(core): Normalize hashing algorithm between different OSs

The Question

How can I have the same asset hash when building the stack from different OS? I’m very reluctant to implement a custom hash for the source content but the snapshot test we have will fail when run in the CI container since the snapshot was created on Windows.

Environment

• CDK CLI Version: 1.100.0
• Module Version: 1.100.0
• Node.js Version: v14.16.0
• OS: Windows 10 Pro 19042.928
• Language (Version): ~3.9.7

Other information

For example I have a PythonFunction as belows

new PythonFunction(this, 'TaskMonitoringLambda', {
    entry: path.join(__dirname, '..', 'lambda'),
    index: 'failed_task_notification.py',
    handler: 'push',
    runtime: Runtime.PYTHON_3_7,
    retryAttempts: this.node.tryGetContext('max_retries'),
    memorySize: 128,
    functionName: `${machineID}TaskMonitoringLambda`,
    assetHashType: AssetHashType.SOURCE, // see https://github.com/aws/aws-cdk/pull/12984
    environment: {
        'FAILED_TASK_TOPIC': failedTaskTopic.topicArn,
        'REGION': this.node.tryGetContext('region'),
        'ENV': env
    }
})

and the asset hash for this is stable between repeated builds in Windows, despite cleaning out the caches and docker images etc… However the hash produced in Centos container is different.

[jogold]

Hi @peterwoodworth, not yet. I should have time to address this before the end of August.

[mlippens]

We have the same issue with function resources NodejsFunction and PythonFunction.