Make rucio-client image compatible with rucio/rucio-clients:release-33+ base images

[AndresTanasijczuk]

This change allows to upgrade to a more recent rucio/rucio-clients base image (>= release-33.0.0), which use the new tool /usr/local/rucio_client/merge_rucio_configs.py to create the rucio config. See rucio/containers@89539d6.

Note that rucio configuration variables passed via environment variables now need to have the configuration section name after the RUCIO_CFG_ prefix. Thus, if the base image is updated to a version >= release-33.0.0, the VRE documentation (e.g. https://vre-hub.github.io/docs/rucio.html) must also be updated. For example, the command

docker run --user root -e RUCIO_CFG_CLIENT_X509_PROXY=/tmp/x509up -e RUCIO_CFG_AUTH_TYPE=x509_proxy -e RUCIO_CFG_ACCOUNT=<myrucioname> -v ....  -it --name=rucio-client ghcr.io/vre-hub/vre-rucio-client

should become

docker run --user root -e RUCIO_CFG_CLIENT_CLIENT_X509_PROXY=/tmp/x509up -e RUCIO_CFG_CLIENT_AUTH_TYPE=x509_proxy -e RUCIO_CFG_CLIENT_ACCOUNT=<myrucioname> -v .... -it --name=rucio-client ghcr.io/vre-hub/vre-rucio-client

[garciagenrique]

Hi @AndresTanasijczuk,

Thanks for this PR !

I will however put it on hold: until we don't move to v32+ on our cluster we won't be building images that are compatible with higher versions.
Also, I think that it will be a better approach to add the rucio.default.cfg.escape file to the rucio/containers repository (upstream) rather than here.

[AndresTanasijczuk]

Also, I think that it will be a better approach to add the rucio.default.cfg.escape file to the rucio/containers repository (upstream) rather than here.

They have their rucio.default.cfg in rucio/containers/clients/rucio.default.cfg (https://github.com/rucio/containers/blob/master/clients/rucio.default.cfg). The Dockerfile has to copy the rucio default config to the /opt/user/rucio.default.cfg location, because this is the location used by the merge_rucio_configs.py tool in the rucio/rucio-clients image (see https://github.com/rucio/containers/blob/master/clients/init_rucio.sh), so I think it is up to the VRE Dockerfile to overwrite /opt/user/rucio.default.cfg with the ESCAPE rucio default config.

[garciagenrique]

Thanks for the contribution @AndresTanasijczuk. I will add the PR and later make some small changes after testing, if needed