make_ext4fs doesn't write out a CRC chunk, and append2simg doesn't
either, but append2simg was still performing a CRC on every input
block. Cuts append2simg time in half.
Change-Id: I678f807abbb741042461ed68a0f61b406d3665fb
append2simg causes libsparse to write mmapped data from a file
back to that same file. On btrfs, this sometimes causes a page
of zeroes to be written instead of the file data. Work around
the issue by writing the output to a temporary file and then
renaming it over the original file.
Change-Id: Ia194b6ba0ddb8548747b63292b523756f544706a
Append2simg is a small utility designed to glue data to the end
of a sparse image. Beware that it doesn't do anything clever with
that data.
Change-Id: I33af330cb4f77e0842375797a35aebbb6af60163
