Synthesis fails with the error ENAMETOOLONG

[otaviomacedo]

Describe the bug

For some templates, the synthesis fails with the error ENAMETOOLONG.

Expected behavior

Synthesize the template successfully.

Current behavior

Running decdk on some templates leads to the error:

Error: ENAMETOOLONG: name too long, mkdir '/Users/otaviom/projects/decdk/examples/cdk.out/asset.5205744804b6ed271bb4809a866fc56a2c53383a68ce2919e707afc0730cd523/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628/cdk.out/asset.15689ac064b611030f942500c2748f742e64ae1901db7bec75f6fbcb5924f628'

It seems it's producing a symlink that points to the directory that contains it.

Reproduction steps

Run cdk -a "decdk lambda-topic.json" synth on the examples folder of this repo.

[mrgrain]

Currently failing with this error:

examples/apigw.json
examples/lambda-events.json
examples/lambda-role-removed.json
examples/lambda-topic.json

All are using "fromAsset": { "path": "." }

[mrgrain]

Reproduced with classic CDK. Error messages is basically the same an equally unusable.

new lambda.Function(this, "Function", {
  runtime: lambda.Runtime.NODEJS_16_X,
  handler: "lambda.handler",
  code: Code.fromAsset("."),
});

I don't think this is producing a symlink, but rather an issue with the recursive implementation of copyDirectory algorithm. The . path will include cdk.out, which we are also copying files to. So any file that is copied to the asset is immediately discovered as a new file that needs copying.

[mrgrain]

Related aws-cdk issue aws/aws-cdk#3899