def restore_datafile(datafile, noRemove=False):
"""
Restore a file that has been migrated
"""
# (Deferred imports to avoid prematurely triggering DB init)
from tardis.tardis_portal.models import Dataset_File
from django.db import transaction
with transaction.commit_on_success():
df = Dataset_File.objects.select_for_update().get(id=datafile.id)
if df.is_local():
return False
destination = Destination.identify_destination(df.url)
if not destination:
raise MigrationError('Cannot identify the migration destination' \
' holding %s' % df.url)
if not df.verified or destination.trust_length:
raise MigrationError('Only verified datafiles can be restored' \
' from destination %s' % destination.name)
df.verified = False
url = df.url
if not stage_file(df):
raise MigrationError('Restoration failed')
logger.info('Restored file %s for datafile %s' %
(df.get_absolute_filepath(), df.id))
if not noRemove:
destination.provider.remove_file(url)
logger.info('Removed remote file %s for datafile %s' % (url, df.id))
return True
