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03/18/16 NOS Conf 2016
Version control system with git
and (github) as an example
Gaurav Garg
@gaurav_garg_
ggarg@redhat.com
freenode irc nic: ggarg

03/18/16 NOS Conf 2016
Agenda
?
VCS �C What is it ?
?
Why using a VCS is good idea
?
Git Basic including:
?How to obtain and install Git
?How to use it for basic/common operation
?More information resource for Git
?
Q & A

03/18/16 NOS Conf 2016
VCS What is it ?
? A way to keep track of changes to files or folders
? Keep record of changes why, what, when
? Non distributed system (subversion, CVS)
server has the master repo, all commit goes to the server
? Distributed (Git, mercurial)
server has the master repo, but you have copy of that repo
(clone) in your machine

03/18/16 NOS Conf 2016
Getting Git
?Dependencies:
* on a system that has yum (such as fedora)
$ yum install curl-devel expat-devel gettext-devel
openssl-devel zlib-devel
* on a system that has apt-get (debian based system)
$ apt-get install libcurl4-gnutls-dev libexpat1-dev gettext
libz-dev libssl-dev

03/18/16 NOS Conf 2016
Getting Git cont...
?Get the latest snapshot from git website:
http://git-scm.com/download
Then, compile and install:
$ tar -zxf git-1.7.2.2.tar.gz
$ cd git-1.7.2.2
$ make prefix=/usr/local all
$ sudo make prefix=/usr/local install

03/18/16 NOS Conf 2016
Getting Git cont...
? Binary Installer:
If you want to directly install binary then:
�� For Fedora:
$ yum install git
�� For debina based distribution:
$ apt-get install git
�� For mac
$ brew install git

03/18/16 NOS Conf 2016
Git basic operation
?Checking the installation:
Check if Git is installed
$ git - -version
git version 1.9.3
If not then follow the installation steps that mentioned in previous slides.
? Setting user name and email to your git config:
$ git config --global user.name "Gaurav Kumar Garg"
$ git config --global user.email " ggarg@redhat.com"
Note: If you want to set it for specific repositery then cd to that repositery and
Remove ��--global�� option.
$ git config - -list command will verify user name and email address

03/18/16 NOS Conf 2016
Git basic operation cont...
? Obtaining a repository:
Creating a repository (if it does not exist remotely)
$ git init (follow http://git-scm.com/docs/git-init for more information)
Or cloning a remote repository:
git clone ssh://[username@]git.gluster.org/glusterfs.git glusterfs
For eg: cloning a gluserfs repository:
git clone ssh://ggarg@git.gluster.org/glusterfs.git glusterfs
here glusterfs is optional, which will be the name of repository.
Inspecting a repo: $ vim .git/config

03/18/16 NOS Conf 2016
? Inspecting repo:
$ git tag
will show you list of all tags (versioning of software)
$ git status
Difference b/w index file and current head commit
$ git log
Sow list of all commit with commit message
$ git log -1
Show top 1st commit
$ git log - -pretty=oneline
Show list of all commit in single line

03/18/16 NOS Conf 2016
? Making edit and commiting
? Edit your file with your fav editor (vim/emac etc.) and save it.
? $ git diff
will show delta difference code of current master HEAD and current index
? $ git status
will show path of file as ��Changes not staged for commit��
? $ git add (-A)
will show file as ��Changes to be commited��
? $ git commit -s
write your commit message. Save and exit.
* file changed, * insertion, * deletion (-)
? Check your commit by $ git log

03/18/16 NOS Conf 2016
? Recover your changes that you have added by
mistakes
$ git add <file name>
file <file name> that you have added by mistake
$ git status
$ git reset HEAD <filename>
$ git checkout - - <filename>

03/18/16 NOS Conf 2016
? Best pratice is to make seperate branch
$ git branch <branch name>
or
$ git checkout -b <branch name>
$ git branch -D <branch name>
will delete branch <branch name>
$ git branch -m <branch name> <new name>
will rename branch <branch name > with <new name>

03/18/16 NOS Conf 2016
? Git Stashing
Will allow you to save your changes without commiting them.
? $ git stash
save your change as a seperte stash@{*} branch with commit
message
? $ git stash list
will show you list of all stash with commit message
? $ git show <stash@{0}>
will show you what code difference contain this this stash@{0}
? $ git apply <stash@{0}>
will allow to apply change in current branch.

03/18/16 NOS Conf 2016
? Git rebase
forward-port local commit to local upstream master
? $ git rebase master
* will update your local commit with master
? $ git rebase -i HEAD~3
* will pick up top 3 commit and it
* can be use for reword, edit, squash commit

03/18/16 NOS Conf 2016
? Adding remote:
? $ git remote add <remote name> <remote_url>
Adding remote repo address in your local machine
user can add multiple remote repo address
? $ git remote -v
will show you list of all remote address with name
? $ git push <remote name> <branch name>
will push <branch name> change to remote address

03/18/16 NOS Conf 2016
? Git tagging
? $ git tag
* will list out all the tags (calles as versioning of
software)
? $ git tag -a <tag name> -m ��tag description��
* will give tag with tag name of tag version with
current branch HEAD
? $ git tag -d <tag name>
* Delete tag <tag name>

03/18/16 NOS Conf 2016
More information resource for Git
? $ git - -help
for eg: git - -help <rebase>
will give your help regarding ��git rebase��
? http://git-scm.com/docs/
contains resource of all git related command/operations.

03/18/16 NOS Conf 2016
Thank you....

�ݺ�ߣ

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