diskimage-builder/diskimage_builder/elements/gentoo/README.rst
Ian Wienand 97c01e48ed Move elements & lib relative to diskimage_builder package
Currently we have all our elements and library files in a top-level
directory and install them into
<root>/share/diskimage-builder/[elements|lib] (where root is either /
or the root of a virtualenv).

The problem with this is that editable/development installs (pip -e)
do *not* install data_files.  Thus we have no canonical location to
look for elements -- leading to the various odd things we do such as a
whole bunch of guessing at the top of disk-image-create and having a
special test-loader in tests/test_elements.py so we can run python
unit tests on those elements that have it.

data_files is really the wrong thing to use for what are essentially
assets of the program.  data_files install works well for things like
config-files, init.d files or dropping documentation files.

By moving the elements under the diskimage_builder package, we always
know where they are relative to where we import from.  In fact,
pkg_resources has an api for this which we wrap in the new
diskimage_builder/paths.py helper [1].

We use this helper to find the correct path in the couple of places we
need to find the base-elements dir, and for the paths to import the
library shell functions.

Elements such as svc-map and pkg-map include python unit-tests, which
we do not need tests/test_elements.py to special-case load any more.
They just get found automatically by the normal subunit loader.

I have a follow-on change (I69ca3d26fede0506a6353c077c69f735c8d84d28)
to move disk-image-create to a regular python entry-point.

Unfortunately, this has to move to work with setuptools.  You'd think
a symlink under diskimage_builder/[elements|lib] would work, but it
doesn't.

[1] this API handles stuff like getting files out of .zip archive
modules, which we don't do.  Essentially for us it's returning
__file__.

Change-Id: I5e3e3c97f385b1a4ff2031a161a55b231895df5b
2016-11-01 17:27:41 -07:00

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========
Gentoo
========
Use a Gentoo cloud image as the baseline for built disk images. The images are
located in profile specific sub directories:
http://distfiles.gentoo.org/releases/amd64/autobuilds/
As of this writing, only x86_64 images are available.
Notes:
* There are very frequently new automated builds that include changes that
happen during the product maintenance. The download directories contain an
unversioned name and a versioned name. The unversioned name will always
point to the latest image, but will frequently change its content. The
versioned one will never change content, but will frequently be deleted and
replaced by a newer build with a higher version-release number.
* In order to run the package-installs element you will need to make sure
`dev-python/pyyaml` is installed on the host.
* In order to run the vm element you will need to make sure `sys-block/parted`
is installed on the host.
* Other profiles can be used by exporting GENTOO_PROFILE with a valid profile.
A list of valid profiles follows:
default/linux/amd64/13.0
default/linux/amd64/13.0/no-multilib
hardened/linux/amd64
hardened/linux/amd64/no-multilib
* You can set the GENTOO_PORTAGE_CLEANUP environment variable to true (or
anything other than False) to clean up portage from the system and get the
image size smaller.