Add support for runs-on array form (closes #146) (#155)

* Add support for runs-on array form (closes #146)

* Fixed style issues

Co-authored-by: Casey Lee <cplee@nektos.com>

pkg/model/workflow.go

@@ -56,7 +56,7 @@ func (w *Workflow) On() []string {
 type Job struct {
 	Name           string                    `yaml:"name"`
 	RawNeeds       yaml.Node                 `yaml:"needs"`
-	RunsOn         string                    `yaml:"runs-on"`
+	RawRunsOn      yaml.Node                 `yaml:"runs-on"`
 	Env            map[string]string         `yaml:"env"`
 	If             string                    `yaml:"if"`
 	Steps          []*Step                   `yaml:"steps"`
@@ -115,6 +115,28 @@ func (j *Job) Needs() []string {
 	return nil
 }
 
+// RunsOn list for Job
+func (j *Job) RunsOn() []string {
+
+	switch j.RawRunsOn.Kind {
+	case yaml.ScalarNode:
+		var val string
+		err := j.RawRunsOn.Decode(&val)
+		if err != nil {
+			log.Fatal(err)
+		}
+		return []string{val}
+	case yaml.SequenceNode:
+		var val []string
+		err := j.RawRunsOn.Decode(&val)
+		if err != nil {
+			log.Fatal(err)
+		}
+		return val
+	}
+	return nil
+}
+
 // GetMatrixes returns the matrix cross product
 func (j *Job) GetMatrixes() []map[string]interface{} {
 	matrixes := make([]map[string]interface{}, 0)

pkg/runner/run_context.go

@@ -55,16 +55,7 @@ func (rc *RunContext) jobContainerName() string {
 }
 
 func (rc *RunContext) startJobContainer() common.Executor {
-	job := rc.Run.Job()
-
-	var image string
-	c := job.Container()
-	if c != nil {
-		image = c.Image
-	} else {
-		platformName := rc.ExprEval.Interpolate(job.RunsOn)
-		image = rc.Config.Platforms[strings.ToLower(platformName)]
-	}
+	image := rc.platformImage()
 
 	return func(ctx context.Context) error {
 		rawLogger := common.Logger(ctx).WithField("raw_output", true)
@@ -221,6 +212,25 @@ func (rc *RunContext) newStepExecutor(step *model.Step) common.Executor {
 	}
 }
 
+func (rc *RunContext) platformImage() string {
+	job := rc.Run.Job()
+
+	c := job.Container()
+	if c != nil {
+		return c.Image
+	}
+
+	for _, runnerLabel := range job.RunsOn() {
+		platformName := rc.ExprEval.Interpolate(runnerLabel)
+		image := rc.Config.Platforms[strings.ToLower(platformName)]
+		if image != "" {
+			return image
+		}
+	}
+
+	return ""
+}
+
 func (rc *RunContext) isEnabled(ctx context.Context) bool {
 	job := rc.Run.Job()
 	log := common.Logger(ctx)
@@ -229,9 +239,9 @@ func (rc *RunContext) isEnabled(ctx context.Context) bool {
 		return false
 	}
 
-	platformName := rc.ExprEval.Interpolate(rc.Run.Job().RunsOn)
-	if img, ok := rc.Config.Platforms[strings.ToLower(platformName)]; !ok || img == "" {
-		log.Infof("\U0001F6A7  Skipping unsupported platform '%s'", platformName)
+	img := rc.platformImage()
+	if img == "" {
+		log.Infof("\U0001F6A7  Skipping unsupported platform '%+v'", job.RunsOn())
 		return false
 	}
 	return true

pkg/runner/testdata/runs-on/push.yml

@@ -8,3 +8,17 @@ jobs:
     - run: env
     - run: echo ${GITHUB_ACTOR} 
     - run: echo ${GITHUB_ACTOR} | grep nektos/act
+
+  many:
+    runs-on: [ubuntu-latest]
+    steps:
+      - run: env
+      - run: echo ${GITHUB_ACTOR}
+      - run: echo ${GITHUB_ACTOR} | grep nektos/act
+
+  selfmany:
+    runs-on: [self-hosted, ubuntu-latest]
+    steps:
+      - run: env
+      - run: echo ${GITHUB_ACTOR}
+      - run: echo ${GITHUB_ACTOR} | grep nektos/act