ZYpp

ZYPP is the package management engine used by openSUSE and SUSE Linux distributions. It provides the backend for RPM-based package management, handling dependency resolution, repository management, and transaction processing. User-facing tools such as zypper and YaST software management rely on ZYPP to perform install, update, and removal operations.

The core component is libzypp, a C++ library that models packages, repositories, and the installation state as a pool of solvable items. It includes a dependency solver that computes a consistent set of actions to satisfy a request, and a transaction system that can commit or rollback changes atomically. libzypp also handles metadata caching, package selection, obsoletes/provides, and repository synchronization.

Key features include multi-repository support, robust dependency resolution with conflict handling, transactional updates with rollback, and tight integration with the RPM packaging system. It tracks installed and available packages, supports constraints such as architecture and version, and provides tooling for repository management.

ZYPP originated in the openSUSE project and became the standard backend for SUSE's distribution management on both openSUSE and SUSE Linux Enterprise Server. It powers the zypper command-line tool and the YaST software manager, and is maintained as an open-source project.