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fix(scan): bind committed diffs to reviewed snapshot contents - #449

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mdangelo/codex/content-bound-diff-snapshots
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fix(scan): bind committed diffs to reviewed snapshot contents#449
mldangelo-oai wants to merge 7 commits into
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mdangelo/codex/content-bound-diff-snapshots

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@mldangelo-oai

@mldangelo-oai mldangelo-oai commented Aug 15, 2026

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Summary

Allow committed-diff scans to finish and bind their saved manifests to the actual Git diff selected for review.

Fixes #299. Supersedes #241 and #373.

Changes

  • Compute committed-diff snapshot digests from canonical raw change metadata and the actual contents of every changed Git blob instead of only the selected commit identifiers.
  • Keep snapshots independent of Git rendering preferences, working-tree attributes, global attributes, repository-local info/attributes, and named diff-driver configuration.
  • Use Git 2.39-compatible git diff --raw and git cat-file --batch plumbing, including the Git version installed in the customer container.
  • Stream changed-object data through temporary files inside the approved workbench state directory and hash it in chunks without adding arbitrary input-size limits, buffering repository contents in memory, or writing repository data outside the permitted workspace.
  • Preserve the selected digest in workbench setup, direct CLI registration, completed scan manifests, and manifest verification.
  • Reject changes made between selection and scan startup, revalidate immediately before workspace, prompt-driven, and CLI scan registration, and preserve the original snapshot with an explicit warning when replacement objects change the reviewed diff during a scan.
  • Select the correct empty tree for root commits in both SHA-1 and SHA-256 Git repositories.
  • Cover the compact MCP lifecycle, direct CLI finalization, replaced commit and blob contents, startup races during workspace and CLI registration, completion drift warnings, mutable attribute sources and diff drivers, older Git compatibility, streaming equivalence, restricted temporary-file permissions, and both supported repository object formats.

Testing

  • bun test --timeout 30000 --only-failures --test-name-pattern 'committed diff|committed snapshots|compact MCP diff lifecycle|root commits|without newer Git attribute-source options' tests-ts/scan-recovery.test.ts tests-ts/compact-diff-scan.test.ts — 15 passed, 0 failed.
  • Combined this branch with fix(windows): parse native tar listings by line #436, fix(runtime): support reviewed scan approval defaults #441, and fix(runtime): recover malformed credential-home lock owners #448, then ran bun test --timeout 30000 --only-failures --randomize --seed 12345 ./tests-ts — 1,157 passed, 11 skipped, 0 failed.
  • Exact-head Linux, macOS, and Windows GitHub CI matrices passed.
  • pnpm run types
  • pnpm run format
  • pnpm run build
  • pnpm pack --pack-destination /private/tmp/codex-security-next-patch-package-20260815
  • Installed-package smoke validation of the combined release candidate through node scripts/check-package.mjs: public import, CLI, 106 bundled plugin files, a nested worker, and all 202 archive entries passed.

Risk and rollout

Committed diff targets gain the already-required snapshot digest and use the same length-framed snapshot format as working-tree targets. Existing scans that do not have a committed-diff digest keep their prior warning behavior. Raw Git metadata and exact blob contents are streamed inside the already-approved workbench state directory without introducing an artificial size limit or copying repository data outside the writable workspace. Formatting, attribute, and diff-driver changes do not affect the digest, and all commands remain compatible with Git 2.39. Replacement-object changes are rejected before scan startup and reported without overwriting the original snapshot after startup.

Public disclosure review

  • No customer, partner, prospect, or user identities, data, or identifying details are included.
  • No credentials, personal data, private source, scan findings, or nonpublic links or tickets are included.
  • I reviewed the branch name, title, description, commits, changes, comments, logs, screenshots, attachments, and links for public disclosure.

@github-actions github-actions Bot added the bug Something isn't working label Aug 15, 2026
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💡 Codex Review

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Reviewed commit: 67bb3a74f6

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Comment thread sdk/typescript/_bundled_plugin/scripts/workbench_target.py
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Security review completed. No security issues were found in this pull request.

Reviewed commit: 67bb3a74f6

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Security review completed. No security issues were found in this pull request.

Reviewed commit: 3123c57519

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ℹ️ About Codex security reviews in GitHub

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💡 Codex Review

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Reviewed commit: 3123c57519

ℹ️ About Codex in GitHub

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

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Comment thread sdk/typescript/_bundled_plugin/scripts/workbench_db.py
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Security review completed. No security issues were found in this pull request.

Reviewed commit: 6f3765335b

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ℹ️ About Codex security reviews in GitHub

This is an experimental Codex feature. Security reviews are triggered when:

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Security review completed. No security issues were found in this pull request.

Reviewed commit: 6f3765335b

View security finding report

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ℹ️ About Codex security reviews in GitHub

This is an experimental Codex feature. Security reviews are triggered when:

  • You comment "@codex security review"
  • A regular code review gets triggered (for example, "@codex review" or when a PR is opened), and you’re opted in so security review runs alongside code review

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💡 Codex Review

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Reviewed commit: 6f3765335b

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

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Comment thread sdk/typescript/_bundled_plugin/scripts/workbench_target.py Outdated
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Security review completed. No security issues were found in this pull request.

Reviewed commit: 56b3ae48fa

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ℹ️ About Codex security reviews in GitHub

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  • A regular code review gets triggered (for example, "@codex review" or when a PR is opened), and you’re opted in so security review runs alongside code review

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Reviewed commit: 56b3ae48fa

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Comment thread sdk/typescript/_bundled_plugin/scripts/workbench_target.py Outdated
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Security review completed. No security issues were found in this pull request.

Reviewed commit: 60aedf013f

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💡 Codex Review

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Reviewed commit: 60aedf013f

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Security review completed. No security issues were found in this pull request.

Reviewed commit: 1c11bfe7ac

View security finding report

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ℹ️ About Codex security reviews in GitHub

This is an experimental Codex feature. Security reviews are triggered when:

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  • A regular code review gets triggered (for example, "@codex review" or when a PR is opened), and you’re opted in so security review runs alongside code review

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💡 Codex Review

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Reviewed commit: 1c11bfe7ac

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
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  • Comment "@codex review".

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

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Comment thread sdk/typescript/_bundled_plugin/scripts/workbench_target.py Outdated
Comment thread sdk/typescript/_bundled_plugin/scripts/workbench_target.py Outdated
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Codex Review: Didn't find any major issues. Can't wait for the next one!

Reviewed commit: b5ef12a59a

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".

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Security review completed. No security issues were found in this pull request.

Reviewed commit: b5ef12a59a

View security finding report

Only the user who started this review can view the report in Codex.

ℹ️ About Codex security reviews in GitHub

This is an experimental Codex feature. Security reviews are triggered when:

  • You comment "@codex security review"
  • A regular code review gets triggered (for example, "@codex review" or when a PR is opened), and you’re opted in so security review runs alongside code review

Once complete, Codex will leave suggestions, or a comment if no findings are found.

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scan --diff always fails to save: scan.target.snapshotDigest: expected a non-empty string

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