Git中合并几次commit记录

在之前Git合并代码的几个场景提到的场景1中可以将某个分支的commit记录完全复制到另外一个分支上。其中只提到的简单的将一次修改的commit记录复制到另外一个分支上，但是我们在实际开发中很有可能是需要复制好几次的commit记录，那么如果一个一个commit记录复制显示很out，那么git rebase命令就来拯救这个out的操作。

还是举个实际的例子来演示下该操作。通过git log 查看所有的提交记录

ommit f69dd44d1e9f293d36b410cf156b1f4a83cf942e
Author: wenjing.liu 
Date:   Fri Feb 15 10:43:29 2019 +0800add b activitycommit e589ee1fe861c0a8d173aa06d0fe919d4ffbc414
Author: wenjing.liu 
Date:   Fri Feb 15 10:43:04 2019 +0800add a layoutcommit ca54fef26c6c0dafaf6926b014cc7456270fbda7
Author: wenjing.liu 
Date:   Fri Feb 15 10:42:38 2019 +0800add a activitycommit f1195b95a79573c593a542d2d65d3679f40e30e6
Author: wenjing.liu 
Date:   Tue May 23 11:44:15 2017 +0800fix bug #21098

我们现在需要将add a layout合并到add a activity上面，那么git rebase -i就需要隆重出场了。

（1）执行git rebase -i commit id 命令，该commit id为需要合并的commit的上一个commit id，也就是fix bug #21098的commit id

pick ca54fef add a activity
pick e589ee1 add a layout
pick f69dd44 add b activity# Rebase f1195b9..f69dd44 onto f1195b9 (3 command(s))
#
# Commands:
# p, pick = use commit
# r, reword = use commit, but edit the commit message
# e, edit = use commit, but stop for amending
# s, squash = use commit, but meld into previous commit
# f, fixup = like "squash", but discard this commit's log message
# x, exec = run command (the rest of the line) using shell
# d, drop = remove commit
#
# These lines can be re-ordered; they are executed from top to bottom.
#
# If you remove a line here THAT COMMIT WILL BE LOST.
#
# However, if you remove everything, the rebase will be aborted.
#
# Note that empty commits are commented outick ca54fef add a activity

我们可以看到注释里面有一个命令，挑几个这次用到的

pick：执行该次提交，也就是不对这些提交发生改变

reword：执行该次提交，但是会去修改提交记录的备注内容

edit：执行该次提交，但是会去追加提交记录的备注内容

squash：执行该次提交，但是会将提交内容合并到前一个commit中

fixup：和squash相同，但是会舍弃合并分支中的commit备注内容

我们需要将add a layout合并到add a activity，所以那我们就需要修改上面的记录，将add b activity删除，将pick  add a layout改成squash add a  layout，即如下

pick ca54fef add a activity
squash e589ee1 add a layout

（2）按esc退出编辑状态，保存之后， 又跳到一个commit编辑界面：

# This is a combination of 2 commits.
# The first commit's message is:add a activity# This is the 2nd commit message:add a layout# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
#
# Date:      Fri Feb 15 10:42:38 2019 +0800
#
# interactive rebase in progress; onto f1195b9
# Last commands done (2 commands done):
#    pick ca54fef add a activity
#    squash e589ee1 add layout
# No commands remaining.
# You are currently editing a commit while rebasing branch '20170519_jingmiancao_3.8.32' on 'f1195b9'.
#
# Changes to be committed:
#	modified:   app/src/main/AndroidManifest.xml
#

（3）确认无误之后，同样保存退出编辑界面，就显示如下：

$ git rebase -i f1195b95a79573c593a542d2d65d3679f40e30e6
[detached HEAD 6572e83] pppick ca54fef add a activity pppick ca54fef add a activity pppick ca54fef add a activity pick e589ee1 add layout pick f69dd44 add b activityDate: Fri Feb 15 10:42:38 2019 +08001 file changed, 2 deletions(-)
Successfully rebased and updated refs/heads/20170519_jingmiancao_3.8.32.

说明已经合并成功，git pull  同步代码，如果有冲突解决冲突之后在提交即可。最后执行git push提交到服务器。

（4）通过git log查看，已经将两次commit记录显示成了一条。

commit 6572e83c05725a1303de7f6a5756a00b8eea4532
Author: wenjing.liu 
Date:   Fri Feb 15 10:42:38 2019 +0800add a activityadd a layoutcommit f69dd44d1e9f293d36b410cf156b1f4a83cf942e
Author: wenjing.liu 
Date:   Fri Feb 15 10:43:29 2019 +0800add b activitycommit e589ee1fe861c0a8d173aa06d0fe919d4ffbc414
Author: wenjing.liu 
Date:   Fri Feb 15 10:43:04 2019 +0800add a layoutcommit ca54fef26c6c0dafaf6926b014cc7456270fbda7
Author: wenjing.liu 
Date:   Fri Feb 15 10:42:38 2019 +0800add a activity

可以通过gitk查看这次修改的内容，发现之前add a layout和add a activity修改的内容也都在这次commit记录中了。

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