分支管理(解决冲突)

分支的合并不是一帆风顺的,下面就来演示下冲突解决。

准备新的feature1分支,继续我们的新分支开发:

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$ git checkout -b feature1
Switched to a new branch 'feature1'

修改README.md文件,加一句:

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Creating a new branch is quick AND simple.

在feature1分支上提交:

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$ git add README.md
$ git commit -m "add new branch 'feature1'"
[feature1 75a857c] AND simple
1 file changed, 1 insertion(+), 1 deletion(-)

切换到master分支:

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$ git checkout master
Switched to branch 'master'
Your branch is ahead of 'origin/master' by 1 commit.

Git还会自动提示我们当前master分支比远程的master分支要超前1个提交。

在master分支上把README.md文件的最后一行改为:

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Creating a new branch is quick AND simple.

提交:

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$ git add README.md
$ git commit -m "& simple"
[master 400b400] & simple
1 file changed, 1 insertion(+), 1 deletion(-)

现在,master分支和feature1分支各自都分别有新的提交,变成了这样:

icon

这种情况下,Git无法执行“快速合并”,只能试图把各自的修改合并起来,但这种合并就可能会有冲突,我们试试看:

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$ git merge feature1
Auto-merging README.md
CONFLICT (content): Merge conflict in README.md
Automatic merge failed; fix conflicts and then commit the result.

果然冲突了!Git告诉我们,README.md文件存在冲突,必须手动解决冲突后再提交。git status也可以告诉我们冲突的文件:

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$ git status
# On branch master
# Your branch is ahead of 'origin/master' by 2 commits.
#
# Unmerged paths:
# (use "git add/rm <file>..." as appropriate to mark resolution)
#
# both modified: README.md
#
no changes added to commit (use "git add" and/or "git commit -a")

查看README.md的内容:

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Git is a distributed version control system.
Git is free software distributed under the GPL.
Git has a mutable index called stage.
Git tracks changes of files.
<<<<<<< HEAD
Creating a new branch is quick & simple.
=======
Creating a new branch is quick AND simple.
>>>>>>> feature1

Git用<<<<<<<,=======,>>>>>>>标记出不同分支的内容,我们修改如下后保存:

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Creating a new branch is quick and simple.

再提交:

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$ git add README.md
$ git commit -m "conflict fixed"
[master 59bc1cb] conflict fixed

现在,master分支和feature1分支变成了下图所示:

icon

用带参数的git log也可以看到分支的合并情况:

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$ git log --graph --pretty=oneline --abbrev-commit

最后,删除feature1分支:

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$ git branch -d feature1
Deleted branch feature1 (was 75a857c).

总结

当Git无法自动合并分支时,就必须首先解决冲突。解决冲突后,再提交,合并完成。

用git log –graph命令可以看到分支合并图。

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