Plugins: Add -version flag to 'vault plugin info' (#17454)

* Add -version flag to 'vault plugin info'
* Allow specifying a builtin tag when reading a single plugin from the catalog

command/plugin_info.go

@@ -17,6 +17,8 @@ var (
 
 type PluginInfoCommand struct {
 	*BaseCommand
+
+	flagVersion string
 }
 
 func (c *PluginInfoCommand) Synopsis() string {
@@ -41,7 +43,18 @@ Usage: vault plugin info [options] TYPE NAME
 }
 
 func (c *PluginInfoCommand) Flags() *FlagSets {
-	return c.flagSet(FlagSetHTTP | FlagSetOutputField | FlagSetOutputFormat)
+	set := c.flagSet(FlagSetHTTP | FlagSetOutputField | FlagSetOutputFormat)
+
+	f := set.NewFlagSet("Command Options")
+
+	f.StringVar(&StringVar{
+		Name:       "version",
+		Target:     &c.flagVersion,
+		Completion: complete.PredictAnything,
+		Usage:      "Semantic version of the plugin. Optional.",
+	})
+
+	return set
 }
 
 func (c *PluginInfoCommand) AutocompleteArgs() complete.Predictor {
@@ -93,8 +106,9 @@ func (c *PluginInfoCommand) Run(args []string) int {
 	pluginName := strings.TrimSpace(pluginNameRaw)
 
 	resp, err := client.Sys().GetPlugin(&api.GetPluginInput{
-		Name: pluginName,
-		Type: pluginType,
+		Name:    pluginName,
+		Type:    pluginType,
+		Version: c.flagVersion,
 	})
 	if err != nil {
 		c.UI.Error(fmt.Sprintf("Error reading plugin named %s: %s", pluginName, err))
@@ -113,6 +127,7 @@ func (c *PluginInfoCommand) Run(args []string) int {
 		"name":               resp.Name,
 		"sha256":             resp.SHA256,
 		"deprecation_status": resp.DeprecationStatus,
+		"version":            resp.Version,
 	}
 
 	if c.flagField != "" {