Centralize managed state targets

internal/storage/path.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 )
 
-const stateFileName = ".distributor.json"
+const StateFileName = ".distributor.json"
 
 func ValidatePath(value string) error {
 	if value == "" {
@@ -37,9 +37,29 @@ func Join(base, child string) (string, error) {
 
 func StatePath(bundlePath string) (string, error) {
 	if bundlePath == "" {
-		return stateFileName, nil
+		return StateFileName, nil
 	}
-	return Join(bundlePath, stateFileName)
+	return Join(bundlePath, StateFileName)
+}
+
+func ManagedBundleTargets(bundlePath string, managedOutputPaths []string) ([]string, error) {
+	if err := ValidatePrefix(bundlePath); err != nil {
+		return nil, err
+	}
+	targets := make([]string, 0, len(managedOutputPaths)+1)
+	for _, outputPath := range managedOutputPaths {
+		target, err := Join(bundlePath, outputPath)
+		if err != nil {
+			return nil, err
+		}
+		targets = append(targets, target)
+	}
+	statePath, err := StatePath(bundlePath)
+	if err != nil {
+		return nil, err
+	}
+	targets = append(targets, statePath)
+	return targets, nil
 }
 
 func SortEntries(entries []Entry) {