nixos/git: add lsf.enablePureSSHTransfer

Co-authored-by: Loïc Reynier <88983487+loicreynier@users.noreply.github.com>
Co-authored-by: Arne Keller <2012gdwu+github@posteo.de>
Co-authored-by: Aleksana <alexander.huang.y@gmail.com>

nixos/modules/programs/git.nix

@@ -60,6 +60,8 @@ in
         enable = lib.mkEnableOption "git-lfs (Large File Storage)";
 
         package = lib.mkPackageOption pkgs "git-lfs" { };
+
+        enablePureSSHTransfer = lib.mkEnableOption "Enable pure SSH transfer in server side by adding git-lfs-transfer to environment.systemPackages";
       };
     };
   };
@@ -72,7 +74,10 @@ in
       };
     })
     (lib.mkIf (cfg.enable && cfg.lfs.enable) {
-      environment.systemPackages = [ cfg.lfs.package ];
+      environment.systemPackages = lib.mkMerge [
+        [ cfg.lfs.package ]
+        (lib.mkIf cfg.lfs.enablePureSSHTransfer [ pkgs.git-lfs-transfer ])
+      ];
       programs.git.config = {
         filter.lfs = {
           clean = "git-lfs clean -- %f";

pkgs/by-name/gi/git-lfs-transfer/package.nix

@@ -0,0 +1,26 @@
+{
+  lib,
+  buildGoModule,
+  fetchFromGitHub,
+}:
+buildGoModule {
+  pname = "git-lfs-transfer";
+  version = "0.1.0-unstable-2024-10-07";
+
+  src = fetchFromGitHub {
+    owner = "charmbracelet";
+    repo = "git-lfs-transfer";
+    rev = "422d24414fe4b803849b3f6fe7c4d8ab1b40803b";
+    hash = "sha256-YsplPW3i4W1RfkWQI1eGXFXb3JofQwKe+9LbjxeL1cM=";
+  };
+
+  vendorHash = "sha256-1cGlhLdnU6yTqzcB3J1cq3gawncbtdgkb3LFh2ZmXbM=";
+
+  meta = {
+    description = "Server-side implementation of the Git LFS pure-SSH protocol";
+    mainProgram = "git-lfs-transfer";
+    homepage = "https://github.com/charmbracelet/git-lfs-transfer";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ chn ];
+  };
+}