Fix rust compilation

When using rustup, rustc is a symlink: we must not change the binary
name using canonicalize.

Author: Virv12

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
 channel = "1.88"
-components = [ "rustfmt", "clippy" ]
+components = [ "rustfmt", "clippy", "rust-analyzer" ]

task-maker-exec/src/execution_unit/sandbox.rs

@@ -391,8 +391,9 @@ impl Sandbox {
             ExecutionCommand::System(cmd) => {
                 if let Ok(cmd) = which::which(cmd) {
                     // Always mount the directory with the executable.
-                    let cmd = std::fs::canonicalize(cmd).context("Failed to canonicalize path")?;
-                    let path = cmd.parent().expect("invalid binary path");
+                    let path =
+                        std::fs::canonicalize(&cmd).context("Failed to canonicalize path")?;
+                    let path = path.parent().expect("invalid binary path");
                     if !mounted_dirs.contains(path) {
                         config.mount(path, path, false);
                         mounted_dirs.insert(path);
@@ -646,10 +647,7 @@ mod tests {
         assert_eq!(config.stdin, Some("/dev/null".into()));
         assert_eq!(config.stdout, Some("/dev/null".into()));
         assert_eq!(config.stderr, Some("/dev/null".into()));
-        assert_eq!(
-            config.executable,
-            std::fs::canonicalize(Path::new("/bin/sh")).unwrap()
-        );
+        assert_eq!(config.executable, Path::new("/bin/sh"));
         assert_eq!(config.args, vec!["bar", "baz"]);
     }
 }

tests/classic.rs

@@ -18,6 +18,7 @@ fn classic(test: TestInterface) {
         .must_compile("tle.cpp")
         .must_compile("wa.cpp")
         .must_compile("wrong_file.cpp")
+        .must_compile("rust.rs")
         .must_not_compile("not_compile.cpp")
         // .not_compiled(".ignoreme.cpp")
         .not_compiled("bash.sh")
@@ -33,6 +34,7 @@ fn classic(test: TestInterface) {
         .solution_score("tle.cpp", vec![5.0, 45.0, 0.0])
         .solution_score("wa.cpp", vec![0.0, 0.0, 0.0])
         .solution_score("wrong_file.cpp", vec![0.0, 0.0, 0.0])
+        .solution_score("rust.rs", vec![5.0, 45.0, 50.0])
         .solution_statuses("soluzione.py", vec![Accepted("Output is correct".into())])
         .solution_statuses("bash.sh", vec![Accepted("Output is correct".into())])
         // .solution_statuses("mle.cpp", vec![RuntimeError]) // pretty unreliable