!CHAOS uses git as code version system and national open-source service "INFN Stash" for central approval server. 

In our development, the rule versions are expressed with the follow semantic: x.y.z-[alpha,beta,rc].yy.

• Major version "X" is upgraded when in the framework are added substantial functionalities;
• Minor version "Y" is upgraded when some functionalities are introduced and or substantial private code is changed;
• Patch version "Z" is upgraded when bugs and wrong behaviours are solved;

next section of the semantic, define the stability of the code and identify its maturity level.

• Maturity level is dived into three levels:
  • alpha: the code is working showing all its functionalities but it can develop a lot of bugs;
  • beta: represents the usable code with all its functionalities and can be used for testing the new ones;
  • rc: "release candidate", it identifies the code when is mature for release and the versioning with the minor tweaks ready to go on production.
• YY: represent the minor version of the upper described maturity level.

GIT suggested documentation

A comprehensive git documentation:

https://git-scm.com/book/en/v2

A nice command-line emulator (we suggest to keep it open alongside the documentation and use it to practice the commands)

https://try.github.io/levels/1/challenges/1

GIT useful commands

• git status:  shows information about the status of the branch (file modified, to add, untracked)
• git branch -av: shows information about all the branches (local and remote) of the git repository
• git checkout -b <branch name>:  create a new branch  with the specified name.
• git checkout -t -b <mybranch> <origin/branch name>:  create a new branch named <mybranch> from the remote <origin/branch name> and link them (tracking option)  with the specified name.
• git checkout <branch name>: move to an existing one
• git commit -m "comments" .: commit modifications to the local repository
• git pull .:  update the local repository with remote changes of your local branch.
• git push [origin branch name]: push local branch into specified remote branch.
• git merge <branch name >: merge modifications of branch name into the current one
• git clone <url of git remote repository>: will create a copy of the repository in your local directory

GIT typical case

I want to modify add something in a existing git repository. Ideal steps:

Let's suppose to be in the development or master branch.

0] be sure you are aligned with the remote

git fetch

git pull

1] create a new branch.

git checkout -b <my branch>