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First Steps in LHCb
Install party
10

Learning Objectives {.objectives}

  • Install git from source
  • Install Anaconda

In order to follow the Basics part of the workshop (first two days) you will need to have recent versions of Python and Git installed either on your laptop or on lxplus. The instructions below explain how you can install Python and libraries for scientific computing on lxplus by using the the Anaconda Python distribution. After that, they explain how you can compile a recent version of git, because the default version on lxplus is very old and doesn't support all the features we'll need.

Health warning {.callout}

Once you install things yourself you have an environment that is different from the "standard" LHCb setup. It means you have to keep software up-to-date yourself and when things start going wrong everyone will blame it on your custom setup. Keep that in mind. With great tools comes great responsibility.

Anaconda is a complete set of python interpreter and useful libraries. For example it comes with ipython pre-installed as well as matplotlib and scikit-learn.

To install Anaconda on lxplus or your Mac/Linux laptop follow these instructions:

  1. Visit the Anaconda downloads page.
  2. Make sure to select the correct operating system (Windows, Mac or Linux)
  3. For lxplus download the Linux 64bit - Python2.7 installer.
  4. Then on lxplus type bash Anaconda-2.2.0-Linux-x86_64.sh in the directory to which you downloaded the installer. Use bash no matter what your shell actually is.
  5. Follow the on-screen instructions and go with the default answer to all questions.

This will install a modern set of python libraries to ~/anaconda. This means you need to have some free space on your AFS home directory. Once it is done check that the installer added these two lines to your .bashrc:

# added by Anaconda 2.2.0 installer
export PATH="~/anaconda/bin:$PATH"

Log out of lxplus and back in. Now you should be able to start python as well as ipython, etc.

Removing Anaconda {.callout}

To remove Anaconda temporarily, simply comment out the two lines that were added to your .bashrc file. To permanently remove it simply delete the anaconda directory in your home directory.

To install git "from source" on lxplus follow these instructions.

  1. Visit the git repository on github
  2. Click on "releases", which takes you to the list of all git releases
  3. Download the .tar.gz for the latest release (v2.10.2) to lxplus:
$ wget https://github.com/git/git/archive/v2.10.2.tar.gz
  1. unpack the .tar.gz with tar xzf v2.10.2.tar.gz
  2. Change to the newly created git-2.10.2 directory: cd git-2.20.2
  3. Follow the INSTALL instructions.
  4. To install git in your home directory type:
$ export CURLDIR=$HOME/anaconda
$ mkdir $HOME/git-install-2.10.2
$ make prefix=$HOME/git-install-2.10.2
$ make prefix=$HOME/git-install-2.10.2 install
  1. Add the following line to your .bashrc:
export PATH="$HOME/git-install-2.10.2/bin:$PATH"

Removing git {.callout}

To temporarily remove git remove the line you added to your .bashrc, and delete the git-install-2.10.2 directory in your home directory to remove it permanently.