tools/setup: don't download sccache if --no-binary-download is passed

tools/prebuilt.py

@@ -18,23 +18,22 @@ def download_prebuilt(sha1_file):
         env=google_env())
 
 
-def load_sccache():
+def get_platform_path(tool):
     if sys.platform == 'win32':
-        p = "prebuilt/win/sccache.exe"
+        return "prebuilt/win/" + tool + ".exe"
     elif sys.platform.startswith('linux'):
-        p = "prebuilt/linux64/sccache"
+        return "prebuilt/linux64/" + tool
     elif sys.platform == 'darwin':
-        p = "prebuilt/mac/sccache"
+        return "prebuilt/mac/" + tool
+
+
+def load_sccache():
+    p = get_platform_path("sccache")
     download_prebuilt(p + ".sha1")
     return os.path.join(root_path, p)
 
 
 def load_hyperfine():
-    if sys.platform == 'win32':
-        p = "prebuilt/win/hyperfine.exe"
-    elif sys.platform.startswith('linux'):
-        p = "prebuilt/linux64/hyperfine"
-    elif sys.platform == 'darwin':
-        p = "prebuilt/mac/hyperfine"
+    p = get_platform_path("hyperfine")
     download_prebuilt(p + ".sha1")
     return os.path.join(root_path, p)

tools/setup.py

@@ -31,6 +31,7 @@ def main():
         third_party.download_clang_format()
         third_party.download_clang()
         third_party.maybe_download_sysroot()
+        prebuilt.load_sccache()
 
     write_lastchange()
 
@@ -125,7 +126,7 @@ def generate_gn_args(mode):
     if "DENO_BUILD_ARGS" in os.environ:
         out += os.environ["DENO_BUILD_ARGS"].split()
 
-    cacher = prebuilt.load_sccache()
+    cacher = os.path.join(root_path, prebuilt.get_platform_path("sccache"))
     if not os.path.exists(cacher):
         cacher = find_executable("sccache") or find_executable("ccache")