dotcloud/docker — pull request #308 by unclejack (2013-04-01 23:25:47+00:00)
Title: #194 - add and use xz as default image compression

This pull request adds support for xz compression and makes it the default for uploads to the registry.

Please note that bsdtar can handle xz compression and decompression without external programs.

xz can lower the size of the images down to 20-30% of the original size.