Global options

Hermes accepts global options which affect all commands.

hermes v1.8.0
Informal Systems <hello@informal.systems>
Implementation of `hermes`, an IBC Relayer developed in Rust.

FLAGS:
        --config <CONFIG>    Path to configuration file
        --json               Enable JSON output

Ordering of command-line options

The global options must be specified right after the hermes command and before any sub-command. The non-global options have to be specified after the sub-command.

hermes [GLOBAL_OPTIONS] <SUBCOMMAND> [OPTIONS]

Example

To start Hermes using the configuration file at /home/my_chain.toml and enable JSON output:

hermes  --config $HOME/my_chain.toml --json start

To query all clients on a chain while enabling JSON output:

hermes  --json query clients --host-chain ibc-1

JSON output

If the --json option is supplied, all commands will output single-line JSON values instead of plain text.

Log messages will be written to stderr, while the final result will be written to stdout, and everything will be formatted as JSON. This allows processing only the final output using jq. To process all the output using jq, one can redirect stderr to stdout with hermes --json COMMAND 2>&1 | jq.

Example

hermes  --json create client --host-chain ibc-0 --reference-chain ibc-1

{"timestamp":"Apr 13 20:46:31.921","level":"INFO","fields":{"message":"Using default configuration from: '.hermes/config.toml'"},"target":"ibc_relayer_cli::commands"}
{"timestamp":"Apr 13 20:46:31.961","level":"INFO","fields":{"message":"running listener","chain.id":"ibc-1"},"target":"ibc_relayer::event::monitor"}
{"timestamp":"Apr 13 20:46:31.989","level":"INFO","fields":{"message":"running listener","chain.id":"ibc-0"},"target":"ibc_relayer::event::monitor"}
{"result":{"CreateClient":{"client_id":"07-tendermint-1","client_type":"Tendermint","consensus_height":{"revision_height":10060,"revision_number":1},"height":{"revision_height":10072,"revision_number":0}}},"status":"success"}

The first three lines are printed to stderr, while the last line with a "result" key is printed to stdout.

Example

To improve the readability, pipe all the output to jq:

hermes  --json create client --host-chain ibc-0 --reference-chain ibc-1
 2>&1 | jq

{
  "timestamp": "Apr 13 20:52:26.060",
  "level": "INFO",
  "fields": {
    "message": "Using default configuration from: '.hermes/config.toml'"
  },
  "target": "ibc_relayer_cli::commands"
}
{
  "timestamp": "Apr 13 20:52:26.082",
  "level": "INFO",
  "fields": {
    "message": "running listener",
    "chain.id": "ibc-1"
  },
  "target": "ibc_relayer::event::monitor"
}
{
  "timestamp": "Apr 13 20:52:26.088",
  "level": "INFO",
  "fields": {
    "message": "running listener",
    "chain.id": "ibc-0"
  },
  "target": "ibc_relayer::event::monitor"
}
{
  "result": {
    "CreateClient": {
      "client_id": "07-tendermint-5",
      "client_type": "Tendermint",
      "consensus_height": {
        "revision_height": 10364,
        "revision_number": 1
      },
      "height": {
        "revision_height": 10375,
        "revision_number": 0
      }
    }
  },
  "status": "success"
}

Example

To extract the identifier of the newly created client above:

hermes  --json create client --host-chain ibc-0 --reference-chain ibc-1
 | jq '.result.CreateClient.client_id'

Which should output:

"07-tendermint-2"