46 lines
1.7 KiB
ReStructuredText
46 lines
1.7 KiB
ReStructuredText
Caches and offline mode
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=======================
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Since retrieving and transforming operating system image files, git
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repositories, Python or Ruby packages, and so on can be a significant overhead,
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we cache many of the inputs to the build process.
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The cache location is read from ``DIB_IMAGE_CACHE``. :ref:`developing-elements`
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describes the interface within disk-image-builder for caching.
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When invoking disk-image-builder, the ``--offline`` option will instruct
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disk-image-builder to not refresh cached resources. Alternatively you can set
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``DIB_OFFLINE=1``.
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Note that we don't maintain operating system package caches, instead depending
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on your local infrastructure (e.g. Squid cache, or an APT or Yum proxy) to
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facilitate caching of that layer, so you need to arrange independently for
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offline mode. For more information about setting up a squid proxy, consult the
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`TripleO documentation
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<http://docs.openstack.org/developer/tripleo-incubator/devtest_setup.html#f3>`_.
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Base images
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-----------
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These are cached by the standard elements - :doc:`../elements/fedora/README`,
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:doc:`../elements/redhat-common/README`, :doc:`../elements/ubuntu/README`,
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:doc:`../elements/debian/README` and :doc:`../elements/opensuse/README`.
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source-repositories
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-------------------
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Git repositories and tarballs obtained via the
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:doc:`../elements/source-repositories/README` element will be cached.
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C and C++ compilation
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---------------------
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Ccache is configured by the :doc:`../elements/base/README` element. Any
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compilation that honours ccache will be cached.
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PyPI
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----
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The :doc:`../elements/pypi/README` element will bind mount a PyPI mirror from
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the cache dir and configure pip and easy-install to use it.
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