Merge "releasetools: Fix the bug in symlink deletion."

    cmd = "delete(" + ",\0".join(['"%s"' % (i,) for i in file_list]) + ");"

    self.script.append(self.WordWrap(cmd))

  def DeleteFilesIfNotMatching(self, file_list):

    """Delete the file in file_list if not matching the checksum."""

    if not file_list:

      return

    for name, sha1 in file_list:

      cmd = ('sha1_check(read_file("{name}"), "{sha1}") || '

             'delete("{name}");'.format(name=name, sha1=sha1))

      self.script.append(self.WordWrap(cmd))

  def RenameFile(self, srcfile, tgtfile):

    """Moves a file from one location to another."""

    if self.info.get("update_rename_support", False):

  # 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 = []

  # If a symlink in the source will be replaced by a regular file, we cannot

  # delete the symlink/file in case the package gets applied again. For such

  # a symlink, we prepend a sha1_check() to detect if it has been updated.

  # (Bug: 23646151)

  replaced_symlinks = dict()

  if system_diff:

    for i in system_diff.verbatim_targets:

      replaced_symlinks["/%s" % (i[0],)] = i[2]

  if vendor_diff:

    for i in vendor_diff.verbatim_targets:

      replaced_symlinks["/%s" % (i[0],)] = i[2]

  if system_diff:

    for tf in system_diff.renames.values():

      replaced_symlinks["/%s" % (tf.name,)] = tf.sha1

  if vendor_diff:

    for tf in vendor_diff.renames.values():

      replaced_symlinks["/%s" % (tf.name,)] = tf.sha1

  always_delete = []

  may_delete = []

  for dest, link in source_symlinks:

    if link not in target_symlinks_d:

      to_delete.append(link)

  script.DeleteFiles(to_delete)

      if link in replaced_symlinks:

        may_delete.append((link, replaced_symlinks[link]))

      else:

        always_delete.append(link)

  script.DeleteFiles(always_delete)

  script.DeleteFilesIfNotMatching(may_delete)

  if system_diff.verbatim_targets:

    script.Print("Unpacking new system files...")