liminix

commit 42a315383f5c9499028c5327ba5908462611c432
parent 98cbb93109cc813c079078163cbed539ae3ba4fe
Author: Daniel Barlow <dan@telent.net>
Date:   Tue,  4 Aug 2026 21:54:41 +0100

add option to configure /etc/hosts entries

Diffstat:
M
modules/base.nix
 | 
19
+++++++++++++++----
M
tests/smoke/test.nix
 | 
11
++++++++++-

2 files changed, 25 insertions(+), 5 deletions(-)
diff --git a/modules/base.nix b/modules/base.nix
@@ -32,7 +32,14 @@ in
     system.callService = mkOption {
       type = types.functionTo (types.functionTo types.anything);
     };
-
+    hosts = mkOption {
+      type = with types; attrsOf (listOf str);
+      description = "Locally defined IP address to hostname map";
+      example = {
+        "127.0.0.1" = [ "foo.bar.baz" ];
+        "192.168.0.2" = [ "fileserver.local" "nameserver.local" ];
+      };
+    };
     filesystem = mkOption {
       type = types.anything;
       description = ''
@@ -115,6 +122,8 @@ in
   };
   imports = [ ./early ];
   config = {
+    hosts."127.0.0.1" = [ "localhost" ] ;
+
     defaultProfile.packages = with pkgs; [
       s6
       s6-init-bin
@@ -226,9 +235,11 @@ in
             ''
           );
           hosts = symlink (
-            pkgs.writeText "hosts" ''
-              127.0.0.1  localhost
-            ''
+            pkgs.writeText "hosts" (
+              lib.concatMapAttrsStringSep ""
+                (n: v: "${n}  ${lib.concatStringsSep " " v}\n")
+                config.hosts
+            )
           );
         in
         dir {
diff --git a/tests/smoke/test.nix b/tests/smoke/test.nix
@@ -2,7 +2,13 @@ let
   img =
     (import <liminix> {
       device = import <liminix/devices/qemu>;
-      liminix-config = <liminix/vanilla-configuration.nix>;
+      liminix-config = { ... }:
+        {
+          imports = [ <liminix/vanilla-configuration.nix> ];
+          config.hosts = {
+            "127.0.0.53" = [ "apple" "orange" ];
+          };
+        };
     }).outputs.rootfs;
   pkgs = import <nixpkgs> { };
 in
@@ -21,6 +27,9 @@ pkgs.runCommand "check"
     trap 'echo "command $(eval echo $BASH_COMMAND) failed with exit code $?"; exit $?' ERR
     unsquashfs -q -d $destpath -excludes ${img}  /dev
     cd $destpath;
+    hostsfile=$(echo $(readlink etc/hosts) | sed 's/^.//')
+    grep -q -E '127.0.0.1.+localhost' $hostsfile
+    grep -q -E '127.0.0.53.+apple.+orange' $hostsfile
     db=nix/store/*-s6-rc-database/compiled/
     test -d $db
     chmod -R +w $db