Support path dependencies for Cargo.toml patches in vendor mode

[jayzhuang]

I tried running crate_universe from 0.56.0, which includes #3025 in Fuchsia's build, I saw the following error when generating build files:

Error: Failed to get crate from cache for Package { name: Name("askama"), version: Version { major: 0, minor: 12, patch: 1 }, source: Some(SourceId { url: Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("github.com")), port: None, path: "/rust-lang/crates.io-index", query: None, fragment: None }, kind: Registry, precise: Some("locked"), name: None }), checksum: Some(Sha256(b79091df18a97caea757e28cd2d5fda49c6cd4bd01ddffd7ff01ace0c0ad2c28)), dependencies: [Dependency { name: Name("askama_derive"), version: Version { major: 0, minor: 12, patch: 5 }, source: None }, Dependency { name: Name("askama_escape"), version: Version { major: 0, minor: 10, patch: 3 }, source: Some(SourceId { url: Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("github.com")), port: None, path: "/rust-lang/crates.io-index", query: None, fragment: None }, kind: Registry, precise: Some("locked"), name: None }) }], replace: None }

Caused by:
    No such file or directory (os error 2)

For askama, we have the following entry in our Cargo.toml (this is the full file if it helps):

askama = { version = "0.12.1", default-features = false, features = ["config"] }

This is the crate_vendor Bazel target I'm using:

crates_vendor(
    name = "crates_vendor",
    bazel = "//:bazel",
    buildifier = "//:buildifier",
    cargo_lockfile = "//:third_party/rust_crates/Cargo.lock",
    manifests = ["//:third_party/rust_crates/Cargo.toml"],
    mode = "local",
    render_config = render_config(
        generate_rules_license_metadata = True,
    ),
    supported_platform_triples = [
        "x86_64-unknown-linux-gnu",
    ],
    vendor_path = "third_party/rust_crates/vendor",
)

(Some relevant discussions in #3071)

[UebelAndre]

I believe the root cause is frewsxcv/rust-crates-index#182. The error looks similar to what I saw on #3179 (comment). I haven't had time to put up a pull-request for that change to crates-index, help would be greatly appreciated!

[jayzhuang]

Following suggestion from @illicitonion in #3071, I tried running with an older toolchain (1.83.0), and am getting a different error (with rules_rust version 0.56.0:

...
thread 'main' panicked at src/utils.rs:51:18:
Could not rename paths: Os { code: 2, kind: NotFound, message: "No such file or directory" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
...

[jayzhuang]

Hey @illicitonion , I got PR #3274, it works for my use case. PTAL.