import type { ProcessIdentity } from './upgrade-job.js';
export interface UpgradeLockOwner {
    schemaVersion: 1;
    jobId: string;
    nonce: string;
    dataRoot: string;
    controller: ProcessIdentity;
    worker?: ProcessIdentity;
    createdAt: string;
}
export interface UpgradeLock {
    path: string;
    owner: UpgradeLockOwner;
    tryClaimControllerCleanup(): boolean;
    tryReclaimDeadWorkerCleanup(worker: ProcessIdentity): boolean;
    abandonControllerCleanup(): void;
    release(): void;
}
export declare function getUpgradeLockPath(): string;
export declare function loadUpgradeLockOwner(): UpgradeLockOwner;
export declare function acquireUpgradeLock(jobId: string, nonce?: string): UpgradeLock;
export declare function assignUpgradeLockWorker(jobId: string, nonce: string, worker: ProcessIdentity): UpgradeLockOwner;
export declare function releaseUpgradeLockForWorker(jobId: string, nonce: string, worker: ProcessIdentity): void;
export declare function hasUpgradeLock(): boolean;
export declare function isUpgradeLockGenerationActive(jobId: string, nonce: string): boolean;
export declare function loadUpgradeLockWorkerClaim(): ProcessIdentity | null;
export declare function reclaimStaleUpgradeLock(jobId: string, nonce: string): boolean;