Chaincode package

From version 2.0, Hyperledger Fabric chaincode packages are .tgz files which contain two files:

• metadata.json — the chaincode label and type
• code.tar.gz — source artifacts for the chaincode

Chaincode packages are used by the peer lifecycle chaincode command as part of the Fabric chaincode lifecycle to deploy chaincode. For example,

peer lifecycle chaincode install go-contract.tgz

For more information, see the Fabric chaincode lifecycle documentation.

metadata.json

The k8s builder will detect chaincode packages which have a type of k8s. For example,

{
    "type": "k8s",
    "label": "go-contract"
}

The k8s builder uses the chaincode label to label Kubernetes objects, so it must be a valid Kubernetes label value.

code.tar.gz

Unlike other chaincode packages, the source artifacts in a k8s chaincode package do not contain the chaincode source files. Instead, the code.tar.gz file contains an image.json file which defines which chaincode image should be used.

The code.tar.gz file can also contain CouchDB indexes. For more information, see the CouchDB indexes Fabric documentation.

image.json

The chaincode image must be built and published before creating the image.json file. The image.json contains the chaincode image name, and the immutable digest of the published image. For more information, see Pull an image by digest (immutable identifier). For example.

{
  "name": "ghcr.io/hyperledger-labs/go-contract",
  "digest": "sha256:802c336235cc1e7347e2da36c73fa2e4b6437cfc6f52872674d1e23f23bba63b"
}