>svn co svn://localhost/ ./
>svn mkdir tag
>rm -rf tag
>svn ci
svn: 提交失败(细节见下)：
svn: Directory '/home/usr/svncheckout/tag' is missing
引用http://stackoverflow.com/questions/1032031/how-to-get-rid-of-missing-directories-in-svn-commit
>mkdir tag
>svn delete --force ./tag
D tag
解决。