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git submodule && git subtree
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Zhe Yu
April 01, 2014
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git submodule && git subtree
Zhe Yu
April 01, 2014
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Transcript
Git Subtree解说 by于哲 2014.3.31
场景 对于⼀一些⽐比较⼤大的⼯工程,为了便于复⽤用,常常需要抽取⼦子 项⺫⽬目 A B C
⽅方案1:git submodule ! ⽅方案2:git subtree
git submodule submodule项⺫⽬目和它的⽗父项⺫⽬目本质上是2个独⽴立的git仓库, 只是⽗父项⺫⽬目存储了它依赖的submodule项⺫⽬目的版本号信息⽽而已。 坑: • git pull之后,需要 git submodule
update • detached HEAD state,需要 git checkout master • git clone 之后,需要 git submodule init & update • messy,etc
git subtree 简介: 替代git submodule 命令,合并⼦子仓库到项⺫⽬目中并放在⼦子 ⺫⽬目录,管理、更新都更加⽅方便。 要求: git version
> 1.8.0.0 if git version < 1.8.0.0: go https://github.com/apenwarr/git-subtree
why git subtree? • 管理和更新流程⽐比较⽅方便 • git v1.5.2以后建议使⽤用git subtree (git
v1.8.0.0 才合并进来) cd git/contrib/subtree && make && sudo install -m 755 git-subtree /usr/lib/git-core • 仓库 clone下来不需要 init 和 update • 不会产⽣生像.gitmodule类似的⽂文件 • 可以以分⽀支形式切换依赖库
如何使⽤用git subtree? 前期准备: ! 创建本地项⺫⽬目(两个项⺫⽬目,⼀一个库): git --git-dir=proj1.git init --bare git
--git-dir=proj2.git init —bare git --git-dir=lib1.git init —bare ! ! 填充数据,提交,etc
如何使⽤用git subtree? ! ! 1. git remote add -f <⼦子仓库名>
<⼦子仓库地址> ! 其中-f意思是在添加远程仓库之后,⽴立即执⾏行fetch ! 2. git subtree add --prefix=<⼦子⺫⽬目录名> <⼦子仓库名> <分⽀支> —squash ! —squash意思是把subtree的改动合并成⼀一次commit,这样就不⽤用拉取⼦子 项⺫⽬目完整的历史记录。 ! --prefix之后的=等号也可以⽤用空格。 ! ! 添加⼦子⺫⽬目录,建⽴立与git项⺫⽬目的关联
如何使⽤用git subtree? ! ! 1. git fetch <远程仓库名> <分⽀支> !
2. git subtree pull --prefix=<⼦子⺫⽬目录名> <远程分⽀支> <分 ⽀支> --squash ! ! ! 从远程仓库更新⼦子⺫⽬目录
如何使⽤用git subtree? ! ! 1. git subtree push --prefix=<⼦子⺫⽬目录名> <远程分⽀支名>
分⽀支 ! ! ! ! ! 从⼦子⺫⽬目录push到远程仓库
git subtree原理 libs master new master
git subtree原理 • git read-tree 更新暂存区 • git write-tree 保存暂存区⺫⽬目录树
• git commit-tree porcelain瓷器 • git branch • git commit • git push • etc plumbing⽔水管
git subtree原理 • git read-tree —prefix=libs/lib1 lib1 • git write-tree
• echo "subtree merge" | git commit-tree id -p id1 -p id2 • git reset id
参考 • http://aoxuis.me/posts/2013/08/07/git-subtree/ • http://blogs.atlassian.com/2013/05/alternatives-to-git- submodule-git-subtree/ • http://www.worldhello.net/2010/10/31/2041.html
THANK YOU @jackyu