we have webrunners where some files don't belong to correct user in partitions. In this case, find fails and we get this error:

Traceback (most recent call last):
  File "/opt/slapgrid/01ce71861bb9c5883cdbdf8af74c5d1f/bin/runner-exporter", line 83, in <module>
    sys.exit(slapos.resilient.runner_exporter.runExport())
  File "/opt/slapgrid/01ce71861bb9c5883cdbdf8af74c5d1f/eggs/slapos.toolbox-0.100-py2.7.egg/slapos/resilient/runner_exporter.py", line 182, in runExport
    modified_file_list = getBackupFilesModifiedDuringExportList(args, export_start_date)
  File "/opt/slapgrid/01ce71861bb9c5883cdbdf8af74c5d1f/eggs/slapos.toolbox-0.100-py2.7.egg/slapos/resilient/runner_exporter.py", line 106, in getBackupFilesModifiedDuringExportList
    'find', 'instance', '-cmin',  str(export_time / 60), '-type', 'f', '-path', '*/srv/backup/*'
  File "/opt/slapgrid/01ce71861bb9c5883cdbdf8af74c5d1f/parts/python2.7/lib/python2.7/subprocess.py", line 223, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '('find', 'instance', '-cmin', '0.335502366225', '-type', 'f', '-path', '*/srv/backup/*')' returned non-zero exit status 1

Make find don't go into directories with wrong permissions