Add Revision to version CLI output and add JSON support

Also add JSON format support

command/commands_oss.go

@@ -220,6 +220,6 @@ func init() {
 	Register("tls cert", func(ui cli.Ui) (cli.Command, error) { return tlscert.New(), nil })
 	Register("tls cert create", func(ui cli.Ui) (cli.Command, error) { return tlscertcreate.New(ui), nil })
 	Register("validate", func(ui cli.Ui) (cli.Command, error) { return validate.New(ui), nil })
-	Register("version", func(ui cli.Ui) (cli.Command, error) { return version.New(ui, verHuman), nil })
+	Register("version", func(ui cli.Ui) (cli.Command, error) { return version.New(ui), nil })
 	Register("watch", func(ui cli.Ui) (cli.Command, error) { return watch.New(ui, MakeShutdownCh()), nil })
 }

command/version/formatter.go

@@ -0,0 +1,69 @@
+package version
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+const (
+	PrettyFormat string = "pretty"
+	JSONFormat   string = "json"
+)
+
+type Formatter interface {
+	Format(info *VersionInfo) (string, error)
+}
+
+func GetSupportedFormats() []string {
+	return []string{PrettyFormat, JSONFormat}
+}
+
+func NewFormatter(format string) (Formatter, error) {
+	switch format {
+	case PrettyFormat:
+		return newPrettyFormatter(), nil
+	case JSONFormat:
+		return newJSONFormatter(), nil
+	default:
+		return nil, fmt.Errorf("Unknown format: %s", format)
+	}
+}
+
+type prettyFormatter struct{}
+
+func newPrettyFormatter() Formatter {
+	return &prettyFormatter{}
+}
+
+func (_ *prettyFormatter) Format(info *VersionInfo) (string, error) {
+	var buffer bytes.Buffer
+	buffer.WriteString(fmt.Sprintf("Consul %s\n", info.HumanVersion))
+	if info.Revision != "" {
+		buffer.WriteString(fmt.Sprintf("Revision %s\n", info.Revision))
+	}
+
+	var supplement string
+	if info.RPC.Default < info.RPC.Max {
+		supplement = fmt.Sprintf(" (agent will automatically use protocol >%d when speaking to compatible agents)",
+			info.RPC.Default)
+	}
+	buffer.WriteString(fmt.Sprintf("Protocol %d spoken by default, understands %d to %d%s\n",
+		info.RPC.Default, info.RPC.Min, info.RPC.Max, supplement))
+
+	return buffer.String(), nil
+}
+
+type jsonFormatter struct{}
+
+func newJSONFormatter() Formatter {
+	return &jsonFormatter{}
+}
+
+func (_ *jsonFormatter) Format(info *VersionInfo) (string, error) {
+	b, err := json.MarshalIndent(info, "", "   ")
+	if err != nil {
+		return "", fmt.Errorf("Failed to marshal version info: %v", err)
+	}
+	return string(b), nil
+}

command/version/formatter_test.go

@@ -0,0 +1,63 @@
+package version
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// update allows golden files to be updated based on the current output.
+var update = flag.Bool("update", false, "update golden files")
+
+// golden reads and optionally writes the expected data to the golden file,
+// returning the contents as a string.
+func golden(t *testing.T, name, got string) string {
+	t.Helper()
+
+	golden := filepath.Join("testdata", name+".golden")
+	if *update && got != "" {
+		err := ioutil.WriteFile(golden, []byte(got), 0644)
+		require.NoError(t, err)
+	}
+
+	expected, err := ioutil.ReadFile(golden)
+	require.NoError(t, err)
+
+	return string(expected)
+}
+
+func TestFormat(t *testing.T) {
+	info := VersionInfo{
+		HumanVersion: "1.99.3-beta1",
+		Version:      "1.99.3",
+		Prerelease:   "beta1",
+		Revision:     "5e5dbedd47a5f875b60e241c5555a9caab595246",
+		RPC: RPCVersionInfo{
+			Default: 2,
+			Min:     1,
+			Max:     3,
+		},
+	}
+
+	formatters := map[string]Formatter{
+		"pretty": newPrettyFormatter(),
+		// the JSON formatter ignores the showMeta
+		"json": newJSONFormatter(),
+	}
+
+	for fmtName, formatter := range formatters {
+		t.Run(fmtName, func(t *testing.T) {
+			actual, err := formatter.Format(&info)
+			require.NoError(t, err)
+
+			gName := fmt.Sprintf("%s", fmtName)
+
+			expected := golden(t, gName, actual)
+			require.Equal(t, expected, actual)
+		})
+	}
+}

command/version/testdata/json.golden

@@ -0,0 +1,10 @@
+{
+   "Version": "1.99.3",
+   "Revision": "5e5dbedd47a5f875b60e241c5555a9caab595246",
+   "Prerelease": "beta1",
+   "RPC": {
+      "Default": 2,
+      "Min": 1,
+      "Max": 3
+   }
+}

command/version/testdata/pretty.golden

@@ -0,0 +1,3 @@
+Consul 1.99.3-beta1
+Revision 5e5dbedd47a5f875b60e241c5555a9caab595246
+Protocol 2 spoken by default, understands 1 to 3 (agent will automatically use protocol >2 when speaking to compatible agents)

command/version/version.go

@@ -1,34 +1,80 @@
 package version
 
 import (
+	"flag"
 	"fmt"
+	"strings"
 
 	"github.com/hashicorp/consul/agent/consul"
+	"github.com/hashicorp/consul/command/flags"
+	"github.com/hashicorp/consul/version"
 	"github.com/mitchellh/cli"
 )
 
-func New(ui cli.Ui, version string) *cmd {
-	return &cmd{UI: ui, version: version}
+func New(ui cli.Ui) *cmd {
+	c := &cmd{UI: ui}
+	c.init()
+	return c
 }
 
 type cmd struct {
 	UI     cli.Ui
-	version string
+	flags  *flag.FlagSet
+	format string
+	help   string
 }
 
-func (c *cmd) Run(_ []string) int {
-	c.UI.Output(fmt.Sprintf("Consul %s", c.version))
+func (c *cmd) init() {
+	c.flags = flag.NewFlagSet("", flag.ContinueOnError)
+	c.flags.StringVar(
+		&c.format,
+		"format",
+		PrettyFormat,
+		fmt.Sprintf("Output format {%s}", strings.Join(GetSupportedFormats(), "|")))
+	c.help = flags.Usage(help, c.flags)
 
-	const rpcProtocol = consul.DefaultRPCProtocol
-
-	var supplement string
-	if rpcProtocol < consul.ProtocolVersionMax {
-		supplement = fmt.Sprintf(" (agent will automatically use protocol >%d when speaking to compatible agents)",
-			rpcProtocol)
 }
-	c.UI.Output(fmt.Sprintf("Protocol %d spoken by default, understands %d to %d%s",
-		rpcProtocol, consul.ProtocolVersionMin, consul.ProtocolVersionMax, supplement))
 
+type RPCVersionInfo struct {
+	Default int
+	Min     int
+	Max     int
+}
+
+type VersionInfo struct {
+	HumanVersion string `json:"-"`
+	Version      string
+	Revision     string
+	Prerelease   string
+	RPC          RPCVersionInfo
+}
+
+func (c *cmd) Run(args []string) int {
+	if err := c.flags.Parse(args); err != nil {
+		return 1
+	}
+
+	formatter, err := NewFormatter(c.format)
+	if err != nil {
+		c.UI.Error(err.Error())
+		return 1
+	}
+	out, err := formatter.Format(&VersionInfo{
+		HumanVersion: version.GetHumanVersion(),
+		Version:      version.Version,
+		Revision:     version.GitCommit,
+		Prerelease:   version.VersionPrerelease,
+		RPC: RPCVersionInfo{
+			Default: consul.DefaultRPCProtocol,
+			Min:     int(consul.ProtocolVersionMin),
+			Max:     consul.ProtocolVersionMax,
+		},
+	})
+	if err != nil {
+		c.UI.Error(err.Error())
+		return 1
+	}
+	c.UI.Output(out)
 	return 0
 }
 
@@ -37,5 +83,10 @@ func (c *cmd) Synopsis() string {
 }
 
 func (c *cmd) Help() string {
-	return ""
+	return flags.Usage(c.help, nil)
 }
+
+const synopsis = "Output Consul version information"
+const help = `
+Usage: consul version [options]
+`

command/version/version_test.go

@@ -9,7 +9,7 @@ import (
 
 func TestVersionCommand_noTabs(t *testing.T) {
 	t.Parallel()
-	if strings.ContainsRune(New(cli.NewMockUi(), "").Help(), '\t') {
+	if strings.ContainsRune(New(cli.NewMockUi()).Help(), '\t') {
 		t.Fatal("help has tabs")
 	}
 }

main.go

@@ -10,7 +10,6 @@ import (
 	"github.com/hashicorp/consul/command/version"
 	"github.com/hashicorp/consul/lib"
 	_ "github.com/hashicorp/consul/service_os"
-	consulversion "github.com/hashicorp/consul/version"
 	"github.com/mitchellh/cli"
 )
 
@@ -43,7 +42,7 @@ func realMain() int {
 	}
 
 	if cli.IsVersion() {
-		cmd := version.New(ui, consulversion.GetHumanVersion())
+		cmd := version.New(ui)
 		return cmd.Run(nil)
 	}
 

website/pages/docs/commands/version.mdx

@@ -13,8 +13,33 @@ Command: `consul version`
 
 The `version` command prints the version of Consul and the protocol versions it understands for speaking to other agents.
 
+## Usage
+
+Usage: `consul version [options]`
+
+### Command Options
+
+- `-format={pretty|json}` - Command output format. The default value is `pretty`.
+
+## Plain Output
 ```shell-session
 $ consul version
-Consul v0.7.4
+Consul v1.7.0
+Revision d1fc59061
 Protocol 2 spoken by default, understands 2 to 3 (agent will automatically use protocol >2 when speaking to compatible agents)
 ```
+
+## JSON Output
+```shell-session
+$ consul version -format=json
+{
+   "Version": "1.8.0",
+   "Revision": "d1fc59061",
+   "Prerelease": "dev",
+   "RPC": {
+      "Default": 2,
+      "Min": 2,
+      "Max": 3
+   }
+}
+```