docker supplementary group not reloading causes VLAN configuration failure

[vjayaramrh]

When following the steps from https://github.com/nephio-project/docs/blob/main/content/en/docs/guides/user-guides/exercise-2-oai.md on a VM from start (including docker install) to finish, the below issue is encountered due to the docker supplementary group not getting reloaded.

[fedora@nephio-r2-e2e-vish-fedora-2 ~]$ ./test-infra/e2e/provision/hacks/vlan-interfaces.sh
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/core-md-0-kw6vg-wqtfk-4chmk/json": dial unix /var/run/docker.sock: connect: permission denied
[fedora@nephio-r2-e2e-vish-fedora-2 ~]$ id
uid=1000(fedora) gid=1000(fedora) groups=1000(fedora),4(adm),10(wheel),190(systemd-journal) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

The work around is to either logout and re-login into the VM or issue the newgrp docker command to reload the supplementary docker group

[fedora@nephio-r2-e2e-vish-fedora-2 ~]$ newgrp docker
[fedora@nephio-r2-e2e-vish-fedora-2 ~]$ id
uid=1000(fedora) gid=990(docker) groups=990(docker),4(adm),10(wheel),190(systemd-journal),1000(fedora) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

The docs need an update to call this out so that users are aware.

cc: @electrocucaracha @rravindran123 @liamfallon

[electrocucaracha]

We also need to standardize the docker client calls to use or not sudo

• https://github.com/nephio-project/test-infra/blob/main/e2e/tests/free5gc/007.sh#L55
• https://github.com/nephio-project/test-infra/blob/main/e2e/provision/hacks/vlan-interfaces.sh#L25-L26

I think that this is not detected by the CI because the runuser instruction loads the latest information group (https://github.com/nephio-project/test-infra/blob/main/e2e/provision/init.sh#L155)