Merge pull request #11869 from ts468/avahi

nixos avahi-daemon: add new option declarations

nixos/modules/services/networking/avahi-daemon.nix

@@ -1,5 +1,5 @@
 # Avahi daemon.
-{ config, lib, pkgs, ... }:
+{ config, lib, utils, pkgs, ... }:
 
 with lib;
 
@@ -7,7 +7,9 @@ let
 
   cfg = config.services.avahi;
 
-  inherit (pkgs) avahi;
+  # We must escape interfaces due to the systemd interpretation
+  subsystemDevice = interface:
+    "sys-subsystem-net-devices-${utils.escapeSystemdPath interface}.device";
 
   avahiDaemonConf = with cfg; pkgs.writeText "avahi-daemon.conf" ''
     [server]
@@ -21,12 +23,18 @@ let
     browse-domains=${concatStringsSep ", " browseDomains}
     use-ipv4=${if ipv4 then "yes" else "no"}
     use-ipv6=${if ipv6 then "yes" else "no"}
+    ${optionalString (interfaces!=null) "allow-interfaces=${concatStringsSep "," interfaces}"}
 
     [wide-area]
     enable-wide-area=${if wideArea then "yes" else "no"}
 
     [publish]
-    disable-publishing=${if publishing then "no" else "yes"}
+    disable-publishing=${if publish.enable then "no" else "yes"}
+    disable-user-service-publishing=${if publish.userServices then "no" else "yes"}
+    publish-addresses=${if publish.userServices || publish.addresses then "yes" else "no"}
+    publish-hinfo=${if publish.hinfo then "yes" else "no"}
+    publish-workstation=${if publish.workstation then "yes" else "no"}
+    publish-domain=${if publish.domain then "yes" else "no"}
   '';
 
 in
@@ -74,14 +82,55 @@ in
         description = ''Whether to use IPv6'';
       };
 
+      interfaces = mkOption {
+        type = types.nullOr (types.listOf types.str);
+        default = null;
+        description = ''
+          List of network interfaces that should be used by the <command>avahi-daemon</command>.
+          Other interfaces will be ignored. If <literal>null</literal> all local interfaces
+          except loopback and point-to-point will be used.
+        '';
+      };
+
       wideArea = mkOption {
         default = true;
         description = ''Whether to enable wide-area service discovery.'';
       };
 
-      publishing = mkOption {
-        default = true;
-        description = ''Whether to allow publishing.'';
+      publish = {
+        enable = mkOption {
+          default = false;
+          description = ''Whether to allow publishing in general.'';
+        };
+
+        userServices = mkOption {
+          default = false;
+          description = ''Whether to publish user services. Will set <literal>addresses=true</literal>.'';
+        };
+
+        addresses = mkOption {
+          default = false;
+          description = ''Whether to register mDNS address records for all local IP addresses.'';
+        };
+
+        hinfo = mkOption {
+          default = false;
+          description = ''
+            Whether to register an mDNS HINFO record which contains information about the
+            local operating system and CPU.
+          '';
+        };
+
+        workstation = mkOption {
+          default = false;
+          description = ''Whether to register a service of type "_workstation._tcp" on the local LAN.'';
+        };
+
+        domain = mkOption {
+          default = false;
+          description = ''Whether to announce the locally used domain name for browsing by other hosts.'';
+        };
+
       };
 
       nssmdns = mkOption {
@@ -118,29 +167,36 @@ in
 
     system.nssModules = optional cfg.nssmdns pkgs.nssmdns;
 
-    environment.systemPackages = [ avahi ];
+    environment.systemPackages = [ pkgs.avahi ];
 
-    jobs.avahi_daemon =
-      { name = "avahi-daemon";
+    systemd.services.avahi-daemon =
+      let
+        deps = optionals (cfg.interfaces!=null) (map subsystemDevice cfg.interfaces);
+      in
+      { description = "Avahi daemon";
+        wantedBy = [ "ip-up.target" ];
+        bindsTo = deps;
+        after = deps;
+        before = [ "ip-up.target" ];
+        # Receive restart event after resume
+        partOf = [ "post-resume.target" ];
 
-        startOn = "ip-up";
+        path = [ pkgs.coreutils pkgs.avahi ];
+
+        preStart = "mkdir -p /var/run/avahi-daemon";
 
         script =
           ''
-            export PATH="${avahi}/bin:${avahi}/sbin:$PATH"
-
             # Make NSS modules visible so that `avahi_nss_support ()' can
             # return a sensible value.
             export LD_LIBRARY_PATH="${config.system.nssModules.path}"
 
-            mkdir -p /var/run/avahi-daemon
-
-            exec ${avahi}/sbin/avahi-daemon --syslog -f "${avahiDaemonConf}"
+            exec ${pkgs.avahi}/sbin/avahi-daemon --syslog -f "${avahiDaemonConf}"
           '';
       };
 
     services.dbus.enable = true;
-    services.dbus.packages = [avahi];
+    services.dbus.packages = [ pkgs.avahi ];
 
     # Enabling Avahi without exposing it in the firewall doesn't make
     # sense.

nixos/modules/services/printing/cupsd.nix

@@ -247,6 +247,8 @@ in
 
         wantedBy = [ "multi-user.target" ];
         wants = [ "cups.service" "avahi-daemon.service" ];
+        bindsTo = [ "cups.service" "avahi-daemon.service" ];
+        partOf = [ "cups.service" "avahi-daemon.service" ];
         after = [ "cups.service" "avahi-daemon.service" ];
 
         path = [ cups ];