git gui :Updating the Git index failed. A rescan will be automatically started to res

这个是由于unix系统的换行符和windows的换行符不一致造成的结果。你在安装git的时候，设置了成使用LF，即unix换行符，可是你是在windows下进行文件编辑的，所以会出现上面的警告。其实这也没什么问题的，git只是自动帮你将windows换行符替换为Unix换行符。

I faced similar issues and decided to have a closer look to my configuration.

New Line Characters on Windows / Linux / MAC:

Don't panic. Git can handle the conversion between platforms for you.

Git should store the line ending as LF in the repo.

Set it to;

TRUE - If you are on Windows:

git config --global core.autocrlf true

This converts LF endings into CRLF when you check out code.

INPUT - If you are on a MAC/LINUX:

You don't need to convert anything, Git uses LF and your MAC uses LF.

But, you can tell git to convert any CRLF if one pass through:

git config --global core.autocrlf input

False - Not recommened

I don't recommend this, but just for the sake of this explanation:

If you are a windows dev only working on windows machine and you are 100% sure you will never work with people on MAC:

git config --global core.autocrlf false

UPDATE:

As commented below, I didn't mention the .gitattributes where one can default these settings for a project.