Disable imgdiff for non-AB OTA
imgdiff assumes that libz produces identical output across different
platforms, which is sometimes not the case. This causes incremental OTA
on non-AB targets to fail ocassionally. For stability, disable imgdiff.
Test: th
Bug: 265895599
Change-Id: I92d09a50762ec69a79caa37ed4d6e0db1ec8a47a
diff --git a/tools/releasetools/non_ab_ota.py b/tools/releasetools/non_ab_ota.py
index 44bac28..7078d67 100644
--- a/tools/releasetools/non_ab_ota.py
+++ b/tools/releasetools/non_ab_ota.py
@@ -48,17 +48,12 @@
# if the filesystem is ext4.
partition_source_info = source_info["fstab"]["/" + name]
check_first_block = partition_source_info.fs_type == "ext4"
- # Disable using imgdiff for squashfs. 'imgdiff -z' expects input files to be
- # in zip formats. However with squashfs, a) all files are compressed in LZ4;
- # b) the blocks listed in block map may not contain all the bytes for a
- # given file (because they're rounded to be 4K-aligned).
- partition_target_info = target_info["fstab"]["/" + name]
- disable_imgdiff = (partition_source_info.fs_type == "squashfs" or
- partition_target_info.fs_type == "squashfs")
+ # Disable imgdiff because it relies on zlib to produce stable output
+ # across different versions, which is often not the case.
return common.BlockDifference(name, partition_tgt, partition_src,
check_first_block,
version=blockimgdiff_version,
- disable_imgdiff=disable_imgdiff)
+ disable_imgdiff=True)
if source_zip:
# See notes in common.GetUserImage()
@@ -409,7 +404,7 @@
if updating_boot:
boot_type, boot_device_expr = common.GetTypeAndDeviceExpr("/boot",
source_info)
- d = common.Difference(target_boot, source_boot)
+ d = common.Difference(target_boot, source_boot, "bsdiff")
_, _, d = d.ComputePatch()
if d is None:
include_full_boot = True