Obtain a copy of the model (using git)

Create a github user: You can create the github user yourself. Go to https://github.com/join and create a user (Make user-name which is easy to understand, for example FirstnameLastname. You can attach several email-addresses to the same user.)

Visit this page: https://git-scm.com/book/en/v2/Getting-Started-First-Time-Git-Setup

Send email to alf.grini@met.no (with a copy to oyvind.seland@met.no) to get the right permissions for the new github user (The email must contain who you are and the github username).

When you have the right permissions, you can obtain the code.

git clone https://githubUserName@github.com/metno/noresm.git

The last point will create a new directory called “noresm” in the place you checked out the model. Go to that directory before executing any git-commands.

If you get error messages, verify that you can open the page https://github.com/metno/noresm in a web-browser. If you can not, you are probably not a github-user or not member of the noresm group on github.

Also do the following on all machines where you use git:

Make sure you have a version of git >= 2.0 (add the line “module load git” to your .bashrc files on hexagon, vilje)

git config - -global push.default simple (Will edit your ~/.gitconfig file to a safer way to share your modifications, see http://stackoverflow.com/questions/13148066/warning-push-default-is-unset-its-implicit-value-is-changing-in-git-2-0)

Note that with git, the main branch is no longer called “trunk”, it is called “master”!

Verify that you have the correct checkout

When you have cloned the model, check that you have gotten what you wanted!

Check that your favourite branch is available using the command

git branch --all

(You should see the branch “master” on top with a star next to it. This is the branch you get by default. The other branches are listed below with remotes/origin/branchName, but you can not work on them until you check them out, see below)

To check out (locally) your favourite branch and to start working on it, write

git checkout -b myBranchName origin/myBranchName

(Note that myBranchName must be one of the branches listed by the above command)

If you don't user the “-b” option, you will get something which is not correct. Make sure you are tracking a remote branch. You can write

git branch -vv

to see which remote branch you are tracking. The output will be something like:

* myCheckedOutBranchName 1a08184 [origin/myCheckedOutBranchname] LatestCommitMessageOnBranch

Note that once a branch has been checked out using the -b option, you can switch between any of your checked out branches using the command

git checkout aCheckedOutBranchName

Note that in git, switching to a new branch change the files in your working directory. Git will warn you if you have any modified files before switching to a new branch. This is different from how svn works.

Modify files

Modify the code (for example a file named myChangedFile.F90) and send back to your local repository through

git add myChangedFile.F90

git commit -m "aMessage"

The message should link to the issue on github, so if you fix issue number 100 by this code change, you would probably write something like

git commit -am "Did part of the work to resolve metno/noresm#100"

Verify, using the tool “gitk” that the changes make sense.

Get modifications from github

git pull

To be absolutely sure about branch names etc, you can do

git pull remoteName remoteBranchName:myLocalBranchName

which if your are picking up changes the master-branch would translate to

git pull origin master:master

Send modifications to github

This command assumes that your changes go to the remote branch named like your branch (which is most of the times the case)

git push

You can also do (to be completely sure):

git push remoteName myLocalBranchName:remoteBranchName

which if your are changing the master-branch would translate to

git push origin master:master

(The above command means push my changes to the remote named “origin” from my local branch named master to the remote branch named master. If you are changing another branch than master, you must obviously not write “master”.)

If you don't understand and want to get back to svn

http://www.git-tower.com/blog/git-for-subversion-users-cheat-sheet/