import { type ServiceDefinitionSnapshot } from "./service-definitions.js";
import { type ServiceInstanceSnapshot } from "./service-instances.js";
/** The OS controls an already recorded unit, never an executable inferred from the definition
 *  name. Startup may update the instance from inside the unit, so no instance writer lock is held
 *  across a systemctl start request. A retained action blocks every new control request. */
export declare function controlSystemdService(definition: ServiceDefinitionSnapshot, selected: ServiceInstanceSnapshot, operation: "start" | "stop"): Promise<{
    instance: ServiceInstanceSnapshot;
    unit: string;
    operation: "start";
    attemptId: null;
    reseed: null;
    noOp: true;
} | {
    instance: ServiceInstanceSnapshot;
    unit: string;
    operation: "stop";
    attemptId: null;
    reseed: null;
    noOp: true;
} | {
    instance: ServiceInstanceSnapshot;
    unit: string;
    operation: "start" | "stop";
    attemptId: string;
    reseed: {
        instanceId: string;
        generation: string;
        noOp: true;
        attemptId?: undefined;
    } | {
        instanceId: string;
        generation: string;
        noOp: false;
        attemptId: string;
    } | null;
    noOp: false;
}>;
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