1361734 - mach vendor rust should be able to update a particular crate only

Status: NEW

(Firefox Build System :: General, enhancement)

Description

[Henri Sivonen (:hsivonen)]

I asked on dev-platform:
>> I have toolkit/library/rust/shared/Cargo.toml depending on a crates.io
>> crate encoding_c, which depends on encoding_rs.
>>
>> Then I update the minor version of encoding_rs on crates.io but don't
>> update encoding_c.
>>
>> Now if I re-run ./mach vendor rust, nothing happens, because I didn't
>> change the encoding_c dependency version in
>> toolkit/library/rust/shared/Cargo.toml to force the dependencies to be
>> unsatisfied.
>>
>> If, instead, I delete toolkit/library/rust/shared/Cargo.lock and then
>> run ./mach vendor rust, I get minor version updates to all crates in
>> the dependency graph that have changed since they were vendored.
>>
>> Other than manually merging lock files and unstaging unrelated crate
>> changes, how do I scope the re-vendoring to encoding_rs only?

And Kartikaya Gupta replied:
> cd toolkit/library/rust
> cargo update -p encoding_rs --precise <version>
> cd ../gtest/rust
> cargo update -p encoding_rs --precise <version>
> cd ../../../../
> mach vendor rust

...which works, but isn't a good user experience.

Please make mach vendor rust take an optional parameter to update a particular crate only (i.e. automate the cargo update -p foo --precise x.y.z bits above).