We have seen the
basics of Git and how to create a basic repository and commit files. In this
next article we will see the advanced topics of git.
Git Configuration –
In order to communicate with the remote repository from our local repository we
need to configure user name and email so that git repository will identify who
has done operations on the repository. In order to configure those use the
below commands as,
git config --global
user.name <user Name>
git config --global
user.email <Email ID>
Remote Repository
Details – Though we have the local repository we need to have a remote
repository where we can push our changes so that other can access them. In
order to do this, we need to first add the remote Repository URL. This can be
done by using
git config
remote.origin.url https://github.com/abc/abc.git
Once the remote
repository is set, we can get the details using
[root@vx111a master]# git config remote.origin.url
https://github.com/abc/abc.git
Configuration
Details
In order to get the
configuration details like user.name and email etc, we can get those details
using
[root@vx111a master]# git config -l
user.name=jagadish12
user.email=jagadesh.manchala@gmail.com
core.repositoryformatversion=0
core.filemode=true
core.bare=false
core.logallrefupdates=true
remote.origin.url=https://github.com/abc/abc.git
Remote Location
Details
In order to view
the remote location details we can use,
[root@vx111a
Mytest]# git remote -v
origin https://github.com/jagadish12/MyTest.git
(fetch)
origin https://github.com/jagadish12/MyTest.git
(push)
[root@vx111a
Mytest]# git ls-remote --get-url origin
Clone a Repository
Cloning is nothing
but a way to access a repository. Checking-out in SVN is similar to Cloning in
GIT. Running git clone <repository URL> will pull in a complete copy of
the remote repository to your local system. Now you can work away on it, making
changes, staging them, committing them, and pushing the changes back. We can
clone using
[root@vx111a test]#
git clone https://github.com/jagadish12/SampleTest.git
Cloning into
'SampleTest'...
remote: Counting
objects: 24, done.
remote: Compressing
objects: 100% (16/16), done.
remote: Total 24
(delta 1), reused 24 (delta 1), pack-reused 0
Unpacking objects:
100% (24/24), done.
Branching
We need to make
sure that our master repository is always clean. Clean in the sense with out
any changes. For the changes that we are doing before moving them to the master
we need to make sure that we create a branch of the code and make the changes
to the branch. Creating branches in git is done using
[root@vx111a]# git
checkout -b test
Switched to a new
branch 'test'
Check the Branch
Status -
[root@vx111a]# git
status
# On branch test
nothing to commit,
working directory clean
Check the available
branches -
[root@vx111a]# git
branch
master
* test
Delete the whole
branch using
[root@vx111a]# git
checkout master
[root@vx111a]# git
branch -D test
For deleting we
need to first move out of branch and then we need to delete that branch
When you do a pull
request on a branch, you can continue to work on another branch and make
another pull request on this other branch.
Merging
Once your feature
is finished, you’ll want to merge your branch back to the master branch. This
is way easier than it would be in Subversion. You just execute:
git checkout master
git merge <feature_branch>
If there are
conflicts, you will be prompted to fix them. Add the conflict fixes to the
changeset with git add, and then commit.
Git add and Commit
Once the changes
are done, we need to first make sure the changes are added to the local
repository and then once added need to commit to the remote repository
For adding the file
use, git add <file Name> or git add . ( all files)
For committing the
file, we need to use the command,
git commit –m “Message for commit”
git commit –m “Message for commit”
If we want to
commit only specific files we can use
Git commit file1
file2
Undo Git Commit
There are cases
where we need to revert back the commits done. Git provides us the ways using
git reset
<file> - which will remove it from the current index (the "about to
be committed" list) without changing anything else.
Or we can use “git
reset” without any file name to unstage all due changes. This can come in handy
when there are too many files to be listed one by one in a reasonable amount of
time.
Reset
Consider that we called git
add -all, now all files are added. I did not make
a commit and push. How can i undo my action?
Git provides us a
way for undoing the action by using “git reset HEAD”
Push to origin
Once the changes
are committed to the local repository, we need to make sure the changes are
pushed to the remote for other developers to access. This can be done using
[root@vx111a
SampleTest]# git push origin master
Username for
'https://github.com': jagadish12
Password for
'https://jagadish12@github.com':
Total 0 (delta 0),
reused 0 (delta 0)
To https://github.com/jagadish12/SampleTest.git
* [new branch] test -> test
This will push the local
repository changes to the remote repository. master is the local repository.
Git Logging
As other SVN tools,
Git supports logging. We can use commands for getting the basic details like,
[root@vx111a
SampleTest]# git log
commit
3b65aa9e103740a323ee157b93c6f5a4785e4f25
Author: jagadish12
<jagadesh.manchala@gmail.com>
Date: Fri Dec 4 13:44:51 2015 +0530
Hello World Index Changed
commit
c384865e37e6848a847859b94a1d7e50d61f2c31
Author: jagadish12
<jagadesh.manchala@gmail.com>
Date: Thu Dec 3 19:54:53 2015 +0530
second Check
commit
b96af507d8e407e6c99b8a1e6c6ef5f61152657c
Author: jagadish12
<jagadesh.manchala@gmail.com>
Date: Thu Dec 3 19:52:39 2015 +0530
Sample Test Checking
The “git log”
command gives us the basic details of the recent commits and who has done that.
The logging can be
minimized using ,
[root@vx111a SampleTest]# git log --oneline
3b65aa9 Hello World
Index Changed
c384865 second
Check
b96af50 Sample Test
Checking
Pretty logging is
also available as,
[root@vx111a
SampleTest]# git log --pretty
commit
3b65aa9e103740a323ee157b93c6f5a4785e4f25
Author: jagadish12
<jagadesh.manchala@gmail.com>
Date: Fri Dec 4 13:44:51 2015 +0530
Hello
World Index Changed
commit
c384865e37e6848a847859b94a1d7e50d61f2c31
Author: jagadish12
<jagadesh.manchala@gmail.com>
Date: Thu Dec 3 19:54:53 2015 +0530
second Check
commit
b96af507d8e407e6c99b8a1e6c6ef5f61152657c
Author: jagadish12
<jagadesh.manchala@gmail.com>
Date: Thu Dec 3 19:52:39 2015 +0530
Sample Test Checking
Some more logging
command include,
git log --graph
--oneline --decorate --all
git log --name-status
git log --name-status
Remove Remote
Branches
Git also provides
us ways to remove Branches in the Remote repository. This can be done using
git push origin
--delete <branchName>
Git History
Git provides us
various commands in working with the History. We can use the basic command like
[root@vx111a git-test]#
git log --author=jagadish12
commit c0a6f2e99ae634af6f8d13d6036fa751f9e558c7
Author: jagadish12 <jagadesh.manchala@gmail.com>
Date: Thu Dec 3 19:41:37 2015 +0530
checking
commit 1419b2dce7162f8ef8bda8f9cace0e60beb70c4a
Author: jagadish12 <jagadesh.manchala@gmail.com>
Date: Thu Dec 3 18:48:46 2015 +0530
hai Comitted
commit 00904bbce573da14764b28c9e0f527e4d00833d1
Author: jagadish12 <jagadesh.manchala@gmail.com>
Date: Thu Dec 3 17:48:52 2015 +0530
first Check
commit c0a6f2e99ae634af6f8d13d6036fa751f9e558c7
Author: jagadish12 <jagadesh.manchala@gmail.com>
Date: Thu Dec 3 19:41:37 2015 +0530
checking
commit 1419b2dce7162f8ef8bda8f9cace0e60beb70c4a
Author: jagadish12 <jagadesh.manchala@gmail.com>
Date: Thu Dec 3 18:48:46 2015 +0530
hai Comitted
commit 00904bbce573da14764b28c9e0f527e4d00833d1
Author: jagadish12 <jagadesh.manchala@gmail.com>
Date: Thu Dec 3 17:48:52 2015 +0530
first Check
You can also easily match
on multiple authors as regex is the underlying mechanism for this filter. So to
list commits by Jonathan or Adam, you can do this:
git log
--author="\(Adam\)\|\(Jon\)"
Differences
Git also provides
ways for identifying the differences between multiple branches using
git diff
<source_branch> <target_branch>
Tag
it's recommended to
create tags for software releases.This is a known concept, which also exists in
SVN. You can create a new tag named 1.0.0by executing
git tag 1.0.0 1b2e1d63ff
the 1b2e1d63ff stands for the first 10 characters of the commit id you want to reference with your tag.
git tag 1.0.0 1b2e1d63ff
the 1b2e1d63ff stands for the first 10 characters of the commit id you want to reference with your tag.
By this we had discussed
the advanced topics of Git. More to Come
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