svn: Could not use external editor to fetch log message; consider
setting the $SVN_EDITOR environment variable or using the --message
(-m) or --file (-F) options
svn: None of the environment variables SVN_EDITOR, VISUAL or EDITOR is
set, and no 'editor-cmd' run-time configuration option was found
原因是： 没有设置svn编辑器的环境变量，主要是import、commit中填写comment要用
解决办法：
编辑 /etc/bashrc 文件，加入如下一行：
export SVN_EDITOR=vim