fix(core): bundling with staging disabled returns a relative path

The change introduced in aws#9576 did not handle the "staging disabled"
case. As a consequence, when bundling the staged path was always
relative.

Revert to the behavior that was present before this change: when staging
is disabled the staged path is absolute (whether bundling or not).

Closes aws#10367

packages/@aws-cdk/core/lib/asset-staging.ts

@@ -120,14 +120,14 @@ export class AssetStaging extends Construct {
       }
     } else {
       this.assetHash = this.calculateHash(hashType, props.assetHash);
+      this.relativePath = renderAssetFilename(this.assetHash, path.extname(this.sourcePath));
+      this.stagedPath = this.relativePath;
+    }
 
-      const stagingDisabled = this.node.tryGetContext(cxapi.DISABLE_ASSET_STAGING_CONTEXT);
-      if (stagingDisabled) {
-        this.stagedPath = this.sourcePath;
-      } else {
-        this.relativePath = renderAssetFilename(this.assetHash, path.extname(this.sourcePath));
-        this.stagedPath = this.relativePath;
-      }
+    const stagingDisabled = this.node.tryGetContext(cxapi.DISABLE_ASSET_STAGING_CONTEXT);
+    if (stagingDisabled) {
+      this.relativePath = undefined;
+      this.stagedPath = this.bundleDir ?? this.sourcePath;
     }
 
     this.sourceHash = this.assetHash;

packages/@aws-cdk/core/test/test.staging.ts

@@ -144,11 +144,11 @@ export = {
     // GIVEN
     const app = new App();
     const stack = new Stack(app, 'stack');
-    stack.node.setContext(cxapi.DISABLE_ASSET_STAGING_CONTEXT, true);
+    stack.node.setContext(cxapi.DISABLE_ASSET_STAGING_CONTEXT, false);
     const directory = path.join(__dirname, 'fs', 'fixtures', 'test1');
 
     // WHEN
-    new AssetStaging(stack, 'Asset', {
+    const asset = new AssetStaging(stack, 'Asset', {
       sourcePath: directory,
       bundling: {
         image: BundlingDockerImage.fromRegistry('alpine'),
@@ -167,6 +167,14 @@ export = {
       'tree.json',
     ]);
 
+    test.equal(asset.sourceHash, 'b1e32e86b3523f2fa512eb99180ee2975a50a4439e63e8badd153f2a68d61aa4');
+    test.equal(asset.sourcePath, directory);
+
+    const resolvedStagePath = stack.resolve(asset.stagedPath);
+    // absolute path ending with bundling dir
+    test.ok(path.isAbsolute(resolvedStagePath));
+    test.ok(new RegExp('asset.b1e32e86b3523f2fa512eb99180ee2975a50a4439e63e8badd153f2a68d61aa4$').test(resolvedStagePath));
+
     test.done();
   },