[kaahos]

What does this PR do?:
Fixes candidate discovery in utils/prepare-patch.sh. Adds regression coverage and documents the test command.

Motivation:
Patch preparation reported “No commits on main ahead” even when backport candidates existed. IFS= made read consume the entire + <SHA> line as the sign, so every candidate was discarded. Splitting on spaces restores detection and preserves exclusion of equivalent backports.

Additional Notes:
Agentic review: passed — Codex reviewed the full committed change against origin/main and found no actionable regressions.
Live backport and release execution: inconclusive — not exercised.

How to test the change?:

• bash utils/tests/test_prepare_patch.sh: four cases covering equal branches, two pending PRs, a partial backport, and a complete backport.

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a security review (run the dd:platform-security-review
  skill, or file a request via the PSEC review form).
  bewaire also runs automatically on every PR.
• This PR doesn't touch any of that.
• JIRA: N/A — no tracker ticket supplied, per author.

Unsure? Have a question? Request a review!

[kaahos]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-26T13:28:05.339446Z	9245fbe	Manual request

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• Mark a draft as ready
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Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

Reviewed commit: 9245fbec8c

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[datadog-datadog-prod-us1-2]

More details

Space-delimited parsing restores discovery of pending commits while preserving exclusion of patch-equivalent backports. The completed static review and local Git regression coverage support both behaviors.

Was this helpful? React 👍 or 👎

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_{🤖 Bits Code Review · Commit 9245fbe}

[dd-octo-sts]

CI Test Results

Run: #40330238935 | Commit: b6da486 | Duration: 21m 32s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	✅	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 32 | Failed: 0

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Updated: 2026-10-26 13:48:40 UTC