Generate a tarball of differences between two tarballs.
It is possible to optimize docker containers such that multiple containers are based off of a single copy of a common base image. If containers are constructed from tarballs, then it can be useful to create a delta tarball which contains the differences between a base image and a derived image. The delta tarball can then be layered on top of the base image using a Dockerfile like the following:
FROM base ADD delta.tar.xz /
Many different types of containers can thus be derived from a common base image, while sharing a single copy of the base image. This saves disk space, and can also reduce memory consumption since it avoids having duplicate copies of base image data in the kernel's buffer cache.
usage: tardelta [-h] [--compressor COMMAND] [--encoding ENCODING] [--format FORMAT] [-v] BASE DERIV DELTA tardelta Generate a tarball of differences between two tarballs positional arguments: BASE base input tar file DERIV derived input tar file DELTA delta output tar file optional arguments: -h, --help show this help message and exit --compressor COMMAND use the specified command for compression via stdio --encoding ENCODING tar file encoding (default is UTF-8) --format FORMAT tar format: gnu, pax, or ustar (default is pax) -v, --verbose verbose logging (each occurence increases verbosity)