O2openaccess

Repository for ALICE open access software

ALICE software documentation

Root of repository have the enable, enable_local and build_cmd scripts used for
loading O2Physics environment and build the example analysis from src/ directory (see below)
cmake/ and src/ contain the example analysis task
- the compilation of this stand-alone analysis task is done by build_cmd command
analysis/ directory contain the files required to run an example analysis
- see the Analysis info
See Container info for information on the tools to build an cvmfs enabled EL9 container
cvmfs/ have cvmfs2go script to be able to use cvmfs within a container (for hosts where cvmfs is not available)
- taken from https://github.com/adriansev/cvmfs2go
- see the cvmfs/README.md for more information
upload/ Is dedicated to ALICE OpenData operators for uploading data to OpenData EOS storage
- see Uploading data to CERN OpenData

Any Linux (x86_64 architecture) with container capabilities
apptainer or singularity installed for usage of cvmfs2go + el9cvmfs container

enable/enable_local are to be sourced to load the O2Physics environment in current shell (N.B.!!!)

take as a 1st argument a tag name of O2Physics installation
- For usage of cvmfs distributed O2Physics: source enable <optional O2Physics tag>
- For usage of a local compiled O2Physics: source enable_local <optional O2Physics local build tag>

There are a few of steering env vars:

O2OPENACCESS_SW_TAG_LOCAL : tag name to be used for O2Physics dependency(local installed)
- It has a default of: latest-o2physics-o2
O2OPENACCESS_SW_TAG_CVMFS : tag name to be used for O2Physics dependency(cvmfs based)
- It has a default of: daily-20260126-0000-1

Another way to specify the software tag to be used is to provide it as an argument like:

Within the repository, use ./build_cmd for task compilation It has the following arguments:

debug : enable very verbose debug options for cmake
build_cmd take as argument [local] tag_name
- use local to specify that the tag_name is of a local O2Physics installation and as such enable_local script will be used

N.B. clang is a requirement for building O2Physics software !!!

See details in analysis directory
Use the provided ./run_analysis example to run analysis in an already loaded environment

To find help on options use: o2-analysistutorial-flow-analysis --help

or for more comprehensive help o2-analysistutorial-flow-analysis --help full

For running analysis in singularity containen make use of cvmfs2go script from cvmfs directory.

If required, on the subject of CCDB objects caching see CCDB caching information