Git Submodule使用完整教程(小结)(7)

➜ henryyan@hy-hp ~/submd/ws/project1-b git:(master) cd ../project1 ➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) git pull remote: Counting objects: 5, done. remote: Compressing objects: 100% (3/3), done. remote: Total 3 (delta 0), reused 0 (delta 0) Unpacking objects: 100% (3/3), done. From /home/henryyan/submd/ws/../repos/project1 7157977..c96838a master -> origin/master Updating 7157977..c96838a Fast-forward libs/lib1 | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) ➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) ✗ git status # On branch master # Changes not staged for commit: # (use "git add <file>..." to update what will be committed) # (use "git checkout -- <file>..." to discard changes in working directory) # # modified: libs/lib1 (new commits) # no changes added to commit (use "git add" and/or "git commit -a") </file></file>

我们运行了git pull命令和git status获取了最新的仓库源码，然后看到了状态时modified，这是为什么呢？

我们用git diff比较一下不同：

➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) ✗ git diff diff --git a/libs/lib1 b/libs/lib1 index 36ad12d..c22aff8 160000 --- a/libs/lib1 +++ b/libs/lib1 @@ -1 +1 @@ -Subproject commit 36ad12d40d8a41a4a88a64add27bd57cf56c9de2 +Subproject commit c22aff85be91eca442734dcb07115ffe526b13a1 从diff的结果分析出来时因为submodule的commit id更改了，我们前面刚刚讲了要在主项目更新submodule的内容首先要提交submdoule的内容，然后再更新主项目中引用的submodulecommit id；现在我们看到的不同就是因为刚刚更改了project1-b的submodule commit id；好的，我来学习一下怎么更新project1的公共类库。 follow me…… ➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) ✗ git submodule update ➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) ✗ git status # On branch master # Changes not staged for commit: # (use "git add <file>..." to update what will be committed) # (use "git checkout -- <file>..." to discard changes in working directory) # # modified: libs/lib1 (new commits) # no changes added to commit (use "git add" and/or "git commit -a") </file></file>

泥马，为什么没有更新？git submodule update命令不是更新子模块仓库的吗？

别急，先听我解释；因为子模块是在project1中引入的，git submodule add ~/submd/repos/lib1.git libs/lib1命令的结果，操作之后git只是把lib1的内容clone到了project1中，但是没有在仓库注册，证据如下：

➜ henryyan@hy-hp ~/submd2/ws/project1 git:(master) ✗ cat .git/config [core] repositoryformatversion = 0 filemode = true bare = false logallrefupdates = true [remote "origin"] fetch = +refs/heads/*:refs/remotes/origin/* url = /home/henryyan/submd/ws/../repos/project1.git [branch "master"] remote = origin merge = refs/heads/master

我们说过git submodule init就是在.git/config中注册子模块的信息，下面我们试试注册之后再更新子模块：

➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) ✗ git submodule init Submodule 'libs/lib1' (/home/henryyan/submd/repos/lib1.git) registered for path 'libs/lib1' Submodule 'libs/lib2' (/home/henryyan/submd/repos/lib2.git) registered for path 'libs/lib2' ➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) ✗ git submodule update remote: Counting objects: 5, done. remote: Total 3 (delta 0), reused 0 (delta 0) Unpacking objects: 100% (3/3), done. From /home/henryyan/submd/repos/lib1 c22aff8..36ad12d master -> origin/master Submodule path 'libs/lib1': checked out '36ad12d40d8a41a4a88a64add27bd57cf56c9de2' ➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) cat .git/config [core] repositoryformatversion = 0 filemode = true bare = false logallrefupdates = true [remote "origin"] fetch = +refs/heads/*:refs/remotes/origin/* url = /home/henryyan/submd/ws/../repos/project1.git [branch "master"] remote = origin merge = refs/heads/master [submodule "libs/lib1"] url = /home/henryyan/submd/repos/lib1.git [submodule "libs/lib2"] url = /home/henryyan/submd/repos/lib2.git ➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) cat libs/lib1/lib1-features I'm lib1. add by developer B

上面的结果足以证明刚刚的推断，所以记得当需要更新子模块的内容时请先确保已经运行过git submodule init。

2.5 为project2添加lib1和lib2

这个操作对于读到这里的你来说应该是轻车熟路了，action：

➜ henryyan@hy-hp ~/submd/ws/project1 git:(master) cd ~/submd/ws/project2 ➜ henryyan@hy-hp ~/submd/ws/project2 git:(master) git submodule add ~/submd/repos/lib1.git libs/lib1 Cloning into libs/lib1... done. ➜ henryyan@hy-hp ~/submd/ws/project2 git:(master) ✗ git submodule add ~/submd/repos/lib2.git libs/lib2 zsh: correct 'libs/lib2' to 'libs/lib1' [nyae]? n Cloning into libs/lib2... done. ➜ henryyan@hy-hp ~/submd/ws/project2 git:(master) ✗ ls libs project-infos.txt ➜ henryyan@hy-hp ~/submd/ws/project2 git:(master) ✗ git submodule init Submodule 'libs/lib1' (/home/henryyan/submd/repos/lib1.git) registered for path 'libs/lib1' Submodule 'libs/lib2' (/home/henryyan/submd/repos/lib2.git) registered for path 'libs/lib2' ➜ henryyan@hy-hp ~/submd/ws/project2 git:(master) ✗ git status # On branch master # Changes to be committed: # (use "git reset HEAD <file>..." to unstage) # # new file: .gitmodules # new file: libs/lib1 # new file: libs/lib2 # ➜ henryyan@hy-hp ~/submd/ws/project2 git:(master) ✗ git commit -a -m "add lib1 and lib2" [master 8dc697f] add lib1 and lib2 3 files changed, 8 insertions(+), 0 deletions(-) create mode 100644 .gitmodules create mode 160000 libs/lib1 create mode 160000 libs/lib2 ➜ henryyan@hy-hp ~/submd/ws/project2 git:(master) git push Counting objects: 5, done. Delta compression using up to 2 threads. Compressing objects: 100% (4/4), done. Writing objects: 100% (4/4), 471 bytes, done. Total 4 (delta 0), reused 0 (delta 0) Unpacking objects: 100% (4/4), done. To /home/henryyan/submd/ws/../repos/project2.git 6e15c68..8dc697f master -> master </file>

我们依次执行了添加submodule并commit和push到仓库，此阶段任务完成。

2.6 修改lib1和lib2并同步到project1和project2

假如开发人员C同时负责project1和project2，有可能在修改project1的某个功能的时候发现lib1或者lib2的某个组件有bug需要修复，这个需求多模块和大型系统中经常遇到，我们应该怎么解决呢？

假如我的需求如下：

在lib1中添加一个文件：README，用来描述lib1的功能

在lib2中的lib2-features文件中添加一写文字：学习Git submodule的修改并同步功能

2.6.1 在lib1中添加一个文件：README

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