cmd/lncli: add version command that reads verrpc.GetVersion

cmd/lncli/cmd_version.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/lightningnetwork/lnd/build"
+	"github.com/lightningnetwork/lnd/lnrpc/lnclipb"
+	"github.com/lightningnetwork/lnd/lnrpc/verrpc"
+	"github.com/urfave/cli"
+)
+
+var versionCommand = cli.Command{
+	Name:  "version",
+	Usage: "Display lncli and lnd version info.",
+	Description: `
+	Returns version information about both lncli and lnd. If lncli is unable
+	to connect to lnd, the command fails but still prints the lncli version.
+	`,
+	Action: actionDecorator(version),
+}
+
+func version(ctx *cli.Context) error {
+	conn := getClientConn(ctx, false)
+	defer conn.Close()
+
+	versions := &lnclipb.VersionResponse{
+		Lncli: &verrpc.Version{
+			Commit:        build.Commit,
+			CommitHash:    build.CommitHash,
+			Version:       build.Version(),
+			AppMajor:      uint32(build.AppMajor),
+			AppMinor:      uint32(build.AppMinor),
+			AppPatch:      uint32(build.AppPatch),
+			AppPreRelease: build.AppPreRelease,
+			BuildTags:     build.Tags(),
+			GoVersion:     build.GoVersion,
+		},
+	}
+
+	client := verrpc.NewVersionerClient(conn)
+
+	ctxb := context.Background()
+	lndVersion, err := client.GetVersion(ctxb, &verrpc.VersionRequest{})
+	if err != nil {
+		printRespJSON(versions)
+		return fmt.Errorf("unable fetch version from lnd: %v", err)
+	}
+	versions.Lnd = lndVersion
+
+	printRespJSON(versions)
+
+	return nil
+}