The scripts provided create the CMS virtual machine image based on CernVM, with Scientific Linux CERN 6 (slc6).
First, you need to run a normal Micro-CernVM, using your own context so you can login. Copy the attached files to the running VM and then login.
Inside the VM, you first need a copy of the latest Micro-CernVM release as a template for the Open Data image. Download it, inside the running VM, from: https://cernvm.cern.ch/releases/ucernvm-images.2020.07-1.cernvm.x86_64/ucernvm-v4prod.2020.07-1.cernvm.x86_64.hdd placing it in the same directory as the other files.
Run the script:
./cernvm-script which will produce some output on the terminal, and then finish.
The result should be a file with the title coming from the -n field in the script. In this case, the file we're interested in is:
CMS-OpenData-1.5.3.ova which can be copied from the running VM to elsewhere.
The open data are released under the Creative Commons CC0 waiver. Neither CMS nor CERN endorse any works, scientific or otherwise, produced using these data. All releases will have a unique DOI that you are requested to cite in any applications or publications.