commit 67c7cbb9c8441f1e37405d9a16515a1edf43912c
author Tianjie Xu <xunchang@google.com> Thu Aug 30 00:32:07 2018 -0700
committer Tianjie Xu <xunchang@google.com> Wed Oct 03 13:36:35 2018 -0700
tree 0fdf7cb0d0bec0b3ecad0173dfeae41c0cbd3673
parent fabb2c9792d3d837ece05650e80b98b36d4f7d1f

Generate the compute_hash_tree command

Generate the transfer command "compute_hash_tree" for incremental
updates of the non-A/B devices that enable verified boot 1.0

Other changes include:
i.  factor out verity_utils to use both in build_image and blockimgdiff
ii. add a new flag 'hashtree_info_generator' in sparse_image to generate
    the hashtree information.

Bug: 25170618
Test: generate a package for aosp_angler; and run simulator
Change-Id: I4d4d7a3e41dc3da810d2cbf8988e85d187c9ab0e

tools/releasetools/ota_from_target_files.py

diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index e75adf5..755eda9 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -176,6 +176,7 @@
 
 import common
 import edify_generator
+import verity_utils
 
 if sys.hexversion < 0x02070000:
   print("Python 2.7 or newer is required.", file=sys.stderr)
@@ -1411,8 +1412,12 @@
                          target_info.get('ext4_share_dup_blocks') == "true")
   system_src = common.GetSparseImage("system", OPTIONS.source_tmp, source_zip,
                                      allow_shared_blocks)
+
+  hashtree_info_generator = verity_utils.CreateHashtreeInfoGenerator(
+      "system", 4096, target_info)
   system_tgt = common.GetSparseImage("system", OPTIONS.target_tmp, target_zip,
-                                     allow_shared_blocks)
+                                     allow_shared_blocks,
+                                     hashtree_info_generator)
 
   blockimgdiff_version = max(
       int(i) for i in target_info.get("blockimgdiff_versions", "1").split(","))
@@ -1439,8 +1444,11 @@
       raise RuntimeError("can't generate incremental that adds /vendor")
     vendor_src = common.GetSparseImage("vendor", OPTIONS.source_tmp, source_zip,
                                        allow_shared_blocks)
-    vendor_tgt = common.GetSparseImage("vendor", OPTIONS.target_tmp, target_zip,
-                                       allow_shared_blocks)
+    hashtree_info_generator = verity_utils.CreateHashtreeInfoGenerator(
+        "vendor", 4096, target_info)
+    vendor_tgt = common.GetSparseImage(
+        "vendor", OPTIONS.target_tmp, target_zip, allow_shared_blocks,
+        hashtree_info_generator)
 
     # Check first block of vendor partition for remount R/W only if
     # disk type is ext4