git pull 报错: There are no candidates for merging among the refs that you just fetched. Generally this means that you provided a wildcard refspec which had no matches on the remote end.

gistfile1.txt

1. git status 查看状态
    On branch master
    Your branch is behind 'origin/master' by 4 commits, and can be fast-forwarded.
    (use "git pull" to update your local branch)
    nothing to commit, working directory clean

2. git pull
    Your configuration specifies to merge with the ref 'master'
    from the remote, but no such ref was fetched.

3. git pull origin master
    From ssh://xxxxxx
      * branch            master     -> FETCH_HEAD
    There are no candidates for merging among the refs that you just fetched.
    Generally this means that you provided a wildcard refspec which had no
    matches on the remote end.

纳尼，怎么会出现这种问题？把git pull拆开运行
3. git fetch origin master
    From ssh://xxxxxxx
      * branch            master     -> FETCH_HEAD

4. git merge origin/master
    error: Couldn't write .git/ORIG_HEAD.lock
    fatal: Cannot update the ref 'ORIG_HEAD'.
 
纳尼，权限检查以后没有权限问题，为毛会写不进去呢？
最后同事发现/home目录空间使用了100% 还剩20K........
删文件释放空间后解决问题。