fix: Pre-warm corepack cache to prevent yarn/pnpm tests from hanging#12099
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Previous fixes (#12090, #12095) set COREPACK_ENABLE_DOWNLOAD_PROMPT=0 and COREPACK_ENABLE_STRICT=0, which prevented interactive prompts but did not stop corepack from downloading PM binaries from the network. On CI with a cold cache, these downloads cause tests to exceed the 240s timeout. Add `corepack prepare <pm>@<version> --activate` during test setup so the exact declared version is cached locally before any test runs. This covers both setup_integration_test and setup_lockfile_test paths.
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Corepack only manages yarn and pnpm. Running corepack enable/prepare for bun or npm fails since corepack doesn't support them. Guard both setup_package_manager and prepare_corepack_from_package_json to only invoke corepack for supported PMs. Fixes test_lockfile_aware_caching_bun failure.
npm is managed by corepack. Only bun is unsupported.
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## Release v2.8.13-canary.11 > [!CAUTION] > Versioned docs aliasing FAILED. [View logs](https://github.com/vercel/turborepo/actions/runs/22582224414) ### Changes - release(turborepo): 2.8.13-canary.10 (#12103) (`0362361`) - perf: Reduce allocations in file hash computation (#12102) (`5a55bbe`) - perf: Replace SWC with oxc for JS/TS parsing (#12098) (`910b557`) - fix: Pre-warm corepack cache to prevent yarn/pnpm tests from hanging (#12099) (`caaf6b8`) --------- Co-authored-by: Turbobot <turbobot@vercel.com>
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## Release v2.8.13-canary.12 > [!CAUTION] > Versioned docs aliasing FAILED. [View logs](https://github.com/vercel/turborepo/actions/runs/22584334499) ### Changes - fix: Pre-warm corepack cache to prevent yarn/pnpm tests from hanging (#12099) (`caaf6b8`) - release(turborepo): 2.8.13-canary.11 (#12108) (`5375984`) - perf: Disable unused zstd default features to reduce C compilation (#12107) (`b6e5690`) - perf: Replace `git` subprocess in worktree detection with Rust (#12106) (`0eef739`) --------- Co-authored-by: Turbobot <turbobot@vercel.com>
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Summary
COREPACK_ENABLE_DOWNLOAD_PROMPT=0andCOREPACK_ENABLE_STRICT=0to address hanging yarn tests, but neither flag prevents corepack from downloading PM binaries from the network. On CI with a cold corepack cache, these downloads cause tests liketest_single_package_build_yarnto exceed the 240s timeout.corepack prepare <pm>@<version> --activateduring test setup so the exact declared version is cached locally before any test invokes it. This covers bothsetup_integration_testandsetup_lockfile_testpaths, fixing the hang for all PM-based integration tests.COREPACK_ENABLE_STRICT=0workaround that was based on a misunderstanding of what that flag does (it controls cross-PM enforcement, not version downloading).How to test
The
test_single_package_build_yarnandtest_lockfile_aware_caching_yarntests should no longer hang or appear as SLOW in CI.