Gitlab+Jenkins學習之路(一）之Git基礎

• 一、GIT基礎   

GIT是一個分佈式版本管理系統，速度快，適合大規模，跨地區多人協同開。SVN是一個集中式版本管理系統。

（1）GIT生態

GIT分佈式版本管理系統

Gitlab git私庫解決方案

Github git公有庫解決方案

 （2）Git安裝

Centos：

yum install -y git

Ubuntu：

apt-get install git

Windows安裝git bash

Linux編譯安裝

注意不要使用git 1.8如下版本，推薦使用2.7版本

①編譯安裝git
[root@linux-node1 ~]# yum install -y epel-release
安裝依賴包：
[root@linux-node1 ~]# yum install -y curl-devel expat-devel gettext-devel openssl-devel zlib-devel gcc perl-ExtUtils-MakeMaker
[root@linux-node1 ~]# wget https://github.com/git/git/archive/v2.7.4.zip
[root@linux-node1 ~]# yum install -y unzip
[root@linux-node1 ~]# unzip git-v2.7.4.zip
[root@linux-node1 ~]# cd git-2.7.4
[root@linux-node1 git-2.7.4]# make prefix=/usr/local/git all
[root@linux-node1 git-2.7.4]# make prefix=/usr/local/git install
[root@linux-node1 git-2.7.4]# rm -rf /usr/bin/git
[root@linux-node1 git-2.7.4]# ln -s /usr/local/git/bin/git /usr/bin/git
[root@linux-node1 git-2.7.4]# git --version
git version 2.7.4 ②初始化倉庫
[root@linux-node1 ~]# mkdir test
[root@linux-node1 ~]# cd test
[root@linux-node1 test]# git init    #將test目錄初始化倉庫
[root@linux-node1 test]# git config --global user.name"*****"
[root@linux-node1 test]# git config --global user.email *******@qq.com

四個區域：
遠程倉庫<-->本地倉庫<-->暫存區域<-->工做目錄

四種狀態
Untracked、Unmodified、Modified、Staged
Untracked（工做目錄）-->git add -->Staged（暫存區）-->git commit版本-->Unmodified（本地倉庫）-->Edit file-->Modified-->Stage the file-->Staged

③經常使用命令：
git add 加入暫存
git status 查看狀態
git status -s 狀態概覽
git diff 還沒有暫存的文件
git diff --staged 暫存區文件
git commit 提交更新
git reset 回滾
git rm 從版本庫中移除
git rm --cached README 從暫存區中移除
git mv 至關於mv git rm git add 三個命令

使用演示：
[root@linux-node1 test]# touch index.html    ==>建立文件
[root@linux-node1 test]# vim index.html 
[root@linux-node1 test]# git status    ==>此時文件處於工做目錄中
位於分支 master

初始提交

未跟蹤的文件:
  （使用 "git add <文件>..." 以包含要提交的內容）

    index.html

提交爲空，可是存在還沒有跟蹤的文件（使用 "git add" 創建跟蹤）
[root@linux-node1 test]# git add index.html ==>加入代碼庫
[root@linux-node1 test]# git status        ==>此時文件處於暫存區
位於分支 master

初始提交

要提交的變動：
  （使用 "git rm --cached <文件>..." 以取消暫存）

    新文件：   index.html

[root@linux-node1 test]# git commit -m "first commit"    ==>提交到本地倉庫
[master（根提交） c6bc04f] first commit
 1 file changed, 3 insertions(+)
 create mode 100644 index.html
[root@linux-node1 test]# git status
位於分支 master
無文件要提交，乾淨的工做區
[root@linux-node1 test]# git log
commit c6bc04f90d4ef442e2c4d5bc788b21de239332da    ==>回滾須要的id
Author: ****** <******@qq.com>
Date:   Fri Dec 8 22:37:40 2017 +0800

    first commit

[root@linux-node1 test]# touch pay.html
[root@linux-node1 test]# vim pay.html 
[root@linux-node1 test]# git add pay.html 
[root@linux-node1 test]# git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    new file:   pay.html

[root@linux-node1 test]# touch news.html
[root@linux-node1 test]# echo "123" > news.html 
[root@linux-node1 test]# git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    new file:   pay.html

Untracked files:
  (use "git add <file>..." to include in what will be committed)

    news.html

[root@linux-node1 test]# git add news.html 
[root@linux-node1 test]# git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    new file:   news.html
    new file:   pay.html

[root@linux-node1 test]# git rm --cached pay.html    #將pay.html從暫存區移除
rm 'pay.html'
[root@linux-node1 test]# git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    new file:   news.html

Untracked files:
  (use "git add <file>..." to include in what will be committed)

    pay.html

[root@linux-node1 test]# git commit -m "news"
[master d83603a] news
 1 file changed, 1 insertion(+)
 create mode 100644 news.html
[root@linux-node1 test]# git status
On branch master
Untracked files:
  (use "git add <file>..." to include in what will be committed)

    pay.html

nothing added to commit but untracked files present (use "git add" to track)
[root@linux-node1 test]# git log
commit d83603a56b8926630d31b46898e4b6d69293d946
Author:********
Date:   Fri Dec 8 22:48:37 2017 +0800

    news

commit c6bc04f90d4ef442e2c4d5bc788b21de239332da
Author: *****************
Date:   Fri Dec 8 22:37:40 2017 +0800

    first commit
[root@linux-node1 test]# echo "66666" >> pay.html 
[root@linux-node1 test]# git status
On branch master
Untracked files:
  (use "git add <file>..." to include in what will be committed)

    pay.html

nothing added to commit but untracked files present (use "git add" to track)
[root@linux-node1 test]# git add pay.html 
[root@linux-node1 test]# git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    new file:   pay.html

[root@linux-node1 test]# git commit -m "pay modelue"
[master e55a302] pay modelue
 1 file changed, 2 insertions(+)
 create mode 100644 pay.html
[root@linux-node1 test]# git status
On branch master
nothing to commit, working directory clean
[root@linux-node1 test]# git log
commit e55a302e11d967fd25eac1cce8b6c7bed732019b
Author:******************
Date:   Fri Dec 8 22:49:57 2017 +0800

    pay modelue

commit d83603a56b8926630d31b46898e4b6d69293d946
Author: ******************
Date:   Fri Dec 8 22:48:37 2017 +0800

    news

commit c6bc04f90d4ef442e2c4d5bc788b21de239332da
Author: ******************
Date:   Fri Dec 8 22:37:40 2017 +0800

    first commit

• 二、分支管理

[root@linux-node1 test]# git status
On branch master
nothing to commit, working directory clean

建分支,開發新功能是不能在master分支上開發
[root@linux-node1 test]# git branch about    #建立分支
[root@linux-node1 test]# git status
On branch master
nothing to commit, working directory clean
[root@linux-node1 test]# git checkout about     #切換分支
Switched to branch 'about'
[root@linux-node1 test]# git status
On branch about
nothing to commit, working directory clean
[root@linux-node1 test]# git log    #建立的分支是在master分支當前的狀態進行建立的。因此在about分支上也會有master的記錄
commit e55a302e11d967fd25eac1cce8b6c7bed732019b
Author: ************
Date:   Fri Dec 8 22:49:57 2017 +0800

    pay modelue

commit d83603a56b8926630d31b46898e4b6d69293d946
Author: ************
Date:   Fri Dec 8 22:48:37 2017 +0800

    news

commit c6bc04f90d4ef442e2c4d5bc788b21de239332da
Author: ************
Date:   Fri Dec 8 22:37:40 2017 +0800

    first commit
    
[root@linux-node1 test]# git branch
* about
  master
[root@linux-node1 test]# touch about.html
[root@linux-node1 test]# echo "about us" >> about.html
[root@linux-node1 test]# git add .
[root@linux-node1 test]# git commit -m "about"
[about 08b200a] about
 1 file changed, 1 insertion(+)
 create mode 100644 about.html
[root@linux-node1 test]# git log
[root@linux-node1 test]# git checkout master    #切換到master分支
Switched to branch 'master'
[root@linux-node1 test]# git log
[root@linux-node1 test]# git checkout about    #切換到about分支
[root@linux-node1 test]# echo "about2" > about2.html
[root@linux-node1 test]# git add .
[root@linux-node1 test]# git commit -m "about2"
[root@linux-node1 test]# git log
[root@linux-node1 test]# git checkout master
[root@linux-node1 test]# git log
[root@linux-node1 test]# git merged about    #在master分支上合併about分支
[root@linux-node1 test]# git log
[root@linux-node1 test]# git branch test    #建立test分支
[root@linux-node1 test]# git checkout test
[root@linux-node1 test]# touch "test" > test.html
[root@linux-node1 test]# git add .
[root@linux-node1 test]# git commit -m "test"
[root@linux-node1 test]# git checkout master
[root@linux-node1 test]# git branch --merged    #查看已經合併的分支
[root@linux-node1 test]# git branch --no-merged    #查看未合併的分支
 
分支命令
git branch例出分支
git branch -v
git branch --merged查看哪些分支被合併
git branch --no-merged查看哪些分支未被合併
git branch -d testling刪除分支
git checkout切換分支
git merged融合分支