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nixos/modules/programs/freetds.nix

@@ -0,0 +1,65 @@
+# Global configuration for freetds environment.
+
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+
+  cfg = config.environment.freetds;
+
+in
+{
+  ###### interface
+
+  options = {
+
+    environment.freetds = lib.mkOption {
+      type = lib.types.attrsOf lib.types.str;
+      default = { };
+      example = lib.literalExpression ''
+        { MYDATABASE = '''
+            host = 10.0.2.100
+            port = 1433
+            tds version = 7.2
+          ''';
+        }
+      '';
+      description = ''
+        Configure freetds database entries. Each attribute denotes
+        a section within freetds.conf, and the value (a string) is the config
+        content for that section. When at least one entry is configured
+        the global environment variables FREETDSCONF, FREETDS and SYBASE
+        will be configured to allow the programs that use freetds to find the
+        library and config.
+      '';
+
+    };
+
+  };
+
+  ###### implementation
+
+  config = lib.mkIf (builtins.length (builtins.attrNames cfg) > 0) {
+
+    environment.variables.FREETDSCONF = "/etc/freetds.conf";
+    environment.variables.FREETDS = "/etc/freetds.conf";
+    environment.variables.SYBASE = "${pkgs.freetds}";
+
+    environment.etc."freetds.conf" = {
+      text = (
+        lib.concatStrings (
+          lib.mapAttrsToList (name: value: ''
+            [${name}]
+            ${value}
+          '') cfg
+        )
+      );
+    };
+
+  };
+
+}