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Grub Dpkg
---------
**Summary:** configure grub debconf installation device

Configure which device is used as the target for grub installation. This module
should work correctly by default without any user configuration. It can be
enabled/disabled using the ``enabled`` config key in the ``grub_dpkg`` config
dict. The global config key ``grub-dpkg`` is an alias for ``grub_dpkg``. If no
installation device is specified this module will execute grub-probe to
determine which disk the /boot directory is associated with.

The value which is placed into the debconf database is in the format which the
grub postinstall script expects. Normally, this is a /dev/disk/by-id/ value,
but we do fallback to the plain disk name if a by-id name is not present.

If this module is executed inside a container, then the debconf database is
seeded with empty values, and install_devices_empty is set to true.

**Internal name:** ``cc_grub_dpkg``

**Module frequency:** per instance

**Supported distros:** ubuntu, debian

**Config keys**::

    grub_dpkg:
        enabled: <true/false>
        grub-pc/install_devices: <devices>
        grub-pc/install_devices_empty: <devices>
    grub-dpkg: (alias for grub_dpkg)
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