git仓库访问出错的一个解决办法（index文件错误）

亲测可用

解决思路来自地址：这里

If the problem is with the index as the staging area for commits (i.e. .git/index), you can simply remove the index (make a backup copy if you want), and then restore index to version in the last commit:

On OSX/Linux/Windows(With Git bash):

rm -f .git/index
git reset

On Windows (with CMD and not git bash):

del .git\index
git reset

(The reset command above is the same as git reset --mixed HEAD)

You can alternatively use lower level plumbing git read-tree instead of git reset.