Merge "Unsparse images before generating OTA" am: b4406d06f0

Original change: https://android-review.googlesource.com/c/platform/build/+/2598008

Change-Id: I40ac20dd7b30d11e1eda77688718566af4c1c416
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

tools/releasetools/common.py

@@ -2792,6 +2792,8 @@ def MakeTempDir(prefix='tmp', suffix=''):
 
 def Cleanup():
   for i in OPTIONS.tempfiles:
+    if not os.path.exists(i):
+      continue
     if os.path.isdir(i):
       shutil.rmtree(i, ignore_errors=True)
     else:
@@ -4127,6 +4129,17 @@ def IsSparseImage(filepath):
     return fp.read(4) == b'\x3A\xFF\x26\xED'
 
 
+def UnsparseImage(filepath, target_path=None):
+  if not IsSparseImage(filepath):
+    return
+  if target_path is None:
+    tmp_img = MakeTempFile(suffix=".img")
+    RunAndCheckOutput(["simg2img", filepath, tmp_img])
+    os.rename(tmp_img, filepath)
+  else:
+    RunAndCheckOutput(["simg2img", filepath, target_path])
+
+
 def ParseUpdateEngineConfig(path: str):
   """Parse the update_engine config stored in file `path`
   Args