cli: add prefix ID and wildcard namespace support for service info (#18836)

The `nomad service info` command doesn't support using a wildcard namespace with
a prefix match, the way that we do for many other commands. Update the command
to do a prefix match list query for the services before making the get query.

Fixes: #18831

.changelog/18836.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+cli: Added support for prefix ID matching and wildcard namespaces to `service info` command
+```

command/service_info.go

@@ -114,14 +114,44 @@ func (s *ServiceInfoCommand) Run(args []string) int {
 		return 1
 	}
 
+	ns := s.Meta.namespace
+	serviceID := args[0]
+
 	// Set up the options to capture any filter passed.
 	opts := api.QueryOptions{
 		Filter:    filter,
-		PerPage:   int32(perPage),
-		NextToken: pageToken,
+		Prefix:    serviceID,
+		Namespace: ns,
+	}
+	services, _, err := client.Services().List(&opts)
+	if err != nil {
+		s.Ui.Error(fmt.Sprintf("Error listing service registrations: %s", err))
+		return 1
+	}
+	switch len(services) {
+	case 0:
+		s.Ui.Error(fmt.Sprintf("No service registrations with prefix %q found", serviceID))
+		return 1
+	case 1:
+		ns = services[0].Namespace
+		if len(services[0].Services) > 0 { // should always be valid
+			serviceID = services[0].Services[0].ServiceName
+		}
+	default:
+		s.Ui.Error(fmt.Sprintf("Prefix matched multiple services\n\n%s",
+			formatServiceListOutput(s.Meta.namespace, services)))
+		return 1
 	}
 
-	serviceInfo, qm, err := client.Services().Get(args[0], &opts)
+	// Set up the options to capture any filter passed.
+	opts = api.QueryOptions{
+		Filter:    filter,
+		PerPage:   int32(perPage),
+		NextToken: pageToken,
+		Namespace: ns,
+	}
+
+	serviceInfo, qm, err := client.Services().Get(serviceID, &opts)
 	if err != nil {
 		s.Ui.Error(fmt.Sprintf("Error listing service registrations: %s", err))
 		return 1

command/service_list.go

@@ -113,11 +113,11 @@ func (s *ServiceListCommand) Run(args []string) int {
 		return 0
 	}
 
-	s.formatOutput(list)
+	s.Ui.Output(formatServiceListOutput(s.Meta.namespace, list))
 	return 0
 }
 
-func (s *ServiceListCommand) formatOutput(regs []*api.ServiceRegistrationListStub) {
+func formatServiceListOutput(cmdNS string, regs []*api.ServiceRegistrationListStub) string {
 
 	// Create objects to hold sorted a sorted namespace array and a mapping, so
 	// we can perform service lookups on a namespace basis.
@@ -137,7 +137,7 @@ func (s *ServiceListCommand) formatOutput(regs []*api.ServiceRegistrationListStu
 
 	// If the request was made using the wildcard namespace, include this in
 	// the output.
-	if s.Meta.namespace == api.AllNamespacesNamespace {
+	if cmdNS == api.AllNamespacesNamespace {
 		outputTable[0] += "|Namespace"
 	}
 
@@ -171,7 +171,7 @@ func (s *ServiceListCommand) formatOutput(regs []*api.ServiceRegistrationListStu
 			// Build the output array entry.
 			regOutput := serviceName
 
-			if s.Meta.namespace == api.AllNamespacesNamespace {
+			if cmdNS == api.AllNamespacesNamespace {
 				regOutput += "|" + ns
 			}
 			regOutput += "|" + fmt.Sprintf("[%s]", strings.Join(tags, ","))
@@ -179,5 +179,5 @@ func (s *ServiceListCommand) formatOutput(regs []*api.ServiceRegistrationListStu
 		}
 	}
 
-	s.Ui.Output(formatList(outputTable))
+	return formatList(outputTable)
 }