bug/issue nektos#2448 - manage special bash options when no shell is defined

Author: sebastien-perpignane

pkg/model/workflow.go

@@ -572,6 +572,8 @@ type Step struct {
 	Uses               string            `yaml:"uses"`
 	Run                string            `yaml:"run"`
 	WorkingDirectory   string            `yaml:"working-directory"`
+	// WorkflowShell is the shell really configured in the job, directly at step level or higher in defaults.run.shell
+	WorkflowShell      string
 	Shell              string            `yaml:"shell"`
 	Env                yaml.Node         `yaml:"env"`
 	With               map[string]string `yaml:"with"`
@@ -614,8 +616,14 @@ func (s *Step) ShellCommand() string {
 
 	//Reference: https://github.com/actions/runner/blob/8109c962f09d9acc473d92c595ff43afceddb347/src/Runner.Worker/Handlers/ScriptHandlerHelpers.cs#L9-L17
 	switch s.Shell {
-	case "", "bash":
-		shellCommand = "bash --noprofile --norc -e -o pipefail {0}"
+	case "":
+		shellCommand = "bash -e {0}"
+	case "bash":
+		if s.WorkflowShell == "" {
+		  shellCommand = "bash -e {0}"
+		} else {
+		  shellCommand = "bash --noprofile --norc -e -o pipefail {0}"
+		}
 	case "pwsh":
 		shellCommand = "pwsh -command . '{0}'"
 	case "python":

pkg/runner/step_run.go

@@ -166,16 +166,16 @@ func (sr *stepRun) setupShell(ctx context.Context) {
 	step := sr.Step
 
 	if step.Shell == "" {
-		step.Shell = rc.Run.Job().Defaults.Run.Shell
+		step.WorkflowShell = rc.Run.Job().Defaults.Run.Shell
 	}
 
-	step.Shell = rc.NewExpressionEvaluator(ctx).Interpolate(ctx, step.Shell)
+	step.WorkflowShell = rc.NewExpressionEvaluator(ctx).Interpolate(ctx, step.Shell)
 
-	if step.Shell == "" {
-		step.Shell = rc.Run.Workflow.Defaults.Run.Shell
+	if step.WorkflowShell == "" {
+		step.WorkflowShell = rc.Run.Workflow.Defaults.Run.Shell
 	}
 
-	if step.Shell == "" {
+	if step.WorkflowShell == "" {
 		if _, ok := rc.JobContainer.(*container.HostEnvironment); ok {
 			shellWithFallback := []string{"bash", "sh"}
 			// Don't use bash on windows by default, if not using a docker container
@@ -196,6 +196,8 @@ func (sr *stepRun) setupShell(ctx context.Context) {
 			// Currently only linux containers are supported, use sh by default like actions/runner
 			step.Shell = "sh"
 		}
+	} else {
+		step.Shell = step.WorkflowShell
 	}
 }