git push origin master出现如下错误：

Counting objects: , done.
Writing objects: % (/),  bytes, done.
Total  (delta ), reused  (delta )
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@192.168.45.42:teamwork.git
 ! [remote rejected] master -> master (branch is currently checked out)
error: failed to push some refs to 'git@192.168.45.42:teamwork.git'

执行命令解决问题
git config receive.denyCurrentBranch ignore  

git pull出现如下错误：
You asked me to pull without telling me which branch you
want to merge with, and 'branch.master.merge' in
your configuration file does not tell me, either. Please
specify which branch you want to use on the command line and
try again (e.g. 'git pull <repository> <refspec>').
See git-pull() for details.

If you often merge with the same branch, you may want to
use something like the following in your configuration file:

    [branch "master"]
    remote = <nickname>
    merge = <remote-ref>

    [remote "<nickname>"]
    url = <url>
    fetch = <refspec>

See git-config() for details.

执行命令：
$ git config branch.master.remote origin
$ git config branch.master.merge refs/heads/master  

解决问题