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Resource Repository

KBS stores confidential resources through a Repository abstraction specified by a Rust trait. The Repository interface can be implemented for different storage backends like e.g. databases or local file systems.

The KBS config file defines which resource repository backend KBS will use. The default is the local file system (LocalFs).

Local File System Repository

With the local file system Repository default implementation, each resource file maps to a KBS resource URL. The file path to URL conversion scheme is defined below:

Resource File Path Resource URL
file://<$(KBS_REPOSITORY_DIR)>/<repository_name>/<type>/<tag> https://<kbs_address>/kbs/v0/resource/<repository_name>/<type>/<tag>

The KBS root file system resource path is specified in the KBS config file as well, and the default value is /opt/confidential-containers/kbs/repository.