add prepare step to remove ".cargo/config"

Author: Freax13

src/prepare.rs

@@ -3,6 +3,7 @@ use crate::{build::CratePatch, Crate, Toolchain, Workspace};
 use failure::{Error, Fail, ResultExt};
 use log::info;
 use std::path::Path;
+use std::fs::remove_file;
 use toml::{
     value::{Array, Table},
     Value,
@@ -38,6 +39,7 @@ impl<'a> Prepare<'a> {
     pub(crate) fn prepare(&mut self) -> Result<(), Error> {
         self.krate.copy_source_to(self.workspace, self.source_dir)?;
         self.validate_manifest()?;
+        self.remove_cargo_config()?;
         self.tweak_toml()?;
         self.capture_lockfile(false)?;
         self.fetch_deps()?;
@@ -68,6 +70,14 @@ impl<'a> Prepare<'a> {
         Ok(())
     }
 
+    fn remove_cargo_config(&self) -> Result<(), Error> {
+        let path = self.source_dir.join(".cargo").join("config");
+        if path.exists() {
+            remove_file(path)?;
+        }
+        Ok(())
+    }
+
     fn tweak_toml(&self) -> Result<(), Error> {
         let path = self.source_dir.join("Cargo.toml");
         let mut tweaker = TomlTweaker::new(&self.krate, &path, &self.patches)?;

tests/buildtest/crates/cargo-config/.cargo/config

@@ -0,0 +1,2 @@
+[build]
+target = "invalid-test-target"

tests/buildtest/crates/cargo-config/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "cargo-config"
+version = "0.1.0"
+authors = ["Tom Dohrmann <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

tests/buildtest/crates/cargo-config/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

tests/buildtest/mod.rs

@@ -73,6 +73,21 @@ fn test_sandbox_oom() {
     });
 }
 
+#[test]
+fn test_cargo_config() {
+    runner::run("cargo-config", |run| {
+        run.build(SandboxBuilder::new().enable_networking(false), |build| {
+            let storage = rustwide::logging::LogStorage::new(LevelFilter::Info);
+            rustwide::logging::capture(&storage, || -> Result<_, Error> {
+                build.cargo().args(&["run"]).run()?;
+                Ok(())
+            })?;
+            Ok(())
+        })?;
+        Ok(())
+    });
+}
+
 test_prepare_error!(
     test_missing_cargotoml,
     "missing-cargotoml",