1 files changed, 63 insertions, 0 deletions

diff --git a/custom/unit-status-mail.nix b/custom/unit-status-mail.nix
new file mode 100644
index 00000000..54e5cb39
--- /dev/null
+++ b/custom/unit-status-mail.nix
@@ -0,0 +1,63 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.systemd.status-mail;
+
+  systemdCfg = foldr singleCfg {} cfg.onFailure;
+  singleCfg = unitName: attrs: attrs // (setAttrByPath ["systemd" "services" unitName "onFailure"] ["unit-status-mail@%n.service"]);
+in {
+  options = {
+    systemd.status-mail = {
+      onFailure = mkOption {
+        default = [];
+        type = types.listOf types.str;
+        description = ''
+          Send status mail when these units fail
+        '';
+      };
+
+      recipient = mkOption {
+        default = "root";
+        type = types.str;
+        description = ''
+          Recipient of status mails
+        '';
+      };
+    };
+  };
+
+  config = mkIf (cfg.onFailure != []) {
+    systemd.services."unit-status-mail@" = {
+      serviceConfig = {
+        Type = "oneshot";
+      };
+      scriptArgs = "%I \"Hostname: %H\" \"Machine-ID: %m\" \"Boot-ID: %b\"";
+      script = ''
+        #!${pkgs.stdenv.shell}
+        MAILTO="root"
+        MAILFROM="unit-status-mailer"
+        UNIT=$1
+
+        EXTRA=""
+        for e in "''${@:2}"; do
+          EXTRA+="$e"$'\n'
+        done
+
+        UNITSTATUS=$(systemctl status $UNIT)
+
+        ${config.security.wrapperDir}/sendmail $MAILTO <<EOF
+        From:$MAILFROM
+        To:$MAILTO
+        Subject:Status of $UNIT
+
+        Status report for unit: $UNIT
+        $EXTRA
+
+        $UNITSTATUS
+        EOF
+      '';
+    };
+  } // systemdCfg;
+}