pkgs.formats.libconfig: add tests for libconfig

Co-authored-by: ckie <[email protected]>

pkgs/pkgs-lib/formats/libconfig/test/comprehensive.nix

@@ -0,0 +1,69 @@
+{ pkgs, lib, stdenvNoCC, validator, ... }:
+let
+  libconfig = (pkgs.formats.libconfig { });
+
+  include_expr = {
+    val = 1;
+  };
+
+  include_file = libconfig.generate "libconfig-test-include" include_expr;
+
+  expression = {
+    simple_top_level_attr = "1.0";
+    nested.attrset.has.a.integer.value = 100;
+    some_floaty = 29.95;
+    ## Same syntax here on these two, but they should get serialized differently:
+    # > A list may have zero or more elements, each of which can be a scalar value, an array, a group, or another list.
+    list1d = libconfig.lib.mkList [ 1 "mixed!" 5 2 ];
+    # You might also omit the mkList, as a list will be a list (in contrast to an array) by default.
+    list2d = [ 1 [ 1 1.2 "foo" ] [ "bar" 1.2 1 ] ];
+    # > An array may have zero or more elements, but the elements must all be scalar values of the same type.
+    array1d = libconfig.lib.mkArray [ 1 5 2 ];
+    array2d = [
+      (libconfig.lib.mkArray [ 1 2 ])
+      (libconfig.lib.mkArray [ 2 1 ])
+    ];
+    nasty_string = "\"\n\\\t\r^*\b\f\n\0\";'''$";
+
+    weirderTypes = {
+      _includes = [ include_file ];
+      pi = 3.141592654;
+      bigint = 9223372036854775807;
+      hex = libconfig.lib.mkHex "0x1FC3";
+      octal = libconfig.lib.mkOctal "0027";
+      float = libconfig.lib.mkFloat "1.2E-3";
+      array_of_ints = libconfig.lib.mkArray [
+        (libconfig.lib.mkOctal "0732")
+        (libconfig.lib.mkHex "0xA3")
+        1234
+      ];
+      list_of_weird_types = [
+        3.141592654
+        9223372036854775807
+        (libconfig.lib.mkHex "0x1FC3")
+        (libconfig.lib.mkOctal "0027")
+        (libconfig.lib.mkFloat "1.2E-32")
+      ];
+    };
+  };
+  testLibconfig = libconfig.generate "libconfig-test.cfg" expression;
+in
+stdenvNoCC.mkDerivation {
+  name = "libconfig-test";
+  dontUnpack = true;
+  dontBuild = true;
+
+  doCheck = true;
+  checkPhase = ''
+    ${validator} ${testLibconfig} > validation.log
+  '';
+
+  json = builtins.toJSON expression;
+  passAsFile = [ "json" ];
+
+  installPhase = ''
+    mkdir -p $out
+    cp $jsonPath $out/test.json
+    ln -s ${testLibconfig} $out/test.cfg
+  '';
+}

pkgs/pkgs-lib/formats/libconfig/test/default.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+let
+  validator = pkgs.runCommandCC "libconfig-validator"
+    {
+      buildInputs = [ pkgs.libconfig ];
+    } ''
+    $CC -lconfig -x c - -o "$out" ${./validator.c}
+  '';
+in
+{
+  comprehensive = pkgs.callPackage ./comprehensive.nix { inherit validator; };
+}

pkgs/pkgs-lib/formats/libconfig/test/validator.c

@@ -0,0 +1,21 @@
+//    Copyright (C) 2005-2023  Mark A Lindner, ckie
+//    SPDX-License-Identifier: LGPL-2.1-or-later
+#include <stdio.h>
+#include <libconfig.h>
+int main(int argc, char **argv)
+{
+  config_t cfg;
+  config_init(&cfg);
+  if (argc != 2)
+  {
+    fprintf(stderr, "USAGE: validator <path-to-validate>");
+  }
+  if(! config_read_file(&cfg, argv[1]))
+  {
+    fprintf(stderr, "[libconfig] %s:%d - %s\n", config_error_file(&cfg),
+            config_error_line(&cfg), config_error_text(&cfg));
+    config_destroy(&cfg);
+    return 1;
+  }
+  printf("[libconfig] validation ok\n");
+}

pkgs/pkgs-lib/tests/default.nix

@@ -17,6 +17,7 @@ let
       jdk11 = pkgs.callPackage ../formats/java-properties/test { jdk = pkgs.jdk11_headless; };
       jdk17 = pkgs.callPackage ../formats/java-properties/test { jdk = pkgs.jdk17_headless; };
     };
+    libconfig = import ../formats/libconfig/test { inherit pkgs; };
   };
 
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