code: def create_source(srcdir, preload_image, datapusher=False):
      
      try:
          docker.web_command(
              command='/bin/cp -a /project/ckan /project_target/ckan',
              rw={srcdir: '/project_target'},
              image=preload_image)
          if datapusher:
              docker.web_command(
                  command='/bin/cp -a /project/datapusher /project_target/datapusher',
                  rw={srcdir: '/project_target'},
                  image=preload_image)
          shutil.copy(
              srcdir + '/ckan/ckan/config/who.ini',
              srcdir)
          shutil.copy(
              srcdir + '/ckan/ckan/config/solr/schema.xml',
              srcdir)
      finally:
          # fix srcdir permissions
          docker.web_command(
              command='/bin/chown -R --reference=/project /project',
              rw={srcdir: '/project'},
              )
docs: Copy ckan source, datapusher source (optional), who.ini and schema.xml
      from preload image into srcdir