site.rst

Site configuration
==================

The ``site`` consists of the files ``site.conf`` and ``site.mk``.
In the first community based values are defined, which both are processed
during the build process and runtime.
The last is directly included in the make process of Gluon.

Configuration
-------------

The ``site.conf`` is a lua dictionary with the following defined keys.

hostname_prefix
  A string which shall prefix the default hostname of a device.

site_name
  The name of your community.

site_code
  The code of your community. It is good practice to use the TLD of
  your community here.

domain_seed
  32 bytes of random data, encoded in hexadecimal, used to seed other random
  values specific to the mesh domain. It must be the same for all nodes of one
  mesh, but should be different for firmware that is not supposed to mesh with
  each other.

  The recommended way to generate a value for a new site is::

    echo $(hexdump -v -n 32 -e '1/1 "%02x"' </dev/urandom)

prefix4 \: optional
  The IPv4 Subnet of your community mesh network in CIDR notation, e.g. ::

    prefix4 = '10.111.111.0/18'

  Required if ``next_node.ip4`` is set.

prefix6
  The IPv6 subnet of your community mesh network, e.g. ::

    prefix6 = 'fdca::ffee:babe:1::/64'

node_prefix6
  The ipv6 prefix from which the unique IP-addresses for nodes are selected
  in olsr-based networks. This may overlap with prefix6. e.g. ::

    node_prefix6 = 'fdca::ffee:babe:2::/64'

node_client_prefix6 \: optional, deprecated
  DEPRECATED: Don't specify it anymore, this prefix will then
  automatically be generated from the domain_seed.

  An IPv6 prefix internally used by the l3roamd protocol, used to allow
  an efficient handover via unicast when a client roamed.
  This is exclusively useful when running a routing mesh protocol
  like olsr. e.g. ::

    node_client_prefix6 = 'fdca::ffee:babe:3::/64'

timezone
  The timezone of your community live in, e.g. ::

    -- Europe/Berlin
    timezone = 'CET-1CEST,M3.5.0,M10.5.0/3'

ntp_servers
  List of NTP servers available in your community or used by your community, e.g.::

    ntp_servers = {'1.ntp.services.ffac','2.ntp.services.ffac'}

  These NTP servers must be reachable via IPv6 from the nodes. If you don't want to set an IPv6 address
  explicitly, but use a hostname (which is recommended), see also the :ref:`FAQ <faq-dns>`.

opkg \: optional
  ``opkg`` package manager configuration.

  There are two optional fields in the ``opkg`` section:

  - ``openwrt`` overrides the default OpenWrt repository URL. The default URL would
    correspond to ``http://downloads.openwrt.org/snapshots/packages/%A``
    and usually doesn't need to be changed when nodes are expected to have IPv6
    internet connectivity.
  - ``extra`` specifies a table of additional repositories (with arbitrary keys)

  ::

    opkg = {
      openwrt = 'http://opkg.services.ffac/openwrt/snapshots/packages/%A',
      extra = {
        gluon = 'http://opkg.services.ffac/modules/gluon-%GS-%GR/%S',
      },
    }

  There are various patterns which can be used in the URLs:

  - ``%d`` is replaced by the OpenWrt distribution name ("openwrt")
  - ``%v`` is replaced by the OpenWrt version number (e.g. "17.01")
  - ``%S`` is replaced by the target board (e.g. "ath79/generic")
  - ``%A`` is replaced by the target architecture (e.g. "mips_24kc")
  - ``%GS`` is replaced by the Gluon site code (as specified in ``site.conf``)
  - ``%GV`` is replaced by the Gluon version
  - ``%GR`` is replaced by the Gluon release (as specified in ``site.mk``)

regdom \: optional
  The wireless regulatory domain responsible for your area, e.g. ::

    regdom = 'DE'

  Setting ``regdom`` is mandatory if ``wifi24`` or ``wifi5`` is defined.

wifi24 \: optional
  WLAN configuration for 2.4 GHz devices.
  ``channel`` must be set to a valid wireless channel for your radio.
  ``beacon_interval`` can be specified to set a custom beacon interval in
  time units (TU). A time unit is equivalent to 1024 µs.
  If not set, the default value of 100 TU (=102.4 ms) is used.

  There are currently two interface types available. You may choose to
  configure any subset of them:

  - ``ap`` creates a master interface where clients may connect
  - ``mesh`` creates an 802.11s mesh interface with forwarding disabled

  Each interface may be disabled by setting ``disabled`` to ``true``.
  This will only affect new installations.
  Upgrades will not change the disabled state.

  ``ap`` holds the client network configuration.
  To create an unencrypted client network, a string named ``ssid`` which sets the
  interface's ESSID is required. This is the wireless network clients connect to.
  For an OWE secured network, the ``owe_ssid`` string has to be set. It sets the
  SSID for the opportunistically encrypted wireless network, to which compatible
  clients can connect to.
  For OWE to work, the ``wireless-encryption-wpa3`` has to be enabled as a feature
  in your site.
  To utilize the OWE transition mode, ``owe_transition_mode`` has to be set to true.
  When ``owe_transition_mode`` is enabled, the OWE secured SSID will be hidden.
  Compatible devices will automatically connect to the OWE secured SSID when selecting
  the open SSID.
  Note that for the transition mode to work, both ``ssid`` as well as ``owe_ssid``
  have to be enabled. Also, some devices with a broken implementation might not be able
  to connect with a transition-mode enabled network.

  ``mesh`` requires a single parameter, a string, named ``id`` which sets the
  mesh id, also visible as an open WiFi in some network managers. Usually you
  don't want users to connect to this mesh-SSID, so use a cryptic id that no
  one will accidentally mistake for the client WiFi.

  ``mesh`` also accepts an optional ``mcast_rate`` (kbit/s) parameter for
  setting the multicast bitrate. Increasing the default value of 1000 to something
  like 12000 is recommended.

  ::

    wifi24 = {
      channel = 11,
      ap = {
        ssid = 'alpha-centauri.freifunk.net',
        owe_ssid = 'owe.alpha-centauri.freifunk.net',
        owe_transition_mode = true,
      },
      mesh = {
        id = 'ueH3uXjdp',
        mcast_rate = 12000,
      },
    },

.. _user-site-wifi5:

wifi5 \: optional
  Same as `wifi24` but for the 5 GHz radio.

  Additionally a range of channels that are safe to use outsides on the 5 GHz band can
  be set up through ``outdoor_chanlist``, which allows for a space-separated list of
  channels and channel ranges, separated by a hyphen.
  When set this offers the outdoor mode flag for 5 GHz radios in the config mode which
  reconfigures the AP to select its channel from outdoor chanlist, while respecting
  regulatory specifications, and disables mesh on that radio.
  The ``outdoors`` option in turn allows to configure when outdoor mode will be enabled.
  When set to ``true`` all 5 GHz radios will use outdoor channels, while on ``false``
  the outdoor mode will be completely disabled. The default setting is ``'preset'``,
  which will enable outdoor mode automatically on outdoor-capable devices.

  It can be beneficial to look up the WLAN channels that are used by `weather radars`_
  when constructing ``outdoor_chanlist`` to try and minimize the impact of DFS events.

  .. _weather radars: https://homepage.univie.ac.at/albert.rafetseder/RADARs/help.html

  ::

    wifi5 = {
      channel = 44,
      outdoor_chanlist = "100-140",

      [...]
    },

next_node \: package
  Configuration of the local node feature of Gluon

  ::

    next_node = {
      name = { 'nextnode.location.community.example.org', 'nextnode', 'nn' },
      ip4 = '10.23.42.1',
      ip6 = 'fdca:ffee:babe:1::1',
      mac = '16:41:95:40:f7:dc'
    }

  All values of this section are optional. If the IPv4 or IPv6 address is
  omitted, there will be no IPv4 or IPv6 anycast address. The MAC address
  defaults to ``16:41:95:40:f7:dc``; this value usually doesn't need to be
  changed, but it can be adjusted to match existing deployments that use a
  different value.

  When the nodes' next-node address is used as a DNS resolver by clients
  (by passing it via DHCP or router advertisements), it may be useful to
  allow resolving a next-node hostname without referring to an upstream DNS
  server (e.g. to allow reaching the node using such a hostname via HTTP or SSH
  in isolated mesh segments). This is possible by providing one or more names
  in the ``name`` field.

.. _user-site-mesh:

mesh
  Configuration of general mesh functionality.

  To avoid inter-mesh links, Gluon can encapsulate the mesh protocol in VXLAN
  for Mesh-on-LAN/WAN. It is recommended to set *mesh.vxlan* to ``true`` to
  enable VXLAN in new setups. Setting it to ``false`` disables this
  encapsulation to allow meshing with other nodes that don't support VXLAN
  (Gluon 2017.1.x and older). In multi-domain setups, *mesh.vxlan* is optional
  and defaults to ``true``.

  Gluon generally segments layer-2 meshes so that each node becomes IGMP/MLD
  querier for its own local clients. This is necessary for reliable multicast
  snooping. The segmentation is realized by preventing IGMP/MLD queries from
  passing through the mesh. See also
  :ref:`gluon-mesh-batman-adv <igmp-mld-domain-segmentation>` for details.

  By default, not only queries are filtered, but also membership report and
  leave packets, as they add to the background noise of the mesh. As a
  consequence, snooping switches outside the mesh that are connected to a
  Gluon node need to be configured to forward all multicast traffic towards
  the mesh; this is usually not a problem, as such setups are unusual. If
  you run a special-purpose mesh that requires membership reports to be
  working, this filtering can be disabled by setting the
  optional *filter_membership_reports* value to ``false``.

  In addition, options specific to the batman-adv routing protocol can be set
  in the *batman_adv* section:

  The mandatory value *routing_algo* selects the batman-adv protocol variant.
  The following values are supported:

  - ``BATMAN_IV``
  - ``BATMAN_V``

  The optional value *gw_sel_class* sets the gateway selection class, the
  default is ``20`` for B.A.T.M.A.N. IV and ``5000`` kbit/s for B.A.T.M.A.N. V.

  - **B.A.T.M.A.N. IV:** with the value ``20`` the gateway is selected based
    on the link quality (TQ) only; with class ``1`` it is calculated from
    both, the TQ and the announced bandwidth.
  - **B.A.T.M.A.N. V:** with the value ``1500`` the gateway is selected if the
    throughput is at least 1500 kbit/s faster than the throughput of the
    currently selected gateway.

  For details on determining the threshold, when to switch to a new gateway,
  see `batctl manpage`_, section "gw_mode".

  .. _batctl manpage: https://www.open-mesh.org/projects/batman-adv/wiki/Gateways

  ::

    mesh = {
      vxlan = true,
      filter_membership_reports = false,
      batman_adv = {
        routing_algo = 'BATMAN_IV',
        gw_sel_class = 1,
      },
    }


mesh_vpn
  Remote server setup for the mesh VPN.

  The `enabled` option can be set to true to enable the VPN by default. `mtu`
  defines the MTU of the VPN interface, determining a proper MTU value is described
  in :doc:`mtu`.

  By default the public key of a node's VPN daemon is not added to announced respondd
  data; this prevents malicious ISPs from correlating VPN sessions with specific mesh
  nodes via public respondd data. If this is of no concern in your threat model,
  this behaviour can be disabled (and thus announcing the public key be enabled) by
  setting `pubkey_privacy` to `false`.

  The `fastd` section configures settings specific to the *fastd* VPN
  implementation.

  If `configurable` is set to `false` or unset, the method list will be replaced on updates
  with the list from the site configuration. Setting `configurable` to `true` will allow the user to
  add the method ``null`` to the beginning of the method list or remove ``null`` from it,
  and make this change survive updates. Setting `configurable` is necessary for the
  package `gluon-web-mesh-vpn-fastd`, which adds a UI for this configuration.

  In any case, the ``null`` method should always be the first method in the list
  if it is supported at all. You should only set `configurable` to `true` if the
  configured peers support both the ``null`` method and methods with encryption.

  You can set syslog_level from verbose (default) to warn to reduce syslog output.

  fastd allows to configure a tree of peer groups and peers. By default, the
  list of groups and peers configured in the *fastd* UCI config is completely
  replaced by the list from site.conf on upgrades. To allow custom modifications
  to the peer list, removal and modification of peers can be prevented by
  setting the *preserve* option of a peer to ``1`` in UCI.

  **Note:** It may be interesting to include the package *gluon-iptables-clamp-mss-to-pmtu*
  in the build when using *gluon-mesh-olsrd* to work around ICMP black holes on the internet.

  ::

    mesh_vpn = {
      -- enabled = true,
      -- pubkey_privacy = true,

      fastd = {
        mtu = 1312,
        methods = {'salsa2012+umac'},
        -- configurable = true,
        -- syslog_level = 'warn',
        groups = {
          backbone = {
            -- Limit number of connected peers from this group
            limit = 1,
            peers = {
              peer1 = {
                key = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
                -- Having multiple domains prevents SPOF in freifunk.net
                remotes = {
                  'ipv4 "vpn1.alpha-centauri.freifunk.net" port 10000',
                  'ipv4 "vpn1.alpha-centauri-freifunk.de" port 10000',
                },
              },
              peer2 = {
                key = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
                -- You can also omit the ipv4 to allow both connection via ipv4 and ipv6
                remotes = {'"vpn2.alpha-centauri.freifunk.net" port 10000'},
              },
              peer3 = {
                key = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
                -- In addition to domains you can also add ip addresses, which provides
                -- resilience in case of dns outages
                remotes = {
                  '"vpn3.alpha-centauri.freifunk.net" port 10000',
                  '[2001:db8::3:1]:10000',
                  '192.0.2.3:10000',
                },
              },
            },
            -- Optional: nested peer groups
            -- groups = {
            --   lowend_backbone = {
            --     limit = 1,
            --     peers = ...
            --   },
            -- },
          },
          -- Optional: additional peer groups, possibly with other limits
          -- peertopeer = {
          --   limit = 10,
          --   peers = { ... },
          -- },
        },
      },

      wireguard = {
        mtu = 1376,
        peers = {
          vpn1 = {
            public_key = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX=',
            endpoint = 'vpn1.alpha-centauri.freifunk.net:51810',
          },
          vpn2 = {
            public_key = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX=',
            endpoint = 'vpn2.alpha-centauri.freifunk.net:51810',
          },
        },
      },

      bandwidth_limit = {
        -- The bandwidth limit can be enabled by default here.
        enabled = false,

        -- Default upload limit (kbit/s).
        egress = 200,

        -- Default download limit (kbit/s).
        ingress = 3000,
      },
    }

.. _user-site-interfaces:

interfaces \: optional
  Default setup for Ethernet ports.
  ::

    interfaces = {
      lan = {
        default_roles = { 'client', 'mesh' },
      },
      wan = {
        default_roles = { 'uplink', 'mesh' },
      },
      single = {
        default_roles = { 'uplink', 'mesh' },
      },
    },

  For devices that have two distinct Ethernet ports or port groups (often
  labeled WAN and LAN), the ``lan`` and ``wan`` sections are used. When there
  is only one port (group), ``single`` is used instead.

  Available interface roles:

  - ``client``: Port allows regular clients to connect to the mesh
  - ``uplink``: Port is used to establish Mesh VPN connections
  - ``mesh``: Wired meshing to another Gluon or Gluon-compatible node

  The ``client`` role requires exclusive control over an interface. When
  the ``client`` role is assigned to an interface at the same time as other
  roles (like ``'client', 'mesh'`` in the above example), the other roles take
  precedence (enabling ``mesh``, but not ``client`` in the example). In that
  case, the ``client`` role is removed from the config of the interface.

  All interface settings are optional. If unset, the following defaults are
  used:

  - ``lan``: ``{ 'client' }``
  - ``wan``: ``{ 'uplink' }``
  - ``single``: Same as ``wan``

poe_passthrough \: optional
  Enable PoE passthrough by default on hardware with such a feature.

autoupdater \: package
  Configuration for the autoupdater feature of Gluon.

  Specifying a default branch in *site.conf* is optional. See
  :doc:`../features/autoupdater` for information how to change the behaviour
  of the autoupdater during image build.

  The mirrors are checked in random order until the manifest could be downloaded
  successfully or all mirrors have been tried.
  ::

    autoupdater = {
      branch = 'stable', -- optional
      branches = {
        stable = {
          name = 'stable',
          mirrors = {
            'http://[fdca:ffee:babe:1::fec1]/firmware/stable/sysupgrade/',
            'http://autoupdate.alpha-centauri.freifunk.net/firmware/stable/sysupgrade/',
          },
          -- Number of good signatures required
          good_signatures = 2,
          pubkeys = {
            'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX', -- someguy
            'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX', -- someother
          }
        }
      }
    }

  All configured mirrors must be reachable from the nodes via IPv6. If you don't want to set an IPv6 address
  explicitly, but use a hostname (which is recommended), see also the :ref:`FAQ <faq-dns>`.

.. _user-site-config_mode:

config_mode \: optional
  Additional configuration for the configuration web interface. All values are
  optional.

  When no hostname is specified, a default hostname based on the *hostname_prefix*
  and the node's primary MAC address is assigned. Manually setting a hostname
  can be enforced by setting *hostname.optional* to *false*.

  To not prefill the hostname-field in config-mode with the default hostname,
  set *hostname.prefill* to *false*.

  By default, no altitude field is shown by the *gluon-config-mode-geo-location*
  package. Set *geo_location.show_altitude* to *true* if you want the altitude
  field to be visible.

  The *geo_location.osm* section is only relevant when the *gluon-config-mode-geo-location-osm*
  package is used. The *center.lon* and *center.lat* values are mandatory in this case and
  define the default center of the map when no position has been picked yet. The *zoom* level
  defaults to 12 in this case.

  *openlayers_url* allows to override the base URL of the
  *build/ol.js* and *css/ol.css* files (the default is
  ``https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@35ffe7626ce16c372143f3c903950750075e7068/en/v5.3.0``).
  It is also possible to replace the default tile layer (which is OpenStreetMap)
  with a custom one using the *tile_layer* section. Only XYZ layers are supported
  at this point.

  The remote login page only shows SSH key configuration by default. A
  password form can be displayed by setting *remote_login.show_password_form*
  to true; in this case, *remote_login.min_password_length* defines the
  minimum password length.
  ::

    config_mode = {
      hostname = {
        optional = false,
        prefill = true,
      },
      geo_location = {
        show_altitude = true,
        osm = {
          center = {
            lat = 52.951947558,
            lon = 8.744238281,
          },
          zoom = 13,
          -- openlayers_url = 'http://ffac.example.org/openlayer',
          -- tile_layer = {
          --   type = 'XYZ',
          --   url = 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png',
          --   attributions = '&#169; <a href="https://www.openstreetmap.org/copyright" target="_blank">OpenStreetMap</a> contributors.',
          -- },
        },
      },
      remote_login = {
        show_password_form = true,
        min_password_length = 10,
      },
    },


roles \: optional
  Optional role definitions. Nodes will announce their role inside the mesh.
  This will allow in the backend to distinguish between normal, backbone and
  service nodes or even gateways (if they advertise that role). It is up to
  the community which roles to define. See the section below as an example.
  ``default`` takes the default role which is set initially. This value should be
  part of ``list``. If you want node owners to change the role via config mode add
  the package ``gluon-web-node-role`` to ``site.mk``.

  The strings to display in the web interface are configured per language in the
  ``i18n/en.po``, ``i18n/de.po``, etc. files of the site repository using message IDs like
  ``gluon-web-node-role:role:node`` and ``gluon-web-node-role:role:backbone``.
  ::

    roles = {
      default = 'node',
      list = {
        'node',
        'test',
        'backbone',
        'service',
      },
    },

setup_mode \: package
  Allows skipping setup mode (config mode) at first boot when attribute
  ``skip`` is set to ``true``. This is optional and may be left out.
  ::

    setup_mode = {
      skip = true,
    },

.. _user-site-build-configuration:

Build configuration
-------------------

The ``site.mk`` is a Makefile which defines various values
involved in the build process of Gluon.

GLUON_DEPRECATED
  Controls whether images for deprecated devices should be built. The following
  values are supported:

  - ``0``: Do not build any images for deprecated devices.
  - ``upgrade``: Only build sysupgrade images for deprecated devices.
  - ``full``: Build both sysupgrade and factory images for deprecated devices.

  Usually, devices are deprecated because their flash size is insufficient to
  support future Gluon versions. The recommended setting is ``0`` for new sites,
  and ``upgrade`` for existing configurations (where upgrades for existing
  deployments of low-flash devices are required). Defaults to ``0``.

GLUON_RELEASE
  The current release version Gluon should use.

GLUON_PRIORITY
  The default priority for the generated manifests (see the autoupdater documentation
  for more information).

GLUON_REGION
  Region code to build into images where necessary. Valid values are the empty string,
  ``us`` and ``eu``.

GLUON_LANGS
  List of languages (as two-letter-codes) to be included in the web interface. Should always contain
  ``en``.

.. _user-site-feature-flags:

Feature flags
^^^^^^^^^^^^^

With the addition of more and more features that interact in complex ways, it
has become necessary to split certain packages into multiple parts, so it is
possible to install just what is needed for a specific use case. One example
is the package *gluon-status-page-mesh-batman-adv*: There are batman-adv-specific
status page components; they should only be installed when both batman-adv and
the status page are enabled, making the addition of a specific package for this
combination necessary.

With the ongoing modularization, e.g. for the purpose of supporting new
routing protocols, specifying all such split packages in *site.mk* would
soon become very cumbersome: In the future, further components like
respondd support or languages might be split off as separate packages,
leading to entangled package names like *gluon-mesh-vpn-fastd-respondd* or
*gluon-status-page-mesh-batman-adv-i18n-de*.

For this reason, we have introduced *feature flags*, which can be specified
using the ``image-customization.lua`` file. These flags allow to specify
a set of features on a higher level than individual package names.

Most Gluon packages can simply be specified as feature flags by removing the ``gluon-``
prefix: The feature flag corresponding to the package *gluon-mesh-batman-adv-15* is
*mesh-batman-adv-15*.

The file ``package/features`` in the Gluon repository (or
``features`` in site feeds) can specify additional rules for deriving package lists
from feature flags, e.g. specifying both *status-page* and *mesh-batman-adv-15*
will automatically select the additional package
*gluon-status-page-mesh-batman-adv*. In the future, selecting the flags
*mesh-vpn-fastd* and *respondd* might automatically enable the additional
package *gluon-mesh-vpn-fastd-respondd*, and enabling *status-page* and
*mesh-batman-adv-15* with ``de`` in *GLUON_LANGS* could
add the package *gluon-status-page-mesh-batman-adv-i18n-de*.

In short, it is not necessary anymore to list all the individual packages that are
relevant for a firmware; instead, the package list is derived from a list of feature
flags using a flexible ruleset defined in the Gluon repo or site package feeds.
To some extent, it will even allow us to further modularize existing Gluon packages,
without necessitating changes to existing site configurations.

It is still possible to override such automatic rules by removing them using
*packages* in the ``image-customization.lua`` file
(e.g., ``features { '-gluon-status-page-mesh-batman-adv' }`` to remove
the automatically added package *gluon-status-page-mesh-batman-adv*).

For convenience, there are two feature flags that do not directly correspond to a Gluon
package:

* web-wizard

  Includes the *gluon-config-mode-...* base packages (hostname, geolocation and contact info),
  as well as the *gluon-config-mode-autoupdater* (when *autoupdater* is an enabled feature),
  and *gluon-config-mode-mesh-vpn* (when *mesh-vpn-fastd* or `mesh-vpn-wireguard` are
  enabled features)

* web-advanced

  Includes the *gluon-web-...* base packages (admin, network, WiFi config),
  as well as the *gluon-web-autoupdater* (when *autoupdater* is an enabled feature),

We recommend to include packages for non-Gluon OpenWrt packages only and
completely rely on features for Gluon packages, as it is shown in the
example *site.mk*.

.. _site-image-customization:

Image customization
^^^^^^^^^^^^^^^^^^^

Gluon allows configuration of the build parameters for the images. This
configuration must always exist to configure the basic features included in a
Gluon build.

The file ``image-customization.lua`` in the root of the site configuration is
used for this purpose, making use of a Domain Specific Language based on Lua.
See the :ref:`site-examples` section for a simple example showing both basic
setup and a device-specific alteration.

The following functions are available:

device(device_name_list)
  Returns true in case the current device is in the list of devices specified in ``device_name_list``.
  ``device_name_list`` is a table of strings.

target(openwrt_target, openwrt_subtarget)
  Returns true in case the current device is of the specified OpenWrt target and subtarget.
  The parameter ```openwrt_subtarget``` is optional. If it is not specified, only the target is matched.

device_class(dev_class)
  Returns true in case the current device is of the specified device class.

features(feature_table)
  Includes the specified list of features in the image. ``feature_table`` is a table of strings.
  These strings can be prefixed with a dash to exclude features included earlier in the file.

packages(package_table)
  Includes the specified list of packages in the image. ``package_table`` is a table of strings.
  These strings can be prefixed with a dash to exclude packages included earlier in the file.

broken(broken_state)
  Overrides the broken state specified by Gluon. Can be used to mark a device as broken or
  remove the pre-defined broken state.

disable()
  Disables image generation.

disable_factory()
  Disables factory image generation. Sysupgrade images are still generated and stored in the image
  output directory.

Technically, the image customization file is evaluated once for each device, allowing
to make use of regular Lua *if* statements for device-specific configuration as
can be seen in the example.


.. _site-config-mode-texts:

Config mode texts
-----------------

The community-defined texts in the config mode are configured in PO files in the ``i18n`` subdirectory
of the site configuration. The message IDs currently defined are:

gluon-config-mode:welcome
  Welcome text on the top of the config wizard page.

gluon-config-mode:pubkey
  Information about the public VPN key on the reboot page.

gluon-config-mode:novpn
  Information shown on the reboot page, if the mesh VPN was not selected.

gluon-config-mode:contact-help
  Description for the usage of the ``contact`` field

gluon-config-mode:contact-note
  Note shown (in small font) below the ``contact`` field

gluon-config-mode:hostname-help
  Description for the usage of the ``hostname`` field

gluon-config-mode:geo-location-help
  Description for the usage of the longitude/latitude fields (and altitude, if shown)

gluon-config-mode:altitude-label
  Label for the ``altitude`` field

gluon-config-mode:reboot
  General information shown on the reboot page.

There is a POT file in the site example directory which can be used to create templates
for the language files. The command ``msginit -l en -i ../../docs/site-example/i18n/gluon-site.pot``
can be used from the ``i18n`` directory to create an initial PO file called ``en.po`` if the ``gettext``
utilities are installed.

.. note::

  An empty ``msgstr``, as is the default after running ``msginit``, leads to
  the ``msgid`` being printed as-is. It does *not* hide the whole text, as
  might be expected.

  Depending on the context, you might be able to use comments like
  ``<!-- empty -->`` as translations to effectively hide the text.

Site modules
------------

The file ``modules`` in the site repository is completely optional and can be used
to supply additional package feeds from which packages are built. The git repositories
specified here are retrieved in addition to the default feeds when ``make update``
is called.

This file's format is very similar to the top-level ``modules`` file of the Gluon
tree, with the important different that the list of feeds must be assigned to
the variable ``GLUON_SITE_FEEDS``. Multiple feed names must be separated by spaces,
for example::

  GLUON_SITE_FEEDS='foo bar'

The feed names may only contain alphanumerical characters, underscores and slashes.
For each of the feeds, the following variables are used to specify how to update
the feed:

PACKAGES_${feed}_REPO
  The URL of the git repository to clone (usually ``git://`` or ``http(s)://``)

PACKAGES_${feed}_COMMIT
  The commit ID of the repository to use

PACKAGES_${feed}_BRANCH
  Optional: The branch of the repository the given commit ID can be found in.
  Defaults to the default branch of the repository (usually ``master``)

These variables are always all uppercase, so for an entry ``foo`` in GLUON_SITE_FEEDS,
the corresponding configuration variables would be ``PACKAGES_FOO_REPO``,
``PACKAGES_FOO_COMMIT`` and ``PACKAGES_FOO_BRANCH``. Slashes in feed names are
replaced by underscores to get valid shell variable identifiers.

.. _site-examples:

Examples
--------

site.mk
^^^^^^^

.. literalinclude:: ../site-example/site.mk
  :language: makefile

site.conf
^^^^^^^^^

.. literalinclude:: ../site-example/site.conf
  :language: lua

image-customization.lua
^^^^^^^^^^^^^^^^^^^^^^^

.. literalinclude:: ../site-example/image-customization.lua
  :language: lua

i18n/en.po
^^^^^^^^^^

.. literalinclude:: ../site-example/i18n/en.po
  :language: po

i18n/de.po
^^^^^^^^^^

.. literalinclude:: ../site-example/i18n/de.po
  :language: po

modules
^^^^^^^

.. literalinclude:: ../site-example/modules
  :language: makefile

site-repos in the wild
^^^^^^^^^^^^^^^^^^^^^^

A non-exhaustive list of site-repos from various communities can be found on the
wiki: https://github.com/freifunk-gluon/gluon/wiki/Site-Configurations