regctl: manifestGet

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

src/regclient/regctl.ts

@@ -19,10 +19,17 @@ import * as semver from 'semver';
 
 import {Exec} from '../exec';
 
+import {Manifest} from '../types/oci/manifest';
+
 export interface RegctlOpts {
   binPath?: string;
 }
 
+export interface RegctlManifestGetOpts {
+  image: string;
+  platform?: string;
+}
+
 export class Regctl {
   private readonly binPath: string;
   private _version: string;
@@ -34,6 +41,18 @@ export class Regctl {
     this._versionOnce = false;
   }
 
+  public async manifestGet(opts: RegctlManifestGetOpts): Promise<Manifest> {
+    return await Exec.getExecOutput(this.binPath, ['manifest', 'get', opts.image, `--platform=${opts.platform ?? 'local'}`, `--format={{json .}}`], {
+      ignoreReturnCode: true,
+      silent: true
+    }).then(res => {
+      if (res.stderr.length > 0 && res.exitCode != 0) {
+        throw new Error(res.stderr.trim());
+      }
+      return <Manifest>JSON.parse(res.stdout.trim());
+    });
+  }
+
   public async isAvailable(): Promise<boolean> {
     const ok: boolean = await Exec.getExecOutput(this.binPath, [], {
       ignoreReturnCode: true,