Clean up emscripten state when updating

We should clear the old version once we try to update the to a
new one else old files may linger

Bug: none
Change-Id: Ieb15ab58b454bff877431499cefbf5bb6e619a02
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6243826
Auto-Submit: Nikolay Vitkov <[email protected]>
Commit-Queue: Nikolay Vitkov <[email protected]>
Reviewed-by: Liviu Rau <[email protected]>

Author: Lightning00Blade

scripts/deps/download_emscripten.py

@@ -11,6 +11,7 @@
 import argparse
 import os
 import platform
+import shutil
 import sys
 import tarfile
 import urllib.request
@@ -21,10 +22,12 @@
 DOWNLOAD_URL = "https://storage.googleapis.com/webassembly/emscripten-releases-builds/%s/%s/wasm-binaries%s.%s"
 
 
+# Returns None when files was not found
+# Return boolean if file found depending on version is the same
 def check_stamp_file(options, url):
     file_name = os.path.join(options.dest, STAMP_FILE)
     if not os.path.isfile(file_name):
-        return False
+        return None
     with open(file_name) as f:
         return url == f.read().strip()
 
@@ -64,8 +67,14 @@ def script_main(args):
 
     url = DOWNLOAD_URL % (os_name, options.tag, arch_suffix, file_extension)
 
-    if check_stamp_file(options, url):
+    build_revision_same = check_stamp_file(options, url)
+    if build_revision_same:
         return 0
+    elif build_revision_same is False:
+        try:
+            shutil.rmtree(os.path.join(options.dest, 'install'))
+        except Exception as e:
+            sys.stderr.write('Error while remove old version: {e}'.format(e=e))
 
     try:
         filename, _ = urllib.request.urlretrieve(url)