Add config-based path shorthands #9144
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When doing local development, users may wish to specify many `path`
dependencies that all live in the same local directory. If that local
directory is not a short distance from the `Cargo.toml`, this can get
unwieldy.
This patch introduces the notion of path "prefixes", which are defined
in `.cargo/config.toml`:
```toml
[path]
devdir = "/home/jon/dev/rust/"
```
Which can then be used as the root for path dependencies. For example:
```toml
foo = { path = "devdir::foo" }
bar = { path = "devdir::bar" }
baz = { path = "devdir::ws/baz" }
```
would fetch `foo` from `/home/jon/dev/rust/foo`, `bar` from
`/home/jon/dev/rust/bar`, and `baz` from `/home/jon/dev/rust/ws/baz`.
This feature also serves as a convenient way for external build systems
to mask build-dependent paths from the user. Consider a build system
that vendors first-party dependencies into
```
/home/user/workplace/feature-1/build/first-party-package/first-party-package-1.0/x86_64/dev/build/private/rust-vendored/
```
Instead of requiring users to hard-code that path, or the relative
equivalent, into their `Cargo.toml`, the build-system can instead
produce a project-local `.cargo/config.toml` that defines that path as
`path.vendored`, and the user can then use vendored dependencies using
```toml
foo = { path = "vendored::foo" }
```
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This is a very interesting approach! So far I think I like the idea. I think it will need an RFC before we can stabilize, and Team sign off before we merge. |
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I'd be happy to write up an RFC if there's a rough consensus from the team that an approach like this might be acceptable! |
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I had some time and wrote RFC 3074. |
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☔ The latest upstream changes (presumably #9175) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #8825) made this pull request unmergeable. Please resolve the merge conflicts. |
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Closing as there is now an open RFC for this. Feel free to reopen after that has been accepted. Thanks! |
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When doing local development, users may wish to specify many
pathdependencies that all live in the same local directory. If that local
directory is not a short distance from the
Cargo.toml, this can getunwieldy.
This patch introduces the notion of path "prefixes", which are defined
in
.cargo/config.toml:Which can then be used as the root for path dependencies. For example:
would fetch
foofrom/home/jon/dev/rust/foo,barfrom/home/jon/dev/rust/bar, andbazfrom/home/jon/dev/rust/ws/baz.This feature also serves as a convenient way for external build systems
to mask build-dependent paths from the user. Consider a build system
that vendors first-party dependencies into
Instead of requiring users to hard-code that path, or the relative
equivalent, into their
Cargo.toml, the build-system can insteadproduce a project-local
.cargo/config.tomlthat defines that path asbase.vendored, and the user can then use vendored dependencies using