diff --git a/xtask/src/build/cargo.rs b/xtask/src/build/cargo.rs
index 9e12c0c2..869e1268 100644
--- a/xtask/src/build/cargo.rs
+++ b/xtask/src/build/cargo.rs
@@ -36,7 +36,11 @@ pub enum CargoBuilder<'e> {
 }
 
 impl<'e> CargoBuilder<'e> {
-    pub fn run<P: AsRef<Path>, S: AsRef<OsStr>>(self, dir: P, arg: S) -> Result<(), Error> {
+    fn make_command<P: AsRef<Path>, S: AsRef<OsStr>>(
+        self,
+        dir: P,
+        arg: S,
+    ) -> Result<Command, Error> {
         let arg = arg.as_ref();
         let mut command = Command::new("cargo");
 
@@ -239,6 +243,12 @@ impl<'e> CargoBuilder<'e> {
               // }
         }
 
+        Ok(command)
+    }
+
+    pub fn run<P: AsRef<Path>, S: AsRef<OsStr>>(self, dir: P, arg: S) -> Result<(), Error> {
+        let mut command = self.make_command(dir, arg)?;
+
         log::trace!("Run cargo: {:?}", command);
 
         let status = command.status()?;