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===============
apt-preferences
===============
This element generates the APT preferences file based on the provided manifest
provided by the :doc:`../manifests/README` element.
The APT preferences file can be used to control which versions of packages will
be selected for installation. APT uses a priority system to make this
determination. For more information about APT preferences, see the apt_preferences(5)
man page.
Environment Variables
---------------------
DIB_DPKG_MANIFEST:
:Required: No
:Default: None
:Description: The manifest file to generate the APT preferences file from.
:Example: ``DIB\_DPKG\_MANIFEST=~/image.d/dib-manifests/dib-manifest-dpkg-image``
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