|
Setting up CMSSW in GitLab CI with CernVM File System (CVMFS)
|
Special GitLab CVMFS runners are required to run CI jobs that need CVMFS, e.g. to run CMSSW.
If the setup script tries to access unset variables, then that can cause the CI to fail when using strict shell scripting checks.
|
|
Compiling a CMSSW package
|
For code to be compiled in CMSSW, it needs to reside within the work area’s src directory.
The analysis code from the Git repository is copied to the CMSSW work area in the CI script.
When using commands such as git cms-addpkg, the git configuration needs to be adjusted/set first.
|
|
Obtaining a grid proxy
|
Special care is needed when adding secrets in GitLab.
Passwords and certificates should always be set to Protected state.
Certificates need to be base64-encoded for use as secrets.
|
|
CAT services for GitLab CI
|
To use CAT services, your project needs to reside into cms-analysis.
You won’t need to expose any personal credentials.
It is easy to host your analysis code in cms-analysis.
|
|
Running a CMSSW job
|
A special CMSSW image is required to successfully run CMSSW jobs.
Running on CMS data requires a grid proxy, or the files to be stored in the CAT managed area.
Several ways are available to access CMS specific files.
CAT provides services that avoid the danger of leaking credentials.
The use of artifacts allows passing results of one step to the other.
Since artifacts are write-protected, the directory needs to be copied before running CMSSW.
|
|
Building a container image
|
|