When migrating d7_file, the source_base_path does not work in any case

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to our policies.

Now select the correct version

I did notice that the path is set in both the UI and in settings.php. It only needs to be set in one place. And the patch should not include the public path as well. So, instead of '/var/www/html/web-d7/sites/default/files' it probably should be '/var/www/html/web-d7/sites/default/files'. Can you try that and report back?

Since this functionality is tested I am changing to a support request, it can be changed back if a bug is found.

I have the exact same problem. I don't understand how to transfer files. I tried several path without success

So, instead of '/var/www/html/web-d7/sites/default/files' it probably should be '/var/www/html/web-d7/sites/default/files'.

Shouldn't be /var/www/html/web-d7 ?

I ended up by overriding \Drupal\file\Plugin\migrate\source\d7\File::initializeIterator()

That methods reads the public and private paths from variables in the source (Drupal 7) database. And these are then used to process the file migrations. And that triggered to this error:

 message = "file_copy: File '/pdf-file.pdf' does not exist"
 *Exception*string = ""
 code = {int} 0
 file = "/var/www/html/docroot/core/modules/migrate/src/MigrateExecutable.php"
 line = {int} 462
 *Exception*trace = {array[19]} 
 *Exception*previous = null
 level = {int} 1
 status = {int} 3
$id_map = {Drupal\migrate_tools\IdMapFilter} 
$msg = "d7_file_private:uri:file_copy: File '/pdf-file.pdf' does not exist"

Instead I override it with hardcoded paths. In the example below the original code in still in place for reference.

# docroot/core/modules/file/src/Plugin/migrate/source/d7/File.php
# \Drupal\file\Plugin\migrate\source\d7\File::initializeIterator
/**
 * {@inheritdoc}
 */
protected function initializeIterator() {
  $this->publicPath = $this->variableGet('file_public_path', 'sites/default/files');
  $this->privatePath = $this->variableGet('file_private_path', NULL);

  // Patch start: override public and private paths with ddev mounts inside the target container.
  $this->publicPath = '/var/www/html/drupal7_migration_mounts/public_mount';
  $this->privatePath = '/var/www/html/drupal7_migration_mounts/private_mount';
  // Patch stop: override public and private paths with ddev mounts inside the target container.

  return parent::initializeIterator();
}

Same here, I had to hack /core/modules/file/src/Plugin/migrate/source/d7/File.php for it to work.