在 当前仓库根目录下执行命令

git submodule add https://github.com/xxx/child.git

检查仓库状态

git status

更新子库

git submodule update --remote

下拉父仓库Git并保住子库也更新

git pull --recurse-submodules

推荐使用 Githubdesktop工具

这样你可以更清楚的看到自己子库关联状态

在Unity本使用脚本调用Git

public static void NewGitCommand( string arguments, string WorkingDirectory = "./" )
    {
        string gitPath = "git";
        ProcessStartInfo startInfo = new ProcessStartInfo( gitPath, arguments )
        {
            WindowStyle = ProcessWindowStyle.Hidden,
            UseShellExecute = false,
            ErrorDialog = false,
            CreateNoWindow = true,
            RedirectStandardError = true,
            RedirectStandardInput = true,
            RedirectStandardOutput = true,
            LoadUserProfile = true,
            WorkingDirectory = WorkingDirectory
        };
        var p = new Process { StartInfo = startInfo };
        p.OutputDataReceived += new DataReceivedEventHandler( ( object sender, DataReceivedEventArgs eventArgs ) =>
        {
            if ( !string.IsNullOrEmpty( eventArgs.Data ) )
            {
                Debug.Log(eventArgs.Data);
            }
        } );
        p.ErrorDataReceived += new DataReceivedEventHandler( ( object sender, DataReceivedEventArgs eventArgs ) =>
        {
            if ( !string.IsNullOrEmpty( eventArgs.Data ) )
            {
                Debug.Log( eventArgs.Data );
            }
        } );
        p.Start();
        p.BeginOutputReadLine();
        p.WaitForExit();
        p.Close();
        p.Dispose(); 
    }

案例

   public static void InitOrUpdateSubmodule()
    {
        //Log.PINK( "Begin Update Submodule ======>" );
        NewGitCommand( "submodule update --init --recursive" );
        NewGitCommand( "pull" );
        NewGitCommand( "submodule update" );
        NewGitCommand( "submodule update --remote" );
        AssetDatabase.Refresh();
        //Log.PINK( "End Update Submodule ======>" );
    }