diskimage-builder/elements/source-repositories/README.md
Derek Higgins 195053108b Adding docs for the source-repositories element
Change-Id: I57244a5cc2f563b2e69eb49388c3c6b49202c9eb
2013-07-10 13:04:39 +01:00

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With this element other elements can register source code repositories by
placing their details in the file source-repository-\*. An example
of an element "custom-element" that wants to retrieve the ironic source
from git and pbr from a tarball would be
*File : elements/custom-element/source-repository-ironic*
#<name> <type> <destination> <location> [<ref>]
# <ref> defaults to master if not specified
ironic git /usr/local/ironic git://github.com/openstack/ironic.git
*File : elements/custom-element/source-repository-pbr*
pbr tar /usr/local/pbr http://tarballs.openstack.org/pbr/pbr-master.tar.gz
diskimage-builder will then retrieve the sources specified and place them
at the directory \<destination\>
A number of environment variables can be set by the process calling
diskimage-builder which can change the details registered by the element, these are
DIB_REPOTYPE_<name> : change the registered type
DIB_REPOLOCATION_<name> : change the registered location
DIB_REPOREF_<name> : change the registered reference
for example if you would like diskimage-builder to get ironic from a local
mirror you could set DIB_REPOLOCATION_ironic=git://localgitserver/ironic.git
Alternatively if you would like to use the keystone element and build an image with
keystone from a stable branch then you would set DIB_REPOREF_keystone=stable/grizzly
Git sources will be cloned to \<destination\>
Tarballs will be extracted to \<destination\>. Tarballs should contain a
single topleval directory, regardless of the name of this top level directory
it will be renamed to \<destination\>
If mulitple elements register a source location with the same <destination>
then source-repositories will exit with an error. Care should therefore be taken
to only use elements together that download source to different locations.