Git submodule !Unable to checkout !应对办法

从github克隆使用了git子模块的仓库，因网络问题导致子仓库下载出错，命令行里会提示如：

Unable to checkout '726d14d02c95bb21ec9e43807751b491d295dd3c' in submodule path 'third_party/ktx'

解决办法：

1.进入子模块目录，重置

git reset --hard

2.检出确认

git checkout master

3.返回主仓库目录，查看状态；提示子仓库有修改，一般commit号不对应

$ git status
On branch master
Your branch is up to date with 'origin/master'.
 
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)
 
        modified:   third_party/ktx (new commits)

4.更新子模块，匹配commit

$ git submodule update
Submodule path 'third_party/ktx': checked out '726d14d02c95bb21ec9e43807751b491d295dd3c'

5.确认

$ git status
On branch master
Your branch is up to date with 'origin/master'.
 
nothing to commit, working tree clean