regctl: blobGet func

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

src/regclient/regctl.ts

@@ -25,6 +25,11 @@ export interface RegctlOpts {
   binPath?: string;
 }
 
+export interface RegctlBlobGetOpts {
+  repository: string;
+  digest: string;
+}
+
 export interface RegctlManifestGetOpts {
   image: string;
   platform?: string;
@@ -41,6 +46,19 @@ export class Regctl {
     this._versionOnce = false;
   }
 
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  public async blobGet(opts: RegctlBlobGetOpts): Promise<any> {
+    return await Exec.getExecOutput(this.binPath, ['blob', 'get', opts.repository, opts.digest], {
+      ignoreReturnCode: true,
+      silent: true
+    }).then(res => {
+      if (res.stderr.length > 0 && res.exitCode != 0) {
+        throw new Error(res.stderr.trim());
+      }
+      return res.stdout;
+    });
+  }
+
   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,