The old method left settings in the environment. The new method takes
care of clearing them after use. In this module, the old method was
also setting the environment too late to affect all the command line
tools which lead to a bug.
Fixes https://github.com/ansible/ansible/issues/14264
Without this change, some trouble may occur when "deb" parameter
is used as env vars controlling dpkg are not set. For example,
installing a package that requires user input will never end since
DEBIAN_FRONTEND=noninteractive is not set.
So export env vars in APT_ENV_VARS before run dpkg, like in cases
using apt-get/aptitude.
Closes#1189.
This will cause the settings in Ansible to override the system settings.
That will have no effect except on systems that have an out-of-Ansible
configuration that disables automatic installation of recommended
packages. Previously, ansible would use the OS default whenever
install_recommends wasn't part of the playbook. This change will cause
the Ansible default configuration setting of installing recommended
packages to override the configuration files set on the OS for things
installed through ansible, even when there is no install_recommends
specified in the playbook. Because the OS default matches the Ansible
default, this shouldn't have wide impact.
In cases when the python-apt package is not installed, ansible will
attempt to install it. After this attempt, it tries to import the
needed apt modules, but forgets to import the apt.debfile module.
The result is that playbooks that use the dpkg argument on a machine
that does not initially have the python-apt package available will
fail with the following error
AttributeError: 'module' object has no attribute 'debfile'
This patch adds the appropriate import to the apt module to ensure
that necessary libraries are available in cases when the dpkg argument
is being used on a system that does not initially have the python-apt
package installed
