fix 99: support string and map variants of container

pkg/model/workflow.go

@@ -61,9 +61,9 @@ type Job struct {
 	If             string                    `yaml:"if"`
 	Steps          []*Step                   `yaml:"steps"`
 	TimeoutMinutes int64                     `yaml:"timeout-minutes"`
-	Container      *ContainerSpec            `yaml:"container"`
 	Services       map[string]*ContainerSpec `yaml:"services"`
 	Strategy       *Strategy                 `yaml:"strategy"`
+	RawContainer   yaml.Node                 `yaml:"container"`
 }
 
 // Strategy for the job
@@ -73,6 +73,26 @@ type Strategy struct {
 	Matrix      map[string][]interface{} `yaml:"matrix"`
 }
 
+// Container details for the job
+func (j *Job) Container() *ContainerSpec {
+	var val *ContainerSpec
+	switch j.RawContainer.Kind {
+	case yaml.ScalarNode:
+		val = new(ContainerSpec)
+		err := j.RawContainer.Decode(&val.Image)
+		if err != nil {
+			log.Fatal(err)
+		}
+	case yaml.MappingNode:
+		val = new(ContainerSpec)
+		err := j.RawContainer.Decode(val)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+	return val
+}
+
 // Needs list for Job
 func (j *Job) Needs() []string {
 

pkg/model/workflow_test.go

@@ -70,3 +70,31 @@ jobs:
 	assert.Contains(t, workflow.On(), "push")
 	assert.Contains(t, workflow.On(), "pull_request")
 }
+
+func TestReadWorkflow_StringContainer(t *testing.T) {
+	yaml := `
+name: local-action-docker-url
+
+jobs:
+  test:
+    container: nginx:latest
+    runs-on: ubuntu-latest
+    steps:
+    - uses: ./actions/docker-url
+  test2:
+    container: 
+      image: nginx:latest
+      env:
+        foo: bar
+    runs-on: ubuntu-latest
+    steps:
+    - uses: ./actions/docker-url
+`
+
+	workflow, err := ReadWorkflow(strings.NewReader(yaml))
+	assert.NoError(t, err, "read workflow should succeed")
+	assert.Len(t, workflow.Jobs, 2)
+	assert.Contains(t, workflow.Jobs["test"].Container().Image, "nginx:latest")
+	assert.Contains(t, workflow.Jobs["test2"].Container().Image, "nginx:latest")
+	assert.Contains(t, workflow.Jobs["test2"].Container().Env["foo"], "bar")
+}

pkg/runner/run_context.go

@@ -53,8 +53,9 @@ func (rc *RunContext) startJobContainer() common.Executor {
 	job := rc.Run.Job()
 
 	var image string
-	if job.Container != nil {
-		image = job.Container.Image
+	c := job.Container()
+	if c != nil {
+		image = c.Image
 	} else {
 		platformName := rc.ExprEval.Interpolate(job.RunsOn)
 		image = rc.Config.Platforms[strings.ToLower(platformName)]

pkg/runner/step_context.go

@@ -87,8 +87,9 @@ func (sc *StepContext) setupEnv() common.Executor {
 	step := sc.Step
 	return func(ctx context.Context) error {
 		var env map[string]string
-		if job.Container != nil {
-			env = mergeMaps(rc.GetEnv(), job.Container.Env, step.GetEnv())
+		c := job.Container()
+		if c != nil {
+			env = mergeMaps(rc.GetEnv(), c.Env, step.GetEnv())
 		} else {
 			env = mergeMaps(rc.GetEnv(), step.GetEnv())
 		}

pkg/runner/testdata/job-container/push.yml

@@ -10,3 +10,11 @@ jobs:
         TEST_ENV: test-value
     steps:
       - run: echo ${TEST_ENV} | grep test-value
+
+  test2:
+    runs-on: ubuntu-latest
+    container: node:10.16-jessie
+    steps:
+      - run: echo ${TEST_ENV} | grep test-value
+        env:
+          TEST_ENV: test-value