Exporting cargo compiler artifacts (tests, benches)

Motivation

It's quite challenging to export secondary artifacts like tests and benchmark executables. Those kind of artifacts can be very valuable for different reasons:

1. packing test executables in the contaier to run them later on a different platform
2. comparing and analyzing assembly of performance benchmarks

For final artifacts we have target/(release|debug)/{crate-name}, but test and benchmark executables are containing hash like target/release/deps/app-25de5d28a523d3c2. Moreover it changes every time compiler options are changed. For this reason methods like find and cp doesn't work well for extracting such artifacts.

Thankfully, compiler provide service messages (cargo build --message-format=json) which allows to list all the artifacts generated by the compiler.

Installing

$ cargo install --git=https://github.com/bazhenov/cargo-export.git

Using

$ cargo export target/tests -- test

Under the hood this command will run cargo test --no-run --message-format=json and copy all the generated binaries in the target/tests dirctory.