Workaround for missing vendor libraries, when migrating D8 sites with aegir

workaround_missing_vendor_libraries_d8_aegir_migration.sh

#!/bin/bash
## Aegir has major problems while migrating sites, when the new platform doesn't have the vendor libraries available.
## Here is a workaround for solving that problem.

## Copy the working site into the new platform.
## That needs to be done, to let composer_manager know about all the site package requirements
cp -r /var/aegir/platforms/old_platform/sites/site.name.org /var/aegir/platforms/new_platform/sites/site.name.org.migration
cd /var/aegir/platforms/new_platform

## Initialize composer_manager if not already done
php modules/contrib/composer_manager/scripts/init.php

## Perform composer drupal-update to rebuild composer.json and download all required vendor libraries.
composer drupal-update

## Remove the tempoary copied site, because it's not needed anymore.
rm -r /var/aegir/platforms/new_platform/sites/site.name.org.migration

## Start the normal aegir migratio from UI.