iiab/roles/network/tasks/computed_network.yml

# just lie about active gateway present on XOs to suppress ifcfg-WAN
# auto-creation/moving with XOs using NM/system-connections/ via keyfile.
# ifcfg-rh acts on /etc/sys*/net*/ifcfg-* where we search for devices.
- name: Setting XO has WiFi gateway
  set_fact:
    user_wan_iface: "{{ discovered_wan_iface }}"
  when: not (discovered_wan_iface == "none") and not (xo_model == "none") and has_ifcfg_gw == "none"

#- name: Checking for NetworkManager-config-server
#  shell: rpm -qa | grep  NetworkManager-config-server | wc -l
#  register: strict_networking_check

#- name: Found Checking for NetworkManager-config-server
#  set_fact:
#     strict_networking: True
#  when: strict_networking_check == "1"

#- name: Use restricted network features
#  set_fact:
#     iiab_demo_mode: True
#  when: teamviewer_install and not strict_networking

- name: XO laptop wants USB WiFi interface as AP mode
  set_fact:
    iiab_wireless_lan_iface: "{{ discovered_lan_iface }}"
  when: num_wifi_interfaces >= "2" and not (xo_model == "none") and not (discovered_wan_iface == "none") and discovered_wireless_iface == "eth0"

# static backout suppy new template file
- name: gui-static-wan
  set_fact:
    wan_ip: dhcp
    gui_static_wan_ip: undefined
  when: not (gui_static_wan_ip == "unset") and not gui_static_wan

- name: Undo gui-static-wan by requesting new template file
  set_fact:
    has_WAN: False
  when: not (gui_static_wan_ip == "unset") and not gui_static_wan

# figure out more than one interfaces to detect.
- name: Using GUI_STATIC info
  set_fact:
    has_WAN: False
    has_ifcfg_gw: "none"
    wan_ip: "{{ gui_static_wan_ip }}"
    wan_netmask: "{{ gui_static_wan_netmask }}"
    wan_gateway: "{{ gui_static_wan_gateway }}"
    wan_nameserver: "{{ gui_static_wan_nameserver }}"
  when: gui_static_wan or not (user_wan_iface == "auto")

# we need to have an interface name for ifcfg-WAN to be able to change gateway
# the DEVICE from the gui. Thanks to George for proving my point about knowing
# what device to switch to.
#- name: Using GUI_WAN info
#  set_fact:
#    user_wan_iface: "{{ gui_wan_iface }}"
#  when: gui_wan_iface != "unset" and gui_desired_network_role is defined and gui_desired_network_role != "LanController"

# should make the GUI buttons the last call
- name: Checking iiab_wan_enabled
  set_fact:
    user_wan_iface: "none"
  when: not iiab_wan_enabled

# gui wants LanController # keeps ifcfg-WAN but onboot=no
# the change over might be a little bumpy ATM.
- name: Setting GUI wants 'LanController'
  set_fact:
    device_gw: "none"
    user_wan_iface: "none"
    iiab_gateway_enabled: "False"
  when: gui_desired_network_role is defined and gui_desired_network_role == "LanController"

# device_gw is used with the LAN detection and LAN's ifcfg file deletion.
# single interface vars/ users would need to set iiab_wan_enabled False as above, to disable the WAN
# and set user_lan_iface = <device> to suppress the auto detection for the same effect.

- name: Setting user_lan_iface for 'LanController' for single interface
  set_fact:
    user_lan_iface: "{{ discovered_wan_iface }}"
  when: not (discovered_wan_iface == "none") and num_lan_interfaces == "0" and gui_desired_network_role is defined and gui_desired_network_role == "LanController"

# override with user_wan_iface setting if no longer in auto
- name: Setting user WAN fact
  set_fact:
    iiab_wan_iface: "{{ user_wan_iface }}"
  when: not (user_wan_iface == "auto")

# user disabled interface - overriding all other entries
- name: Checking iiab_lan_enabled
  set_fact:
    user_lan_iface: "none"
  when: not iiab_lan_enabled

# gui wants Appliance Note: could of used iiab_lan_enabled false
- name: Setting GUI wants 'Appliance'
  set_fact:
    user_lan_iface: "none"
    iiab_gateway_enabled: "False"
  when: gui_desired_network_role is defined and gui_desired_network_role == "Appliance"

# gui wants Gateway
- name: Setting GUI wants and has active 'Gateway'
  set_fact:
    user_lan_iface: "auto"
    user_wan_iface: "{{ iiab_wan_iface }}"
  when: gui_desired_network_role is defined and gui_desired_network_role == "Gateway" and not (iiab_wan_iface == "none")

# make it so number 2 vars should use user_wan_iface but we can cover a single
# wired if dhcp fails the interface should revert to LAN, static address should
# stick around but testing gateway response is not performed.
- name: User wants single wired interface as static or dhcp gateway
  set_fact:
    user_wan_iface: "{{ discovered_wan_iface }}"   # Jan 2018: Holt discovered_lan_iface was UNDEFINED on WiFi-installed
                                                   # RPi (when re-running ./iiab-network) so "discovered_wan_iface" is a
                                                   # workaround -- please see https://github.com/iiab/iiab/pull/649
                                                   # This workaround can and should evolve as IIAB 6.5 matures!
  when: num_lan_interfaces == "1" and user_lan_iface == "auto" and user_wan_iface == "auto"

- name: Use old gateway device info if not detected and using static ip
  set_fact:
    iiab_wan_iface: "{{ device_gw }}"
  when: not (wan_ip == "dhcp") and iiab_wan_iface == "none"

- name: No LAN configured - 'Appliance' mode
  set_fact:
    iiab_network_mode: "Appliance"
  when: iiab_lan_iface == "none"

- name: LAN configured - 'LanController' mode
  set_fact:
    iiab_network_mode: "LanController"
  when: not (iiab_lan_iface == "none") and iiab_wan_iface == "none"

- name: LAN configured - 'Gateway' mode
  set_fact:
    iiab_network_mode: "Gateway"
  when: (not (iiab_lan_iface == "none") and not (iiab_wan_iface == "none"))

# override with user_lan_iface setting if no longer in auto
- name: Setting user LAN fact
  set_fact:
    iiab_lan_iface: "{{ user_lan_iface }}"
  when: not (user_lan_iface == "auto")

# so this works
- name: Interface count
  shell: ls /sys/class/net | grep -v -e lo -e bridge0 -e veth -e "br-*" -e docker| wc | awk '{print $1}'
  register: adapter_count

# well if there ever was a point to tell the user things are FUBAR this is it.
- name: We're hosed no work interfaces
  set_fact:
    iiab_network_mode: "No_network_found"
  when: adapter_count.stdout|int == "0"

# well if there ever was a point to tell the user things are FUBAR this is it.
- name: I'm not guessing declare gateway please
  set_fact:
    iiab_network_mode: "Undetectable_use_local_vars"
    iiab_wan_iface: "none"
  when: adapter_count.stdout|int >= "5" and device_gw == "none" and gui_wan_iface == "unset" and gui_static_wan is defined

- name: Record IIAB_WAN_DEVICE to {{ iiab_env_file }}
  lineinfile:
    path: "{{ iiab_env_file }}"
    regexp: '^IIAB_WAN_DEVICE=*'
    line: 'IIAB_WAN_DEVICE={{ iiab_wan_iface }}'
  when: not installing   #REMOVE THIS LINE IF installing IS ALWAYS false AS SET IN roles/0-init/defaults/main.yml

- name: Record IIAB_LAN_DEVICE to {{ iiab_env_file }}
  lineinfile:
    path: "{{ iiab_env_file }}"
    regexp: '^IIAB_LAN_DEVICE=*'
    line: 'IIAB_LAN_DEVICE={{ iiab_lan_iface }}'
    state: present
  when: not installing   #REMOVE THIS LINE IF installing IS ALWAYS false AS SET IN roles/0-init/defaults/main.yml

- name: Add 'computed_network' variable values to {{ iiab_ini_file }}
  ini_file:
    dest: "{{ iiab_ini_file }}"
    section: computed_network
    option: "{{ item.option }}"
    value: "{{ item.value | string }}"
  with_items:
  - option: iiab_wan_enabled
    value: "{{ iiab_wan_enabled }}"
  - option: user_wan_iface
    value: "{{ user_wan_iface }}"
  - option: iiab_wan_iface
    value: "{{ iiab_wan_iface }}"
  - option: iiab_lan_enabled
    value: "{{ iiab_lan_enabled }}"
  - option: user_lan_iface
    value: "{{ user_lan_iface }}"
  - option: iiab_lan_iface
    value: "{{ iiab_lan_iface }}"
  - option: iiab_network_mode
    value: "{{ iiab_network_mode }}"
  - option: hostapd_enabled
    value: "{{ hostapd_enabled }}"
  - option: host_ssid
    value: "{{ host_ssid }}"
  - option: host_wifi_mode
    value: "{{ host_wifi_mode }}"
  - option: host_channel
    value: "{{ host_channel }}"