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| Check name | Status | Explanation |
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| Description check |  |
The description clearly explains that the pull request adds a documentation proposal for opt-in offline build-parallel behavior and identifies the validation performed. |
| Title check | |
The title clearly and concisely identifies the documentation proposal added by the pull request. |
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I found several open issues that would help place this proposal in context: #797 asks for a prepared layout and offline build-sequence; its author agreed that #995 covers the same goal. Could this proposal state which parts of those issues build-parallel --offline addresses, and which remain follow-up work? In particular, the required prepared artifacts, source-tree versus sdist input, and offline cache behavior seem worth deciding here. I would treat this PR as partial work toward #995 and #797, rather than closing either issue. |
LalatenduMohanty
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LalatenduMohanty
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Could you update the draft to reflect the linked issue discussions and the review threads here?
The How and Example sections should show the preparation workflow, required inputs, wheel-cache behavior, and source-tree versus sdist choice.
Please mark any decisions that remain open or are deferred to another issue.
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Inline comments:
Review comments at @docs/proposals/offline-build-parallel.md:
- Around line 102-104: Update the paragraph describing the prepared-workspace
consumer to identify build-parallel --offline as the command that consumes the
graph and workspace after the preparation bootstrap produces them; remove the
conflicting bootstrap-parallel --offline reference.
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Added a section for those |
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Document the prepared inputs, skipped phases, missing-artifact behavior, and network-isolation limits for offline wheel builds. Incorporate PR review feedback: explain the opt-in choice as a step toward the bootstrap/build split (python-wheel-build#995), state the sdist contract and how prepared sdists and source trees are located and validated, define the required preparation inputs and their couplings, document the remote-cache and skipped-hook limitations, and add a related-issues section mapping what the proposal addresses versus leaves as follow-up work. Co-Authored-By: Claude Code <noreply@anthropic.com> Signed-off-by: Sean Pryor <spryor@redhat.com>
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Doc has been updated, can we double-check and see if it's ready for commit @dhellmann @LalatenduMohanty @smoparth |
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This looks good to me. I will leave it to other maintainers for final approval since they had comments on earlier draft |
EmilienM
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Another iteration needed: 3 major, 8 minor (inline)
The constraints and pre-built reuse claims contradict the behavior the proposal builds on, and the example's offline command consumes the workspace it depends on.
How this was reviewed
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3d67174, round 1 - Deep review, because a deep tier was requested (docs/proposals/offline-build-parallel.md is the only changed file)
- Passes: architecture, performance, security, scalability, then correctness
- Independent skeptics checked each candidate finding (2 for the major architecture candidate, 1 for minor ones); 5 of 8 held up
- Repo rules read from
70aa459: AGENTS.md, CLAUDE.md, CONTRIBUTING.md - Not covered: nothing skipped
| no prepared source exists for the package. | ||
| - **Constraints.** Version resolution happens during preparation and the | ||
| resolved versions are recorded in the graph, so the offline build does not | ||
| need constraints and does not consult them. Fromager reads every |
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Major: The offline build does consult constraints. The local-wheel reuse check this proposal preserves filters candidates by the startup-loaded constraints (_is_wheel_built → resolve_all_cached_wheels → PyPICacheProvider(constraints=ctx.constraints)), so a constraints file that differs from the preparation run suppresses reuse of a wheel that matches the graph's pinned version and forces a needless rebuild or a hard failure. The bullet should require the offline invocation to pass either no constraints or the same constraints files as the preparation run.
| It does not prevent a package's wheel-build hook or build tool from attempting | ||
| network access. Plugins configured with `network_isolation: false` may still | ||
| attempt remote access, and tools such as Bazel may fetch dependencies during |
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Minor: There is no per-plugin network_isolation setting; it is a global CLI flag and a per-call argument of external_commands.run().
| It does not prevent a package's wheel-build hook or build tool from attempting | |
| network access. Plugins configured with `network_isolation: false` may still | |
| attempt remote access, and tools such as Bazel may fetch dependencies during | |
| It does not prevent a package's wheel-build hook or build tool from attempting | |
| network access. Plugin hooks and package build tools can invoke commands that | |
| bypass Fromager's network-isolation wrapper (Fromager itself disables it for | |
| git operations and Rust vendoring), and tools such as Bazel may fetch | |
| dependencies during the wheel build. |
| stops with a clear error if a required artifact is missing or inconsistent; it | ||
| does not retry the skipped preparation steps online. | ||
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| The prepared sdist for a node is located by its expected filename, including |
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Minor: Per-node discovery by expected filename with a fallback scan rides find_sdist()'s per-lookup globs, up to 8 directory scans per node when no destination_filename setting exists, which is O(nodes × files) where today's build-parallel fetch is O(1) via node.download_url. Consider specifying a one-time index instead: record each node's prepared sdist filename and source path in graph.json during preparation, or do one startup scan of the downloads and work directories.
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| ## Limitations | ||
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| `--offline` prevents Fromager from fetching sources, preparing them, creating |
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Minor: --offline still fetches remote --constraints-file URLs at startup before any command runs, and the proposal never mentions the existing --network-isolation flag, so the name reads as a hermeticity guarantee the design explicitly disclaims. Rejecting non-local constraints URLs when --offline is set, and documenting composition with --network-isolation (or renaming the flag to describe skipping preparation), would close that gap.
| the work directory. By default Fromager removes each package's source tree | ||
| as soon as its build metadata is recorded. A workspace prepared without |
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Minor: The timing is off. Build metadata is written during prepare_source, but the source tree is removed only after the package's build completes (the bootstrapper's complete phase, or after the wheel build in the build commands). As written, the sentence implies the tree is gone before the sdist and build environment exist.
| the work directory. By default Fromager removes each package's source tree | |
| as soon as its build metadata is recorded. A workspace prepared without | |
| the work directory. By default Fromager removes each package's source tree | |
| and build environment after its build completes. A workspace prepared without |
| - **Git source resolvers** ([#1205](https://github.com/python-wheel-build/fromager/issues/1205), | ||
| [#1206](https://github.com/python-wheel-build/fromager/issues/1206)): | ||
| offline mode depends on bootstrap producing source trees and sdists, so | ||
| packages using the git-clone source resolvers need that preparation |
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Minor: Both cited issues (#1205, #1206) were closed as completed on 2026-10-23; the work sits on the new-resolver-config branch pending merge to main (open PR #1414). "Need that preparation work to land first" reads as pending against closed issues, so it is worth rewording to where the work actually stands.
| does not retry the skipped preparation steps online. | ||
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| The prepared sdist for a node is located by its expected filename, including | ||
| any package naming hooks, falling back to the name and version parsed from |
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Minor: As worded, the fallback parses names and versions out of the files present, which can select an sdist of the wrong version, the exact same-name/different-run ambiguity the next sentence dismisses. The existing find_sdist matches the expected name and version (under naming-convention variants) against the files present; saying that instead would keep the implementation on the safe path.
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| ## How | ||
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| A workflow prepares a package graph and workspace by running |
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Minor: bootstrap-parallel already chains a sdist-only bootstrap with build-parallel and manages cleanup state between the phases (it toggles cleanup_buildenv around the build phase), and the doc never says whether it gains or forwards --offline. Worth a note, since this workflow is a manual version of that command.
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| The offline build does not consult remote wheel caches or package indexes. | ||
| Each graph node is still checked against the local wheel repository, with the |
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Major: "Same reuse rules as an online build" cannot deliver the rule that pre-built packages require a local pre-built wheel. Online reuse treats a package's configured wheel_server_url as exclusive and never checks the local wheel repository for pre-built packages (get_wheel_server_urls), so as written every pre-built package resolves against its remote index offline and fails. The doc needs to define the local-first lookup for pre-built packages rather than deferring to the online rules.
| fromager --no-cleanup bootstrap --sdist-only 'stevedore==5.2.0' | ||
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| # Offline wheel build: no external network access required. | ||
| fromager build-parallel --offline work-dir/graph.json |
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Major: The offline command omits --no-cleanup, and with the default cleanup the build deletes each package's prepared source tree and build environment as its wheel finishes (clean_build_dirs runs after the post-build hooks). The workspace becomes single-use, and the retry scenario at lines 143-145 (a build-tag mismatch needs the prepared source) fails. Pass --no-cleanup here and spell out the offline build's cleanup semantics, including reruns after a mid-run failure.
Summary
build-parallel --offlineconsumption of a bootstrap-prepared graph and workspace.This PR contains the proposal only; it does not include implementation changes.
Validation
pre-commit run --files docs/proposals/offline-build-parallel.mdpassed.