Bug 1577049 - Provide sccache and dist-toolchains during bootstrap on Windows. r=froydnj

Differential Revision: https://phabricator.services.mozilla.com/D43700

--HG--
extra : moz-landing-system : lando

python/mozboot/mozboot/mozillabuild.py

@@ -100,6 +100,17 @@ class MozillaBuildBootstrapper(BaseBootstrapper):
         self.install_toolchain_static_analysis(
             state_dir, checkout_root, static_analysis.WINDOWS_CLANG_TIDY)
 
+    def ensure_sccache_packages(self, state_dir, checkout_root):
+        from mozboot import sccache
+
+        self.install_toolchain_artifact(state_dir, checkout_root, sccache.WIN64_SCCACHE)
+        self.install_toolchain_artifact(state_dir, checkout_root,
+                                        sccache.RUSTC_DIST_TOOLCHAIN,
+                                        no_unpack=True)
+        self.install_toolchain_artifact(state_dir, checkout_root,
+                                        sccache.CLANG_DIST_TOOLCHAIN,
+                                        no_unpack=True)
+
     def ensure_stylo_packages(self, state_dir, checkout_root):
         # On-device artifact builds are supported; on-device desktop builds are not.
         if is_aarch64_host():

python/mozboot/mozboot/sccache.py

@@ -6,5 +6,10 @@ from __future__ import absolute_import, print_function, unicode_literals
 
 LINUX_SCCACHE = 'linux64-sccache'
 MACOS_SCCACHE = 'macosx64-sccache'
+WIN64_SCCACHE = 'win64-sccache'
+
+# sccache-dist currently expects clients to provide toolchains when
+# distributing from macOS or Windows, so we download linux binaries capable
+# of cross-compiling for these cases.
 RUSTC_DIST_TOOLCHAIN = 'rustc-dist-toolchain'
 CLANG_DIST_TOOLCHAIN = 'clang-dist-toolchain'