情景，本地git与远程Git仓库同步

Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit
$ git init
Initialized empty Git repository in D:/workspace/learngit/.git/Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git remote add origin git@github.com:ZhuBaker/learngit.gitAdministrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git push -u origin master
error: src refspec master does not match any.
error: failed to push some refs to 'git@github.com:ZhuBaker/learngit.git'

原因分析

引起该错误的原因是，目录中没有文件，空目录是不能提交上去的

解决方法

Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ touch READMYFILE
Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git add READMYFILEAdministrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git commit -m 'add READMYFILE'
[master (root-commit) 28ed8af] add READMYFILE1 file changed, 0 insertions(+), 0 deletions(-)create mode 100644 READMYFILEAdministrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git push -u origin master
To github.com:ZhuBaker/learngit.git! [rejected]        master -> master (fetch first)
error: failed to push some refs to 'git@github.com:ZhuBaker/learngit.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

提示首先要fetch 代码  或者 git pull

或者是强推  git push -f

Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git pull origin master
From github.com:ZhuBaker/learngit* branch            master     -> FETCH_HEAD
fatal: refusing to merge unrelated histories

提示拒绝merge两个不相关的git

因为他们是两个不同的项目，要把两个不同的项目合并，git需要添加一句代码，在git pull，这句代码是在git 2.9.2版本发生的，最新的版本需要添加--allow-unrelated-histories

假如我们的源是origin，分支是master，那么我们 需要这样写git pull origin master --allow-unrelated-histories需要知道，我们的源可以是本地的路径

Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git pull origin master --allow-unrelated-histories
From github.com:ZhuBaker/learngit* branch            master     -> FETCH_HEAD
Merge made by the 'recursive' strategy.abc.txt | 0dd      | 1 +ddd.txt | 03 files changed, 1 insertion(+)create mode 100644 abc.txtcreate mode 100644 ddcreate mode 100644 ddd.txt
Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ ls
abc.txt  dd  ddd.txt  READMYFILE

Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.git pull <remote> <branch>If you wish to set tracking information for this branch you can do so with:git branch --set-upstream-to=origin/<branch> master

直接使用git pull 命令会提示该提示：

让我们使用 git pull 或者 建立本地分支与远程分支的关联才能使用

Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git branch --set-upstream-to=origin/master master
Branch master set up to track remote branch master from origin.Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git pull
Already up-to-date.Administrator@EZ-20170513RQHH MINGW32 /d/workspace/learngit (master)
$ git push
Counting objects: 4, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (4/4), 465 bytes | 0 bytes/s, done.
Total 4 (delta 1), reused 0 (delta 0)
remote: Resolving deltas: 100% (1/1), completed with 1 local object.
To github.com:ZhuBaker/learngit.git6af3724..c01f0f2  master -> master