Git Setup from Scratch

Question :  Some new developers have joined xFusionCorp Industries and have been assigned Nautilus project. They are going to start development on a new application, and some pre-requisites have been shared with the DevOps team to proceed with. Please note that all tasks need to be performed on storage server in Stratos DC.

a. Install git, set up any values for user.email and user.name globally and create a bare repository /opt/apps.git.

b. There is an update hook (to block direct pushes to master branch) under /tmp on storage server itself; use the same to block direct pushes to master branch in /opt/apps.git repo.

c. Clone /opt/apps.git repo in /usr/src/kodekloudrepos/apps directory.

d. Create a new branch xfusioncorp_apps in repo that you cloned in /usr/src/kodekloudrepos.

e. There is a readme.md file in /tmp on storage server itself; copy that to repo, add/commit in the new branch you created, and finally push your branch to origin.

f. Also create master branch from your branch and remember you should not be able to push to master as per hook you have set up.

Please Note:-  Perform the below commands based on your question server,  user name & other details that might differ. So please read the task carefully before executing it. All the Best 👍

Solution:  

1. At first login on to the storage server & Switch to the root user 

thor@jump_host ~$ ssh natasha@ststor01 The authenticity of host 'ststor01 (172.16.238.15)' can't be established. ECDSA key fingerprint is SHA256:f6jRsuSNDtAzqGH07DEf/j413JApdFsLZOx2fSSjZtg. ECDSA key fingerprint is MD5:46:41:eb:b5:bd:7f:4c:77:50:ee:8b:00:92:2a:2a:82. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'ststor01,172.16.238.15' (ECDSA) to the list of known hosts. natasha@ststor01's password: [natasha@ststor01 ~]$ sudo su -  We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things:      #1) Respect the privacy of others.     #2) Think before you type.     #3) With great power comes great responsibility.  [sudo] password for natasha: [root@ststor01 ~]#

2. Install Git package 

[root@ststor01 ~]# yum install -y git Loaded plugins: fastestmirror, ovl Determining fastest mirrors  * base: mirrors.gigenet.com  * extras: linux-mirrors.fnal.gov  * updates: www.gtlib.gatech.edu base                                                                                                                | 3.6 kB  00:00:00     extras                                                                                                              | 2.9 kB  00:00:00     updates                                                                                                             | 2.9 kB  00:00:00     (1/4): base/7/x86_64/group_gz                                                                                       | 153 kB  00:00:00     (2/4): extras/7/x86_64/primary_db                                                                                   | 242 kB  00:00:00     (3/4): base/7/x86_64/primary_db                                                                                     | 6.1 MB  00:00:00     (4/4): updates/7/x86_64/primary_db                                                                                  | 8.8 MB  00:00:01     Resolving Dependencies --> Running transaction check ---> Package git.x86_64 0:1.8.3.1-23.el7_8 will be installed --> Processing Dependency: perl-Git = 1.8.3.1-23.el7_8 for package: git-1.8.3.1-23.el7_8.x86_64 --> Processing Dependency: perl >= 5.008 for package: git-1.8.3.1-23.el7_8.x86_64 --> Processing Dependency: rsync for package: git-1.8.3.1-23.el7_8.x86_64 Install  1 Package (+35 Dependent packages)  Total download size: 18 M Installed size: 66 M Downloading packages: (1/36): groff-base-1.22.2-8.el7.x86_64.rpm                                                                          | 942 kB  00:00:00     (2/36): git-1.8.3.1-23.el7_8.x86_64.rpm                                                                             | 4.4 MB  00:00:00     (3/36): libedit-3.0-12.20121213cvs.el7.x86_64.rpm                                                                   |  92 kB  00:00:00     (4/36): less-458-9.el7.x86_64.rpm                                                                                   | 120 kB  00:00:00     (5/36): perl-Carp-1.26-244.el7.noarch.rpm                                                                           |  19 kB  00:00:00 Installed:   git.x86_64 0:1.8.3.1-23.el7_8                                                                                                              Dependency Installed:     perl-constant.noarch 0:1.27-2.el7           perl-libs.x86_64 4:5.16.3-299.el7_9         perl-macros.x86_64 4:5.16.3-299.el7_9            perl-parent.noarch 1:0.225-244.el7          perl-podlators.noarch 0:2.5.1-3.el7         perl-threads.x86_64 0:1.87-4.el7                 perl-threads-shared.x86_64 0:1.43-6.el7     rsync.x86_64 0:3.1.2-10.el7                 Complete! [root@ststor01 ~]#

3. Setup git config for the user.email and user.name globally    

[root@ststor01 ~]# git config --global --add user.name natasha [root@ststor01 ~]# git config --global --add user.email natasha@stratos.xfusioncorp.com [root@ststor01 ~]#

4. Create a bare repository

[root@ststor01 ~]# git init --bare /opt/apps.git Initialized empty Git repository in /opt/apps.git/ [root@ststor01 ~]#

5. Copy the /tmp/update hook to hooks directory under /opt/apps.git

    

[root@ststor01 ~]#  cp /tmp/update  /opt/apps.git/hooks/ [root@ststor01 ~]#

6. clone git repository under /usr/src/kodekloudrepos/  directory.

[root@ststor01 kodekloudrepos]# cd /usr/src/kodekloudrepos/ [root@ststor01 kodekloudrepos]#  git clone  /opt/apps.git Cloning into 'apps'... warning: You appear to have cloned an empty repository. done. [root@ststor01 kodekloudrepos]# ll total 4 drwxr-xr-x 3 root root 4096 Jul 20 16:33 apps [root@ststor01 kodekloudrepos]#

7. Navigate to the clone directory /usr/src/kodekloudrepos/apps

[root@ststor01 kodekloudrepos]# cd apps [root@ststor01 apps]#

8. Create a new branch as per the task  in the repo that you cloned 

[root@ststor01 apps]# git checkout -b xfusioncorp_apps Switched to a new branch 'xfusioncorp_apps' [root@ststor01 apps]#

 9. There is a readme.md file in /tmp , copy that to repo, add/commit in the new branch and finally push your branch to origin.  ( Refer Below Video for more clarity ) 

[root@ststor01 apps]# cp /tmp/readme.md . [root@ststor01 apps]# ll total 4 -rw-r--r-- 1 root root 33 Jul 20 16:36 readme.md [root@ststor01 apps]# git add readme.md [root@ststor01 apps]# git commit -m "Readme file" [xfusioncorp_apps (root-commit) d277390] Readme file  1 file changed, 1 insertion(+)  create mode 100644 readme.md [root@ststor01 apps]# git push origin xfusioncorp_apps Counting objects: 3, done. Writing objects: 100% (3/3), 251 bytes | 0 bytes/s, done. Total 3 (delta 0), reused 0 (delta 0) To /opt/apps.git  * [new branch]      xfusioncorp_apps -> xfusioncorp_apps [root@ststor01 apps]#

10. To validate the task switch to  master branch and attempt a push to origin . 

        You should get an error hook declined     

[root@ststor01 apps]# git checkout -b master Switched to a new branch 'master' [root@ststor01 apps]# [root@ststor01 apps]# git branch * master   xfusioncorp_apps [root@ststor01 apps]# git push origin master Total 0 (delta 0), reused 0 (delta 0) remote: Manual pushing to this repo's master branch is restricted remote: error: hook declined to update refs/heads/master To /opt/apps.git  ! [remote rejected] master -> master (hook declined) error: failed to push some refs to '/opt/apps.git' [root@ststor01 apps]#

11.  Click on Finish & Confirm to complete the task successful

Happy Learning!!!!

Apart from this if you need more clarity,  I have made a  tutorial video on this , 

please go through and share your comments. Like and share the knowledge