This README.slackware describes one method of converting a minimal
incus image into a fully loaded slackware image suitable, for
instance, of providing a clean environment for package building.

Throughout this description, the minimal images decribed in
README.docker will be used as the subject images to update to the
full Slackware software installation i.e image example-1 (x86_64)
and example-2 (i686).

The general strategy is to run an update script from within a running
image instance. The incus-update_image.sh script is used to prepare
the image and set various options before installing and running a
second script, named incus-install_all.sh, from within the image.

The incus-update_image.sh script takes at least one parameter, the
image name. A second parameter is optional, to provide an alternative
URL to a mirror from which to download Slackware packages. If no
alternative mirror is provided, the location already set in the
minimal image's /etc/slackpkg/mirrors file is used.

Invocation is therefore:
    bash incus-update_image.sh <image_name> [mirror]

e.g.
    bash incus-update_image.sh example-1
e.g.
    bash incus-update_image.sh example-1 http://192.168.1.16/slackware/slackware64-15.0/

The image will be configured with the same timezone as the host
system. If an alternative timezone is desired, replace the existing
setting of NEW_LOCAL_TIME near the beginning of the script e.g.
    NEW_LOCAL_TIME=/usr/share/zoneinfo/Atlantic/Reykjavik
Alternatively set the desired setting of NEW_LOCAL_TIME in the
environment before running the script:
e.g.
    NEW_LOCAL_TIME=/usr/share/zoneinfo/Atlantic/Reykjavik bash incus-update_image.sh example-1
e.g.
    export NEW_LOCAL_TIME=/usr/share/zoneinfo/Atlantic/Reykjavik
    bash incus-update_image.sh example-1

Some very basic checking of the mirror site URL is performed. It
assumes the URL string will contain 'ware64' (as in slackware64-15.0
for instance) for x86_64 images; it will not contain 'ware64' for
i686 images. If it looks OK, a downloaded version of the mirrors file
is amended and pushed back to the image.

The installation script itself (incus-install_all.sh) is then pushed
to the image and executed.

A full update of the image may take some time, depending on speed
of the download site and connectivity to it.