terraform/moduledeps/dependencies.go

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package moduledeps
import (
"github.com/hashicorp/terraform/plugin/discovery"
)
// Providers describes a set of provider dependencies for a given module.
//
// Each named provider instance can have one version constraint.
type Providers map[ProviderInstance]ProviderDependency
// ProviderDependency describes the dependency for a particular provider
// instance, including both the set of allowed versions and the reason for
// the dependency.
type ProviderDependency struct {
Constraints discovery.Constraints
Reason ProviderDependencyReason
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}
// ProviderDependencyReason is an enumeration of reasons why a dependency might be
// present.
type ProviderDependencyReason int
const (
// ProviderDependencyExplicit means that there is an explicit "provider"
// block in the configuration for this module.
ProviderDependencyExplicit ProviderDependencyReason = iota
// ProviderDependencyImplicit means that there is no explicit "provider"
// block but there is at least one resource that uses this provider.
ProviderDependencyImplicit
// ProviderDependencyInherited is a special case of
// ProviderDependencyImplicit where a parent module has defined a
// configuration for the provider that has been inherited by at least one
// resource in this module.
ProviderDependencyInherited
// ProviderDependencyFromState means that this provider is not currently
// referenced by configuration at all, but some existing instances in
// the state still depend on it.
ProviderDependencyFromState
)