Resolvo implements a fast package resolution algorithm based on CDCL SAT solving. If resolvo is unable to find a solution it outputs a human-readable error message:
The following packages are incompatible
|-- bluesky-widgets >=0, <100 can be installed with any of the following options:
|-- bluesky-widgets 42 would require
|-- suitcase-utils >=0, <54, which can be installed with any of the following options:
|-- suitcase-utils 53
|-- suitcase-utils >=54, <100 cannot be installed because there are no viable options:
|-- suitcase-utils 54, which conflicts with the versions reported above.
Resolve provides a generic interface which allows integrating the solver with a variety of package managers. For instance resolvo is used in rattler and pixi to solve packages from the conda ecosystem.
Originally resolvo started out as a port/fork of libsolv but it has since then diverged substantially. However, the same CDCL algorithm based on MiniSats An Extensible SAT-solver is still used underneath. Major differences compared to libsolv are:
- Resolvo does not come with built-in support for several packaging ecosystems but instead provides a generic interface to allow it to be used in different scenarios.
- Resolvo has support for incremental/lazy solving. This allows users to quickly find solutions in ecosystems where retrieving package metadata is expensive.
- Resolvo is considerably faster than libsolv in large complex cases.
- Resolvo can easily be used in multithreaded environments.
- Resolvo provides human-readable error messages out-of-the-box.
- However, Libsolv is more extensive and supports more complex queries.
We would love to have you contribute! See the CONTRIBUTION.md for more info. For questions, requests or a casual chat, we are very active on our discord server. You can join our discord server via this link.