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fallback on older cow version

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If a device's source or target cow version is specified at 2 (or
undefined) we should fallback on using the v2 writer.

e.g.
1. v3 -> v2 downgrade OTA
2. v2 -> v3

Bug: 322279333
Test: ota_from_target_files
Change-Id: I8c5139eceeb64ee255ddea66017b3e17bbdc44c0
This commit is contained in:
Daniel Zheng
2024-02-28 12:59:52 -08:00
parent e6045f8b74
commit 474afa8f06
2 changed files with 14 additions and 0 deletions
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10
tools/releasetools/ota_from_target_files.py
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@@ -908,6 +908,16 @@ def GenerateAbOtaPackage(target_file, output_file, source_file=None):
source_info.vabc_compression_param, target_info.vabc_compression_param, source_info.vabc_compression_param))
vabc_compression_param = source_info.vabc_compression_param
# Virtual AB Cow version 3 is introduced in Android U with improved memory
# and install time performance. All OTA's with
# both the source build and target build with VIRTUAL_AB_COW_VERSION = 3
# can support the new format. Otherwise, fallback on older versions
if not source_info.vabc_cow_version or not target_info.vabc_cow_version:
logger.info("Source or Target doesn't have VABC_COW_VERSION specified, default to version 2")
OPTIONS.vabc_cow_version = 2
elif source_info.vabc_cow_version != target_info.vabc_cow_version:
logger.info("Source and Target have different cow VABC_COW_VERSION specified, default to minimum version")
OPTIONS.vabc_cow_version = min(source_info.vabc_cow_version, target_info.vabc_cow_version)
# Virtual AB Compression was introduced in Androd S.
# Later, we backported VABC to Android R. But verity support was not
# backported, so if VABC is used and we are on Android R, disable