android OTA修改

http://blog.csdn.net/cupidove/article/details/9370545
版权声明：本文为博主原创文章，未经博主允许不得转载。

def WriteFullOTAPackage(input_zip, output_zip):
  # TODO: how to determine this?  We don't know what version it will
  # be installed on top of.  For now, we expect the API just won't
  # change very often.
  script = edify_generator.EdifyGenerator(3, OPTIONS.info_dict)

  metadata = {"post-build": GetBuildProp("ro.build.fingerprint",
                                         OPTIONS.info_dict),
              "pre-device": GetBuildProp("ro.product.device",
                                         OPTIONS.info_dict),
              "post-timestamp": GetBuildProp("ro.build.date.utc",
                                             OPTIONS.info_dict),
              }

  device_specific = common.DeviceSpecificParams(
      input_zip=input_zip,
      input_version=OPTIONS.info_dict["recovery_api_version"],
      output_zip=output_zip,
      script=script,
      input_tmp=OPTIONS.input_tmp,
      metadata=metadata,
      info_dict=OPTIONS.info_dict)

  if not OPTIONS.omit_prereq:
    ts = GetBuildProp("ro.build.date.utc", OPTIONS.info_dict)
    script.AssertOlderBuild(ts)

  AppendAssertions(script, OPTIONS.info_dict)
  device_specific.FullOTA_Assertions()
  device_specific.FullOTA_InstallBegin()

  script.ShowProgress(0.5, 0)
  device_specific.Install_Parameter()

  if OPTIONS.wipe_user_data:
    script.FormatPartition("/data")

  if "selinux_fc" in OPTIONS.info_dict:
    WritePolicyConfig(OPTIONS.info_dict["selinux_fc"], output_zip)

  script.FormatPartition("/system")
  script.Mount("/system")
  script.UnpackPackageDir("recovery", "/system")
  script.UnpackPackageDir("system", "/system")

  symlinks = CopySystemFiles(input_zip, output_zip)
  script.MakeSymlinks(symlinks)

  boot_img = common.GetBootableImage("boot.img", "boot.img",
                                     OPTIONS.input_tmp, "BOOT")
  recovery_img = common.GetBootableImage("recovery.img", "recovery.img",
                                         OPTIONS.input_tmp, "RECOVERY")
  MakeRecoveryPatch(OPTIONS.input_tmp, output_zip, recovery_img, boot_img)

  Item.GetMetadata(input_zip)
  Item.Get("system").SetPermissions(script)

  common.CheckSize(boot_img.data, "boot.img", OPTIONS.info_dict)
  common.ZipWriteStr(output_zip, "boot.img", boot_img.data)
  script.ShowProgress(0.2, 0)

  script.ShowProgress(0.2, 10)
  script.WriteRawImage("/boot", "boot.img")

  script.ShowProgress(0.1, 0)
  device_specific.FullOTA_InstallEnd()

  if OPTIONS.extra_script is not None:
    script.AppendExtra(OPTIONS.extra_script)

  script.UnmountAll()
  script.AddToZip(input_zip, output_zip)
  WriteMetadata(metadata, output_zip)

如果想把recovery.img全部烧录而不产生差分包

# MakeRecoveryPatch(OPTIONS.input_tmp, output_zip, recovery_img, boot_img)//

common.CheckSize(recovery_img.data, "recovery.img", OPTIONS.info_dict)

common.ZipWriteStr(output_zip, "recovery.img", recovery_img.data)

script.WriteRawImage("/recovery", "recovery.img")

def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
  source_version = OPTIONS.source_info_dict["recovery_api_version"]
  target_version = OPTIONS.target_info_dict["recovery_api_version"]

  if source_version == 0:
    print ("WARNING: generating edify script for a source that "
           "can't install it.")
  script = edify_generator.EdifyGenerator(source_version,
                                          OPTIONS.target_info_dict)

  metadata = {"pre-device": GetBuildProp("ro.product.device",
                                         OPTIONS.source_info_dict),
              "post-timestamp": GetBuildProp("ro.build.date.utc",
                                             OPTIONS.target_info_dict),
              }

  device_specific = common.DeviceSpecificParams(
      source_zip=source_zip,
      source_version=source_version,
      target_zip=target_zip,
      target_version=target_version,
      output_zip=output_zip,
      script=script,
      metadata=metadata,
      info_dict=OPTIONS.info_dict)

  print "Loading target..."
  target_data = LoadSystemFiles(target_zip)
  print "Loading source..."
  source_data = LoadSystemFiles(source_zip)

  verbatim_targets = []
  patch_list = []
  diffs = []
  largest_source_size = 0
  for fn in sorted(target_data.keys()):
    tf = target_data[fn]
    assert fn == tf.name
    sf = source_data.get(fn, None)

    if sf is None or fn in OPTIONS.require_verbatim:
      # This file should be included verbatim
      if fn in OPTIONS.prohibit_verbatim:
        raise common.ExternalError("\"%s\" must be sent verbatim" % (fn,))
      print "send", fn, "verbatim"
      tf.AddToZip(output_zip)
      verbatim_targets.append((fn, tf.size))
    elif tf.sha1 != sf.sha1:
      # File is different; consider sending as a patch
      diffs.append(common.Difference(tf, sf))
    else:
      # Target file identical to source.
      pass

  common.ComputeDifferences(diffs)

  for diff in diffs:
    tf, sf, d = diff.GetPatch()
    if d is None or len(d) > tf.size * OPTIONS.patch_threshold:
      # patch is almost as big as the file; don't bother patching
      tf.AddToZip(output_zip)
      verbatim_targets.append((tf.name, tf.size))
    else:
      common.ZipWriteStr(output_zip, "patch/" + tf.name + ".p", d)
      patch_list.append((tf.name, tf, sf, tf.size, common.sha1(d).hexdigest()))
      largest_source_size = max(largest_source_size, sf.size)

  source_fp = GetBuildProp("ro.build.fingerprint", OPTIONS.source_info_dict)
  target_fp = GetBuildProp("ro.build.fingerprint", OPTIONS.target_info_dict)
  metadata["pre-build"] = source_fp
  metadata["post-build"] = target_fp

  script.Mount("/system")
  script.AssertSomeFingerprint(source_fp, target_fp)

  source_boot = common.GetBootableImage(
      "/tmp/boot.img", "boot.img", OPTIONS.source_tmp, "BOOT",
      OPTIONS.source_info_dict)
  target_boot = common.GetBootableImage(
      "/tmp/boot.img", "boot.img", OPTIONS.target_tmp, "BOOT")
  updating_boot = (source_boot.data != target_boot.data)

  source_recovery = common.GetBootableImage(
      "/tmp/recovery.img", "recovery.img", OPTIONS.source_tmp, "RECOVERY",
      OPTIONS.source_info_dict)
  target_recovery = common.GetBootableImage(
      "/tmp/recovery.img", "recovery.img", OPTIONS.target_tmp, "RECOVERY")
  updating_recovery = (source_recovery.data != target_recovery.data)

  # Here's how we divide up the progress bar:
  #  0.1 for verifying the start state (PatchCheck calls)
  #  0.8 for applying patches (ApplyPatch calls)
  #  0.1 for unpacking verbatim files, symlinking, and doing the
  #      device-specific commands.

  AppendAssertions(script, OPTIONS.target_info_dict)
  device_specific.IncrementalOTA_Assertions()

  script.Print("Verifying current system...")

  device_specific.IncrementalOTA_VerifyBegin()

  script.ShowProgress(0.1, 0)
  total_verify_size = float(sum([i[2].size for i in patch_list]) + 1)
  if updating_boot:
    total_verify_size += source_boot.size
  so_far = 0

  for fn, tf, sf, size, patch_sha in patch_list:
    script.PatchCheck("/"+fn, tf.sha1, sf.sha1)
    so_far += sf.size
    script.SetProgress(so_far / total_verify_size)

  if updating_boot:
    d = common.Difference(target_boot, source_boot)
    _, _, d = d.ComputePatch()
    print "boot      target: %d  source: %d  diff: %d" % (
        target_boot.size, source_boot.size, len(d))

    common.ZipWriteStr(output_zip, "patch/boot.img.p", d)

    boot_type, boot_device = common.GetTypeAndDevice("/boot", OPTIONS.info_dict)

    script.PatchCheck("%s:%s:%d:%s:%d:%s" %
                      (boot_type, boot_device,
                       source_boot.size, source_boot.sha1,
                       target_boot.size, target_boot.sha1))
    so_far += source_boot.size
    script.SetProgress(so_far / total_verify_size)

  if patch_list or updating_recovery or updating_boot:
    script.CacheFreeSpaceCheck(largest_source_size)

  device_specific.IncrementalOTA_VerifyEnd()

  script.Comment("---- start making changes here ----")

  device_specific.IncrementalOTA_InstallBegin()

  if OPTIONS.wipe_user_data:
    script.Print("Erasing user data...")
    script.FormatPartition("/data")

  script.Print("Removing unneeded files...")
  script.DeleteFiles(["/"+i[0] for i in verbatim_targets] +
                     ["/"+i for i in sorted(source_data)
                            if i not in target_data] +
                     ["/system/recovery.img"])

  script.ShowProgress(0.8, 0)
  total_patch_size = float(sum([i[1].size for i in patch_list]) + 1)
  if updating_boot:
    total_patch_size += target_boot.size
  so_far = 0

  script.Print("Patching system files...")
  deferred_patch_list = []
  for item in patch_list:
    fn, tf, sf, size, _ = item
    if tf.name == "system/build.prop":
      deferred_patch_list.append(item)
      continue
    script.ApplyPatch("/"+fn, "-", tf.size, tf.sha1, sf.sha1, "patch/"+fn+".p")
    so_far += tf.size
    script.SetProgress(so_far / total_patch_size)

  if updating_boot:
    # Produce the boot image by applying a patch to the current
    # contents of the boot partition, and write it back to the
    # partition.
    script.Print("Patching boot image...")
    script.ApplyPatch("%s:%s:%d:%s:%d:%s"
                      % (boot_type, boot_device,
                         source_boot.size, source_boot.sha1,
                         target_boot.size, target_boot.sha1),
                      "-",
                      target_boot.size, target_boot.sha1,
                      source_boot.sha1, "patch/boot.img.p")
    so_far += target_boot.size
    script.SetProgress(so_far / total_patch_size)
    print "boot image changed; including."
  else:
    print "boot image unchanged; skipping."

  if updating_recovery:
    # Recovery is generated as a patch using both the boot image
    # (which contains the same linux kernel as recovery) and the file
    # /system/etc/recovery-resource.dat (which contains all the images
    # used in the recovery UI) as sources.  This lets us minimize the
    # size of the patch, which must be included in every OTA package.
    #
    # For older builds where recovery-resource.dat is not present, we
    # use only the boot image as the source.

    MakeRecoveryPatch(OPTIONS.target_tmp, output_zip,
                      target_recovery, target_boot)
    script.DeleteFiles(["/system/recovery-from-boot.p",
                        "/system/etc/install-recovery.sh"])
    print "recovery image changed; including as patch from boot."
  else:
    print "recovery image unchanged; skipping."

  script.ShowProgress(0.1, 10)

  target_symlinks = CopySystemFiles(target_zip, None)

  target_symlinks_d = dict([(i[1], i[0]) for i in target_symlinks])
  temp_script = script.MakeTemporary()
  Item.GetMetadata(target_zip)
  Item.Get("system").SetPermissions(temp_script)

  # Note that this call will mess up the tree of Items, so make sure
  # we're done with it.
  source_symlinks = CopySystemFiles(source_zip, None)
  source_symlinks_d = dict([(i[1], i[0]) for i in source_symlinks])

  # Delete all the symlinks in source that aren't in target.  This
  # needs to happen before verbatim files are unpacked, in case a
  # symlink in the source is replaced by a real file in the target.
  to_delete = []
  for dest, link in source_symlinks:
    if link not in target_symlinks_d:
      to_delete.append(link)
  script.DeleteFiles(to_delete)

  if verbatim_targets:
    script.Print("Unpacking new files...")
    script.UnpackPackageDir("system", "/system")

  if updating_recovery:
    script.Print("Unpacking new recovery...")
    script.UnpackPackageDir("recovery", "/system")

  script.Print("Symlinks and permissions...")

  # Create all the symlinks that don't already exist, or point to
  # somewhere different than what we want.  Delete each symlink before
  # creating it, since the 'symlink' command won't overwrite.
  to_create = []
  for dest, link in target_symlinks:
    if link in source_symlinks_d:
      if dest != source_symlinks_d[link]:
        to_create.append((dest, link))
    else:
      to_create.append((dest, link))
  script.DeleteFiles([i[1] for i in to_create])
  script.MakeSymlinks(to_create)

  # Now that the symlinks are created, we can set all the
  # permissions.
  script.AppendScript(temp_script)

  # Do device-specific installation (eg, write radio image).
  device_specific.IncrementalOTA_InstallEnd()

  if OPTIONS.extra_script is not None:
    script.AppendExtra(OPTIONS.extra_script)

  # Patch the build.prop file last, so if something fails but the
  # device can still come up, it appears to be the old build and will
  # get set the OTA package again to retry.
  script.Print("Patching remaining system files...")
  for item in deferred_patch_list:
    fn, tf, sf, size, _ = item
    script.ApplyPatch("/"+fn, "-", tf.size, tf.sha1, sf.sha1, "patch/"+fn+".p")
  script.SetPermissions("/system/build.prop", 0, 0, 0644)

  script.AddToZip(target_zip, output_zip)
  WriteMetadata(metadata, output_zip)

差分包把recovery.img完全烧录，而不产生差分，修改地方

#if updating_boot:
  #  total_verify_size += source_boot.size
  #  d = common.Difference(target_boot, source_boot)
  #  _, _, d = d.ComputePatch()
  #  print "boot      target: %d  source: %d  diff: %d" % (
  #      target_boot.size, source_boot.size, len(d))
  #  common.ZipWriteStr(output_zip, "patch/boot.img.p", d)
  #  boot_type, boot_device = common.GetTypeAndDevice("/boot", OPTIONS.info_dict)
  #  script.PatchCheck("%s:%s:%d:%s:%d:%s" %
  #                    (boot_type, boot_device,
  #                     source_boot.size, source_boot.sha1,
  #                     target_boot.size, target_boot.sha1))
  #  so_far += source_boot.size
  #  script.SetProgress(so_far / total_verify_size)
    boot_img = common.GetBootableImage("boot.img", "boot.img",
                                     OPTIONS.input_tmp, "BOOT")
    common.CheckSize(boot_img.data, "boot.img", OPTIONS.info_dict)
    common.ZipWriteStr(output_zip, "boot.img", boot_img.data)

  if updating_recovery:
    recovery_img = common.GetBootableImage("recovery.img", "recovery.img",
                                     OPTIONS.input_tmp, "RECOVERY")
    common.CheckSize(recovery_img.data, "recovery.img", OPTIONS.info_dict)
    common.ZipWriteStr(output_zip, "recovery.img", recovery_img.data)

同理，如果要把boot.img全部烧录而不产生差分包。修改

#if updating_boot:
  #  total_patch_size += target_boot.size
    #script.ApplyPatch("%s:%s:%d:%s:%d:%s"
    #                  % (boot_type, boot_device,
    #                     source_boot.size, source_boot.sha1,
    #                     target_boot.size, target_boot.sha1),
    #                  "-",
    #                  target_boot.size, target_boot.sha1,
    #                  source_boot.sha1, "patch/boot.img.p")
    #so_far += target_boot.size

    script.WriteRawImage("/boot", "boot.img")
    #script.SetProgress(so_far / total_patch_size)
    # MakeRecoveryPatch(OPTIONS.target_tmp, output_zip,
    #                  target_recovery, target_boot)
    # script.DeleteFiles(["/system/recovery-from-boot.p",
    #                    "/system/etc/install-recovery.sh"])
    # print "recovery image changed; including as patch from boot."
    script.Print("Patching recovery image...")
    script.WriteRawImage("/recovery", "recovery.img")