fix region error. fix env vars not propagated to task if -s not provided

.gitignore

@@ -1 +1,3 @@
 /build/*
+__debug_bin
+.vscode/

README.md

@@ -27,6 +27,7 @@ GLOBAL OPTIONS:
    --env KEY=value, -e KEY=value  An environment variable to add in the form KEY=value or `KEY` (shorthand for `KEY=$KEY` to pass through an env var from the current host). Can be specified multiple times
    --inherit-env, -E              Inherit all of the environment variables from the calling shell
    --count value, -C value        Number of tasks to run (default: 1)
+   --region value, -r value       AWS Region
    --deregister                   Deregister task definition once done
    --help, -h                     show help
    --version, -v                  print the version

go.mod

@@ -15,3 +15,5 @@ require (
 	golang.org/x/text v0.3.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )
+
+go 1.13

main.go

@@ -75,6 +75,10 @@ func main() {
 			Value: 1,
 			Usage: "Number of tasks to run",
 		},
+		&cli.StringFlag{
+			Name:  "region, r",
+			Usage: "AWS Region",
+		},
 		&cli.BoolFlag{
 			Name:  "deregister",
 			Usage: "Deregister task definition once done",
@@ -104,6 +108,10 @@ func main() {
 		r.Count = ctx.Int64("count")
 		r.Deregister = ctx.Bool("deregister")
 
+		if r.Region == "" {
+			r.Region = ctx.String("region")
+		}
+
 		if ctx.Bool("inherit-env") {
 			for _, env := range os.Environ() {
 				r.Environment = append(r.Environment, env)

runner/runner.go

@@ -18,11 +18,13 @@ import (
 	"github.com/buildkite/ecs-run-task/parser"
 )
 
+// Override ..
 type Override struct {
 	Service string
 	Command []string
 }
 
+// Runner ..
 type Runner struct {
 	Service            string
 	TaskName           string
@@ -40,13 +42,15 @@ type Runner struct {
 	Deregister         bool
 }
 
+// New creates a new instance of a runner
 func New() *Runner {
 	return &Runner{
 		Region: os.Getenv("AWS_REGION"),
 		Config: aws.NewConfig(),
 	}
 }
 
+// Run runs the runner
 func (r *Runner) Run(ctx context.Context) error {
 	taskDefinitionInput, err := parser.Parse(r.TaskDefinitionFile, os.Environ())
 	if err != nil {
@@ -58,7 +62,7 @@ func (r *Runner) Run(ctx context.Context) error {
 		streamPrefix = fmt.Sprintf("run_task_%d", time.Now().Nanosecond())
 	}
 
-	sess := session.Must(session.NewSession(r.Config))
+	sess := session.Must(session.NewSession(r.Config.WithRegion(r.Region)))
 
 	if err := createLogGroup(sess, r.LogGroupName); err != nil {
 		return err
@@ -124,6 +128,11 @@ func (r *Runner) Run(ctx context.Context) error {
 		}
 	}
 
+	env, err := awsKeyValuePairForEnv(os.LookupEnv, r.Environment)
+	if err != nil {
+		return err
+	}
+
 	for _, override := range r.Overrides {
 		if len(override.Command) > 0 {
 			cmds := []*string{}
@@ -141,11 +150,6 @@ func (r *Runner) Run(ctx context.Context) error {
 				cmds = append(cmds, aws.String(command))
 			}
 
-			env, err := awsKeyValuePairForEnv(os.LookupEnv, r.Environment)
-			if err != nil {
-				return err
-			}
-
 			runTaskInput.Overrides.ContainerOverrides = append(
 				runTaskInput.Overrides.ContainerOverrides,
 				&ecs.ContainerOverride{
@@ -157,6 +161,17 @@ func (r *Runner) Run(ctx context.Context) error {
 		}
 	}
 
+	// If no overrides specified, but Environment variables were - should still be overridden
+	if len(r.Overrides) == 0 {
+		runTaskInput.Overrides.ContainerOverrides = append(
+			runTaskInput.Overrides.ContainerOverrides,
+			&ecs.ContainerOverride{
+				Name:        taskDefinitionInput.ContainerDefinitions[0].Name,
+				Environment: env,
+			},
+		)
+	}
+
 	log.Printf("Running task %s", taskDefinition)
 	runResp, err := svc.RunTask(runTaskInput)
 	if err != nil {
@@ -169,7 +184,7 @@ func (r *Runner) Run(ctx context.Context) error {
 	// spawn a log watcher for each container
 	for _, task := range runResp.Tasks {
 		for _, container := range task.Containers {
-			containerId := path.Base(*container.ContainerArn)
+			containerID := path.Base(*container.ContainerArn)
 			watcher := &logWatcher{
 				LogGroupName:   r.LogGroupName,
 				LogStreamName:  logStreamName(streamPrefix, container, task),
@@ -179,11 +194,11 @@ func (r *Runner) Run(ctx context.Context) error {
 				Printer: func(ev *cloudwatchlogs.FilteredLogEvent) bool {
 					finishedPrefix := fmt.Sprintf(
 						"Container %s exited with",
-						containerId,
+						containerID,
 					)
 					if strings.HasPrefix(*ev.Message, finishedPrefix) {
 						log.Printf("Found container finished message for %s: %s",
-							containerId, *ev.Message)
+							containerID, *ev.Message)
 						return false
 					}
 					fmt.Println(*ev.Message)