Reject incomplete package streams in Crossplane Runtime parser (#1151)

[JbravoI]

Description of your changes

This updates the package parser to preserve source annotations when the package stream returns a non-EOF read error, ensuring incomplete reads are rejected with useful context.

Fixes #1151 and #7817 in crossplain ( crossplane/crossplane#7830 )

I have:

• Read and followed Crossplane's contribution process.
• Run ./nix.sh flake check to ensure this PR is ready for review.
• Added or updated unit tests.
• Linked a PR or a docs tracking issue to document this change.
• Added backport release-x.y labels to auto-backport this PR.

Focused test passed:

go test ./pkg/xpkg/parser -run TestParserRejectsIncompleteDocument -count=1

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Reviewing files that changed from the base of the PR and between 8c7e903 and 1cc600f.

📒 Files selected for processing (1)

• pkg/xpkg/parser/parser_test.go

🚧 Files skipped from review as they are similar to previous changes (1)

• pkg/xpkg/parser/parser_test.go

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📝 Walkthrough

Walkthrough

Parse now annotates non-EOF errors from yr.Read(). Regression tests verify error causes and source annotations for incomplete package streams.

Changes

Parser completeness validation

Layer / File(s)	Summary
Read error annotation and incomplete input tests pkg/xpkg/parser/parser.go, pkg/xpkg/parser/parser_test.go	Parse passes non-EOF read errors through annotateErr. Tests add annotated reader coverage, compare wrapped causes and full error strings, and support instance-specific read errors.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 1cc60

The parser regression coverage change has no identified merge-blocking risk.

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Important

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

❌ Failed checks (1 error, 1 warning)

Check name	Status	Explanation	Resolution
Breaking Changes	❌ Error	The pull request changes the behavior of the exported (*PackageParser).Parse method. In the base revision, a non-EOF error from yr.Read() is returned directly at pkg/xpkg/parser/parser.go:118; t…	Add the breaking-change label to the pull request. If the behavior must remain non-breaking, return the original read error for existing callers instead of adding the annotation wrapper.
Linked Issues check	⚠️ Warning	The changes satisfy part of #1151. Parse now passes non-EOF yr.Read() errors to annotateErr, and TestParserRejectsIncompleteDocument covers malformed YAML and an annotated unexpected end-of-st…	Add parser regression cases for valid MRD documents that remove an API version and omit optional fields. Assert that Parse returns no error and preserves the expected parsed resources. Keep the incomplete-stream and annotation assertions.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Out of Scope Changes check	✅ Passed	The one-line parser change preserves source annotations for read errors. The added test helper and regression test exercise incomplete package streams. These changes directly support #1151 and the rel…
Title check	✅ Passed	The title is 70 characters, stays under the 72-character limit, and clearly describes rejecting incomplete package streams in the parser.
Description check	✅ Passed	The description directly explains the parser error-propagation change, source annotation preservation, regression tests, and related objectives.

Full details: Linked Issues check

Explanation

The changes satisfy part of #1151. Parse now passes non-EOF yr.Read() errors to annotateErr, and TestParserRejectsIncompleteDocument covers malformed YAML and an annotated unexpected end-of-stream error. The existing TestParser covers a complete stream. The reviewed parser tests do not cover intentional MRD version removal or omission of optional MRD fields, which #1151 requires to remain valid and which supports the related truncation regression in #7817.

Full details: Breaking Changes

Explanation

The pull request changes the behavior of the exported (*PackageParser).Parse method. In the base revision, a non-EOF error from yr.Read() is returned directly at pkg/xpkg/parser/parser.go:118; the head revision passes it to annotateErr. For any public AnnotatedReadCloser, annotateErr wraps the error with the annotation. The repository's errors.Wrapf changes the top-level error value and Error() text while preserving Unwrap, so callers that compare the returned error directly, inspect its concrete top-level type, or depend on its exact text can break. This path is reachable through the public NewFsReadCloser and FsBackend APIs. The supplied pull request material does not declare the required breaking-change label.

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Actionable comments posted: 1

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Inline comments:
In `@pkg/xpkg/parser/parser_test.go`:
- Around line 241-244: Update the table-driven parser test around Parse to
define args, want, and reason fields, use a reader implementing
AnnotatedReadCloser, and assert the expected annotated read error with cmp.Diff
and cmpopts.EquateErrors(). Verify the annotation is present rather than only
checking that err is non-nil, while preserving the existing error-read scenario.

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: 240e8e97-e87c-4711-8910-b44e1ac1305e

📥 Commits

Reviewing files that changed from the base of the PR and between 5b9c969 and 8c7e903.

📒 Files selected for processing (2)

• pkg/xpkg/parser/parser.go
• pkg/xpkg/parser/parser_test.go

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

[JbravoI]

Hi @haarchri , I’ve addressed the parser review feedback in this commit:

• Added an AnnotatedReadCloser test.
• Asserted the wrapped read error with cmpopts.EquateErrors().
• Verified the source annotation is preserved in the returned error.

The focused parser test passes. Could you please re-review and approve PR #1152? It is currently blocking the related Crossplane PR.

Also could a maintainer please add the breaking-change label to this PR? The review check requires it before merge. The annotated-reader regression has already been added in commit 9dc2cea.