最近碰到一个问题，在进行差分升级的时候，会因为某些原因导致preloader hash值不匹配，升级失败，所以需要在差分升级的时候不升级preloader。
解决的方法，就是在制作AB分区的差分升级包的时候，把目标zip解压出来，把ab_partitions.txt中的分区名去掉，同时把preloader.img去掉
修改如下：
Project/build/tools/releasetools/ota_from_target_files.py
METADATA_NAME = 'META-INF/com/android/metadata'
POSTINSTALL_CONFIG = 'META/postinstall_config.txt'
UNZIP_PATTERN = ['IMAGES/*', 'META/*']
AB_PARTITIONS = 'META/ab_partitions.txt'
PRELOADER_STR = "preloader"
......
def RemovePreloaderFromZip(input_file):
target_file = common.MakeTempFile(prefix="targetfiles-", suffix=".zip")
shutil.copyfile(input_file, target_file)
input_tmp = common.UnzipTemp(input_file,UNZIP_PATTERN)
ab_partitions_file = os.path.join(input_tmp,*AB_PARTITIONS.split('/'))
with open(ab_partitions_file) as f:
ab_partitions_lines = f.readlines()
ab_partitions = [line.strip() for line in ab_partitions_lines]
new_ab_partitions = common.MakeTempFile(prefix="ab_partitions", suffix=".txt")
with open(new_ab_partitions, 'w') as f:
for partition in ab_partitions:
if (partition.strip() == PRELOADER_STR.strip()):
continue
f.write(partition + "\n")
to_delete = [AB_PARTITIONS]
to_delete += ['IMAGES/preloader.img']
common.ZipDelete(target_file, to_delete)
target_zip = zipfile.ZipFile(target_file, 'a', allowZip64=True)
common.ZipWrite(target_zip, new_ab_partitions, arcname=AB_PARTITIONS)
common.ZipClose(target_zip)
return target_file
def WriteABOTAPackageWithBrilloScript(target_file, output_file,
source_file=None):
......
def WriteABOTAPackageWithBrilloScript(target_file, output_file,
source_file=None):
if source_file is not None:
target_info = BuildInfo(OPTIONS.target_info_dict, OPTIONS.oem_dicts)
source_info = BuildInfo(OPTIONS.source_info_dict, OPTIONS.oem_dicts)
target_file = RemovePreloaderFromZip(target_file)
else:
