mach: Install Rust toolchain during bootstrap if needed (#35795)

Signed-off-by: Delan Azabani <dazabani@igalia.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/python/servo/platform/base.py b/python/servo/platform/base.py
index 81963777a80..0f2bf25de15 100644
--- a/python/servo/platform/base.py
+++ b/python/servo/platform/base.py
@@ -60,6 +60,7 @@ class Base:
         installed_something = False
         if not skip_platform:
             installed_something |= self._platform_bootstrap(force)
+        self.install_rust_toolchain()
         if not skip_lints:
             installed_something |= self.install_taplo(force)
             installed_something |= self.install_cargo_deny(force)
@@ -68,6 +69,14 @@ class Base:
         if not installed_something:
             print("Dependencies were already installed!")
 
+    def install_rust_toolchain(self):
+        # rustup 1.28.0, and rustup 1.28.1+ with RUSTUP_AUTO_INSTALL=0, require us to explicitly
+        # install the Rust toolchain before trying to use it.
+        print(" * Installing Rust toolchain...")
+        if subprocess.call(["rustup", "show", "active-toolchain"]) != 0:
+            if subprocess.call(["rustup", "toolchain", "install"]) != 0:
+                raise EnvironmentError("Installation of Rust toolchain failed.")
+
     def install_taplo(self, force: bool) -> bool:
         if not force and shutil.which("taplo") is not None:
             return False