git 不同仓库间进行项目迁移

需求

将仓库A的某个branch的代码独立成为一个新的仓库B。并且提交的代码为当前分支最新的，且保留整个提交历史。这种需求对于git来说小菜一碟，可通过git remote命令来实现。

实现

1. 拉取仓库A当前分支(例如 master 分支)，保持其为最新的

   git pull origin master  # 拉取远程master分支的代码
   
   注：origin 代表远程仓库，其指向当前仓库的git地址, git remote 可进行查看，如下：
   $ git remote
   origin
   
   $ git remote -v
   origin  https://github.com/forgetST/blog.git (fetch)
   origin  https://github.com/forgetST/blog.git (push)

2. 创建仓库B(例如 test)，若不存在

3. 在仓库A（blog）中增加仓库B的远程地址，即git地址

   # 当前只关联了一个远程仓库A
   $ git remote -v
   origin  https://github.com/forgetST/blog.git (fetch)
   origin  https://github.com/forgetST/blog.git (push)
   
   # 关联远程仓库B(test)
   # test只是别名，可以随意起，但不能与已有远程名同名，至于原因，大家都想自己是独一无二的吗^-^
   $ git remote add test https://github.com/forgetST/test.git
   
   # 仓库test已关联成功
   $ git remote -v
   origin  https://github.com/forgetST/blog.git (fetch)
   origin  https://github.com/forgetST/blog.git (push)
   test    https://github.com/forgetST/test.git (fetch)
   test    https://github.com/forgetST/test.git (push)

4. 仓库A（blog）代码推送到仓库A（test）

   $ git push test master # 一般会失败，错误见附录
   $ git push -f test master # 强制推送，有风险，慎用

附录

git remote add 用法：

usage: git remote add [<options>] <name> <url>

    -f, --fetch           fetch the remote branches
    --tags                import all tags and associated objects when fetching
                          or do not fetch any tag at all (--no-tags)
    -t, --track <branch>  branch(es) to track
    -m, --master <branch>
                          master branch
    --mirror[=(push|fetch)]
                          set up remote as a mirror to push to or fetch from

*git push origin_name origin_branch出错 *

$ git push test master
To https://github.com/forgetST/test.git
 ! [rejected]        master -> master (fetch first)
error: failed to push some refs to 'https://github.com/forgetST/test.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.

注：当前分支有改动，可新建新的分支进行推送，新建分支不能与推送的仓库已有分支重名。或者强制推送，加选项 -f，视情况而用（慎用）。