fix: handle composite action on error and continue

This change is a follow up of nektos#840
and integrates with nektos#793

There are two things included here:

- The default value for a step.if in an action need to be 'success()'
- We need to hand the error from a composite action back to the
  calling executor

Co-authored-by: Björn Brauer <bjoern.brauer@new-work.se>

pkg/model/action.go

@@ -83,5 +83,16 @@ type Output struct {
 func ReadAction(in io.Reader) (*Action, error) {
 	a := new(Action)
 	err := yaml.NewDecoder(in).Decode(a)
-	return a, err
+	if err != nil {
+		return nil, err
+	}
+
+	for i, _ := range a.Runs.Steps {
+		step := &a.Runs.Steps[i]
+		if (*step).If.Value == "" {
+			(*step).If.Value = "success()"
+		}
+	}
+
+	return a, nil
 }

pkg/runner/run_context.go

@@ -340,6 +340,10 @@ func (rc *RunContext) CompositeExecutor() common.Executor {
 		stepcopy := step
 		steps = append(steps, rc.newStepExecutor(&stepcopy))
 	}
+
+	steps = append(steps, func(ctx context.Context) error {
+		return common.JobError(ctx)
+	})
 	return common.NewPipelineExecutor(steps...)
 }
 

pkg/runner/runner_test.go

@@ -118,6 +118,7 @@ func TestRunEvent(t *testing.T) {
 		{"testdata", "workdir", "push", "", platforms, ""},
 		{"testdata", "defaults-run", "push", "", platforms, ""},
 		{"testdata", "uses-composite", "push", "", platforms, ""},
+		{"testdata", "uses-composite-with-error", "push", "Job 'failing-composite-action' failed", platforms, ""},
 		{"testdata", "uses-nested-composite", "push", "", platforms, ""},
 		{"testdata", "issue-597", "push", "", platforms, ""},
 		{"testdata", "issue-598", "push", "", platforms, ""},

pkg/runner/testdata/uses-composite-with-error/composite_action2/action.yml

@@ -0,0 +1,11 @@
+---
+name: "Test Composite Action"
+description: "Test action uses composite"
+
+runs:
+  using: "composite"
+  steps:
+  - run: exit 1
+    shell: bash
+  - run: echo should not run in composite steps
+    shell: bash

pkg/runner/testdata/uses-composite-with-error/push.yml

@@ -0,0 +1,12 @@
+name: uses-docker-url
+on: push
+
+jobs:
+  failing-composite-action:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ./uses-composite-with-error/composite_action2
+    - run: echo should run
+      if: failure()
+    - run: echo should not run