[VPEX][5a] Add local-env package-manager interface, detection, and preflight#5850
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Integration test reportCommit: f24c320
8 interesting tests: 4 SKIP, 3 RECOVERED, 1 KNOWN
Top 6 slowest tests (at least 2 minutes):
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Split from the pipeline layer so the PackageManager seam (implemented by the uv backend in a later PR), manager detection, and the writability preflight land as a small, independently reviewable unit. - pkgmanager.go: the PackageManager interface the pipeline provisions through. - detect.go: uv-vs-not-uv detection (biased toward uv, whose native project file is the pyproject.toml this command drives), the non-blaming guidance message for unsupported managers, and the ensureWritable preflight. Co-authored-by: Isaac
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Approving. Clean leaf of the stack: detectManager is pure-fs with no telemetry (matches its doc), the uv-bias logic is well-reasoned and fully table-tested, and ensureWritable + managerGuidance are covered. PackageManager interface is small and well-documented (the PostProvision/pip-seeding comment captures a real VS Code quirk). No findings.
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Integration test reportCommit: f7c9cee
37 interesting tests: 17 FAIL, 15 flaky, 2 RECOVERED, 2 SKIP, 1 KNOWN
Top 50 slowest tests (at least 2 minutes):
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…5851) ## Why - The earlier layers (resolve / fetch / merge) need an orchestrator that runs them in order, reports structured per-phase status, and provisions the environment — without mutating disk in `--check` dry-run mode. - This is the core half of the split described in databricks#5850: the six-phase pipeline itself, stacked on the package-manager/detection layer. ## What - **`pipeline.go`** — the six-phase orchestrator (`preflight → resolve → fetch → merge → provision → validate`). It records per-phase status into `Result` and returns typed `PipelineError`s carrying `FailurePhase` and `DiskMutated`. Under `--check` it computes and reports the plan (with a diff) and performs no writes, skipping the writability probe and package-manager availability (neither is needed to compute the plan). - The merge base is the **live `pyproject.toml`**. `MergeManaged` rewrites only the three managed regions and is idempotent on its own output, so a re-run preserves edits the user made between syncs. The `.bak` is a one-time safety copy of the pre-sync original (created only when none exists, on the first sync of an existing project); an unreadable or unstattable existing file fails loudly rather than being misread as greenfield and overwritten. - `constraints-only` stops *managing* the databricks-connect pin rather than removing it: a greenfield project renders `dev = []` (no databricks-connect), and an existing project that already pins databricks-connect keeps its pin untouched. ## Testing strategy - End-to-end unit tests of the phase machine against a fake `PackageManager` + stub compute + `httptest` server: `--check` mutates nothing (even on a read-only dir / without a package manager) and reports a plan that matches a real re-run (no spurious backup, empty diff when idempotent), greenfield vs. existing, the merge basing on the live file so between-sync edits survive, backup safety on unreadable/unstattable files, constraints-only behavior, preflight exits (`E_MANAGER_UNSUPPORTED` / `E_UV_MISSING`), and phase/error attribution (`pipeline_test.go`). - Gates: `go build`, `go test`, `golangci-lint` (0 issues), `deadcode`, `gofmt` — all green. --- ## About this stack **Review bottom-up.** This PR targets databricks#5850 as its base, so its diff shows only the pipeline layer. This PR and databricks#5850 together supersede databricks#5828. This pull request and its description were written by Isaac.
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Why
[VPEX][5/8]) reads as +3,466 / 15 files on GitHub, but that is an artifact: PRs 1–4 were squash-merged intomainwhiledbconnect/05-pipelinestill sits on the pre-merge parent, so GitHub re-counts all of the already-merged code. The genuinely-new content in that layer is +1,165 / 5 files.PackageManagerinterface, manager detection, and the writability preflight — none of which reference the pipeline orchestrator.What
pkgmanager.go— thePackageManagerinterface the pipeline provisions through (implemented by the uv backend in a later PR).detect.go— uv-vs-not-uv detection (biased toward uv, whose native project file is thepyproject.tomlthis command drives), the non-blaming guidance message shown for an unsupported manager, and theensureWritablepreflight.pyprojectFileconstant moves here frompipeline.go, since detection is its first consumer.Testing strategy
detect_test.gocovers the detection matrix (greenfield, uv lock, plain pyproject, conda/pip precedence),ensureWritableon a writable and a non-existent dir, and the unsupported-manager guidance message.go build,go test,golangci-lint(0 issues),deadcode,gofmt— all green.About this stack
This is one of a series of small, stacked PRs that together add the
databricks local-env python synccommand. It supersedes the pipeline half of #5828, split further at the interface/detection seam. Review bottom-up.This PR and #5b (the six-phase pipeline orchestrator, stacked on this one) together replace #5828.
This pull request and its description were written by Isaac.