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Turbopack: more strict vergen setup#93541

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eps1lon merged 3 commits into
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mischnic/stricter-vergen
May 7, 2026
Merged

Turbopack: more strict vergen setup#93541
eps1lon merged 3 commits into
canaryfrom
mischnic/stricter-vergen

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@mischnic

@mischnic mischnic commented May 6, 2026

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We were getting these errors and they didn't fail the build:

warning: next-napi-bindings@0.0.0: not within a suitable 'git' worktree!
warning: next-napi-bindings@0.0.0: VERGEN_GIT_DESCRIBE set to default
warning: next-napi-bindings@0.0.0: VERGEN_GIT_DIRTY set to default
warning: next-napi-bindings@0.0.0: `git rev-parse HEAD` failed

The issue comes from a change in Git 2.35 which started to refuse working on Git directories that were owned by a different uid. Our self-hosted runners used 2.34.1 whereas GH hosted runners use 2.50.

This PR:

  • Makes vergen strict (fail_on_error is moved before add_instructions so git errors actually fail the build instead of being emitted as silent warnings).
  • Improves the fallback git rev-parse HEAD error reporting in crates/next-napi-bindings/build.rs so the underlying status/stderr is surfaced.
  • Adds git config --global --add safe.directory /build to scripts/docker-native-build.sh so the bind-mounted workspace is accepted by Git inside the native build container.

Test plan

Without adding the safe directory we actually get the dubious ownership error:

warning: next-napi-bindings@0.0.0: git rev-parse HEAD failed with status exit status: 128: fatal: detected dubious ownership in repository at '/build'
-- https://github.com/vercel/next.js/actions/runs/25483622900/job/74773786959#step:14:732

With the fix

warning: next-napi-bindings@0.0.0: git HEAD: 5db3944
-- https://github.com/vercel/next.js/actions/runs/25484197578/job/74775661519#step:14:717

@github-actions github-actions Bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels May 6, 2026
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Stats from current PR

✅ No significant changes detected

📊 All Metrics
📖 Metrics Glossary

Dev Server Metrics:

  • Listen = TCP port starts accepting connections
  • First Request = HTTP server returns successful response
  • Cold = Fresh build (no cache)
  • Warm = With cached build artifacts

Build Metrics:

  • Fresh = Clean build (no .next directory)
  • Cached = With existing .next directory

Change Thresholds:

  • Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
  • Size: Changes < 1KB AND < 1% are insignificant
  • All other changes are flagged to catch regressions

⚡ Dev Server

Metric Canary PR Change Trend
Cold (Listen) 811ms 811ms █████
Cold (Ready in log) 773ms 773ms ▇███▆
Cold (First Request) 1.193s 1.189s ▇▆▇▆▁
Warm (Listen) 811ms 812ms █████
Warm (Ready in log) 771ms 773ms █▇██▆
Warm (First Request) 570ms 573ms ▇▆█▇▄
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 813ms 812ms █████
Cold (Ready in log) 803ms 800ms ▇█▆▆█
Cold (First Request) 3.346s 3.329s ▅▆▂▃▆
Warm (Listen) 812ms 810ms █████
Warm (Ready in log) 789ms 787ms ▇█▆▆█
Warm (First Request) 3.212s 3.266s █▇▃▄▇

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 4.704s 4.644s █▂▆▇▄
Cached Build 4.732s 4.749s ▇▂▇█▁
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 24.319s 24.222s ▅▄▃▃▄
Cached Build 24.281s 24.275s ▆▆▄▄▆
node_modules Size 505 MB 505 MB ▁▁▁██
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/29622c644f3da49acb06cb29b32e6e6acf66c0d4/next

Commit: 29622c6

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github-actions Bot commented May 6, 2026

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Tests Passed

Commit: 29622c6

The vergen-gitcl build script in next-napi-bindings calls git rev-parse,
which fails with "dubious ownership in repository at '/build'" because
the bind-mounted workspace is owned by a different uid than the
container's root user.
@sokra sokra marked this pull request as ready for review May 7, 2026 08:19
@eps1lon eps1lon enabled auto-merge (squash) May 7, 2026 08:41
@eps1lon eps1lon merged commit ead8013 into canary May 7, 2026
184 checks passed
@eps1lon eps1lon deleted the mischnic/stricter-vergen branch May 7, 2026 08:50
eps1lon added a commit that referenced this pull request May 7, 2026
Co-authored-by: Tobias Koppers <tobias.koppers@googlemail.com>
Co-authored-by: Sebastian Sebbie Silbermann <sebastian.silbermann@vercel.com>
@github-actions github-actions Bot locked as resolved and limited conversation to collaborators May 21, 2026
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