Image cache manager.
The cache manager implements the specification at http://wiki.openstack.org/nova-image-cache-management.
Bases: object
Verify that base images are in a reasonable state.
Construct a filename for storing additional information about a base image.
Returns a filename.
Test if a given path matches the pattern for info files.
Read the checksum.
Returns the checksum (as hex) or None.
Read information about an image.
Returns an empty dictionary if there is no info, just the field value if a field is requested, or the entire dictionary otherwise.
Write a checksum to disk for a file in _base.
Write information about an image.