Add basic check on correct service is defined for profile runs

cli/cmd/run.go

@@ -6,6 +6,7 @@ package cmd
 
 import (
 	"context"
+	"os"
 	"strings"
 
 	"github.com/elastic/e2e-testing/cli/config"
@@ -78,7 +79,11 @@ func buildRunProfileCommand(key string, profile config.Profile) *cobra.Command {
 	return &cobra.Command{
 		Use:   key,
 		Short: `Runs the ` + profile.Name + ` profile`,
-		Long:  `Runs the ` + profile.Name + ` profile, spinning up the Services that compound it`,
+		Long: `Runs the ` + profile.Name + ` profile, spinning up the Services that compound it
+
+Example:
+  go run main.go run profile fleet -s elastic-agent:8.0.0-SNAPSHOT
+`,
 		Run: func(cmd *cobra.Command, args []string) {
 			serviceManager := services.NewServiceManager()
 
@@ -99,6 +104,13 @@ func buildRunProfileCommand(key string, profile config.Profile) *cobra.Command {
 
 				for _, srv := range services {
 					arr := strings.Split(srv, ":")
+					if len(arr) != 2 {
+						log.WithFields(log.Fields{
+							"profile":  key,
+							"services": servicesToRun,
+						}).Error("Unable to determine the <image>:<tag>, please make sure to use a known docker tag format, eg. `elastic-agent:8.0.0-SNAPSHOT`")
+						os.Exit(1)
+					}
 					image := arr[0]
 					tag := arr[1]