feat(base-images): add managed base image bundles with cache retention, hosted manifests, and opt-in integration boot testing

ts/interfaces/config.ts

@@ -16,6 +16,127 @@ export interface ISmartVMOptions {
   bridgeName?: string;
   /** Network subnet in CIDR notation. Defaults to '172.30.0.0/24'. */
   subnet?: string;
+  /** Directory for cached base images. Defaults to /tmp/.smartvm/base-images. */
+  baseImageCacheDir?: string;
+  /** Maximum number of cached base image bundles. Defaults to 2. */
+  maxStoredBaseImages?: number;
+  /** Hosted/project-owned base image manifest URL. */
+  baseImageManifestUrl?: string;
+  /** Local hosted/project-owned base image manifest path for development and tests. */
+  baseImageManifestPath?: string;
+}
+
+/**
+ * Predefined base image sources for integration testing and quick starts.
+ */
+export type TBaseImagePreset = 'latest' | 'lts' | 'hosted';
+
+/**
+ * Root filesystem image type used by a base image bundle.
+ */
+export type TBaseImageRootfsType = 'ext4' | 'squashfs';
+
+/**
+ * Options for the BaseImageManager.
+ */
+export interface IBaseImageManagerOptions {
+  /** Architecture to resolve. Defaults to x86_64. */
+  arch?: TFirecrackerArch;
+  /** Directory for cached base image bundles. Defaults to /tmp/.smartvm/base-images. */
+  cacheDir?: string;
+  /** Maximum number of cached base image bundles. Defaults to 2. */
+  maxStoredBaseImages?: number;
+  /** Hosted base image manifest URL for project-owned bundles. */
+  hostedManifestUrl?: string;
+  /** Local hosted base image manifest path for development and tests. */
+  hostedManifestPath?: string;
+}
+
+/**
+ * Options when resolving or downloading a base image bundle.
+ */
+export interface IEnsureBaseImageOptions {
+  /** Preset to use. Defaults to latest. */
+  preset?: TBaseImagePreset;
+  /** Architecture to resolve. Defaults to manager architecture. */
+  arch?: TFirecrackerArch;
+  /** Redownload even if the bundle already exists locally. */
+  forceDownload?: boolean;
+  /** Hosted base image manifest URL. Overrides preset resolution. */
+  manifestUrl?: string;
+  /** Local hosted base image manifest path. Overrides preset resolution. */
+  manifestPath?: string;
+}
+
+/**
+ * Single hosted base image artifact in a manifest.
+ */
+export interface IBaseImageArtifactManifest {
+  /** Public URL for hosted artifacts. */
+  url?: string;
+  /** Local path for development/tests. */
+  path?: string;
+  /** Optional plain output filename. Defaults to basename of url/path. */
+  fileName?: string;
+  /** Expected SHA256 for verification. Required when url is used. */
+  sha256?: string;
+  /** Expected file size in bytes. */
+  sizeBytes?: number;
+}
+
+/**
+ * Hosted/project-owned base image manifest format.
+ */
+export interface IBaseImageHostedManifest {
+  schemaVersion: 1;
+  bundleId: string;
+  name?: string;
+  arch: TFirecrackerArch;
+  firecrackerVersion: string;
+  rootfsType: TBaseImageRootfsType;
+  rootfsIsReadOnly?: boolean;
+  bootArgs?: string;
+  kernel: IBaseImageArtifactManifest;
+  rootfs: IBaseImageArtifactManifest;
+}
+
+/**
+ * Cached base image bundle metadata.
+ */
+export interface IBaseImageBundle {
+  preset: TBaseImagePreset;
+  arch: TFirecrackerArch;
+  ciVersion: string;
+  firecrackerVersion: string;
+  bundleId: string;
+  bundleDir: string;
+  kernelImagePath: string;
+  rootfsPath: string;
+  rootfsType: TBaseImageRootfsType;
+  rootfsIsReadOnly: boolean;
+  bootArgs: string;
+  source: {
+    type?: 'firecracker-ci' | 'hosted-manifest';
+    bucketUrl?: string;
+    kernelKey?: string;
+    rootfsKey?: string;
+    manifestUrl?: string;
+    manifestPath?: string;
+    kernelUrl?: string;
+    rootfsUrl?: string;
+    kernelSourcePath?: string;
+    rootfsSourcePath?: string;
+  };
+  checksums?: {
+    kernelSha256?: string;
+    rootfsSha256?: string;
+  };
+  sizes?: {
+    kernelBytes?: number;
+    rootfsBytes?: number;
+  };
+  createdAt: string;
+  lastAccessedAt: string;
 }
 
 /**
@@ -142,9 +263,9 @@ export interface ILoggerConfig {
   logPath: string;
   /** Log level. */
   level?: TLogLevel;
-  /** Whether to show log origin (file, line). */
-  showLevel?: boolean;
   /** Whether to show log level. */
+  showLevel?: boolean;
+  /** Whether to show log origin (file, line). */
   showLogOrigin?: boolean;
 }