singularity/apptainer sandbox images are not handled #2165
Description
I want to use Singularity/Apptainer sandbox images that are already present locally.
While using --singularity and --disable-pull options it doesn't find the image because it looks for .sif extension which doesn't exists in my case because the image is a sandbox (e.g. unpacked).
Here is an example:
cwlVersion: v1.2 class: CommandLineTool inputs: local_script: type: File inputBinding: position: 1 outputs: local_output: type: File outputBinding: glob: "output.txt" baseCommand: ["python"] hints: DockerRequirement: dockerPull: /path/to/containers/python/3.12-slim cwltool --debug --disable-pull --singularity hello_world_docker.cwl inputs.yaml [...] DEBUG Singularity error Traceback (most recent call last): File "cwltool/job.py", line 759, in run File "cwltool/singularity.py", line 361, in get_from_requirements cwl_utils.errors.WorkflowException: Container image _path_to_containers_python_3.12-slim_latest.sif not found ERROR Workflow error: Singularity is not available for this tool, try --no-container to disable Singularity, or install a user space Docker replacement like uDocker with --user-space-docker-cmd.: Container image _cvmfs_sw.cta-observatory.org_software_containers_python_3.12-slim_latest.sif not found [...]