[experiment] patch with patch files (re-resolve) #14055
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☔ The latest upstream changes (presumably #14026) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #14234) made this pull request unmergeable. Please resolve the merge conflicts. |
Since `[patch]` section exists also in config, so have it inboth cargo-features and -Z flag.
`SourceKind::Patched` represents a source patched by local patch files.
One thing left out here is a consistent/stable hash for patches, The are absolute local paths that might introduces unnecessary changes in lockfile. To mitigate this, patches under the current workspace root will be relative.
Only after a few dependency resolution happen, can a `[patch]` entry with patch files know which version it is going to patch. Hence we need to "delay" the patch process until at least one resolution is done, and re-resolves the graph is any patch become applicable with the newly resolved dependency graph.
We've tracked patched depencencies in Cargo.lock with the `patched+` protocol. However, we don't really make use of it when rebuilding from a lockfile. This PR fixes that. You can see the test cases now won't update registry becaseu it starts resuing locked patch dependencies.
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☔ The latest upstream changes (presumably #13947) made this pull request unmergeable. Please resolve the merge conflicts. |
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See #13779 (comment). |
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What does this PR try to resolve?
This is an alternative of #13779.
Most parts of the design are the same. The differences are:
patchentry no longer requires an exact version requirement, e.g.=1.2.3.Instead, only after a few rounds of dependency resolutions can a patch entry know which package version it is going to patch.
patchis able to match multiple versions, if applicable.package.versionfield to a SemVer incompat version is allowed but kinda useless. The metadata of patched package, for example v2.0.0-to-v1.0.0, is different from the metadata of the real v1.0.0. Thus rustc things they are different versions.How should we test and review this PR?
This is built upon #13779 with two new commits.
While this works, I don't think the code change is in a good state to merge. The design (hacking on a new
SourceKind) could be inherently wrong.The ugliest part is code that handles the reuse of existing patched in lockfile edd3172. There are rooms for cleanup but I don't believe it'll be significantly better.
Additional information
Doc hasn't got updated.