Function ValidateMappings

internal/validation/validation.go:163–183

ValidateMappings normalizes all mappings and rejects duplicate target refs.

(mappings []RefMapping, allowOther bool)

// ValidateMappings normalizes all mappings and rejects duplicate target refs.
func ValidateMappings(mappings []RefMapping, allowOther bool) ([]NormalizedMapping, error) {
	if len(mappings) == 0 {
		return nil, nil
	}

	normalized := make([]NormalizedMapping, 0, len(mappings))
	targetSeen := make(map[plumbing.ReferenceName]string, len(mappings))

	for _, m := range mappings {
		nm, err := NormalizeMapping(m, allowOther)
		if err != nil {
			return nil, err
		}
		if prev, exists := targetSeen[nm.TargetRef]; exists {
			return nil, fmt.Errorf("duplicate target ref %s: mapped from both %q and %q", nm.TargetRef, prev, m.Source)
		}
		targetSeen[nm.TargetRef] = m.Source
		normalized = append(normalized, nm)
	}
	return normalized, nil
}

const (
	kindBranch = "branch"