docker/cli · error

duplicate generic-resource `%+v` for service task

Error message

duplicate generic-resource `%+v` for service task

What it means

Error "duplicate generic-resource `%+v` for service task" thrown in docker/cli.

Source

Thrown at cli/command/service/generic_resource_opts.go:61

				res.NamedResourceSpec.Kind, res.NamedResourceSpec.Value,
			)
		}
	}

	return swarmResources, nil
}

func buildGenericResourceMap(genericRes []swarm.GenericResource) (map[string]swarm.GenericResource, error) {
	m := make(map[string]swarm.GenericResource)

	for _, res := range genericRes {
		if res.DiscreteResourceSpec == nil {
			return nil, fmt.Errorf("invalid generic-resource `%+v` for service task", res)
		}

		_, ok := m[res.DiscreteResourceSpec.Kind]
		if ok {
			return nil, fmt.Errorf("duplicate generic-resource `%+v` for service task", res.DiscreteResourceSpec.Kind)
		}

		m[res.DiscreteResourceSpec.Kind] = res
	}

	return m, nil
}

func buildGenericResourceList(genericRes map[string]swarm.GenericResource) []swarm.GenericResource {
	l := make([]swarm.GenericResource, 0, len(genericRes))

	for _, res := range genericRes {
		l = append(l, res)
	}

	return l
}

View on GitHub (pinned to e9452d6e78)

When it happens

Trigger: Thrown at cli/command/service/generic_resource_opts.go:61 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of docker/cli@e9452d6e78 (2026-08-01). Data as JSON: /data/errors/ef8e54a13f5dda86.json. Report an issue: GitHub.