TIP

git的存储功能

开发中,bug就像家常便饭一样。有了bug就需要修复,在Git中,犹豫分支是如此强大,所以,每个分支都可以通过一个新的临时分支来修复,修复后,合并分支,然后将临时分支删除。

当你接到一个修复一个代号101的bug的任务时,很自然的,你想创建一个分支issue-101来修复它, 但是等等,当前正在dev上进行的工作还没提交

$ git status
# On branch dev
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#       new file:   hello.py
#
# 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:   readme.txt
#

并不是你不想提交,而是工作只进行到一半,还没发提交,预计完成需1天事件。但是必须在两个小时内修复改bug 怎么办?

Git还提供了一个stash功能,可以把当前工作现场储藏起来,等你恢复现场后继续工作

$ git stash
Saved working directory and index state WIP on dev: 6224937 add merge
HEAD is now at 6224937 add merge

现在,用git status查看工作去,就是干净的(除非有没有被Git管理的文件),因此可以放心的创建分支来修复bug。

首先确定要在哪个分支上修复bug,假定需要在master分支上修复,就从master创建临时分支:

$ git checkout master
Switched to branch 'master'
Your branch is ahead of 'origin/master' by 6 commits.
$ git checkout -b issue-101
Switched to a new branch 'issue-101'

现在修复bug,需要把“Git is free software ...”改为“Git is a free software ...”,然后提交:

$ git add readme.txt 
$ git commit -m "fix bug 101"
[issue-101 cc17032] fix bug 101
 1 file changed, 1 insertion(+), 1 deletion

修复完成后,切换到master分支,并完成合并,最后删除issue-101分支:

$ git checkout master
Switched to branch 'master'
Your branch is ahead of 'origin/master' by 2 commits.
$ git merge --no-ff -m "merged bug fix 101" issue-101
Merge made by the 'recursive' strategy.
 readme.txt |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
$ git branch -d issue-101
Deleted branch issue-101 (was cc17032).

太棒了,原计划两个小时的bug修复只花了5分钟!现在,是时候接着回到dev分支干活了!


$ git checkout dev
Switched to branch 'dev'
$ git status
# On branch dev
nothing to commit (working directory clean)

工作区是干净的,刚才的工作现场存到哪去了?用git stash list命令看看:

$ git stash list
stash@{0}: WIP on dev: 6224937 add merge

工作现场还在,Git把stash内容存在某个地方了,但是需要恢复一下,有两个办法:

一是用git stash apply恢复,但是恢复后,stash内容并不删除,你需要用git stash drop来删除;

另一种方式是用git stash pop,恢复的同时把stash内容也删了:

$ git stash pop
# On branch dev
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#       new file:   hello.py
#
# 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:   readme.txt
#
Dropped refs/stash@{0} (f624f8e5f082f2df2bed8a4e09c12fd2943bdd40

再用git stash list查看,就看不到任何stash内容了:

git stash list

你可以多次stash,回复的时候,先用git stash list查看,然后回复指定的stash 用命令:

git stash apply stash@{0}

修复bug时,我们会通过创建新的bug分支来进行修复,然后合并,最后删除; 当手头工作没有完成时,先把工作现场git stash一下,然后去修复bug,修复后,在git stash pop,回到工作现场

git stash  # 暂存状态
git stash list #查看缓存列表
git stash clear # 清空你所有的内容
git stash drop stash@{0} # 这是删除第一个队列