aws cdk synth results in NEW folder under /tmp every time a command is run, which results to 100% disk space usage over time

[piotrwalczak1]

Describe the bug

I am using WSL 2 with Ubuntu distro. Every time I run cdk synth, the cdk.out file is saved in /tmp folder. Over time, the user is surprised that he has no space left on the disk. Investigation of this took hours, and finally it occurred that cdk synth saving files to /tmp is the issue.

Expected Behavior

I guess this should have some limit at least if it really do need to save it there.

Current Behavior

Out of disk space over time

Reproduction Steps

Have a project. Run cdk synth 1000 times.

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.128.0

Framework Version

No response

Node.js Version

20.x

OS

Ubuntu WSL 2

Language

TypeScript

Language Version

5.1.6

Other information

No response

[nmussy]

Would you be able to give us a minimal reproduction application? I am able to get something similar to what you're describing, but only if my stack contains a CustomResources, e.g. BucketDeployment:

$ cdk synth
$ ls -t $TMPDIR | head
cdk-custom-resourceav715a
cdk-custom-resourcenjXTtG

aws-cdk/packages/aws-cdk-lib/core/lib/custom-resource-provider/custom-resource-provider-base.ts

Lines 232 to 233 in 2378635

	const stagingDirectory = FileSystem.mkdtemp('cdk-custom-resource');
	fs.copySync(props.codeDirectory, stagingDirectory, { filter: (src, _dest) => !src.endsWith('.ts') });

[pahud]

yes please share some code snippet. The cdk.out should be created in your cdk project root unless you specify -o to /tmp.

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