This is for Incremental OTAs only

README.md

@@ -0,0 +1,18 @@
+## System requirement
+
+- Python3, pip
+- google protobuf for python `pip3 install protobuf`
+
+### Full OTA
+
+- LD_LIBRARY_PATH=./lib64/ ./extract.py --output_dir output/ payload.bin
+- This will start to extract the images within the payload.bin file to the output folder you are in.
+
+### Incremental OTA
+
+- Copy original images (from full OTA or dumped from devices) to old folder (with part name without file extension, ex: boot, system)
+- LD_LIBRARY_PATH=./lib64/ ./extract.py --output_dir output/ --old_dir old/ payload.bin
+
+NOTE: this has been fixed for Incremental updates.  Just ensure you use the ROM that was meant to be PATCHED in the old/ directory
+AS THE HASH CHECKS ARE TURNED OFF.  The original project never worked because the HASH of the Incremental update and the prior full ROM
+always had different signatures.  So there is NO ERROR CHECKING HAPPENING.  Works as of 8/2021, tested on Op8T.

add_img_extension_output.sh

@@ -0,0 +1,3 @@
+cd output
+find . -type f -exec mv '{}' '{}'.img \;
+cd ..

extract.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 
 import argparse
 import errno
@@ -18,7 +18,7 @@ def list_content(payload_file_name):
                                          part.new_partition_info.size))
 
 
-def extract(payload_file_name, output_dir="output", partition_names=None):
+def extract(payload_file_name, output_dir="output", old_dir="old", partition_names=None):
     try:
         os.makedirs(output_dir)
     except OSError as e:
@@ -29,28 +29,32 @@ def extract(payload_file_name, output_dir="output", partition_names=None):
         payload = update_payload.Payload(payload_file)
         payload.Init()
 
-        if payload.IsDelta():
-            print("Delta payloads are not supported")
-            exit(1)
-
         helper = applier.PayloadApplier(payload)
         for part in payload.manifest.partitions:
             if partition_names and part.partition_name not in partition_names:
                 continue
             print("Extracting {}".format(part.partition_name))
             output_file = os.path.join(output_dir, part.partition_name)
-            helper._ApplyToPartition(
-                part.operations, part.partition_name,
-                'install_operations', output_file,
-                part.new_partition_info)
-
+            if payload.IsDelta():
+                old_file    = os.path.join(old_dir,    part.partition_name)
+                helper._ApplyToPartition(
+                    part.operations, part.partition_name,
+                    'install_operations', output_file,
+                    part.new_partition_info, old_file, part.old_partition_info)
+            else:
+                helper._ApplyToPartition(
+                    part.operations, part.partition_name,
+                    'install_operations', output_file,
+                    part.new_partition_info)
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument("payload", metavar="payload.bin",
                         help="Path to the payload.bin")
     parser.add_argument("--output_dir", default="output",
                         help="Output directory")
+    parser.add_argument("--old_dir", default="old",
+                        help="Old directory")
     parser.add_argument("--partitions", type=str, nargs='+',
                         help="Name of the partitions to extract")
     parser.add_argument("--list_partitions", action="store_true",
@@ -60,4 +64,4 @@ def extract(payload_file_name, output_dir="output", partition_names=None):
     if args.list_partitions:
         list_content(args.payload)
     else:
-        extract(args.payload, args.output_dir, args.partitions)
+        extract(args.payload, args.output_dir, args.old_dir, args.partitions)

remove_img_extension_old.sh

@@ -0,0 +1,3 @@
+cd old
+for i in ./*.img; do mv -i "$i" "${i%.img}"; done
+cd ..

update_payload/__init__.py

@@ -17,6 +17,8 @@
 """Library for processing, verifying and applying Chrome OS update payloads."""
 
 # Just raise the interface classes to the root namespace.
+from __future__ import absolute_import
+
 from update_payload.checker import CHECKS_TO_DISABLE
 from update_payload.error import PayloadError
 from update_payload.payload import Payload