Change config paths to only check CARGO_HOME for cargo-script

Signed-off-by: Rustin170506 <29879298+Rustin170506@users.noreply.github.com>

Author: 0xPoe

src/bin/cargo/commands/run.rs

@@ -171,12 +171,8 @@ pub fn exec_manifest_command(gctx: &mut GlobalContext, cmd: &str, args: &[OsStri
 
     let manifest_path = root_manifest(Some(manifest_path), gctx)?;
 
-    // Treat `cargo foo.rs` like `cargo install --path foo` and re-evaluate the config based on the
-    // location where the script resides, rather than the environment from where it's being run.
-    let parent_path = manifest_path
-        .parent()
-        .expect("a file should always have a parent");
-    gctx.reload_rooted_at(parent_path)?;
+    // Reload to cargo home.
+    gctx.reload_rooted_at(gctx.home().clone().into_path_unlocked())?;
 
     let mut ws = Workspace::new(&manifest_path, gctx)?;
     if gctx.cli_unstable().avoid_dev_deps {

tests/testsuite/script.rs

@@ -1,4 +1,7 @@
+use std::fs;
+
 use cargo_test_support::basic_manifest;
+use cargo_test_support::paths::cargo_home;
 use cargo_test_support::prelude::*;
 use cargo_test_support::registry::Package;
 use cargo_test_support::str;
@@ -318,26 +321,47 @@ rustc = "non-existent-rustc"
         .file("script.rs", script)
         .build();
 
-    // Verify the config is bad
+    // Verify that the config from current directory is used
     p.cargo("-Zscript script.rs -NotAnArg")
         .masquerade_as_nightly_cargo(&["script"])
-        .with_status(101)
-        .with_stderr_data(str![[r#"
-[ERROR] could not execute process `non-existent-rustc -vV` (never executed)
-
-Caused by:
-  [NOT_FOUND]
+        .with_stdout_data(str![[r#"
+bin: [ROOT]/home/.cargo/target/[HASH]/debug/script[EXE]
+args: ["-NotAnArg"]
 
 "#]])
         .run();
 
-    // Verify that the config isn't used
+    // Verify that the config from parent directory is not used
     p.cargo("-Zscript ../script/script.rs -NotAnArg")
         .masquerade_as_nightly_cargo(&["script"])
         .with_stdout_data(str![[r#"
 bin: [ROOT]/home/.cargo/target/[HASH]/debug/script[EXE]
 args: ["-NotAnArg"]
 
+"#]])
+        .run();
+
+    // Write a global config.toml in the cargo home directory
+    let cargo_home = cargo_home();
+    fs::write(
+        &cargo_home.join("config.toml"),
+        r#"
+[build]
+rustc = "non-existent-rustc"
+"#,
+    )
+    .unwrap();
+
+    // Verify the global config is used
+    p.cargo("-Zscript script.rs -NotAnArg")
+        .masquerade_as_nightly_cargo(&["script"])
+        .with_status(101)
+        .with_stderr_data(str![[r#"
+[ERROR] could not execute process `non-existent-rustc -vV` (never executed)
+
+Caused by:
+  [NOT_FOUND]
+
 "#]])
         .run();
 }