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nixos/networking: Add hostFiles option

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When blocklists are built with a derivation, using extraHosts would
require IFD, since the result of the derivation needs to be converted to
a string again.

By introducing this option no IFD is needed for such use-cases, since
the fetched files can be assigned directly.
This commit is contained in:
Silvan Mosberger 2020-03-07 01:53:31 +01:00
parent efcab647ab
commit ec6e4db6e4
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1 changed files with 21 additions and 6 deletions
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27
nixos/modules/config/networking.nix
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@ -35,12 +35,22 @@ in
''; '';
}; };
networking.hostFiles = lib.mkOption {
type = types.listOf types.path;
defaultText = lib.literalExample "Hosts from `networking.hosts` and `networking.extraHosts`";
example = lib.literalExample ''[ "''${pkgs.my-blocklist-package}/share/my-blocklist/hosts" ]'';
description = ''
Files that should be concatenated together to form <filename>/etc/hosts</filename>.
'';
};
networking.extraHosts = lib.mkOption { networking.extraHosts = lib.mkOption {
type = types.lines; type = types.lines;
default = ""; default = "";
example = "192.168.0.1 lanlocalhost"; example = "192.168.0.1 lanlocalhost";
description = '' description = ''
Additional verbatim entries to be appended to <filename>/etc/hosts</filename>. Additional verbatim entries to be appended to <filename>/etc/hosts</filename>.
For adding hosts from derivation results, use <option>networking.hostFiles</option> instead.
''; '';
}; };
@ -159,6 +169,15 @@ in
"::1" = [ "localhost" ]; "::1" = [ "localhost" ];
}; };
networking.hostFiles = let
stringHosts =
let
oneToString = set: ip: ip + " " + concatStringsSep " " set.${ip} + "\n";
allToString = set: concatMapStrings (oneToString set) (attrNames set);
in pkgs.writeText "string-hosts" (allToString (filterAttrs (_: v: v != []) cfg.hosts));
extraHosts = pkgs.writeText "extra-hosts" cfg.extraHosts;
in mkBefore [ stringHosts extraHosts ];
environment.etc = environment.etc =
{ # /etc/services: TCP/UDP port assignments. { # /etc/services: TCP/UDP port assignments.
services.source = pkgs.iana-etc + "/etc/services"; services.source = pkgs.iana-etc + "/etc/services";
@ -167,12 +186,8 @@ in
protocols.source = pkgs.iana-etc + "/etc/protocols"; protocols.source = pkgs.iana-etc + "/etc/protocols";
# /etc/hosts: Hostname-to-IP mappings. # /etc/hosts: Hostname-to-IP mappings.
hosts.text = let hosts.source = pkgs.runCommandNoCC "hosts" {} ''
oneToString = set: ip: ip + " " + concatStringsSep " " set.${ip}; cat ${escapeShellArgs cfg.hostFiles} > $out
allToString = set: concatMapStringsSep "\n" (oneToString set) (attrNames set);
in ''
${allToString (filterAttrs (_: v: v != []) cfg.hosts)}
${cfg.extraHosts}
''; '';
# /etc/host.conf: resolver configuration file # /etc/host.conf: resolver configuration file