lotus/cli/chain.go

package cli

import (
	"fmt"

	"gopkg.in/urfave/cli.v2"
)

var chainCmd = &cli.Command{
	Name:  "chain",
	Usage: "Interact with filecoin blockchain",
	Subcommands: []*cli.Command{
		chainHeadCmd,
	},
}

var chainHeadCmd = &cli.Command{
	Name:  "head",
	Usage: "Print chain head",
	Action: func(cctx *cli.Context) error {
		api, err := getAPI(cctx)
		if err != nil {
			return err
		}
		ctx := reqContext(cctx)

		head, err := api.ChainHead(ctx)
		if err != nil {
			return err
		}

		for _, c := range head {
			fmt.Println(c)
		}
		return nil
	},
}