Add missing command step ssh check-host.

command/ssh/checkHost.go

@@ -0,0 +1,65 @@
+package ssh
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/smallstep/cli/command"
+	"github.com/smallstep/cli/errs"
+	"github.com/smallstep/cli/flags"
+	"github.com/smallstep/cli/utils/cautils"
+	"github.com/urfave/cli"
+)
+
+func checkHostCommand() cli.Command {
+	return cli.Command{
+		Name:      "check-host",
+		Action:    command.ActionFunc(checkHostAction),
+		Usage:     "checks if a certificate has been issued for a host",
+		UsageText: `**step ssh check-host** <hostname>`,
+		Description: `**step ssh check-host** checks if a certificate has been issued for a host.
+
+This command returns a zero exit status then the server exists, it will return 1
+otherwise.
+
+## POSITIONAL ARGUMENTS
+
+<hostname>
+:  The hostname of the server to check.
+
+## EXAMPLES
+
+Check that internal.example.com exists:
+'''
+$ step ssh check-host internal.smallstep.com
+'''`,
+		Flags: []cli.Flag{
+			flags.CaURL,
+			flags.Root,
+			flags.Offline,
+			flags.CaConfig,
+		},
+	}
+}
+
+func checkHostAction(ctx *cli.Context) error {
+	if err := errs.NumberOfArguments(ctx, 1); err != nil {
+		return err
+	}
+
+	client, err := cautils.NewClient(ctx)
+	if err != nil {
+		return err
+	}
+
+	resp, err := client.SSHCheckHost(ctx.Args().First())
+	if err != nil {
+		return err
+	}
+
+	fmt.Println(resp.Exists)
+	if !resp.Exists {
+		os.Exit(1)
+	}
+	return nil
+}