Gregory Haynes 360033027f Create a user guide

Our docs are very developer focused. Lets create a separate user guide
to help new users get started.

Change-Id: I8a03920e6d3306dd0405177875ea55ccb4b40fea

2015-04-01 19:51:08 +00:00

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Caches and offline mode

Since retrieving and transforming operating system image files, git repositories, Python or Ruby packages, and so on can be a significant overhead, we cache many of the inputs to the build process in ~/.cache/image-create/. The writing an element documention describes the interface within disk-image-builder for caching. When invoking disk-image-builder the --offline option will instruct disk-image-builder to not refresh cached resources.

Note that we don't maintain operating system package caches, instead depending on your local infrastructure (e.g. Squid cache, or an APT or Yum proxy) to facilitate caching of that layer, so you need to arrange independently for offline mode.

Base images

These are cached by the standard elements - fedora, redhat, ubuntu, debian and opensuse.

source-repositories

Git repositories and tarballs obtained via the source-repositories element will be cached.

C and C++ compilation

Ccache is configured by the base element. Any compilation that honours ccache will be cached.

PyPI

The pypi element will bind mount a PyPI mirror from the cache dir and configure pip and easy-install to use it.

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