fix(s3-assets): cannot publish a file without extension

packages/@aws-cdk-testing/framework-integ/test/aws-s3-assets/test/integ.assets.file-bundling.lit.ts

@@ -26,6 +26,17 @@ class TestStack extends Stack {
 
     const user = new iam.User(this, 'MyUser');
     asset.grantRead(user);
+
+    new assets.Asset(this, 'BundledAssetWithoutExtension', {
+      path: path.join(__dirname, 'markdown-asset'),
+      bundling: {
+        image: DockerImage.fromBuild(path.join(__dirname, 'alpine-markdown')),
+        outputType: BundlingOutput.SINGLE_FILE,
+        command: [
+          'sh', '-c', 'echo 123 > /asset-output/main',
+        ],
+      },
+    });
   }
 }
 

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

@@ -278,9 +278,10 @@ export class AssetStaging extends Construct {
    */
   private stageByCopying(): StagedAsset {
     const assetHash = this.calculateHash(this.hashType);
-    const stagedPath = this.stagingDisabled
+    const targetPath = this.stagingDisabled
       ? this.sourcePath
       : path.resolve(this.assetOutdir, renderAssetFilename(assetHash, getExtension(this.sourcePath)));
+    const stagedPath = this.renderStagedPath(this.sourcePath, targetPath);
 
     if (!this.sourceStats.isDirectory() && !this.sourceStats.isFile()) {
       throw new Error(`Asset ${this.sourcePath} is expected to be either a directory or a regular file`);
@@ -338,7 +339,10 @@ export class AssetStaging extends Construct {
     // Calculate assetHash afterwards if we still must
     assetHash = assetHash ?? this.calculateHash(this.hashType, bundling, bundledAsset.path);
 
-    const stagedPath = path.resolve(this.assetOutdir, renderAssetFilename(assetHash, bundledAsset.extension));
+    const stagedPath = this.renderStagedPath(
+      bundledAsset.path,
+      path.resolve(this.assetOutdir, renderAssetFilename(assetHash, bundledAsset.extension)),
+    );
 
     this.stageAsset(bundledAsset.path, stagedPath, 'move');
 
@@ -388,7 +392,7 @@ export class AssetStaging extends Construct {
     }
 
     // Moving can be done quickly
-    if (style == 'move') {
+    if (style === 'move') {
       fs.renameSync(sourcePath, targetPath);
       return;
     }
@@ -511,6 +515,15 @@ export class AssetStaging extends Construct {
         throw new Error('Unknown asset hash type.');
     }
   }
+
+  private renderStagedPath(sourcePath: string, targetPath: string): string {
+    // Add a suffix to the asset file name
+    // because when a file without extension is specified, the source directory name is the same as the staged asset file name.
+    if (this.hashType === AssetHashType.SOURCE && path.dirname(sourcePath) === targetPath) {
+      targetPath = targetPath + 'noext';
+    }
+    return targetPath;
+  }
 }
 
 function renderAssetFilename(assetHash: string, extension = '') {

packages/aws-cdk-lib/core/lib/stack-synthesizers/asset-manifest-builder.ts

@@ -24,6 +24,9 @@ export class AssetManifestBuilder {
   public defaultAddFileAsset(stack: Stack, asset: FileAssetSource, target: AssetManifestFileDestination) {
     validateFileAssetSource(asset);
 
+    // If the fileName begins with 'asset.', remove it here
+    // because when a file without extension is added to the manifest, the path.extension() will return an file hash.
+    // ex) path.extension('asset.dc5ce447844') => 'dc5ce447844'
     const extension =
       asset.fileName != undefined ? path.extname(asset.fileName) : '';
     const objectKey =

packages/aws-cdk-lib/core/test/docker-stub-cp.sh

@@ -6,6 +6,17 @@ set -euo pipefail
 echo "$@" >> /tmp/docker-stub-cp.input.concat
 echo "$@" > /tmp/docker-stub-cp.input
 
+# create a file without extension to emulate created files, fetch the target path from the "docker cp" command
+if cat /tmp/docker-stub-cp.input.concat | grep "DOCKER_STUB_SINGLE_FILE_WITHOUT_EXT"; then
+  if echo "$@" | grep "cp"| grep "/asset-output"; then
+    outdir=$(echo "$@" | grep cp | grep "/asset-output" | xargs -n1 | grep "cdk.out" | head -n1 | cut -d":" -f1)
+    if [ -n  "$outdir" ]; then
+      touch "${outdir}/test" # create a file witout extension
+      exit 0
+    fi
+  fi
+fi
+
 # create a fake zip to emulate created files, fetch the target path from the "docker cp" command
 if echo "$@" | grep "cp"| grep "/asset-output"; then
   outdir=$(echo "$@" | grep cp | grep "/asset-output" | xargs -n1 | grep "cdk.out" | head -n1 | cut -d":" -f1)

packages/aws-cdk-lib/core/test/docker-stub.sh

@@ -37,6 +37,12 @@ if echo "$@" | grep "DOCKER_STUB_SINGLE_ARCHIVE"; then
   exit 0
 fi
 
+if echo "$@" | grep "DOCKER_STUB_SINGLE_FILE_WITHOUT_EXT"; then
+  outdir=$(echo "$@" | xargs -n1 | grep "/asset-output" | head -n1 | cut -d":" -f1)
+  touch ${outdir}/test # create a file witout extension
+  exit 0
+fi
+
 if echo "$@" | grep "DOCKER_STUB_SINGLE_FILE"; then
   outdir=$(echo "$@" | xargs -n1 | grep "/asset-output" | head -n1 | cut -d":" -f1)
   touch ${outdir}/test.txt

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

@@ -20,6 +20,7 @@ enum DockerStubCommand {
   MULTIPLE_FILES = 'DOCKER_STUB_MULTIPLE_FILES',
   SINGLE_ARCHIVE = 'DOCKER_STUB_SINGLE_ARCHIVE',
   SINGLE_FILE = 'DOCKER_STUB_SINGLE_FILE',
+  SINGLE_FILE_WITHOUT_EXT = 'DOCKER_STUB_SINGLE_FILE_WITHOUT_EXT',
   VOLUME_SINGLE_ARCHIVE = 'DOCKER_STUB_VOLUME_SINGLE_ARCHIVE',
 }
 
@@ -1450,6 +1451,36 @@ describe('staging', () => {
     expect(staging.isArchive).toEqual(false);
   });
 
+  test('bundling that produces a single file with SINGLE_FILE_WITHOUT_EXT and hash type SOURCE', () => {
+    // GIVEN
+    const app = new App({ context: { [cxapi.NEW_STYLE_STACK_SYNTHESIS_CONTEXT]: false } });
+    const stack = new Stack(app, 'stack');
+    const directory = path.join(__dirname, 'fs', 'fixtures', 'test1');
+
+    // WHEN
+    const staging = new AssetStaging(stack, 'Asset', {
+      sourcePath: directory,
+      bundling: {
+        image: DockerImage.fromRegistry('alpine'),
+        command: [DockerStubCommand.SINGLE_FILE_WITHOUT_EXT],
+        outputType: BundlingOutput.SINGLE_FILE,
+      },
+      assetHashType: AssetHashType.SOURCE, // default
+    });
+
+    // THEN
+    const assembly = app.synth();
+    expect(fs.readdirSync(assembly.directory)).toEqual([
+      'asset.ef734136dc22840a94140575a2f98cbc061074e09535589d1cd2c11a4ac2fd75',
+      'asset.ef734136dc22840a94140575a2f98cbc061074e09535589d1cd2c11a4ac2fd75noext',
+      'cdk.out',
+      'manifest.json',
+      'stack.template.json',
+      'tree.json',
+    ]);
+    expect(staging.packaging).toEqual(FileAssetPackaging.FILE);
+    expect(staging.isArchive).toEqual(false);
+  });
 });
 
 describe('staging with docker cp', () => {
@@ -1517,6 +1548,38 @@ describe('staging with docker cp', () => {
       expect.stringContaining('volume rm assetOutput'),
     ]));
   });
+
+  test('bundling that produces a single file with docker image copy variant', () => {
+    // GIVEN
+    const app = new App({ context: { [cxapi.NEW_STYLE_STACK_SYNTHESIS_CONTEXT]: false } });
+    const stack = new Stack(app, 'stack');
+    const directory = path.join(__dirname, 'fs', 'fixtures', 'test1');
+
+    // WHEN
+    const staging = new AssetStaging(stack, 'Asset', {
+      sourcePath: directory,
+      bundling: {
+        image: DockerImage.fromRegistry('alpine'),
+        command: [DockerStubCommand.SINGLE_FILE_WITHOUT_EXT],
+        outputType: BundlingOutput.SINGLE_FILE,
+        bundlingFileAccess: BundlingFileAccess.VOLUME_COPY,
+      },
+      assetHashType: AssetHashType.SOURCE, // default
+    });
+
+    // THEN
+    const assembly = app.synth();
+    expect(fs.readdirSync(assembly.directory)).toEqual([
+      'asset.93bd4079bff7440a725991ecf249416ae9ad73cb639f4a8d9e8f3ad8d491e89f',
+      'asset.93bd4079bff7440a725991ecf249416ae9ad73cb639f4a8d9e8f3ad8d491e89fnoext',
+      'cdk.out',
+      'manifest.json',
+      'stack.template.json',
+      'tree.json',
+    ]);
+    expect(staging.packaging).toEqual(FileAssetPackaging.FILE);
+    expect(staging.isArchive).toEqual(false);
+  });
 });
 
 // Reads a docker stub and cleans the volume paths out of the stub.