Migrating files from a URL (http://domain.com/path/to/file.jpg) to a URI (sites/all/default/files/path/to/file.jpg)

When using the following I get tons of 'The specified file %file could not be copied to %destination' kind of errors

$this->addFieldMapping('field_profile_photo', 'picture');
    $this->addFieldMapping('source_dir')
    ->defaultValue('http://www.domain.com');

When just simply mapping, as follows, the same problem applies:

$this->addFieldMapping('field_profile_photo', 'picture');

Not sure what you mean by mapping 'directly'. Care to elaborate?

Tnx!

Thanks a lot, that does work now. However, now I stumble on a related problem: although the error messages are gone, it seems the mapping has not taken place. When I edit the respective node, the image is not loaded in the profile photo field. However, they are copied to my sites/default/files/../.. directory

Here's relevant code:

    $this->addFieldMapping('field_profile_photo', 'picture');
    $this->addFieldMapping('field_profile_photo:source_dir')
         ->defaultValue('http://www.domain.com');

And here's my full class

class ProfileMigration extends Migration {
  public function __construct() {
    parent::__construct();
    // The example uses a SQL database as source.
    $query = db_select(SOURCE_DATABASE .'.users', 'p')
      ->fields('p', array('uid', 'name', 'pass', 'mail', 'created', 'access', 'login', 'status', 'init', 'language', 'timezone', 'picture'))
      ->condition('p.name', array('admin'), 'NOT IN')
      ->condition('p.status', 1, '=')
      ->condition('p.uid', 1, '>')
      ->orderBy('p.uid', 'ASC');

    $this->source = new MigrateSourceSQL($query);

    $this->dependencies = array('User');

    $this->destination = new MigrateDestinationNode('profile');

    $this->map = new MigrateSQLMap($this->machineName,
      array(
        'uid' => array(
          'type' => 'int',
          'unsigned' => TRUE,
          'not null' => TRUE,
          'alias' => 'p',
        )
      ),
      MigrateDestinationNode::getKeySchema()
    );

    $this->addFieldMapping('is_new')->defaultValue(true);
    $this->addFieldMapping('path')->issueGroup(t('DNM'));
    $this->addFieldMapping('language', 'language')->defaultValue('ku');
    $this->addFieldMapping('title', 'name');
    $this->addFieldMapping('nid', 'uid');
    $this->addFieldMapping('field_profile_email', 'mail');
    $this->addFieldMapping('uid')->defaultValue(1);
    $this->addFieldMapping('field_profile_user', 'uid')
         ->defaultValue(0)
         ->sourceMigration('User');

    $this->addFieldMapping('field_profile_photo', 'picture');
    $this->addFieldMapping('field_profile_photo:source_dir')
         ->defaultValue('http://www.domain.com');

    // Finally we add simple field mappings
    $this->addSimpleMappings(array('created', 'status'));

    // Unmapped source fields
    $this->addUnmigratedSources(array('pass', 'access', 'login', 'init', 'timezone'));

    // Unmapped destination fields
    $this->addUnmigratedDestinations(array('pathauto', 'changed', 'promote', 'sticky', 'revision', 'log', 'tnid', 'revision_uid', 'comment', 'field_profile_address', 'body', 'field_profile_photo:title', 'field_profile_photo:alt', 'field_profile_photo:preserve_files', 'field_profile_photo:file_replace', 'field_profile_photo:destination_file', 'field_profile_photo:destination_dir', 'field_profile_photo:language', 'field_profile_photo:file_class', 'field_profile_phone:language', 'field_profile_phone:format', 'field_profile_phone', 'field_profile_organization:language', 'field_profile_organization:format', 'field_profile_organization', 'field_profile_last_name:language', 'field_profile_last_name:format', 'field_profile_first_name:language', 'field_profile_first_name:format', 'field_profile_email:language', 'field_profile_email:format', 'field_profile_address:language', 'field_profile_address:format', 'body:language', 'body:format', 'body:summary', 'field_twitter:language', 'field_twitter:format', 'field_twitter', 'field_profile_job_title:language', 'field_profile_job_title:format', 'field_profile_job_title', 'field_facebook_url', 'field_profile_first_name', 'field_profile_last_name'));
  }
}

Works now! tnx