How to contribute / Git repository on Savannah

GetFEM++ is an open source finite element library based on a collaborative development. If you intend to make some contributions, you can ask for membership of the project there. Contributions of all kinds are welcome: documentation, bug reports, constructive comments, changes suggestions, bug fix, new models, etc ...

Contributors are of course required to be careful that their changes do not affect the proper functioning of the library and that these changes follow a principle of backward compatibility.

See here for a list of task and discussions about GetFEM++ development.

IMPORTANT : a contributor implicitly accepts that his/her contribution will be distributed under the LGPL licence of GetFEM++.

The main repository of GetFEM++ is on Savannah, the software forge of the Free Software Foundation (see Savannah). The page of the project on Savannah is Getfem on Savannah. See also Getfem sources on Savannah.

How to get the sources

If you just want the sources and do not intend to make some contributions, you can just use the command

git clone

If you intend to make some contributions, the first step is to ask for the inclusion in the GetFEM++ project (for this you have to create a Savannah account). You have also to register a ssh key (see git on Savannah) and then use the command

git clone ssh://

How to contribute

Before modifying any file, you have to create a development branch because it is not allowed to make a modification directly in the master branch. It is recommended that the branch name is of the type devel-name-subject where name is your name or login and subject the main subject of the changes. For instance, if you chose devel-me-rewrite-fem-kernel as the branch name, the creation of the branch reads

git branch devel-me-rewrite-fem-kernel
git checkout devel-me-rewrite-fem-kernel

The first command create the branch and the second one position you on your branch. After that you are nearly ready to makes some modifications. You can specify your contact name and e-mail with the following commands in order to label your changes

git config --global "Your Name Comes Here"
git config --global

Locally commit your changes

Once you made some modifications of a file or you added a new file, say src/, the local commit is done with the commands:

git add src/
git commit -m "Your extensive commit message here"

At this stage the commit is done on your local repository but not in the Savannah one.

Push you changes in the Savannah repository

You can now transfer your modifications to the Savannah repository with

git push origin devel-me-rewrite-fem-kernel

where of course devel-me-rewrite-fem-kernel is still the name of your branch. At this stage your modifications are registered in the branch devel-me-rewrite-fem-kernel of Savannah repository. Your role stops here, since you are not allowed to modify the master branch of GetFEM++.

Ask for an admin to merge your modifications to the master branch of GetFEM++

Once you validated your modifications with sufficient tests, you can ask an admin of GetFEM++ to merge your modifications. For this, contact one of them directly, or send an e-mail to with the message : “please merge branch devel-me-rewrite-fem-kernel” with eventually a short description of the modifications. IMPORTANT : by default, your branch will be deleted after the merge, unless you express the need to keep it.

Merge modifications done by other contributors

You can run a

git pull origin master
git merge master

in order to integrate the modifications which has been validated and integrated to the master branch. This is recommended to run this command before any request for integration of a modification in the master branch.

Some useful git commands

git status  : status of your repository / branch

git log --follow "filepath"   : Show all the commits modifying the specified file (and follow the eventual change of name of the file).

gitk --follow filename : same as previous but with a graphical interface