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fix(cfnspec): incorrectly handling array result from jsondiff (backport #23795) #23800

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merged 1 commit into from
Jan 24, 2023

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@mergify mergify bot commented Jan 23, 2023

This is an automatic backport of pull request #23795 done by Mergify.


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We are getting an error when updating the cfnspec:

```bash
Error: Unexpected array diff entry: [" "]
```

We are using `json-diff` to calculate diff entries, and expect that each entry is a 2-tuple array. Indeed, the [docs](https://github.com/andreyvit/json-diff#arrays) say this. Turns out, this is only true when supplying the `--full` option.
With `--full`, the output for equivalent entries is `[' ', 1]`. Without `--full`, the output for equivalent entries is `[' ']`.

I considered that this might be a bug/breaking change in `json-diff`, but I did some spelunking and this is behavior that is codified in tests that haven't been changed in 11 years:  https://github.com/andreyvit/json-diff/blob/35582a9d19f8b0b2773360d67937e57ce2866781/test/diff_test.coffee#L78

More likely, we were relying on an implicit default to `--full` that is now turned off, or we have never come across such an issue before (which feels unlikely). I don't think we actually want `--full`, because we want the difference and that's it. So I've instead handled this case that should be a one-off case.

I have run the update on my own machine and confirm it works as expected, and the output in `CHANGELOG.md` is correct.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

(cherry picked from commit 4a701f1)
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@aws-cdk-automation aws-cdk-automation requested a review from a team January 23, 2023 23:27
@github-actions github-actions bot added the p2 label Jan 23, 2023
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  • CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
  • Commit ID: b1b8fb7
  • Result: SUCCEEDED
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@TheRealAmazonKendra TheRealAmazonKendra added pr-linter/exempt-test The PR linter will not require test changes pr-linter/exempt-integ-test The PR linter will not require integ test changes labels Jan 24, 2023
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mergify bot commented Jan 24, 2023

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

@mergify mergify bot merged commit ee911ec into v1-main Jan 24, 2023
@mergify mergify bot deleted the mergify/bp/v1-main/pr-23795 branch January 24, 2023 04:54
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3 participants