From https://gitlab.com/hamrant/migrate_tools/-/merge_requests/1

sync_option_for_migrate_tools_from_UI.patch

From b1a51b15c6a1ccd924553d23505a45e95bf29666 Mon Sep 17 00:00:00 2001
From: Igor Karpilenko <karpylenko.ihor@gmail.com>
Date: Mon, 26 Oct 2020 20:34:17 +0200
Subject: [PATCH 1/4] Backport from 5.x branch

---
 src/MigrateBatchExecutable.php | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/MigrateBatchExecutable.php b/src/MigrateBatchExecutable.php
index 03e1b40..fa1ed52 100644
--- a/src/MigrateBatchExecutable.php
+++ b/src/MigrateBatchExecutable.php
@@ -30,6 +30,13 @@ class MigrateBatchExecutable extends MigrateExecutable {
    */
   protected $checkDependencies = 0;
 
+  /**
+   * Indicates if synchronization is needed.
+   *
+   * @var bool
+   */
+  protected $syncSource = FALSE;
+
   /**
    * The current batch context.
    *
@@ -57,7 +64,13 @@ class MigrateBatchExecutable extends MigrateExecutable {
       $this->checkDependencies = $options['force'];
     }
 
+    if (isset($options['sync'])) {
+      $this->syncSource = $options['sync'];
+    }
+
     parent::__construct($migration, $message, $options);
+
+
     $this->migrationPluginManager = \Drupal::getContainer()->get('plugin.manager.migration');
   }
 
@@ -92,6 +105,7 @@ class MigrateBatchExecutable extends MigrateExecutable {
       'limit' => $this->itemLimit,
       'update' => $this->updateExistingRows,
       'force' => $this->checkDependencies,
+      'sync' => $this->syncSource,
     ]);
 
     if (count($operations) > 0) {
@@ -141,6 +155,7 @@ class MigrateBatchExecutable extends MigrateExecutable {
             'limit' => 0,
             'update' => $options['update'],
             'force' => $options['force'],
+            'sync' => $options['sync'],
           ]));
         }
       }
@@ -177,7 +192,8 @@ class MigrateBatchExecutable extends MigrateExecutable {
     // Prepare the migration executable.
     $message = new MigrateMessage();
     /** @var \Drupal\migrate\Plugin\MigrationInterface $migration */
-    $migration = \Drupal::getContainer()->get('plugin.manager.migration')->createInstance($migration_id);
+    $migration = \Drupal::getContainer()->get('plugin.manager.migration')->createInstance($migration_id, isset($options['configuration']) ? $options['configuration'] : []);
+    unset($options['configuration']);
 
     // Each batch run we need to reinitialize the counter for the migration.
     if (!empty($options['limit']) && isset($context['results'][$migration->id()]['@numitems'])) {
-- 
GitLab


From a8042e2efbda149a17462c37b200577163974fc3 Mon Sep 17 00:00:00 2001
From: Igor Karpilenko <karpylenko.ihor@gmail.com>
Date: Mon, 26 Oct 2020 20:35:09 +0200
Subject: [PATCH 2/4] Add sync option to migrate execute form

---
 src/Form/MigrationExecuteForm.php | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/Form/MigrationExecuteForm.php b/src/Form/MigrationExecuteForm.php
index 150f7d1..4aeffad 100644
--- a/src/Form/MigrationExecuteForm.php
+++ b/src/Form/MigrationExecuteForm.php
@@ -142,6 +142,12 @@ class MigrationExecuteForm extends FormBase {
       '#description' => $this->t('Check this box to update all previously-imported content in addition to importing new content. Leave unchecked to only import new content'),
     ];
 
+    $form['options']['sync'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Sync'),
+      '#description' => $this->t('Check this box to sync (delete missed in source) all previously-imported content in addition to importing new content. Leave unchecked to only import new content'),
+    ];
+
     $form['options']['force'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Ignore dependencies'),
@@ -184,6 +190,12 @@ class MigrationExecuteForm extends FormBase {
     else {
       $force = 0;
     }
+    if ($form_state->getValue('sync')) {
+      $sync = $form_state->getValue('sync');
+    }
+    else {
+      $sync = 0;
+    }
 
     $migration = $this->getRouteMatch()->getParameter('migration');
     if ($migration) {
@@ -198,6 +210,7 @@ class MigrationExecuteForm extends FormBase {
             'limit' => $limit,
             'update' => $update,
             'force' => $force,
+            'sync' => $sync,
           ];
 
           $executable = new MigrateBatchExecutable($migration_plugin, $migrateMessage, $options);
-- 
GitLab


From c3463cd38d8684bb8abf85917334775c0104a96b Mon Sep 17 00:00:00 2001
From: Igor Karpilenko <karpylenko.ihor@gmail.com>
Date: Mon, 26 Oct 2020 20:36:09 +0200
Subject: [PATCH 3/4] Fix for MigrationImportSync that was executed during each
 batch process

---
 src/MigrateBatchExecutable.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/MigrateBatchExecutable.php b/src/MigrateBatchExecutable.php
index fa1ed52..2010443 100644
--- a/src/MigrateBatchExecutable.php
+++ b/src/MigrateBatchExecutable.php
@@ -191,6 +191,10 @@ class MigrateBatchExecutable extends MigrateExecutable {
 
     // Prepare the migration executable.
     $message = new MigrateMessage();
+    if ($context['sandbox']['counter'] > 0) {
+      // We need to run MigrationImportSync only once.
+      $options['sync'] = 0;
+    }
     /** @var \Drupal\migrate\Plugin\MigrationInterface $migration */
     $migration = \Drupal::getContainer()->get('plugin.manager.migration')->createInstance($migration_id, isset($options['configuration']) ? $options['configuration'] : []);
     unset($options['configuration']);
-- 
GitLab


From 054d8629f51925d074ce680e25e02c4e36052aeb Mon Sep 17 00:00:00 2001
From: Igor Karpilenko <karpylenko.ihor@gmail.com>
Date: Tue, 27 Oct 2020 18:39:45 +0200
Subject: [PATCH 4/4] Pass syncSource option to migration instance

---
 src/MigrateBatchExecutable.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/MigrateBatchExecutable.php b/src/MigrateBatchExecutable.php
index 2010443..790737e 100644
--- a/src/MigrateBatchExecutable.php
+++ b/src/MigrateBatchExecutable.php
@@ -191,9 +191,9 @@ class MigrateBatchExecutable extends MigrateExecutable {
 
     // Prepare the migration executable.
     $message = new MigrateMessage();
-    if ($context['sandbox']['counter'] > 0) {
+    if ($options['sync'] && $context['sandbox']['counter'] == 0) {
       // We need to run MigrationImportSync only once.
-      $options['sync'] = 0;
+      $options['configuration']['syncSource'] = TRUE;
     }
     /** @var \Drupal\migrate\Plugin\MigrationInterface $migration */
     $migration = \Drupal::getContainer()->get('plugin.manager.migration')->createInstance($migration_id, isset($options['configuration']) ? $options['configuration'] : []);
-- 
GitLab