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service.nix (1748B)

      1 {
      2   liminix,
      3   svc,
      4   hostapd,
      5   output-template,
      6   writeText,
      7   lib,
      8 }:
      9 { interface, params }:
     10 let
     11   inherit (liminix.services) longrun;
     12   inherit (lib) concatStringsSep mapAttrsToList unique;
     13   inherit (builtins)
     14     map
     15     filter
     16     attrValues
     17     length
     18     head
     19     typeOf
     20     ;
     21 
     22   # This is not a friendly interface to configuring a wireless AP: it
     23   # just passes everything straight through to the hostapd config.
     24   # When we've worked out what the sensible options are to expose,
     25   # we'll add them as top-level attributes and rename params to
     26   # extraParams
     27 
     28   name = "${interface.name}.hostapd";
     29   defaults = {
     30     driver = "nl80211";
     31     logger_syslog = "-1";
     32     logger_syslog_level = 1;
     33     ctrl_interface = "/run/${name}";
     34     ctrl_interface_group = 0;
     35   };
     36   attrs = defaults // params;
     37   literal_or_output =
     38     o:
     39     (
     40       {
     41         string = builtins.toJSON;
     42         int = builtins.toJSON;
     43         lambda = (o: "output(${builtins.toJSON (o "service")}, ${builtins.toJSON (o "path")})");
     44       }
     45       .${builtins.typeOf o}
     46     )
     47       o;
     48 
     49   conf = (
     50     writeText "hostapd.conf.in" (
     51       (concatStringsSep "\n" (mapAttrsToList (n: v: "${n}={{ ${literal_or_output v} }}") attrs)) + "\n"
     52     )
     53   );
     54   service = longrun {
     55     inherit name;
     56     dependencies = [ interface ];
     57     run = ''
     58       mkdir -p /run/${name}
     59       chmod 0700 /run/${name}
     60       ${output-template}/bin/output-template '{{' '}}' < ${conf} > /run/${name}/hostapd.conf
     61       exec ${hostapd}/bin/hostapd -i $(output ${interface} ifname) -P /run/${name}/hostapd.pid -S /run/${name}/hostapd.conf
     62     '';
     63   };
     64   watch = filter (f: typeOf f == "lambda") (attrValues attrs);
     65 in
     66 svc.secrets.subscriber.build {
     67   inherit service watch;
     68   action = "restart-all";
     69 }