mach + rustup: use the minimal profile and install rustc-dev

etc/taskcluster/decision_task.py

@@ -181,9 +181,6 @@ def linux_tidy_unit_untrusted():
         .with_dockerfile(dockerfile_path("build"))
         .with_env(**build_env, **unix_build_env, **linux_build_env)
         .with_repo_bundle()
-        .with_script("rustup set profile minimal")
-        # required by components/script_plugins:
-        .with_script("rustup component add rustc-dev")
         .with_script("""
             ./mach test-tidy --no-progress --all
             ./mach test-tidy --no-progress --self-test
@@ -304,11 +301,10 @@ def with_rust_nightly():
         modified_build_env["RUSTFLAGS"] = " ".join(flags)
 
     return (
-        linux_build_task("with Rust Nightly", build_env=modified_build_env, install_rustc_dev=False)
+        linux_build_task("with Rust Nightly", build_env=modified_build_env)
         .with_treeherder("Linux x64", "RustNightly")
         .with_script("""
             echo "nightly" > rust-toolchain
-            rustup component add rustc-dev
             ./mach build --dev
             ./mach test-unit
         """)
@@ -850,7 +846,7 @@ def macos_task(name):
     )
 
 
-def linux_build_task(name, *, build_env=build_env, install_rustc_dev=True):
+def linux_build_task(name, *, build_env=build_env):
     task = (
         linux_task(name)
         # https://docs.taskcluster.net/docs/reference/workers/docker-worker/docs/caches
@@ -867,14 +863,8 @@ def linux_build_task(name, *, build_env=build_env, install_rustc_dev=True):
         .with_dockerfile(dockerfile_path("build"))
         .with_env(**build_env, **unix_build_env, **linux_build_env)
         .with_repo_bundle()
-        .with_script("""
-            rustup set profile minimal
-            ./mach bootstrap-gstreamer
-        """)
+        .with_script("./mach bootstrap-gstreamer")
     )
-    if install_rustc_dev:
-        # required by components/script_plugins:
-        task = task.with_script("rustup component add rustc-dev")
     return task
 
 
@@ -920,9 +910,6 @@ def windows_build_task(name, package=True, arch="x86_64"):
             path="python3",
         )
         .with_rustup()
-        .with_script("rustup set profile minimal")
-        # required by components/script_plugins:
-        .with_script("rustup component add rustc-dev")
     )
     if arch in hashes["non-devel"] and arch in hashes["devel"]:
         task = (
@@ -968,11 +955,6 @@ def macos_build_task(name):
         .with_repo_bundle(alternate_object_dir="/var/cache/servo.git/objects")
         .with_python2()
         .with_rustup()
-        # Since macOS workers are long-lived and ~/.rustup kept across tasks:
-        .with_script("rustup self update")
-        .with_script("rustup set profile minimal")
-        # required by components/script_plugins:
-        .with_script("rustup component add rustc-dev")
         .with_index_and_artifacts_expire_in(build_artifacts_expire_in)
         # Debugging for surprising generic-worker behaviour
         .with_early_script("ls")

etc/taskcluster/decisionlib.py

@@ -693,6 +693,7 @@ class MacOsGenericWorkerTask(UnixTaskMixin, GenericWorkerTask):
         return self.with_early_script("""
             export PATH="$HOME/.cargo/bin:$PATH"
             which rustup || curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain none -y
+            rustup self update
         """)
 
 

etc/taskcluster/docker/build.dockerfile

@@ -44,7 +44,8 @@ RUN \
         #
     && \
     #
-    #
+    # Install the version of rustup that is current when this Docker image is being built:
+    # We want at least 1.21 (increment in this comment to force an image rebuild).
     curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain none --profile=minimal -y && \
     #
     #

python/servo/command_base.py

@@ -1009,7 +1009,12 @@ install them, let us know by filing a bug!")
             toolchain = self.rust_toolchain()
 
             if toolchain not in check_output(["rustup", "toolchain", "list"]):
-                check_call(["rustup", "toolchain", "install", toolchain])
+                check_call(["rustup", "toolchain", "install", "--profile", "minimal", toolchain])
+
+            if "rustc-dev" not in check_output(
+                ["rustup", "component", "list", "--installed", "--toolchain", toolchain]
+            ):
+                check_call(["rustup", "component", "add", "--toolchain", toolchain, "rustc-dev"])
 
             if target and "uwp" not in target and target not in check_output(
                 ["rustup", "target", "list", "--installed", "--toolchain", toolchain]
@@ -1029,7 +1034,7 @@ install them, let us know by filing a bug!")
                 return 1
             raise
         version = tuple(map(int, re.match(b"rustup (\d+)\.(\d+)\.(\d+)", version_line).groups()))
-        if version < (1, 11, 0):
+        if version < (1, 21, 0):
             print("rustup is at version %s.%s.%s, Servo requires 1.11.0 or more recent." % version)
             print("Try running 'rustup self update'.")
             return 1

python/servo/devenv_commands.py

@@ -24,7 +24,7 @@ from mach.decorators import (
     Command,
 )
 
-from servo.command_base import CommandBase, cd, call, BIN_SUFFIX
+from servo.command_base import CommandBase, cd, call
 from servo.build_commands import notify_build_done
 from servo.util import get_static_rust_lang_org_dist, get_urlopen_kwargs
 
@@ -213,7 +213,7 @@ class MachCommands(CommandBase):
         filename = path.join(self.context.topdir, "rust-toolchain")
         with open(filename, "w") as f:
             f.write(toolchain + "\n")
-        return call(["rustup" + BIN_SUFFIX, "component", "add", "rustc-dev"])
+        self.ensure_bootstrapped()
 
     @Command('fetch',
              description='Fetch Rust, Cargo and Cargo dependencies',