Noam Angel 8b83196024 Add option to skip update packages

in same cases it is required to avoid update all existing packages,
doing so can result in release update which is currently not possible
unless you not include "base" element.

"base" element used for most distribution (rhel, debain), and is
necessary for most cloud operations, this patch add 
"DIB_AVOID_PACKAGES_UPDATE" parameter to skip updating all packages.

usecases for this patch can be:
 * Avoid release update when building old release ex. RHEL7.5.
 * build on network-less environment.

usage:
DIB_AVOID_PACKAGES_UPDATE=1

or
DIB_AVOID_PACKAGES_UPDATE=0

Change-Id: I71192b23c8f0bc48b348fe7377bf8a2399b53792

2019-02-25 06:31:30 +00:00

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base

This is the base element.

Almost all users will want to include this in their disk image build, as it includes a lot of useful functionality.

The DIB_CLOUD_INIT_ETC_HOSTS environment variable can be used to customize cloud-init's management of `/etc/hosts`:

If the variable is set to something, write that value as cloud-init's manage_etc_hosts.

If the variable is set to an empty string, don't create manage_etc_hosts setting (cloud-init will use its default value).

If the variable is not set, use "localhost" for now. Later, not setting the variable will mean using cloud-init's default. (To preserve diskimage-builder's current default behavior in the future, set the variable to "localhost" explicitly.)

The 'DIB_AVOID_PACKAGES_UPDATE' environment variable can be used to avoid updating all packages, useful when wanting to avoid release update.

'DIB_AVOID_PACKAGES_UPDATE' default is '0', all packages will be updated.

set 'DIB_AVOID_PACKAGES_UPDATE' to '1' to avoid updating all packages.

Notes:

If you are getting warnings during the build about your locale being missing, consider installing/generating the relevant locale. This may be as simple as having language-pack-XX installed in the pre-install stage

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base

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