========
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/amd64/17.0
default/linux/amd64/17.0/no-multilib
default/linux/amd64/17.0/hardened
default/linux/amd64/17.0/no-multilib/hardened
default/linux/amd64/17.0/systemd
* You can set the `GENTOO_PORTAGE_CLEANUP` environment variable to False to
disable the clean up of portage repositories (including overlays). This
will make the image bigger if caching is also disabled.
* Gentoo supports many different versions of python, in order to select one
you may use the `GENTOO_PYTHON_TARGETS` environment variable to select
the versions of python you want on your image. The format of this variable
is a string as follows `"python2_7 python3_6"`.
* In addition you can select the primary python version you wish to use (that
which will be called by running the `python` command. The
`GENTOO_PYTHON_ACTIVE_VERSION` is used to set that mapping. The variable
contents can be something like `python3.6`.
* You can enable overlays using the `GENTOO_OVERLAYS` variable. In it you
should put a space separated list of overlays. The overlays must be in the
official overlay list and must be git based.
* `GENTOO_EMERGE_ENV` is a bash array containing default environment
variables for package install, you can override it with another bash array.
* `GENTOO_EMERGE_DEFAULT_OPTS` can be set to control the default options
passed to emerge for all package actions, this includes operations like
depclean and preserved-rebuild.
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