[Patch 3/3] BaseTools:Remove the unnecessary operation of renaming a file.

[Patch 3/3] BaseTools:Remove the unnecessary operation of renaming a file.

[Bob Feng]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2183

This patch is going to remove rename call to reduce unnecessary
io operation so that saving build time.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
---
 BaseTools/Source/Python/Common/Misc.py | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/BaseTools/Source/Python/Common/Misc.py b/BaseTools/Source/Python/Common/Misc.py
index 15ae6a9e408f..714eb840ea66 100755
--- a/BaseTools/Source/Python/Common/Misc.py
+++ b/BaseTools/Source/Python/Common/Misc.py
@@ -490,17 +490,13 @@ def SaveFileOnChange(File, Content, IsBinaryFile=True, FileLock=None):
     if FileLock:
         FileLock.acquire()
 
 
     if GlobalData.gIsWindows and not os.path.exists(File):
-        # write temp file, then rename the temp file to the real file
-        # to make sure the file be immediate saved to disk
-        with tempfile.NamedTemporaryFile(OpenMode, dir=os.path.dirname(File), delete=False) as tf:
-            tf.write(Content)
-            tempname = tf.name
         try:
-            os.rename(tempname, File)
+            with open(File, OpenMode) as tf:
+                tf.write(Content)
         except IOError as X:
             if GlobalData.gBinCacheSource:
                 EdkLogger.quiet("[cache error]:fails to save file with error: %s" % (X))
             else:
                 EdkLogger.error(None, FILE_CREATE_FAILURE, ExtraData='IOError %s' % X)
@@ -564,25 +560,12 @@ def CopyFileOnChange(SrcFile, Dst, FileLock=None):
     if not FileLock:
         FileLock = GlobalData.file_lock
     if FileLock:
         FileLock.acquire()
 
-    # os.replace and os.rename are the atomic operations in python 3 and 2.
-    # we use these two atomic operations to ensure the file copy is atomic:
-    # copy the src to a temp file in the dst same folder firstly, then
-    # replace or rename the temp file to the destination file.
-    with tempfile.NamedTemporaryFile(dir=DirName, delete=False) as tf:
-        CopyLong(SrcFile, tf.name)
-        tempname = tf.name
     try:
-        if hasattr(os, 'replace'):
-            os.replace(tempname, DstFile)
-        else:
-            # os.rename reqire to remove the dst on Windows, otherwise OSError will be raised.
-            if GlobalData.gIsWindows and os.path.exists(DstFile):
-                os.remove(DstFile)
-            os.rename(tempname, DstFile)
+        CopyLong(SrcFile, DstFile)
     except IOError as X:
         if GlobalData.gBinCacheSource:
             EdkLogger.quiet("[cache error]:fails to copy file with error: %s" % (X))
         else:
             EdkLogger.error(None, FILE_COPY_FAILURE, ExtraData='IOError %s' % X)
-- 
2.20.1.windows.1