email-backup: add configurable random delay

doc/email-backup.md

@@ -20,11 +20,12 @@ Just install the script:
 Configuration
 -------------
 
-The configuration goes to `global-config-overlay`, These are the parameters:
+The configuration goes to `global-config-overlay`, these are the parameters:
 
 * `BackupSendBinary`: whether to send binary backup
 * `BackupSendExport`: whether to send configuration export
 * `BackupPassword`: password to encrypt the backup with
+* `BackupRandomDelay`: delay up to amount of seconds when run from scheduler
 * `EmailBackupTo`: e-mail address to send to
 * `EmailBackupCc`: e-mail address(es) to send in copy
 

email-backup

@@ -11,6 +11,7 @@
 :while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
 
 :global BackupPassword;
+:global BackupRandomDelay;
 :global BackupSendBinary;
 :global BackupSendExport;
 :global Domain;
@@ -21,11 +22,11 @@
 :global CharacterReplace;
 :global DeviceInfo;
 :global LogPrintExit2;
+:global RandomDelay;
+:global ScriptFromTerminal;
 :global WaitForFile;
 :global WaitFullyConnected;
 
-$WaitFullyConnected;
-
 :if ($BackupSendBinary != true && \
      $BackupSendExport != true) do={
   $LogPrintExit2 error $0 ("Configured to send neither backup nor config export.") true;
@@ -35,6 +36,12 @@ $WaitFullyConnected;
   $LogPrintExit2 error $0 ("Configuration is missing recipient for e-mail backup.") true;
 }
 
+$WaitFullyConnected;
+
+:if ([ $ScriptFromTerminal $0 ] = false && $BackupRandomDelay > 0) do={
+  $RandomDelay $BackupRandomDelay;
+}
+
 # filename based on identity
 :local FileName [ $CharacterReplace ($Identity . "." . $Domain) "." "_" ];
 :local BackupFile "none";