source_file=None):
"""Generate an Android OTA package that has A/B update payload."""
+ def ComputeStreamingMetadata(zip_file):
+ """Compute the streaming metadata for a given zip."""
+
+ def ComputeEntryOffsetSize(name):
+ """Compute the zip entry offset and size."""
+ info = zip_file.getinfo(name)
+ offset = info.header_offset + len(info.FileHeader())
+ size = info.file_size
+ return '%s:%d:%d' % (name, offset, size)
+
+ offsets = [ComputeEntryOffsetSize('payload.bin'),
+ ComputeEntryOffsetSize('payload_properties.txt'),
+ ComputeEntryOffsetSize('care_map.txt')]
+ return ','.join(offsets)
+
# The place where the output from the subprocess should go.
log_file = sys.stdout if OPTIONS.verbose else subprocess.PIPE
f.write("POWERWASH=1\n")
metadata["ota-wipe"] = "yes"
- # Add the signed payload file and properties into the zip.
- common.ZipWrite(output_zip, properties_file, arcname="payload_properties.txt")
+ # Add the signed payload file and properties into the zip. In order to
+ # support streaming, we pack payload.bin, payload_properties.txt and
+ # care_map.txt as ZIP_STORED. So these entries can be read directly with
+ # the offset and length pairs.
common.ZipWrite(output_zip, signed_payload_file, arcname="payload.bin",
compress_type=zipfile.ZIP_STORED)
- WriteMetadata(metadata, output_zip)
+ common.ZipWrite(output_zip, properties_file,
+ arcname="payload_properties.txt",
+ compress_type=zipfile.ZIP_STORED)
# If dm-verity is supported for the device, copy contents of care_map
# into A/B OTA package.
namelist = target_zip.namelist()
if care_map_path in namelist:
care_map_data = target_zip.read(care_map_path)
- common.ZipWriteStr(output_zip, "care_map.txt", care_map_data)
+ common.ZipWriteStr(output_zip, "care_map.txt", care_map_data,
+ compress_type=zipfile.ZIP_STORED)
else:
print("Warning: cannot find care map file in target_file package")
common.ZipClose(target_zip)
- # Sign the whole package to comply with the Android OTA package format.
+ # SignOutput(), which in turn calls signapk.jar, will possibly reorder the
+ # zip entries, as well as padding the entry headers. We sign the current
+ # package (without the metadata entry) to allow that to happen. Then compute
+ # the zip entry offsets, write the metadata and do the signing again.
common.ZipClose(output_zip)
- SignOutput(temp_zip_file.name, output_file)
+ temp_signing = tempfile.NamedTemporaryFile()
+ SignOutput(temp_zip_file.name, temp_signing.name)
temp_zip_file.close()
+ # Open the signed zip. Compute the metadata that's needed for streaming.
+ output_zip = zipfile.ZipFile(temp_signing, "a",
+ compression=zipfile.ZIP_DEFLATED)
+ metadata['streaming-property-files'] = ComputeStreamingMetadata(output_zip)
+
+ # Write the metadata entry into the zip.
+ WriteMetadata(metadata, output_zip)
+ common.ZipClose(output_zip)
+
+ # Re-sign the package after adding the metadata entry, which should not
+ # affect the entries that are needed for streaming. Because signapk packs
+ # ZIP_STORED entries first, then the ZIP_DEFLATED entries such as metadata.
+ SignOutput(temp_signing.name, output_file)
+ temp_signing.close()
+
+ # Reopen the signed zip to double check the streaming metadata.
+ output_zip = zipfile.ZipFile(output_file, "r")
+ assert (metadata['streaming-property-files'] ==
+ ComputeStreamingMetadata(output_zip)), \
+ "Mismatching streaming metadata."
+ common.ZipClose(output_zip)
+
class FileDifference(object):
def __init__(self, partition, source_zip, target_zip, output_zip):