Add support for building rust with linked c libraries (#218)

* add support for building rust with linked c libraries

* debug

* ready for review

* only install musl-tools when `NO_MUSL` isn't set

examples/rust-ring/.gitignore

@@ -0,0 +1,14 @@
+# Created by https://www.toptal.com/developers/gitignore/api/rust
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# End of https://www.toptal.com/developers/gitignore/api/rust
+

examples/rust-ring/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "rust-ring"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ring = "0.16.20"

examples/rust-ring/src/main.rs

@@ -0,0 +1,5 @@
+use ring as _;
+
+fn main() {
+    println!("Hello from rust");
+}

src/providers/rust.rs

@@ -52,6 +52,10 @@ impl Provider for RustProvider {
             setup_phase.add_file_dependency(toolchain_file);
         }
 
+        if !env.is_config_variable_truthy("NO_MUSL") {
+            setup_phase.add_apt_pkgs(vec!["musl-tools".to_string()]);
+        }
+
         Ok(Some(setup_phase))
     }
 

tests/docker_run_tests.rs

@@ -366,6 +366,13 @@ fn test_rust_custom_version() {
     assert!(output.contains("cargo 1.56.0"));
 }
 
+#[test]
+fn test_rust_ring() {
+    let name = simple_build("./examples/rust-ring");
+    let output = run_image(name, None);
+    assert!(output.contains("Hello from rust"));
+}
+
 #[test]
 fn test_go() {
     let name = simple_build("./examples/go");