paludis: setup cross as separate environment

defaults - main.yml

---
paludis_confdir: /etc/paludis
paludis_repos: /var/db/paludis/repositories

tasks - cross_env.yml

# TODO probably should also create dirs under /var/db/paludis/repositories/cross-installed/
---
- name: Plan things for {{cross_env_name}}
  set_fact:
    paludis_confdir_cross: "{{paludis_confdir}}-{{cross_env_name}}"
    tool_prefix: "{{cross_compile_host}}-"

- name: Remove cross repo from main configuration
  file:
    path: "{{paludis_confdir}}/repositories/{{cross_compile_host}}.conf"
    state: absent
  notify:
    - etckeeper

- name: Environment configuration directory
  file:
    path: "{{paludis_confdir_cross}}/repositories"
    state: directory

- name: Installed repository for {{cross_env_name}}
  template:
    src: repo_config/installed-cross.conf
    dest: "{{paludis_confdir_cross}}/repositories/installed-{{cross_env_name}}.conf"
  notify: etckeeper

- name: Find existing configuration files
  find:
    paths: "{{paludis_confdir}}"
    patterns:
      - "bashrc"
      - "hooks"
      - "*.conf*"
    recurse: no
    file_type: any
  register: found_configs

- name: Symlink configuration to {{cross_env_name}}
  file:
    src: "{{item.path}}"
    dest: "{{paludis_confdir_cross}}/{{item.path | basename}}"
    state: link
    force: yes
  loop: "{{found_configs.files}}"
  loop_control:
    label: "{{item.path | basename}}"
  notify: etckeeper

- name: Find configured repositories
  find:
    paths: "{{paludis_confdir}}/repositories/"
    patterns:
      - "*.conf"
      - "*.bash"
    exclude:
      - pbins.conf # only native there
  register: found_repos

- name: Symlink repositories to {{cross_env_name}}
  file:
    src: "{{item.path}}"
    dest: "{{paludis_confdir_cross}}/repositories/{{item.path | basename}}"
    state: link
    force: yes
  loop: "{{found_repos.files}}"
  loop_control:
    label: "{{item.path | basename}}"
  notify: etckeeper

tasks - main.yml

---
- import_tasks: cross_env.yml
  vars:
    cross_env_name: i686
    cross_compile_host: i686-pc-linux-gnu

templates - repo_config - installed-cross.conf

format = exndbam
location = ${root}{{paludis_repos}}/cross-installed/{{cross_compile_host}}
name = {{cross_env_name}}
split_debug_location = /usr/{{cross_compile_host}}/lib/debug
tool_prefix = {{tool_prefix}}
cross_compile_host = {{cross_compile_host}}

Assuming configuration is shared between /etc/paludis and /etc/paludis-cross_env_name

Also targets for toolchain packages should contain cross_compile_host.