Gadgets as OCI artifacts
Intro TODO
Specifications
The Open Container Initiative defines the Image Format Specification . This specification was initially defined for container images but it is extended to store other artifacts, see Guidance for Artifacts Authors .
Architectures
Inspektor Gadget supports multi architecture artifacts. The following architectures are supported:
- amd64
- arm64
Gadget metadata
Media type: application/vnd.gadget.config.v1+yaml
The content has the type GadgetMetadata struct . It is a work in progress.
Image layers and media types
Each architecture can contain several layers, but each layer must have a different media type among the following:
application/vnd.gadget.ebpf.program.v1+binaryapplication/vnd.gadget.wasm.program.v1+binary
The ebpf layer
There must be exactly one layer with the ebpf media type. It must not be empty. Its content must be a valid ELF file.
The wasm layer
There must be at most one layer with the wasm media type. If present, it must not be empty and it must be a valid wasm file.
Image annotations
OCI images can have annotations at different levels:
- index
- manifest
- config
- layer
Inspektor Gadget automatically adds the following annotations at the manifest and config levels:
org.opencontainers.image.*: defined by OCI Image Format- title
- description
- url
- documentation
- source
- created