Merge "releasetools: Perform erase commands first." into nyc-dev

      total += self.tgt.extended.size()

    # We erase all the blocks on the partition that a) don't contain useful

    # data in the new image and b) will not be touched by dm-verity.

    # data in the new image; b) will not be touched by dm-verity. Out of those

    # blocks, we erase the ones that won't be used in this update at the

    # beginning of an update. The rest would be erased at the end. This is to

    # work around the eMMC issue observed on some devices, which may otherwise

    # get starving for clean blocks and thus fail the update. (b/28347095)

    all_tgt = RangeSet(data=(0, self.tgt.total_blocks))

    all_tgt_minus_extended = all_tgt.subtract(self.tgt.extended)

    new_dontcare = all_tgt_minus_extended.subtract(self.tgt.care_map)

    if new_dontcare:

      out.append("erase %s\n" % (new_dontcare.to_string_raw(),))

    erase_first = new_dontcare.subtract(self.touched_src_ranges)

    if erase_first:

      out.insert(0, "erase %s\n" % (erase_first.to_string_raw(),))

    erase_last = new_dontcare.subtract(erase_first)

    if erase_last:

      out.append("erase %s\n" % (erase_last.to_string_raw(),))

    out.insert(0, "%d\n" % (self.version,))   # format version number

    out.insert(1, "%d\n" % (total,))