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FairShip

Introduction

FairShip is the software framework for the SHiP experiment which is based on FairRoot. The dependencies of FairShip are tracked and installed using alibuild.

Branches

master
Main development branch. All python code is required to be compatible with python 2 and 3 until compatibility with python 2 can be dropped. Requires aliBuild default fairship.
SHiP-2018
Frozen branch for the CDS, kept for backward compatibility. Python 2 only. Requires aliBuild default fairship-2018.
muflux
Branch for the muon flux analysis. Python 2 only. Requires aliBuild default fairship-2018.

All packages are managed in Git and GitHub. Please read the Git tutorial for SHiP first, even if you already know Git, as it explains how development is done on GitHub.

Build Instructions using CVMFS

  1. Download the FairShip software

    git clone https://github.com/ShipSoft/FairShip.git
  2. Make sure you can access the SHiP CVMFS Repository

    ls /cvmfs/ship.cern.ch
  3. Source the setUp script

    source /cvmfs/ship.cern.ch/SHiP-2018/latest/setUp.sh
  4. Build the software using aliBuild

    aliBuild build FairShip --default fairship --always-prefer-system --config-dir $SHIPDIST

    If you are not building master, you will need to select the appropriate default (see Branches).

If you exit your shell session and you want to go back working on it, make sure to re-execute the third step.

To load the FairShip environment, after you build the software you can simply use:

  1. Load the environment
    alienv enter FairShip/latest

However, this won't work if you are using HTCondor. In such case you can do:

eval alienv load FairShip/latest

Local build, without access to CVMFS

Commands are similar to the previous case, but without access to CVMFS you need to build the required packages.

  1. Download the FairShip software
    git clone https://github.com/ShipSoft/FairShip.git
  2. Build the software using aliBuild
    FairShip/aliBuild.sh
  3. Load the environment
    alibuild/alienv enter FairShip/latest

Run Instructions

Set up the bulk of the environment from CVMFS.

source /cvmfs/ship.cern.ch/SHiP-2018/latest/setUp.sh

Load your local FairShip environment.

alibuild/alienv enter (--shellrc) FairShip/latest

Now you can for example simulate some events, run reconstruction and analysis:

python $FAIRSHIP/macro/run_simScript.py
>> Macro finished succesfully.
>> Output file is  ship.conical.Pythia8-TGeant4.root

python $FAIRSHIP/macro/ShipReco.py -f ship.conical.Pythia8-TGeant4.root -g geofile_full.conical.Pythia8-TGeant4.root
>> finishing pyExit

python -i $FAIRSHIP/macro/ShipAna.py -f ship.conical.Pythia8-TGeant4_rec.root -g geofile_full.conical.Pythia8-TGeant4.root
>> finished making plots

Run the event display:

python -i $FAIRSHIP/macro/eventDisplay.py -f ship.conical.Pythia8-TGeant4_rec.root -g geofile_full.conical.Pythia8-TGeant4.root
// use SHiP Event Display GUI
Use quit() or Ctrl-D (i.e. EOF) to exit

Docker Instructions

Docker is not the recommended way to run FairShip locally. It is ideal for reproducing reproducible, stateless environments for debugging, HTCondor and cluster use, or when a strict separation between FairShip and the host is desirable.

  1. Build an docker image from the provided Dockerfile:
    git clone https://github.com/ShipSoft/FairShip.git
    cd FairShip
    docker build -t fairship .
  2. Run the FairShip docker image:
    docker run -i -t --rm fairship /bin/bash
  3. Advanced docker run options:
    docker run -i -t --rm \
    -e DISPLAY=unix$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix \
    -v /local_workdir:/image_workdir \
    fairship /bin/bash
    The option -e DISPLAY=unix$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix forwards graphics from the docker to your local system (similar to ssh -X). The option -v /local_workdir:/image_workdir mounts /local_workdir on the local system as /image_workdir within docker.

Contributing Code

Build Targets Related to C++ Code Style-Guide

The following targets are only available if clang-format, clang-tidy and git are installed.

Build targets indicated with * always come in three different flavors.

  • no-suffix: executes the target on source files that changed compared to origin/master -- e.g. make check-format
  • -staged: executes the target on source files that have been staged -- e.g. make check-format-staged
  • -all: executes the target on all source files in the project -- e.g. make check-format-all
Target Description
check-format* run clang-format on selected files. Fails if any file needs to be reformatted
show-format* run clang-format on selected files and display differences
format* run clang-format on selected files and update them in-place
check-tidy* run clang-tidy on selected files. Fails if errors are found
show-tidy* run clang-tidy on selected files and display errors.
tidy* run clang-tidy on selected files and attempt to fix any warning automatically
check-cpplint* run cpplint on selected files. Fails if errors are found and displays them.
check-submission will build, run all tests, check formatting, code style, and generate documentation and coverage report
fix-submission will attempt to fix the reported issues using clang-format and clang-tidy. Failing build, tests, compiler warnings, issues from cpplint and warnings from doxygen must be fixed manually. Also some clang-tidy issues cannot be resolved automatically

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SHiP experiment framework based on FairRoot

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