Add OmpSs-2 release timers and services

Send a reminder email to the STAR group to mark the release cycle dates.

m/hut/configuration.nix

@@ -17,6 +17,7 @@
     ./postgresql.nix
     ./nginx.nix
     ./p.nix
+    ./ompss2-timer.nix
     #./pxe.nix
   ];
 

m/hut/ompss2-timer.nix

@@ -0,0 +1,84 @@
+{ config, pkgs, ... }:
+{
+  systemd.timers = {
+    "ompss2-closing" = {
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        Unit = "ompss2-closing.service";
+        OnCalendar = [ "*-03-15 07:00:00" "*-09-15 07:00:00"];
+      };
+    };
+    "ompss2-freeze" = {
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        Unit = "ompss2-freeze.service";
+        OnCalendar = [ "*-04-15 07:00:00" "*-10-15 07:00:00" ];
+      };
+    };
+    "ompss2-release" = {
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        Unit = "ompss2-release.service";
+        OnCalendar = [ "*-05-15 07:00:00" "*-11-15 07:00:00" ];
+      };
+    };
+  };
+
+  systemd.services =
+  let
+    closing = pkgs.writeText "closing.txt"
+    ''
+      Subject: OmpSs-2 release enters closing period
+
+      Hi,
+
+      You have one month to merge the remaining features for the next OmpSs-2
+      release. Please, identify what needs to be merged and discuss it in the next
+      OmpSs-2 meeting.
+
+      Thanks!,
+      Jungle robot
+    '';
+    freeze = pkgs.writeText "freeze.txt"
+    ''
+      Subject: OmpSs-2 release enters freeze period
+
+      Hi,
+
+      The period to introduce new features or breaking changes is over, only bug
+      fixes are allowed now. During this time, please prepare the release notes
+      to be included in the next OmpSs-2 release.
+
+      Thanks!,
+      Jungle robot
+    '';
+    release = pkgs.writeText "release.txt"
+    ''
+      Subject: OmpSs-2 release now
+
+      Hi,
+
+      The period to introduce bug fixes is now over. Please, proceed to do the
+      OmpSs-2 release.
+
+      Thanks!,
+      Jungle robot
+    '';
+    mkServ = name: mail: {
+      "ompss2-${name}" = {
+        script = ''
+          set -eu
+          cat ${mail} | ${config.security.wrapperDir}/sendmail star@bsc.es
+        '';
+        serviceConfig = {
+          Type = "oneshot";
+          DynamicUser = true;
+          Group = "mail-robot";
+        };
+      };
+    };
+  in
+    (mkServ "closing" closing) //
+    (mkServ "freeze" freeze) //
+    (mkServ "release" release);
+}