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Merge #27105: more correct form of /etc/hosts

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This commit is contained in:
Vladimír Čunát 2017-07-30 09:57:41 +02:00
commit 8177561e8f
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1 changed files with 41 additions and 3 deletions
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44
nixos/modules/config/networking.nix
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@ -20,12 +20,35 @@ in
options = {
networking.fqdn = lib.mkOption {
type = types.nullOr types.str;
default = null;
example = "foo.example.com";
description = ''
Fully qualified domain name, if any.
'';
};
networking.hosts = lib.mkOption {
type = types.attrsOf ( types.listOf types.str );
default = {};
example = literalExample ''
{
"127.0.0.1" = [ "foo.bar.baz" ];
"192.168.0.2" = [ "fileserver.local" "nameserver.local" ];
};
'';
description = ''
Locally defined maps of hostnames to IP addresses.
'';
};
networking.extraHosts = lib.mkOption {
type = types.lines;
default = "";
example = "192.168.0.1 lanlocalhost";
description = ''
Additional entries to be appended to <filename>/etc/hosts</filename>.
Additional verbatim entries to be appended to <filename>/etc/hosts</filename>.
'';
};
@ -176,6 +199,9 @@ in
config = {
warnings = optional (cfg.extraHosts != "")
"networking.extraHosts is deprecated, please use networking.hosts instead";
environment.etc =
{ # /etc/services: TCP/UDP port assignments.
"services".source = pkgs.iana-etc + "/etc/services";
@ -188,11 +214,23 @@ in
# /etc/hosts: Hostname-to-IP mappings.
"hosts".text =
let oneToString = set : ip : ip + " " + concatStringsSep " " ( getAttr ip set );
allToString = set : concatMapStringsSep "\n" ( oneToString set ) ( attrNames set );
userLocalHosts = optionalString
( builtins.hasAttr "127.0.0.1" cfg.hosts )
( concatStringsSep " " ( remove "localhost" cfg.hosts."127.0.0.1" ));
userLocalHosts6 = optionalString
( builtins.hasAttr "::1" cfg.hosts )
( concatStringsSep " " ( remove "localhost" cfg.hosts."::1" ));
otherHosts = allToString ( removeAttrs cfg.hosts [ "127.0.0.1" "::1" ]);
maybeFQDN = optionalString ( cfg.fqdn != null ) cfg.fqdn;
in
''
127.0.0.1 localhost
127.0.0.1 ${maybeFQDN} ${userLocalHosts} localhost
${optionalString cfg.enableIPv6 ''
::1 localhost
::1 ${maybeFQDN} ${userLocalHosts6} localhost
''}
${otherHosts}
${cfg.extraHosts}
'';