Using the include support for deduplication

[hrzlgnm]

I've discovered a great way on how to de duplicate my configuration using includes. Even though the documentation does not say anything about the functionality of include, it's still supported.

I'm using the following approach to setup how to retrieve ipv6/ipv4 addresses and share secrets between providers:

To give you an example:

Here we define on how to retrieve the ipv6 address to be used once for all providers
/etc/inadyn/conf.d/get_ipv6_address.conf

# here i'm using the ipv6 address provided to the host running inadyn by my router 
iface = enp0s5 # can also use checkip-command or checkip-server as other means to retrieve an ip address

/etc/inadyn/conf.d/get_ipv4_address.conf

# here I'm using a custom script to retrieve the public IPv4 address from my router, to have a more private setup
checkip-command = /usr/bin/get_ipv4_from_router # can also use checkip-command or iface as other means to retrieve an ip address

/etc/inadyn/secrets/dynv6_secrets.conf

username = <dynv6-token>
password = none
hostname = { <host1>.v6.army, <host2>.v6.rocks }

/etc/inadyn/secrets/duckdns_secrets.conf

username = <duckdns-token>
password = none
hostname = { <host1>.duckdns.org, <host2>.duckdns.org }

/etc/inadyn/secrets/ipv64_secrets.conf

username = <ipv64-token>
password = none
hostname = { <host1>.ipv64.net, <host2>.ipv64.net }

Putting everything together in the main config:
/etc/inadyn.conf

allow-ipv6 = true

provider [email protected] {
      include(/etc/inadyn/conf.d/get_ipv4_address.conf)
      include(/etc/inadyn/secrets/dynv6_secrets.conf)
}

provider [email protected] {
      include(/etc/inadyn/conf.d/get_ipv6_address.conf)
      include(/etc/inadyn/secrets/dynv6_secrets.conf)
}

provider [email protected] {
      include(/etc/inadyn/conf.d/get_ipv4_address.conf)
      include(/etc/inadyn/secrets/duckdns_secrets.conf)
}

provider [email protected]{
      include(/etc/inadyn/conf.d/get_ipv6_address.conf)
      include(/etc/inadyn/secrets/ipv64_secrets.conf)
}

provider [email protected]{
      include(/etc/inadyn/conf.d/get_ipv4_address.conf)
      include(/etc/inadyn/secrets/ipv64_secrets.conf)
}

With this approach I only have to change in one location whenever those change. Or whenever I may decide to replace my router, I only need to change that in one location.