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// SPDX-License-Identifier: MPL-2.0
//! Handling pubgrub errors.
use thiserror::Error;
use crate::package::Package;
use crate::report::DerivationTree;
use crate::version::Version;
/// Errors that may occur while solving dependencies.
#[derive(Error, Debug)]
pub enum PubGrubError<P: Package, V: Version> {
/// There is no solution for this set of dependencies.
#[error("No solution")]
NoSolution(DerivationTree<P, V>),
/// Error arising when the implementer of
/// [DependencyProvider](crate::solver::DependencyProvider)
/// returned an error in the method
/// [get_dependencies](crate::solver::DependencyProvider::get_dependencies).
#[error("Retrieving dependencies of {package} {version} failed")]
ErrorRetrievingDependencies {
/// Package whose dependencies we want.
package: P,
/// Version of the package for which we want the dependencies.
version: V,
/// Error raised by the implementer of
/// [DependencyProvider](crate::solver::DependencyProvider).
source: Box<dyn std::error::Error>,
},
/// Error arising when the implementer of
/// [DependencyProvider](crate::solver::DependencyProvider)
/// returned a dependency on an empty range.
/// This technically means that the package can not be selected,
/// but is clearly some kind of mistake.
#[error("Package {dependent} required by {package} {version} depends on the empty set")]
DependencyOnTheEmptySet {
/// Package whose dependencies we want.
package: P,
/// Version of the package for which we want the dependencies.
version: V,
/// The dependent package that requires us to pick from the empty set.
dependent: P,
},
/// Error arising when the implementer of
/// [DependencyProvider](crate::solver::DependencyProvider)
/// returned a dependency on the requested package.
/// This technically means that the package directly depends on itself,
/// and is clearly some kind of mistake.
#[error("{package} {version} depends on itself")]
SelfDependency {
/// Package whose dependencies we want.
package: P,
/// Version of the package for which we want the dependencies.
version: V,
},
/// Error arising when the implementer of
/// [DependencyProvider](crate::solver::DependencyProvider)
/// returned an error in the method
/// [choose_package_version](crate::solver::DependencyProvider::choose_package_version).
#[error("Decision making failed")]
ErrorChoosingPackageVersion(Box<dyn std::error::Error>),
/// Error arising when the implementer of [DependencyProvider](crate::solver::DependencyProvider)
/// returned an error in the method [should_cancel](crate::solver::DependencyProvider::should_cancel).
#[error("We should cancel")]
ErrorInShouldCancel(Box<dyn std::error::Error>),
/// Something unexpected happened.
#[error("{0}")]
Failure(String),
}