Add option to enable lz4diff
When lz4diff is enabled, we inject the host copy of liblz4.so in
target_file to delta_generator. This is to ensure that host tooling can
produce same compressed output as the device.
Test: th
Bug: 206729162
Change-Id: I2d8206f7ec54fadedea16bf3d811b8353bc9414d
diff --git a/tools/releasetools/ota_utils.py b/tools/releasetools/ota_utils.py
index a4ec9e2..6896f83 100644
--- a/tools/releasetools/ota_utils.py
+++ b/tools/releasetools/ota_utils.py
@@ -640,6 +640,28 @@
return target_apex_proto.SerializeToString()
+def IsLz4diffCompatible(source_file: str, target_file: str):
+ """Check whether lz4diff versions in two builds are compatible
+
+ Args:
+ source_file: Path to source build's target_file.zip
+ target_file: Path to target build's target_file.zip
+
+ Returns:
+ bool true if and only if lz4diff versions are compatible
+ """
+ if source_file is None or target_file is None:
+ return False
+ # Right now we enable lz4diff as long as source build has liblz4.so.
+ # In the future we might introduce version system to lz4diff as well.
+ if zipfile.is_zipfile(source_file):
+ with zipfile.ZipFile(source_file, "r") as zfp:
+ return "META/liblz4.so" in zfp.namelist()
+ else:
+ assert os.path.isdir(source_file)
+ return os.path.exists(os.path.join(source_file, "META", "liblz4.so"))
+
+
def IsZucchiniCompatible(source_file: str, target_file: str):
"""Check whether zucchini versions in two builds are compatible