A user has created a channel in Hyperledger Terminal between two organizations, Org1 and Org2. Now he wants to merge the organisational peer Org1 into the channel.

To merge the organizational peer Org1 into the channel, follow these steps:

1. Fetch the most recent configuration block of the channel:

   peer channel fetch config config_block.pb -o orderer.example.com:7050 -c $CHANNEL_NAME --tls --cafile $ORDERER_CA
   

2. Decode the configuration block to JSON and isolate the configuration:

   configtxlator proto_decode --input config_block.pb --type common.Block | jq .data.data[0].payload.data.config > config.json
   

3. Modify the configuration to add the Org1 MSP. This involves adding the Org1 MSP definition to the config.json file.

4. Encode the modified configuration back to protobuf:

   configtxlator proto_encode --input config.json --type common.Config --output config.pb
   

5. Compute the update needed to go from the original configuration to the modified configuration:

   configtxlator compute_update --channel_id $CHANNEL_NAME --original config.pb --updated modified_config.pb --output org1_update.pb
   

6. Decode this output, which is the actual channel configuration update transaction:

   configtxlator proto_decode --input org1_update.pb --type common.ConfigUpdate | jq . > org1_update.json
   

7. Add the envelope message, encode it back to protobuf format, and then sign the configuration update transaction:

   echo '{"payload":{"header":{"channel_header":{"channel_id":"'$CHANNEL_NAME'", "type":2}},"data":{"config_update":'$(cat org1_update.json)'}}}' | jq . > org1_update_in_envelope.json
   configtxlator proto_encode --input org1_update_in_envelope.json --type common.Envelope --output org1_update_in_envelope.pb
   

8. The admin of Org1 can now sign the configuration update:

   peer channel signconfigtx -f org1_update_in_envelope.pb
   

9. Finally, the admin of the channel can send the configuration update:

   peer channel update -f org1_update_in_envelope.pb -c $CHANNEL_NAME -o orderer.example.com:7050 --tls --cafile $ORDERER_CA
   

After these steps, Org1 should be added to the channel.