feat: allow for setup.sh based user fixtures

internal/miro/setup_scripts.go

@@ -0,0 +1,61 @@
+package miro
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	setupScriptName     = "setup.sh"
+	setupScriptsEnvName = "MIRO_SETUP_SCRIPTS"
+)
+
+func discoverSetupScripts(testDir, scenarioDir string) ([]string, error) {
+	absTestDir, err := filepath.Abs(testDir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve test directory path: %v", err)
+	}
+
+	absScenarioDir, err := filepath.Abs(scenarioDir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve scenario directory path: %v", err)
+	}
+
+	relToTestDir, err := filepath.Rel(absTestDir, absScenarioDir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve scenario directory %q: %v", absScenarioDir, err)
+	}
+	if !isWithinBase(relToTestDir) {
+		return nil, fmt.Errorf("scenario directory %q must be inside test directory %q", absScenarioDir, absTestDir)
+	}
+
+	dirs := []string{absTestDir}
+	if relToTestDir != "." {
+		current := absTestDir
+		for _, part := range strings.Split(relToTestDir, string(os.PathSeparator)) {
+			current = filepath.Join(current, part)
+			dirs = append(dirs, current)
+		}
+	}
+
+	scripts := make([]string, 0, len(dirs))
+	for _, dir := range dirs {
+		path := filepath.Join(dir, setupScriptName)
+		info, err := os.Stat(path)
+		if err == nil {
+			if info.IsDir() {
+				return nil, fmt.Errorf("setup fixture %q is a directory", path)
+			}
+			scripts = append(scripts, path)
+			continue
+		}
+		if !errors.Is(err, os.ErrNotExist) {
+			return nil, fmt.Errorf("failed to check setup fixture %q: %v", path, err)
+		}
+	}
+
+	return scripts, nil
+}