jenkins: improve x64 node.exe caching for arm64

jenkins/scripts/windows/compile.cmd

@@ -1,3 +1,5 @@
+SETLOCAL EnableDelayedExpansion
+
 :: Use Python 2 up to Node 12
 if %NODEJS_MAJOR_VERSION% leq 12 set "PATH=C:\Python27\;C:\Python27\Scripts;%PATH%"
 
@@ -35,15 +37,59 @@ if "%nodes:~-6%" == "-arm64" (
     :: thus failing the build after timing out (1-2% runs).
     :: Downloading it from here and updating it weekly should
     :: decrease, if not remove, these types of CI failures.
-    :: Download and cache x64 node.exe.
-    mkdir C:\node_exe_cache
-    forfiles /p "C:\node_exe_cache" /m "node.exe" /d -7 /c "cmd /c del @path"
-    if not exist C:\node_exe_cache\node.exe (
-      curl -L https://nodejs.org/dist/latest/win-x64/node.exe -o C:\node_exe_cache\node.exe
+    :: 1. Make node_exe_cache directory if it doesn't exist.
+    if not exist C:\node_exe_cache (
+      mkdir C:\node_exe_cache
+    )
+    :: 2. Check if node.exe exists and if it's older then 7 days.
+    set NODE_CACHED=False
+    set CACHE_INVALID=False
+    if exist C:\node_exe_cache\node.exe (
+      set NODE_CACHED=True
+      forfiles /p "C:\node_exe_cache" /m "node.exe" /d -7 && set CACHE_INVALID=True
+    )
+    :: 3. If node.exe didn't exist, or was older then 7 days, download the new one and check it's validity.
+    set SHOULD_DOWNLOAD=False
+    if !NODE_CACHED! == False set SHOULD_DOWNLOAD=True
+    if !CACHE_INVALID! == True set SHOULD_DOWNLOAD=True
+    set VALID_SHASUM=
+    set DOWNLOAD_SHASUM=
+    if !SHOULD_DOWNLOAD! == True (
+      :: 3.1. Download SHASUMS and find value for "win-x64/node.exe".
+      ver > nul
+      curl -L https://nodejs.org/dist/latest/SHASUMS256.txt -o C:\node_exe_cache\SHASUMS256.txt
+      if not !errorlevel! == 0 goto download_cleanup
+      for /f %%a in ('findstr win-x64/node.exe C:\node_exe_cache\SHASUMS256.txt') do set VALID_SHASUM=%%a
+      if [!VALID_SHASUM!] == [] goto download_cleanup
+      :: 3.2. Download win-x64/node.exe and calculate its SHASUM.
+      ver > nul
+      curl -L https://nodejs.org/dist/latest/win-x64/node.exe -o C:\node_exe_cache\node_new.exe
+      if not !errorlevel! == 0 goto download_cleanup
+      for /f %%a in ('certutil -hashfile C:\node_exe_cache\node_new.exe SHA256 ^| find /v ":"') do set DOWNLOAD_SHASUM=%%a
+      if [!DOWNLOAD_SHASUM!] == [] goto download_cleanup
+      :: 3.3. Check if downloaded file is valid. If yes, delete old one. If not, delete new one.
+      if !VALID_SHASUM! == !DOWNLOAD_SHASUM! (
+        if exist C:\node_exe_cache\node.exe (
+          del C:\node_exe_cache\node.exe
+        )
+        ren C:\node_exe_cache\node_new.exe node.exe
+      )
+      :: 3.4. Clean up all of the temporary files.
+:download_cleanup
+      if exist C:\node_exe_cache\SHASUMS256.txt (
+        del C:\node_exe_cache\SHASUMS256.txt
+      )
+      if exist C:\node_exe_cache\node_new.exe (
+        del C:\node_exe_cache\node_new.exe
+      )
+    )
+    :: 4. Copy the latest valid node, if any, to where vcbuild expects it to be
+    if exist C:\node_exe_cache\node.exe (
+      if not exist temp-vcbuild (
+        mkdir temp-vcbuild
+      )
+      copy C:\node_exe_cache\node.exe temp-vcbuild\node-x64-cross-compiling.exe
     )
-    :: Copy it to where vcbuild expects.
-    mkdir temp-vcbuild
-    copy C:\node_exe_cache\node.exe temp-vcbuild\node-x64-cross-compiling.exe
   )
 ) else if "%nodes:~-4%" == "-x86" (
   set "VCBUILD_EXTRA_ARGS=x86 %VCBUILD_EXTRA_ARGS%"