forked from Fachschaft/nixConfig
46 lines
1.8 KiB
Nix
46 lines
1.8 KiB
Nix
{
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lib,
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config,
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...
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}: let
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inherit (lib) mapAttrsToList;
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inherit (lib.attrsets) foldAttrs concatMapAttrs;
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inherit (lib.asserts) assertMsg;
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inherit (lib.lists) filter last init;
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inherit (lib.strings) splitString toInt concatStringsSep;
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inherit (builtins) elem toString;
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hostmap = import ./hostmap.nix;
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myhostName = config.networking.hostName;
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# To turn the hostmap around suitable for networking.hosts the following simple code almost works
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# concatMapAttrs (hostname: ipData: { ${ipData.ipv4} = [hostname]; }) hostmap
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# but breaks as soon as we want to map two different names to the same ip.
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# So the code looks uglier than one would expect.
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globalhosts = foldAttrs (a: b: a ++ b) [] (mapAttrsToList (hostname: ipData: {${ipData.ipv4} = [hostname];}) hostmap);
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# We replace our own ip with 127.0.0.1 in /etc/hosts
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myhosts = concatMapAttrs (ip: hosts:
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if (elem myhostName hosts)
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# nixos maps the hostname to the loopback 127.0.0.2 by default, so we exclude it here.
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# there is also a default localhost to 127.0.0.1 in place
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then {"127.0.0.1" = filter (x: x != myhostName) hosts;}
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else {${ip} = hosts;})
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globalhosts;
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myIp = assert (assertMsg (hostmap ? ${myhostName}.ipv4) "${myhostName} has no ip configured in nixos/roles/hostmap.nix"); hostmap.${myhostName}.ipv4;
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in {
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networking = {
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hosts = myhosts;
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interfaces.enX0.ipv4.addresses = [
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{
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address = myIp;
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prefixLength = 16;
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}
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];
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defaultGateway = let
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addr = splitString "." myIp;
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addrInit = init addr;
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addrLastInt = toString (toInt (last addr) + 127);
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in
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concatStringsSep "." (addrInit ++ [addrLastInt]);
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# https://www.hrz.tu-darmstadt.de/services/it_services/nameserver_dns/index.de.jsp
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nameservers = ["130.83.22.63" "130.83.22.60" "130.83.56.60"];
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};
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}
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