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Update the Rust toolchain example #314

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Feb 2, 2023
Merged

Update the Rust toolchain example #314

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147 changes: 147 additions & 0 deletions examples/toolchains/rust/Cargo.lock
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6 changes: 3 additions & 3 deletions examples/toolchains/rust/README.md
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Expand Up @@ -2,14 +2,14 @@ Rust Toolchain Example
======================

This is an example Rust project that uses `rules_rust`.
It showcases the integration nix, giving concrete example of how to approach project compilation with dependency on OpenSSL library.
It showcases the integration nix, giving concrete example of how to approach project compilation with dependency on OpenSSL library.

If the Nix package manager is present in the build environment, this example will use Nix to provide the Rust toolchain.
If the Nix package manager is present in the build environment, this example will use Nix to provide the Rust toolchain.
Otherwise, it will fail (it is possible to make the example run without nix, however it greatly obfuscates the core of the matter).

# Usage

To run the example with Nix, issue the following command:
```
nix-shell --command 'bazel run --config=nix :hello'
nix-shell --command 'bazel run --config=nix //:hello'
```
13 changes: 7 additions & 6 deletions examples/toolchains/rust/WORKSPACE
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Expand Up @@ -9,20 +9,20 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
# https://bazelbuild.github.io/rules_rust/#setup
http_archive(
name = "rules_rust",
sha256 = "73580f341f251f2fc633b73cdf74910f4da64d06a44c063cbf5c01b1de753ec1",
sha256 = "d125fb75432dc3b20e9b5a19347b45ec607fabe75f98c6c4ba9badaab9c193ce",
urls = [
"https://mirror.bazel.build/github.com/bazelbuild/rules_rust/releases/download/0.5.0/rules_rust-v0.5.0.tar.gz",
"https://github.com/bazelbuild/rules_rust/releases/download/0.5.0/rules_rust-v0.5.0.tar.gz",
"https://mirror.bazel.build/github.com/bazelbuild/rules_rust/releases/download/0.17.0/rules_rust-v0.17.0.tar.gz",
"https://github.com/bazelbuild/rules_rust/releases/download/0.17.0/rules_rust-v0.17.0.tar.gz",
],
# rules_rust 0.5.0 does not yet support direct
# rules_rust 0.17.0 does not yet support direct
# overriding toolchain used for build of cargo-bazel
# binary.
# On non-standard systems (viz. NixOS), that approach
# results in download of 'broken' rustc which then
# cannot build cargo bazel.
# This patch fixes the issue, allowing for toolchain
# specification.
#
#
# Note: This should be removed as soon as
# issue in rules_rust is resolved.
patches = [
Expand Down Expand Up @@ -118,7 +118,8 @@ crates_repository(
OPENSSL_CRATE_ANNOTATION
],
},
lockfile = "//:Cargo.Bazel.lock",
cargo_lockfile = "//:Cargo.lock",
lockfile = "//:cargo-bazel-lock.json",
packages = {
"openssl": crate.spec(
version = "0.10.40",
Expand Down
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