0.5.3: Copy and Entrypoint/Cmd semantics

Box Version 0.5.3

Box is a small utility for the building of docker images. Through use of mruby,
we provide additional flexibility over the vanilla docker build command by
adding control structures and basic predicates. We also add new verbs that
allow new actions, such as flattening and tagging images.

Some features that differentiate it from docker build:

• Unique general features:
  • mruby syntax
  • Filtering of keywords to secure builds
  • Shell mode
• In the build plan itself:
  • Layer editing and composition
  • Tagging
  • Flattening
  • Debug mode (drop to a shell in the middle of a plan run and inspect your container)
  • Ruby block methods for user (with_user) and workdir (inside) allow
    you to scope copy and run operations for a more obvious build plan.

This is the 0.5.3 release of Box, the mruby-inspired advanced docker
builder. If you're new to Box, you can read the documentation here.

The changes included in this version of Box are:

copy statements have changed:

• Copy-over-dir is now on, will appropriately copy into dirs (or create
  them) or over them depending on the presence of a final / in the
  target path.
• Copies of relative symlinks now work correctly.
• Copies of files with no trailing / are added to the image
  verbatim.

and finally, a long note about entrypoint and cmd:

previously, nulls would be set on the entrypoint, triggering inheritance
from run statments that were the previous commit in the docker chain.
What this does now is set it to []string which is an empty command in
the docker configuration.

Note that there is now no way to do entrypoint nil in a way that will
inherit from the previous entrypoint statement, however, I don't think
this is necessarily a bad thing. :)

Sums:

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