Add care_map to target_files package

Generate a new file containing care_data of system (and vendor)
partition, and add it under META/ of target file package. For
A/B update, copy this file to OTA package for later use by
update_verifier.

Bug: 27175949

Change-Id: I90bb972703afaeb94bc3efe718fd81b1cfbcabcc

tools/releasetools/add_img_to_target_files.py

@@ -37,6 +37,7 @@ import zipfile
 
 import build_image
 import common
+import sparse_img
 
 OPTIONS = common.OPTIONS
 
@@ -46,6 +47,19 @@ OPTIONS.replace_verity_public_key = False
 OPTIONS.replace_verity_private_key = False
 OPTIONS.verity_signer_path = None
 
+def GetCareMap(which, imgname):
+  """Generate care_map of system (or vendor) partition"""
+
+  assert which in ("system", "vendor")
+  _, blk_device = common.GetTypeAndDevice("/" + which, OPTIONS.info_dict)
+
+  simg = sparse_img.SparseImage(imgname)
+  care_map_list = []
+  care_map_list.append(blk_device)
+  care_map_list.append(simg.care_map.to_string_raw())
+  return care_map_list
+
+
 def AddSystem(output_zip, prefix="IMAGES/", recovery_img=None, boot_img=None):
   """Turn the contents of SYSTEM into a system image and store it in
   output_zip."""
@@ -53,7 +67,7 @@ def AddSystem(output_zip, prefix="IMAGES/", recovery_img=None, boot_img=None):
   prebuilt_path = os.path.join(OPTIONS.input_tmp, prefix, "system.img")
   if os.path.exists(prebuilt_path):
     print "system.img already exists in %s, no need to rebuild..." % (prefix,)
-    return
+    return prebuilt_path
 
   def output_sink(fn, data):
     ofile = open(os.path.join(OPTIONS.input_tmp, "SYSTEM", fn), "w")
@@ -70,6 +84,7 @@ def AddSystem(output_zip, prefix="IMAGES/", recovery_img=None, boot_img=None):
                         block_list=block_list)
   common.ZipWrite(output_zip, imgname, prefix + "system.img")
   common.ZipWrite(output_zip, block_list, prefix + "system.map")
+  return imgname
 
 
 def BuildSystem(input_dir, info_dict, block_list=None):
@@ -103,13 +118,14 @@ def AddVendor(output_zip, prefix="IMAGES/"):
   prebuilt_path = os.path.join(OPTIONS.input_tmp, prefix, "vendor.img")
   if os.path.exists(prebuilt_path):
     print "vendor.img already exists in %s, no need to rebuild..." % (prefix,)
-    return
+    return prebuilt_path
 
   block_list = common.MakeTempFile(prefix="vendor-blocklist-", suffix=".map")
   imgname = BuildVendor(OPTIONS.input_tmp, OPTIONS.info_dict,
                         block_list=block_list)
   common.ZipWrite(output_zip, imgname, prefix + "vendor.img")
   common.ZipWrite(output_zip, block_list, prefix + "vendor.map")
+  return imgname
 
 
 def BuildVendor(input_dir, info_dict, block_list=None):
@@ -139,8 +155,9 @@ def CreateImage(input_dir, info_dict, what, block_list=None):
 
   image_props = build_image.ImagePropFromGlobalDict(info_dict, what)
   fstab = info_dict["fstab"]
-  if fstab:
-    image_props["fs_type"] = fstab["/" + what].fs_type
+  mount_point = "/" + what
+  if fstab and mount_point in fstab:
+    image_props["fs_type"] = fstab[mount_point].fs_type
 
   # Use a fixed timestamp (01/01/2009) when packaging the image.
   # Bug: 24377993
@@ -330,10 +347,12 @@ def AddImagesToTargetFiles(filename):
         recovery_image.AddToZip(output_zip)
 
   banner("system")
-  AddSystem(output_zip, recovery_img=recovery_image, boot_img=boot_image)
+  system_imgname = AddSystem(output_zip, recovery_img=recovery_image,
+                             boot_img=boot_image)
+  vendor_imgname = None
   if has_vendor:
     banner("vendor")
-    AddVendor(output_zip)
+    vendor_imgname = AddVendor(output_zip)
   if has_system_other:
     banner("system_other")
     AddSystemOther(output_zip)
@@ -348,7 +367,19 @@ def AddImagesToTargetFiles(filename):
   if os.path.exists(ab_partitions):
     with open(ab_partitions, 'r') as f:
       lines = f.readlines()
+    # For devices using A/B update, generate care_map for system and vendor
+    # partitions (if present), then write this file to target_files package.
+    care_map_list = []
     for line in lines:
+      if line.strip() == "system" and OPTIONS.info_dict.get(
+          "system_verity_block_device", None) is not None:
+        assert os.path.exists(system_imgname)
+        care_map_list += GetCareMap("system", system_imgname)
+      if line.strip() == "vendor" and OPTIONS.info_dict.get(
+          "vendor_verity_block_device", None) is not None:
+        assert os.path.exists(vendor_imgname)
+        care_map_list += GetCareMap("vendor", vendor_imgname)
+
       img_name = line.strip() + ".img"
       img_radio_path = os.path.join(OPTIONS.input_tmp, "RADIO", img_name)
       if os.path.exists(img_radio_path):
@@ -359,6 +390,10 @@ def AddImagesToTargetFiles(filename):
       img_path = 'IMAGES/' + img_name
       assert img_path in output_zip.namelist(), "cannot find " + img_name
 
+    if care_map_list:
+      file_path = "META/care_map.txt"
+      common.ZipWriteStr(output_zip, file_path, '\n'.join(care_map_list))
+
   common.ZipClose(output_zip)
 
 def main(argv):

tools/releasetools/common.py

@@ -259,11 +259,18 @@ def LoadInfoDict(input_file, input_dir=None):
   makeint("boot_size")
   makeint("fstab_version")
 
-  if d.get("no_recovery", False) == "true":
-    d["fstab"] = None
-  else:
+  system_root_image = d.get("system_root_image", None) == "true"
+  if d.get("no_recovery", None) != "true":
+    recovery_fstab_path = "RECOVERY/RAMDISK/etc/recovery.fstab"
     d["fstab"] = LoadRecoveryFSTab(read_helper, d["fstab_version"],
-                                   d.get("system_root_image", False))
+        recovery_fstab_path, system_root_image)
+  elif d.get("recovery_as_boot", None) == "true":
+    recovery_fstab_path = "BOOT/RAMDISK/etc/recovery.fstab"
+    d["fstab"] = LoadRecoveryFSTab(read_helper, d["fstab_version"],
+        recovery_fstab_path, system_root_image)
+  else:
+    d["fstab"] = None
+
   d["build.prop"] = LoadBuildProp(read_helper)
   return d
 
@@ -286,7 +293,8 @@ def LoadDictionaryFromLines(lines):
       d[name] = value
   return d
 
-def LoadRecoveryFSTab(read_helper, fstab_version, system_root_image=False):
+def LoadRecoveryFSTab(read_helper, fstab_version, recovery_fstab_path,
+                      system_root_image=False):
   class Partition(object):
     def __init__(self, mount_point, fs_type, device, length, device2, context):
       self.mount_point = mount_point
@@ -297,9 +305,9 @@ def LoadRecoveryFSTab(read_helper, fstab_version, system_root_image=False):
       self.context = context
 
   try:
-    data = read_helper("RECOVERY/RAMDISK/etc/recovery.fstab")
+    data = read_helper(recovery_fstab_path)
   except KeyError:
-    print "Warning: could not find RECOVERY/RAMDISK/etc/recovery.fstab"
+    print "Warning: could not find {}".format(recovery_fstab_path)
     data = ""
 
   if fstab_version == 1:

tools/releasetools/ota_from_target_files.py

@@ -1314,6 +1314,19 @@ def WriteABOTAPackageWithBrilloScript(target_file, output_file,
                   compress_type=zipfile.ZIP_STORED)
   WriteMetadata(metadata, output_zip)
 
+  # If dm-verity is supported for the device, copy contents of care_map
+  # into A/B OTA package.
+  if OPTIONS.info_dict.get("verity") == "true":
+    target_zip = zipfile.ZipFile(target_file, "r")
+    care_map_path = "META/care_map.txt"
+    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)
+    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.
   common.ZipClose(output_zip)
   SignOutput(temp_zip_file.name, output_file)