With the fixes for bug 1323557 [1] and cargo-vendor issue #71 [2], it's
now more straightforward to modify a vendored Rust crate to test changes
locally or on tryserver.
To do so, specify the crate's vendored path in the [patch.crates-io]
section of the top-level Cargo.toml file. For example, to modify the
"zip" crate, add this line to that section:
zip = { path = "third_party/rust/zip" }
Then run `mach vendor rust`, which will update Cargo.lock with the
patched location of the crate:
$ mach vendor rust
Adding zip v0.3.1 (file:///path/to/workdir/third_party/rust/zip)
Removing zip v0.3.1
You'll need the latest version of cargo-vendor, 0.1.14, which you can
get via `cargo install --force cargo-vendor`.
-myk
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1323557
[2] https://github.com/alexcrichton/cargo-vendor/pull/71
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