sftpgo: adjust file mode to be compatible with Kodi

hosts/by-name/servo/services/export/sftpgo.nix

@@ -56,6 +56,29 @@ in
   services.sftpgo = {
     enable = true;
     group = "export";
+
+    package = lib.warnIf (lib.versionOlder "2.5.6" pkgs.sftpgo.version) "sftpgo update: safe to use nixpkgs' sftpgo but keep my own `patches`" pkgs.buildGoModule {
+      inherit (pkgs.sftpgo) name ldflags nativeBuildInputs doCheck subPackages postInstall passthru meta;
+      version = "2.5.6-unstable-2024-04-18";
+      src = pkgs.fetchFromGitHub {
+        # need to use > 2.5.6 for sftpgo_safe_fileinfo.patch to apply
+        owner = "drakkan";
+        repo = "sftpgo";
+        rev = "950cf67e4c03a12c7e439802cabbb0b42d4ee5f5";
+        hash = "sha256-UfiFd9NK3DdZ1J+FPGZrM7r2mo9xlKi0dsSlLEinYXM=";
+      };
+      vendorHash = "sha256-n1/9A2em3BCtFX+132ualh4NQwkwewMxYIMOphJEamg=";
+      patches = (pkgs.sftpgo.patches or []) ++ [
+        # fix for compatibility with kodi:
+        # ftp LIST operation returns entries over-the-wire like:
+        # - dgrwxrwxr-x 1 ftp ftp            9 Apr  9 15:05 Videos
+        # however not all clients understand all mode bits (like that `g`, indicating SGID / group sticky bit).
+        # instead, only send mode bits which are well-understood.
+        # the full set of bits, from which i filter, is found here: <https://pkg.go.dev/io/fs#FileMode>
+        ./sftpgo_safe_fileinfo.patch
+      ];
+    };
+
     settings = {
       ftpd = {
         bindings = [

hosts/by-name/servo/services/export/sftpgo_safe_fileinfo.patch

@@ -0,0 +1,32 @@
+diff --git a/internal/ftpd/handler.go b/internal/ftpd/handler.go
+index 036c3977..33211261 100644
+--- a/internal/ftpd/handler.go
++++ b/internal/ftpd/handler.go
+@@ -169,7 +169,7 @@ func (c *Connection) Stat(name string) (os.FileInfo, error) {
+ 		}
+ 		return nil, err
+ 	}
+-	return fi, nil
++	return vfs.NewFileInfo(name, fi.IsDir(), fi.Size(), fi.ModTime(), false), nil
+ }
+
+ // Name returns the name of this connection
+@@ -315,7 +315,17 @@ func (c *Connection) ReadDir(name string) (ftpserver.DirLister, error) {
+ 		}, nil
+ 	}
+
+-	return c.ListDir(name)
++	lister, err := c.ListDir(name)
++	if err != nil {
++		return nil, err
++	}
++	return &patternDirLister{
++		DirLister:      lister,
++		pattern:        "*",
++		lastCommand:    c.clientContext.GetLastCommand(),
++		dirName:        name,
++		connectionPath: c.clientContext.Path(),
++	}, nil
+ }
+
+ // GetHandle implements ClientDriverExtentionFileTransfer