CLI: report cdk bootstrap versions

[mrgum]

Describe the feature

I would like cdk options that reports the versions of the bootstrap template that comes with the installed cdk and the version currently deployed

Use Case

I would like to check and report if a bootstrap is up to date, without running a cdk deploy or bootstrap

Proposed Solution

cdk current version can be got from cdk bootstrap --show-template | yq '.Resources.CdkBootstrapVersion.Properties.Value'
cdk currently deployed version can be got from the ssm parameter /cdk-bootstrap/hnb659fds/version

cdk bootstrap --show-bootstrap-versions might show
latest-bootstrap: 25
deployed-bootstrap: 21
cdk bootstrap --show-bootstrap-latest-version might show
latest-bootstrap: 25
cdk bootstrap --show-bootstrap-deployed-version might show
deployed-bootstrap: 21
cdk bootstrap --is-bootstrap-up-to-date might show true/false

Other Information

If the options could support the --json and --yaml flags to give better programatic use, all the better

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.171.1 (build a95560c)

Environment details (OS name and version, etc.)

macos 15.1.1

[khushail]

Hi @mrgum , thanks for requesting this. I see using the cdk bootstrap --show-template , you can see the latest template and the compare with the one which is deployed , but there is no such feature to specifically see the versions so your FR might be a good option to quickly see the updates.
Since this is a good-to-have feature, I am marking this as P3 to welcome contributions outside CDK Team.
Thanks for volunteering for contribution. Looking forward to it.