configuration.pl
@@ -74,7 +74,7 @@ if ("@localeArchive@" ne "") {
 
 if (!defined($action) || ($action ne "switch" && $action ne "boot" && $action ne "test" && $action ne "dry-activate")) {
     print STDERR <<"EOF";
-Usage: $0 [switch|boot|test]
+Usage: $0 [switch|boot|test|dry-activate]
 
 switch:       make the configuration the boot default and activate now
 boot:         make the configuration the boot default
@@ -661,10 +661,20 @@ foreach my $mount_point (keys(%{$cur_fss})) {
         # Filesystem entry disappeared, so unmount it.
         $units_to_stop{$unit} = 1;
     } elsif ($cur->{fsType} ne $new->{fsType} || $cur->{device} ne $new->{device}) {
-        # Filesystem type or device changed, so unmount and mount it.
-        $units_to_stop{$unit} = 1;
-        $units_to_start{$unit} = 1;
-        record_unit($start_list_file, $unit);
+        if ($mount_point eq '/' or $mount_point eq '/nix') {
+            if ($cur->{options} ne $new->{options}) {
+                # Mount options changed, so remount it.
+                $units_to_reload{$unit} = 1;
+                record_unit($reload_list_file, $unit);
+            } else {
+                # Don't unmount / or /nix if the device changed
+                $units_to_skip{$unit} = 1;
+            }
+        } else {
+            # Filesystem type or device changed, so unmount and mount it.
+            $units_to_restart{$unit} = 1;
+            record_unit($restart_list_file, $unit);
+        }
     } elsif ($cur->{options} ne $new->{options}) {
         # Mount options changes, so remount it.
         $units_to_reload{$unit} = 1;
diff --git a/nixos/modules/tasks/network-interfaces-systemd.nix b/nixos/modules/tasks/network-interfaces-systemd.nix
index dfa883a2c33..679567cbb73 100644
--- a/nixos/modules/tasks/network-interfaces-systemd.nix
+++ b/nixos/modules/tasks/network-interfaces-systemd.nix
@@ -173,6 +173,33 @@ let
     }];
   }));
 
+  bridgeNetworks = mkMerge (flip mapAttrsToList cfg.bridges (name: bridge: {
+    netdevs."40-${name}" = {
+      netdevConfig = {
+        Name = name;
+        Kind = "bridge";
+      };
+    };
+    networks = listToAttrs (forEach bridge.interfaces (bi:
+      nameValuePair "40-${bi}" (mkMerge [ (genericNetwork (mkOverride 999)) {
+        DHCP = mkOverride 0 (dhcpStr false);
+        networkConfig.Bridge = name;
+      } ])));
+  }));
+
+  vlanNetworks = mkMerge (flip mapAttrsToList cfg.vlans (name: vlan: {
+    netdevs."40-${name}" = {
+      netdevConfig = {
+        Name = name;
+        Kind = "vlan";
+      };
+      vlanConfig.Id = vlan.id;
+    };
+    networks."40-${vlan.interface}" = (mkMerge [ (genericNetwork (mkOverride 999)) {
+      vlan = [ name ];
+    } ]);
+  }));
+
 in
 
 {
@@ -182,7 +209,15 @@ in
     # Note this is if initrd.network.enable, not if
     # initrd.systemd.network.enable. By setting the latter and not the
     # former, the user retains full control over the configuration.
-    boot.initrd.systemd.network = mkMerge [(genericDhcpNetworks true) interfaceNetworks];
+    boot.initrd.systemd.network = mkMerge [
+      (genericDhcpNetworks true)
+      interfaceNetworks
+      bridgeNetworks
+      vlanNetworks
+    ];
+    boot.initrd.availableKernelModules =
+      optional (cfg.bridges != {}) "bridge" ++
+      optional (cfg.vlans != {}) "8021q";
   })
 
   (mkIf cfg.useNetworkd {
@@ -212,19 +247,7 @@ in
       }
       (genericDhcpNetworks false)
       interfaceNetworks
-      (mkMerge (flip mapAttrsToList cfg.bridges (name: bridge: {
-        netdevs."40-${name}" = {
-          netdevConfig = {
-            Name = name;
-            Kind = "bridge";
-          };
-        };
-        networks = listToAttrs (forEach bridge.interfaces (bi:
-          nameValuePair "40-${bi}" (mkMerge [ (genericNetwork (mkOverride 999)) {
-            DHCP = mkOverride 0 (dhcpStr false);
-            networkConfig.Bridge = name;
-          } ])));
-      })))
+      bridgeNetworks
       (mkMerge (flip mapAttrsToList cfg.bonds (name: bond: {
         netdevs."40-${name}" = {
           netdevConfig = {
@@ -377,18 +400,7 @@ in
           } ]);
         };
       })))
-      (mkMerge (flip mapAttrsToList cfg.vlans (name: vlan: {
-        netdevs."40-${name}" = {
-          netdevConfig = {
-            Name = name;
-            Kind = "vlan";
-          };
-          vlanConfig.Id = vlan.id;
-        };
-        networks."40-${vlan.interface}" = (mkMerge [ (genericNetwork (mkOverride 999)) {
-          vlan = [ name ];
-        } ]);
-      })))
+      vlanNetworks
     ];
 
     # We need to prefill the slaved devices with networking options
diff --git a/nixos/modules/virtualisation/google-compute-config.nix b/nixos/modules/virtualisation/google-compute-config.nix
index cf94ce0faf3..3c503f027d7 100644
--- a/nixos/modules/virtualisation/google-compute-config.nix
+++ b/nixos/modules/virtualisation/google-compute-config.nix
@@ -39,7 +39,7 @@ in
   # Allow root logins only using SSH keys
   # and disable password authentication in general
   services.openssh.enable = true;
-  services.openssh.settings.PermitRootLogin = "prohibit-password";
+  services.openssh.settings.PermitRootLogin = mkDefault "prohibit-password";
   services.openssh.settings.PasswordAuthentication = mkDefault false;
 
   # enable OS Login. This also requires setting enable-oslogin=TRUE metadata on
diff --git a/nixos/modules/virtualisation/oci-common.nix b/nixos/modules/virtualisation/oci-common.nix
new file mode 100644
index 00000000000..ac9405e3ecf
--- /dev/null
+++ b/nixos/modules/virtualisation/oci-common.nix
@@ -0,0 +1,60 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.oci;
+in
+{
+  imports = [ ../profiles/qemu-guest.nix ];
+
+  # Taken from /proc/cmdline of Ubuntu 20.04.2 LTS on OCI
+  boot.kernelParams = [
+    "nvme.shutdown_timeout=10"
+    "nvme_core.shutdown_timeout=10"
+    "libiscsi.debug_libiscsi_eh=1"
+    "crash_kexec_post_notifiers"
+
+    # VNC console
+    "console=tty1"
+
+    # x86_64-linux
+    "console=ttyS0"
+
+    # aarch64-linux
+    "console=ttyAMA0,115200"
+  ];
+
+  boot.growPartition = true;
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-label/nixos";
+    fsType = "ext4";
+    autoResize = true;
+  };
+
+  fileSystems."/boot" = lib.mkIf cfg.efi {
+    device = "/dev/disk/by-label/ESP";
+    fsType = "vfat";
+  };
+
+  boot.loader.efi.canTouchEfiVariables = false;
+  boot.loader.grub = {
+    device = if cfg.efi then "nodev" else "/dev/sda";
+    splashImage = null;
+    extraConfig = ''
+      serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+      terminal_input --append serial
+      terminal_output --append serial
+    '';
+    efiInstallAsRemovable = cfg.efi;
+    efiSupport = cfg.efi;
+  };
+
+  # https://docs.oracle.com/en-us/iaas/Content/Compute/Tasks/configuringntpservice.htm#Configuring_the_Oracle_Cloud_Infrastructure_NTP_Service_for_an_Instance
+  networking.timeServers = [ "169.254.169.254" ];
+
+  services.openssh.enable = true;
+
+  # Otherwise the instance may not have a working network-online.target,
+  # making the fetch-ssh-keys.service fail
+  networking.useNetworkd = true;
+}
diff --git a/nixos/modules/virtualisation/oci-config-user.nix b/nixos/modules/virtualisation/oci-config-user.nix
new file mode 100644
index 00000000000..70c0b34efe7
--- /dev/null
+++ b/nixos/modules/virtualisation/oci-config-user.nix
@@ -0,0 +1,12 @@
+{ modulesPath, ... }:
+
+{
+  # To build the configuration or use nix-env, you need to run
+  # either nixos-rebuild --upgrade or nix-channel --update
+  # to fetch the nixos channel.
+
+  # This configures everything but bootstrap services,
+  # which only need to be run once and have already finished
+  # if you are able to see this comment.
+  imports = [ "${modulesPath}/virtualisation/oci-common.nix" ];
+}
diff --git a/nixos/modules/virtualisation/oci-image.nix b/nixos/modules/virtualisation/oci-image.nix
new file mode 100644
index 00000000000..d4af5016dd7
--- /dev/null
+++ b/nixos/modules/virtualisation/oci-image.nix
@@ -0,0 +1,50 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.oci;
+in
+{
+  imports = [ ./oci-common.nix ];
+
+  config = {
+    system.build.OCIImage = import ../../lib/make-disk-image.nix {
+      inherit config lib pkgs;
+      name = "oci-image";
+      configFile = ./oci-config-user.nix;
+      format = "qcow2";
+      diskSize = 8192;
+      partitionTableType = if cfg.efi then "efi" else "legacy";
+    };
+
+    systemd.services.fetch-ssh-keys = {
+      description = "Fetch authorized_keys for root user";
+
+      wantedBy = [ "sshd.service" ];
+      before = [ "sshd.service" ];
+
+      after = [ "network-online.target" ];
+      wants = [ "network-online.target" ];
+
+      path  = [ pkgs.coreutils pkgs.curl ];
+      script = ''
+        mkdir -m 0700 -p /root/.ssh
+        if [ -f /root/.ssh/authorized_keys ]; then
+          echo "Authorized keys have already been downloaded"
+        else
+          echo "Downloading authorized keys from Instance Metadata Service v2"
+          curl -s -S -L \
+            -H "Authorization: Bearer Oracle" \
+            -o /root/.ssh/authorized_keys \
+            http://169.254.169.254/opc/v2/instance/metadata/ssh_authorized_keys
+          chmod 600 /root/.ssh/authorized_keys
+        fi
+      '';
+      serviceConfig = {
+        Type = "oneshot";
+        RemainAfterExit = true;
+        StandardError = "journal+console";
+        StandardOutput = "journal+console";
+      };
+    };
+  };
+}
diff --git a/nixos/modules/virtualisation/oci-options.nix b/nixos/modules/virtualisation/oci-options.nix
new file mode 100644
index 00000000000..0dfedc6a530
--- /dev/null
+++ b/nixos/modules/virtualisation/oci-options.nix
@@ -0,0 +1,14 @@
+{ config, lib, pkgs, ... }:
+{
+  options = {
+    oci = {
+      efi = lib.mkOption {
+        default = true;
+        internal = true;
+        description = ''
+          Whether the OCI instance is using EFI.
+        '';
+      };
+    };
+  };
+}