Add support for complete config options locally.

src/docker/local.rs

@@ -1,7 +1,9 @@
 use std::io;
+use std::path::Path;
 use std::process::ExitStatus;
 
 use super::shared::*;
+use crate::cross_toml::CargoConfigBehavior;
 use crate::errors::Result;
 use crate::extensions::CommandExt;
 use crate::file::{PathExt, ToUtf8};
@@ -66,6 +68,25 @@ pub(crate) fn run(
         ]);
     }
 
+    // If we're using all config settings, we need to mount all `.cargo` dirs.
+    // We've already mounted the CWD, so start at the parents.
+    let mut host_cwd = paths.cwd.parent();
+    let mut mount_cwd = Path::new(&paths.directories.mount_cwd).parent();
+    if let CargoConfigBehavior::Complete = options.cargo_config_behavior {
+        while let (Some(host), Some(mount)) = (host_cwd, mount_cwd) {
+            let host_cargo = host.join(".cargo");
+            let mount_cargo = mount.join(".cargo");
+            if host_cargo.exists() {
+                docker.args(&[
+                    "-v",
+                    &format!("{}:{}:Z", host_cargo.to_utf8()?, mount_cargo.as_posix()?),
+                ]);
+            }
+            host_cwd = host.parent();
+            mount_cwd = mount.parent();
+        }
+    }
+
     if io::Stdin::is_atty() {
         docker.arg("-i");
         if io::Stdout::is_atty() && io::Stderr::is_atty() {

src/docker/remote.rs

@@ -11,6 +11,7 @@ use super::engine::Engine;
 use super::shared::*;
 use crate::cargo::CargoMetadata;
 use crate::config::bool_from_envvar;
+use crate::cross_toml::CargoConfigBehavior;
 use crate::errors::Result;
 use crate::extensions::CommandExt;
 use crate::file::{self, PathExt, ToUtf8};
@@ -1046,6 +1047,13 @@ pub(crate) fn run(
     )
     .wrap_err("when copying project")?;
 
+    // If we're using all config settings, write the combined
+    // config file to a fixed location (to avoid it becoming stale).
+    if let CargoConfigBehavior::Complete = options.cargo_config_behavior {
+        // TODO(ahuszagh) Need to write the file out.
+        todo!();
+    }
+
     let mut copied = vec![
         (&dirs.xargo, mount_prefix_path.join("xargo")),
         (&dirs.cargo, mount_prefix_path.join("cargo")),