errors

const (
	// ProvisioningStateInconsistent is returned by SetProvisioningState when the provisioning state
	// is inconsistent with the application scale.
	ProvisioningStateInconsistent = errors.ConstError("provisioning state is inconsistent")

	// ErrApplicationShouldNotHaveUnits is returned by SetCharm when the application has units when
	// it is expected to not have units. Used for upgrading from podspec to sidecar charms.
	ErrApplicationShouldNotHaveUnits = errors.ConstError("application should not have units")
)

const (
	// ErrCannotEnterScope indicates that a relation unit failed to enter its scope
	// due to either the unit or the relation not being Alive.
	ErrCannotEnterScope = errors.ConstError("cannot enter scope")

	// ErrCannotEnterScopeYet indicates that a relation unit failed to enter its
	// scope due to a required and pre-existing subordinate unit that is not Alive.
	// Once that subordinate has been removed, a new one can be created.
	ErrCannotEnterScopeYet = errors.ConstError("cannot enter scope yet")

	// ErrCharmRevisionAlreadyModified is returned when a pending or
	// placeholder charm is no longer pending or a placeholder, signaling
	// the charm is available in state with its full information.
	ErrCharmRevisionAlreadyModified = errors.ConstError("charm revision already modified")

	ErrDead = errors.ConstError("not found or dead")

	ErrUpgradeInProgress = errors.ConstError("upgrade in progress")

	// IncompatibleBaseError indicates the base selected is not supported by
	// the charm.
	IncompatibleBaseError = errors.ConstError("incompatible base for charm")
)

const (
	HasAssignedUnitsError = errors.ConstError("has assigned units")

	// HasAttachmentsError indicates that an attempt to destroy
	// a machine failed due to it having storage attachments.
	HasAttachmentsError = errors.ConstError("machine has attachments")

	// HasContainersError indicates that the machine had attempted to be
	// destroyed with containers still running.
	HasContainersError = errors.ConstError("machine is hosting containers")

	// IsControllerMemberError indicates the machine had attempted to be
	// destroyed whilst still considered a controller.
	IsControllerMemberError = errors.ConstError("machine is still a controller member")
)

const (
	// HasHostedModelsError defines if an attempt was made to destroy the
	// controller model while it contained non-empty hosted models, without
	// specifying that they should also be destroyed.
	HasHostedModelsError = errors.ConstError("has hosted models")

	// ModelNotEmptyError reports whether or not the given error was caused
	// due to an operation requiring a model to be empty, where the model is
	// non-empty.
	ModelNotEmptyError = errors.ConstError("model not empty")

	// PersistentStorageError indicates  whether or not the given error was
	// caused by an attempt to destroy a model while it contained persistent
	// storage, without specifying how the storage should be removed
	// (destroyed or released).
	PersistentStorageError = errors.ConstError("model contains persistent storage")
)

const (
	// ErrUnitHasSubordinates is a standard error to indicate that a Unit
	// cannot complete an operation to end its life because it still has
	// subordinate applications.
	ErrUnitHasSubordinates = errors.ConstError("unit has subordinates")

	// ErrUnitHasStorageAttachments is a standard error to indicate that
	// a Unit cannot complete an operation to end its life because it still
	// has storage attachments.
	ErrUnitHasStorageAttachments = errors.ConstError("unit has storage attachments")
)

const (
	// StorageAttachedError reports whether or not the given error was caused
	// by an operation on storage that should not be, but is, attached.
	StorageAttachedError = errors.ConstError("storage is attached")
)