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=============
install-types
=============
Enable install-types support for elements.
Install types permit elements to be installed from different sources, such as
git repositories, distribution packages, or pip. The default install type
is 'source' but it can be modified on the disk-image-create command line
via the --install-type option. For example you can set:
--install-type=package
to enable package installs by default. Alternately, you can also
set DIB\_DEFAULT\_INSTALLTYPE.
Many elements expose different install types. The different implementations
live under `<install-dir-prefix>-<install-type>-install` directories under an
element's install.d. The base element enables the chosen install type by
symlinking the correct hook scripts under install.d directly.
`<install-dir-prefix>` can be a string of alphanumeric and '-' characters, but
typically corresponds to the element name.
For example, the nova element would provide:
nova/install.d/nova-package-install/74-nova
nova/install.d/nova-source-install/74-nova
The following symlink would be created for the package install type:
install.d/74-nova -> nova-package-install/74-nova
Or, for the source install type:
install.d/74-nova -> nova-source-install/74-nova
All other scripts that exist under install.d for an element will be executed as
normal. This allows common install code to live in a script under install.d.
Environment Variables
---------------------
DIB_INSTALLTYPE_<install_dir_prefix>
:Required: No
:Default: source
:Description: Set the install type for the dir prefix. '-' characters can be
replaced with a '_'.
:Example: ``DIB_INSTALLTYPE_simple_init=repo`` Sets the simple-init element
install type to be repo.
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