Abstract out utils.simple-timer and use it.

chileh-backups.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
-let two-days = 60 * 60 * 24 * 2 - 60; in
+let two-days = 60 * 60 * 24 * 2 - 60;
+    utils = import ./utils.nix;
+in
 {
   config = lib.mkIf config.host.chileh-backups.enable {
     services.periodimail.intervals = [ two-days ];
@@ -20,14 +22,7 @@ let two-days = 60 * 60 * 24 * 2 - 60; in
       };
     };
 
-    systemd.timers.backup-deretheni = {
-      description = "Backup deretheni daily";
-      wantedBy = [ "timers.target" ];
-      timerConfig = {
-        OnCalendar = "daily";
-        Persistent = true;
-      };
-    };
+    systemd.timers.backup-deretheni = utils.simple-timer "daily" "Backup deretheni daily";
 
     systemd.services.snapshot-chileh-edanaher = {
       description = "Snapshot chileh homedir";
@@ -39,14 +34,7 @@ let two-days = 60 * 60 * 24 * 2 - 60; in
       };
     };
 
-    systemd.timers.snapshot-chileh-edanaher = {
-      description = "Snapshot chileh homedir hourly";
-      wantedBy = [ "timers.target" ];
-      timerConfig = {
-        OnCalendar = "hourly";
-        Persistent = true;
-      };
-    };
+    systemd.timers.snapshot-chileh-edanaher = utils.simple-timer "hourly" "Snapshot chileh homedir hourly";
 
     systemd.services.snapshot-chileh-edanaher-to-borg = {
       description = "Copy chileh homedir snapshots to borg";
@@ -57,14 +45,7 @@ let two-days = 60 * 60 * 24 * 2 - 60; in
       };
     };
 
-    systemd.timers.snapshot-chileh-edanaher-to-borg = {
-      description = "Copy chileh homedir snapshots to borg daily";
-      wantedBy = [ "timers.target" ];
-      timerConfig = {
-        OnCalendar = "daily";
-        Persistent = true;
-      };
-    };
+    systemd.timers.snapshot-chileh-edanaher-to-borg = utils.simple-timer "daily" "Copy chileh homedir snapshots to borg daily";
   };
 
   options = {

host/hosts.nix

@@ -33,14 +33,7 @@ let
         };
       };
 
-      systemd.timers.check-edanaher-mail = {
-        description = "Check mail for edanaher every half hour";
-        wantedBy = [ "timers.target" ];
-        timerConfig = {
-          OnCalendar = "*-*-* *:00,30:00";
-          Persistent = true;
-        };
-      };
+      systemd.timers.check-edanaher-mail = utils.simple-timer "*-*-* *:00,30:00" "Check mail for edanaher every half hour";
 
       host.monitor-disks = {
         "/" = 90;

host/utils.nix

@@ -1,6 +1,7 @@
 { lib }:
 
-{
+let parent = import ../utils.nix; in
+parent // {
   select = v: set: let all = lib.mapAttrs (name: data: lib.mkIf (name == v) data) set;
                    in lib.mkMerge (builtins.attrValues all);
 }

services/angell-classes.nix

@@ -8,6 +8,7 @@ let angell-path = "/var/run/angell-classes";
       ${update-script} > ${angell-path}/index.html.tmp
       mv ${angell-path}/index.html.tmp ${angell-path}/index.html
     '';
+    utils = import ../utils.nix;
 in
 {
   config = lib.mkIf config.host.angell-classes.enable {
@@ -33,14 +34,7 @@ in
       };
     };
 
-    systemd.timers.update-angell-classes= {
-      description = "Scrape updates for Angell classes daily";
-      wantedBy = [ "timers.target" ];
-      timerConfig = {
-        OnCalendar = "daily";
-        Persistent = true;
-      };
-    };
+    systemd.timers.update-angell-classes = utils.simple-timer "daily" "Scrape updates for Angell classes daily";
   };
   options = {
     host.angell-classes.enable = lib.mkOption {

services/disk-mon.nix

@@ -1,6 +1,7 @@
 {config, lib, pkgs, ...}:
 
 let
+  utils = import ../utils.nix;
   escapeSlash = builtins.replaceStrings [ "/" ] [ "_" ];
   mon-script-template = builtins.readFile ./disk-mon.sh;
   mon-script-text = disk: usage: builtins.replaceStrings [ "$DISK" "$USAGE" ] [ disk usage ] mon-script-template;
@@ -17,14 +18,7 @@ let
       };
     };
 
-  mon-timer-for = disk: usage: {
-    description = "Monitor usage for ${disk} at ${toString usage} daily";
-    wantedBy = [ "timers.target" ];
-    timerConfig = {
-      OnCalendar = "daily";
-      Persistent = true;
-    };
-  };
+  mon-timer-for = disk: usage: utils.simple-timer "daily" "Monitor usage for ${disk} at ${toString usage} daily";
 
   services = lib.mapAttrs' (disk: usage: lib.nameValuePair ("monitor-disk-" + escapeSlash disk) (mon-service-for disk usage)) config.host.monitor-disks;
   timers = lib.mapAttrs' (disk: usage: lib.nameValuePair ("monitor-disk-" + escapeSlash disk) (mon-timer-for disk usage)) config.host.monitor-disks;

utils.nix

@@ -0,0 +1,10 @@
+{
+  simple-timer = interval: description: {
+    description = description;
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = interval;
+      Persistent = true;
+    };
+  };
+}