Add --force-non-host for rustup.

Co-authored-by: Markus Reiter <me@reitermark.us>

Author: Alexhuszagh

.changes/554.json

@@ -0,0 +1,5 @@
+{
+    "type": "fixed",
+    "description": "add the `--force-non-host` flag for newer rustup versions",
+    "issues": [536]
+}

Cargo.lock

@@ -46,6 +46,7 @@ directories = "4.0.1"
 walkdir = { version = "2", optional = true }
 tempfile = "3.3.0"
 owo-colors = { version = "3.4.0", features = ["supports-colors"] }
+semver = "1"
 
 [target.'cfg(not(windows))'.dependencies]
 nix = { version = "0.24", default-features = false, features = ["user"] }

Cargo.toml

@@ -130,10 +130,31 @@ cross will not attempt to configure the toolchain further so that it can run you
     })
 }
 
+fn version(msg_info: &mut MessageInfo) -> Result<Version> {
+    let out = rustup_command(msg_info, false)
+        .arg("--version")
+        .run_and_get_stdout(msg_info)?;
+
+    match out
+        .lines()
+        .next()
+        .and_then(|line| line.split_whitespace().nth(1))
+    {
+        Some(version) => {
+            semver::Version::parse(version).wrap_err_with(|| "failed to parse rustup version")
+        }
+        None => eyre::bail!("failed to get rustup version"),
+    }
+}
+
 pub fn install_toolchain(toolchain: &QualifiedToolchain, msg_info: &mut MessageInfo) -> Result<()> {
+    let mut command = rustup_command(msg_info, false);
     let toolchain = toolchain.to_string();
-    rustup_command(msg_info, false)
-        .args(&["toolchain", "add", &toolchain, "--profile", "minimal"])
+    command.args(&["toolchain", "add", &toolchain, "--profile", "minimal"]);
+    if version(msg_info)? >= semver::Version::new(1, 25, 0) {
+        command.arg("--force-non-host");
+    }
+    command
         .run(msg_info, false)
         .wrap_err_with(|| format!("couldn't install toolchain `{toolchain}`"))
 }