git: allow contents in git.includes

(cherry picked from commit 6da88339f5)

modules/programs/git.nix

@@ -34,7 +34,7 @@ let
     };
   };
 
-  includeModule = types.submodule {
+  includeModule = types.submodule ({ config, ... }: {
     options = {
       condition = mkOption {
         type = types.nullOr types.str;
@@ -50,12 +50,24 @@ let
       };
 
       path = mkOption {
-        type = types.str;
+        type = with types; either str path;
         description = "Path of the configuration file to include.";
       };
+
+      contents = mkOption {
+        type = types.attrs;
+        default = {};
+        description = ''
+          Configuration to include. If empty then a path must be given.
+        '';
       };
     };
 
+    config.path = mkIf (config.contents != {}) (
+      mkDefault (pkgs.writeText "contents" (generators.toINI {} config.contents))
+    );
+  });
+
 in
 
 {

tests/modules/programs/git-expected.conf

@@ -29,3 +29,6 @@ path = ~/path/to/config.inc
 
 [includeIf "gitdir:~/src/dir"]
 path = ~/path/to/conditional.inc
+
+[includeIf "gitdir:~/src/dir"]
+path = @git_include_path@

tests/modules/programs/git.nix

@@ -1,7 +1,24 @@
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
 
 with lib;
 
+let
+
+  gitInclude = {
+    user = {
+      name = "John Doe";
+      email = "user@example.org";
+    };
+  };
+
+  substituteExpected = path: pkgs.substituteAll {
+    src = path;
+
+    git_include_path = pkgs.writeText "contents" (generators.toINI {} gitInclude);
+  };
+
+in
+
 {
   config = {
     programs.git = mkMerge [
@@ -23,6 +40,10 @@ with lib;
             path = "~/path/to/conditional.inc";
             condition = "gitdir:~/src/dir";
           }
+          {
+            condition = "gitdir:~/src/dir";
+            contents = gitInclude;
+          }
         ];
         signing = {
           gpgPath = "path-to-gpg";
@@ -43,7 +64,7 @@ with lib;
 
     nmt.script = ''
       assertFileExists home-files/.config/git/config
-      assertFileContent home-files/.config/git/config ${./git-expected.conf}
+      assertFileContent home-files/.config/git/config ${substituteExpected ./git-expected.conf}
     '';
   };
 }