在线上服务器已经有文件的目录里通过以下操作：
git init git add -A git commit -m "create git repository by existing files" |
初始化了一个git仓库，并将目录下面的文件全部加入仓库版本管理库中，然后远程切出此仓库，并修改内容后，通过git push命令上传到线上服务器时，报了以下错误：
git push |
Counting objects: 6, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (5/5), done.
Writing objects: 100% (5/5), 964.60 KiB | 0 bytes/s, done.
Total 5 (delta 1), reused 0 (delta 0)
remote: error: refusing to update checked out branch: refs/heads/master
remote: error: By default, updating the current branch in a non-bare repository
remote: error: is denied, because it will make the index and work tree inconsistent
remote: error: with what you pushed, and will require 'git reset --hard' to match
remote: error: the work tree to HEAD.
remote: error:
remote: error: You can set 'receive.denyCurrentBranch' configuration variable to
remote: error: 'ignore' or 'warn' in the remote repository to allow pushing into
remote: error: its current branch; however, this is not recommended unless you
remote: error: arranged to update its work tree to match what you pushed in some
remote: error: other way.
remote: error:
remote: error: To squelch this message and still keep the default behaviour, set
remote: error: 'receive.denyCurrentBranch' configuration variable to 'refuse'.
To git@server:repo
! [remote rejected] master -> master (branch is currently checked out)
看错误提示可以知道，这是因为默认情况下，对于non-bare的git仓库拒绝了push的更新操作，要避免此问题，有以下二种方法。
方法一
可根据提示进行设置，修改线上git仓库目录下的.git/config文件，添加如下代码：
[receive] denyCurrentBranch = ignore |
方法二
另外一个方法是将线上non-bare repository仓库转换成bare repository，在线上git仓库目录下如下操作：
cd .. mv repo/.git repo.git git --git-dir=repo.git config core.bare true rm -rf repo |
从此错误也可以得到一点经验，在初始化远程仓库时最好使用git --bare init，而不要使用：git init。