1 files changed, 15 insertions, 0 deletions
diff --git a/apps/dav/lib/UserMigration/CalendarMigrator.php b/apps/dav/lib/UserMigration/CalendarMigrator.php
index 015ce6faa86..e6383bcc1dd 100644
--- a/apps/dav/lib/UserMigration/CalendarMigrator.php
+++ b/apps/dav/lib/UserMigration/CalendarMigrator.php
@@ -209,6 +209,21 @@ class CalendarMigrator implements IMigrator {
 	/**
 	 * {@inheritDoc}
 	 */
+	public function getExportEstimatedSize(IUser $user): int {
+		$principalUri = $this->getPrincipalUri($user);
+
+		return array_sum(array_map(
+			function (ICalendar $calendar) use ($user): int {
+				// FIXME 1MiB by calendar, no idea if this is accurate and if we should go into more details
+				return 1000;
+			},
+			$this->calendarManager->getCalendarsForPrincipal($principalUri),
+		));
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
 	public function export(IUser $user, IExportDestination $exportDestination, OutputInterface $output): void {
 		$output->writeln('Exporting calendars into ' . CalendarMigrator::EXPORT_ROOT . '…');