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fix(nextjs): preserve absolute Windows standalone links safely - #272
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Summary by CodeRabbit
WalkthroughNext.js standalone assembly now stages absolute symlinks whose targets remain inside the tracing root. It copies target payloads, rewrites symlinks to relative in-bundle paths, preserves occupied bundle paths, and adds staged sources to bundle watch paths. Assembly rejects dangling, nested out-of-root, and external absolute symlinks. Integration tests and documentation cover these behaviors. A Windows workflow builds, deploys, verifies, and cleans up a diagnostic Next.js project. Priority: ⬇️ Low Merge Risk: 🟠 High · up to A same-repository branch author could expose the deployment credential, so the credential boundary should be protected before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files. (3 skipped: 3 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
✨ Simplify code
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Inline comments:
In `@packages/0-framework/2-authoring/nextjs/src/control/build.ts`:
- Line 174: Update the build logic around lstatIfPresent(target) so existing
bundle paths cannot shadow absolute-link targets: stage sourceReal in a
collision-free directory and rewrite the link to that staged location. Add a
regression test covering an occupied mapped target path containing different
content, verifying the rewritten link still resolves to the original target.
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packages/0-framework/2-authoring/nextjs/src/__tests__/assemble.test.tspackages/0-framework/2-authoring/nextjs/src/control/build.ts
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Inline comments:
In `@packages/0-framework/2-authoring/nextjs/src/control/build.ts`:
- Line 194: Update the staging flow around fs.promises.cp to preserve or rewrite
nested relative symlink targets so they resolve to the corresponding staged
traced siblings rather than dangling after relocation; ensure
assertBundleSymlinksStayInside and missingLinkTargets handle an absolute
directory link containing a relative link to a traced sibling, and add a
regression test covering that scenario.
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✅ Gizmo reviewed c48ba83 — posted 2 inline comment(s) this pass. Open findings: 🟡 2 minor Change walkthroughThis PR fixes assembly of Next.js standalone output on Windows, where Core change — build.ts gains Tests — assemble.test.ts adds five cases: absolute-link rewriting, a relative sibling link inside a staged target, rejection of an external nested link even against a would-be colliding bundle path, non-shadowing of occupied bundle paths, and out-of-root rejection. The existing Windows junction test is extended with an absolute traced-package junction and asserts only junction-type symlinks are created. Docs — deploying.md and the core-concepts skill document the new staging rule and its boundaries, consistent with the implementation. |
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Inline comments:
In @.github/workflows/windows-current-cli-diagnostic.yml:
- Line 12: Update the workflow condition guarding the credential-bearing job so
pull requests cannot execute modified deployment or cleanup code with
PRISMA_SERVICE_TOKEN; require an approval-protected environment with required
reviewers before the job runs, or restrict credentialed execution to post-merge
runs from a protected branch.
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New findings: 🟡 2 minor · trace
Still open from previous reviews: 🟠 1 major · 🟡 1 minor
Findings outside the diff
- 🟡 Minor · consistency .github/workflows/windows-current-cli-diagnostic.yml — PR description says the diagnostic workflow was removed and "no new workflow remains", but it is present and modified at HEAD
The description states "The Windows diagnostic workflow was temporary and is not part of this PR" and "Removed the temporary diagnostic workflow and script after recording results. No new workflow remains." Yet this PR re-adds the workflow (commit 781e938) and the head commit (c161ac0) modifies it, so merging ships a diagnostic that consumesPRISMA_SERVICE_TOKEN, deploys real services on windows-latest, and self-triggers on every future edit to the file (on: pull_request: paths: [.github/workflows/windows-current-cli-diagnostic.yml]). Either delete the workflow (and the head commit's changes to it) before merge, or update the description to state the workflow intentionally ships.
Recommended fix: Delete.github/workflows/windows-current-cli-diagnostic.ymlbefore merging (matching the stated intent), or amend the PR description to acknowledge the workflow remains in the PR.
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New findings: 🟡 2 minor · trace
Still open from previous reviews: 🟠 1 major · 🟡 2 minor
Findings outside the diff
- 🟡 Minor · consistency .github/workflows/windows-current-cli-diagnostic.yml — Temporary diagnostic workflow still present despite PR description claiming it was removed
The PR description states "Removed the temporary diagnostic workflow and script after recording results. No new workflow remains" and that the diagnostic "is not part of this PR". The file is nonetheless present and modified at head (re-added in 781e938 after the earlier deliberate removal in 01803db, then modified through 4737bc5). Merging as-is ships a temporary diagnostic that provisions and deploys real projects with PRISMA_SERVICE_TOKEN on any PR that touches this file, contradicting the stated intent and re-creating what was already cleaned up once. Delete the file (and its paths-filter trigger) before merge, or amend the description to say it intentionally remains.
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@coderabbitai review Current head is updated to main. All review threads are addressed, and the temporary diagnostic workflows are absent from the final diff. Please re-review the current implementation; the previous changes-requested reviews still block merging. |
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✅ Action performedReview finished.
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@coderabbitai full review Please review the complete current diff at 6550212. Incremental review left the prior changes-requested review in place. The temporary diagnostic workflows are absent, all previous findings are addressed, and this branch is updated to current main. |
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@prisma-gizmo Could you re-review current head 6550212? The changes-requested review is on 00f2057 and refers to the temporary diagnostic workflow, which is now removed. All review threads are resolved; the final diff contains only Next.js assembly, regression tests, and documentation. Please reassess the current code and update the review if appropriate. |
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Signed-off-by: Aman Varshney <amanvarshney.work@gmail.com> (cherry picked from commit ac9d533)
Signed-off-by: Aman Varshney <amanvarshney.work@gmail.com> (cherry picked from commit eab26b4)
Signed-off-by: Aman Varshney <amanvarshney.work@gmail.com> (cherry picked from commit 9c93871)
Signed-off-by: Aman Varshney <amanvarshney.work@gmail.com> (cherry picked from commit d5bba3e)
Signed-off-by: Aman Varshney <amanvarshney.work@gmail.com>
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@prisma-gizmo Could you re-review current head c48ba83? This PR is now stacked on #305 at 01facf3. The temporary diagnostic workflows are absent, all inline threads are resolved, and the clean-base Windows suite passed. The older changes-requested reviews refer to earlier code and removed diagnostics. |
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Closing because merged PR #319 covers this Windows assembly fix. |
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| test('rejects an absolute package link outside the declared tracing root', async () => { |
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🟡 Minor · tests — No test for a dangling absolute link being left for the validator to reject
The PR description promises "Leave dangling and out-of-root links as errors" for absolute links, and the code implements both paths (realpath failure → continue at build.ts:235-238, then the dangling-symlink rejection from assertBundleSymlinksStayInside). Only the out-of-root case is tested (this test). A dangling absolute link exercises a distinct skip-and-fail path with a different error message and is easy to regress (e.g., a future change that treats realpath failure as staging failure or silently drops the link).
Recommended fix
Add a sibling test that creates the absolute link with a nonexistent target (e.g. fs.symlinkSync(path.join(root, 'node_modules', 'gone'), linkPath, 'dir')) and asserts assemble rejects with /dangling symlink/.
| const sourceTarget = path.isAbsolute(rawTarget) | ||
| ? rawTarget | ||
| : path.resolve(path.dirname(sourceLink), rawTarget); | ||
| if (isWithin(sourceReal, sourceTarget)) continue; |
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🟡 Minor · correctness — Nested absolute symlink inside a staged target is left pointing at the build machine on POSIX, failing assembly
On POSIX copyTreeVerbatim copies symlinks verbatim, so a nested symlink whose raw target is absolute and lexically inside its own source tree (isWithin(sourceReal, sourceTarget)) hits the continue and is never rewritten. The staged copy's link still stores the build-machine absolute path, so assertBundleSymlinksStayInside later rejects the whole assembly with "symlink whose target escapes the bundle" — even though the target is inside the declared tracing root and stageable. The same case works on Windows only because copyTreeThroughBundleLinks re-anchors in-source junctions into the staged copy before this check runs. Fails safe (no bad artifact), but turns an assemblable build into an error.
Recommended fix
Skip the rewrite only when the link inside the staged copy already resolves within that copy, instead of when the original's raw target is lexically within sourceReal:
| if (isWithin(sourceReal, sourceTarget)) continue; | |
| const stagedRaw = await fs.promises.readlink(stagedLink); | |
| if (isWithin(target, path.resolve(path.dirname(stagedLink), stagedRaw))) continue; |
This keeps the Windows re-anchored-junction skip (the staged junction resolves inside the staged copy) while rewriting POSIX verbatim absolute links through the existing realpath → boundary check → stage path.
1 participant
Why
Next.js standalone output on Windows can contain absolute package links. Copying them unchanged retains a build-machine path, so Composer correctly rejects the artifact.
This PR is stacked on #305: that PR makes bundle directory links usable without Windows symlink privilege; this PR handles Next.js-specific absolute targets.
Change
Verification
This does not claim a full Windows cloud deployment. After #305 merges, retarget this PR to main and re-run CI. No diagnostic workflow is part of this PR.