1 files changed, 118 insertions, 0 deletions
diff --git a/tv/modules/consul.nix b/tv/modules/consul.nix
new file mode 100644
index 000000000..83a430c2f
--- /dev/null
+++ b/tv/modules/consul.nix
@@ -0,0 +1,118 @@
+{ config, lib, pkgs, ... }:
+
+# if quorum gets lost, then start any node with a config that doesn't contain bootstrap_expect
+# but -bootstrap
+# TODO consul-bootstrap HOST  that actually does is
+# TODO tools to inspect state of a cluster in outage state
+
+with import ../lib { inherit lib pkgs; };
+let
+  cfg = config.tv.consul;
+
+  out = {
+    options.tv.consul = api;
+    config = mkIf cfg.enable (mkMerge [
+      imp
+      { tv.iptables.input-retiolum-accept-new-tcp = [ "8300" "8301" ]; }
+      # TODO udp for 8301
+    ]);
+  };
+
+  api = {
+    enable = mkEnableOption "tv.consul";
+
+    dc = mkOption {
+      type = types.label;
+    };
+    hosts = mkOption {
+      type = with types; listOf host;
+    };
+    encrypt-file = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/root/src/secrets/consul-encrypt.json";
+    };
+    data-dir = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/var/lib/consul";
+    };
+    self = mkOption {
+      type = types.host;
+    };
+    server = mkOption {
+      type = types.bool;
+      default = false;
+    };
+    GOMAXPROCS = mkOption {
+      type = types.int;
+      default = cfg.self.cores;
+    };
+  };
+
+  consul-config = {
+    datacenter = cfg.dc;
+    data_dir = cfg.data-dir;
+    log_level = "INFO";
+    #node_name =
+    server = cfg.server;
+    enable_syslog = true;
+    retry_join =
+      # TODO allow consul in other nets than retiolum [maybe]
+      concatMap (host: host.nets.retiolum.addrs)
+                (filter (host: host.name != cfg.self.name) cfg.hosts);
+    leave_on_terminate = true;
+  } // optionalAttrs cfg.server {
+    bootstrap_expect = length cfg.hosts;
+    leave_on_terminate = false;
+  };
+
+  imp = {
+    environment.systemPackages = with pkgs; [
+      consul
+    ];
+
+    systemd.services.consul = {
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      path = with pkgs; [
+        consul
+      ];
+      environment = {
+        GOMAXPROCS = toString cfg.GOMAXPROCS;
+      };
+      serviceConfig = {
+        PermissionsStartOnly = "true";
+        SyslogIdentifier = "consul";
+        User = user.name;
+        PrivateTmp = "true";
+        Restart = "always";
+        ExecStartPre = pkgs.writeScript "consul-init" ''
+          #! /bin/sh
+          mkdir -p ${cfg.data-dir}
+          chown ${user.name}: ${cfg.data-dir}
+          install -o ${user.name} -m 0400 ${cfg.encrypt-file} /tmp/encrypt.json
+        '';
+        ExecStart = pkgs.writeScript "consul-service" ''
+          #! /bin/sh
+          set -euf
+          exec >/dev/null
+          exec consul agent \
+            -config-file=${toFile "consul.json" (toJSON consul-config)} \
+            -config-file=/tmp/encrypt.json
+        '';
+        #-node=${cfg.self.fqdn} \
+        #ExecStart = "${tinc}/sbin/tincd -c ${confDir} -d 0 -U ${user} -D";
+      };
+    };
+
+    users.extraUsers = singleton {
+      inherit (user) name uid;
+    };
+  };
+
+  user = {
+    name = "consul";
+    uid = 2999951406; # genid consul
+  };
+
+in
+out