[k8s] Fix GPU detection when running with sky local up --ips
#4561
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When
sky local up --ips
is run on a remote cluster with CPUs only, our script incorrectly detects GPUs and gets stuck at installing nvidia GPU operator. This is because the check_gpu function is silently failing but the output is still being interpreted as truthy. This PR fixes it by explicitly returning true/false values.Tested (run the relevant ones):
bash format.sh
sky local up --ips ips.txt --ssh-user ubuntu --ssh-key-path ~/.sky/generated/ssh-keys/aws.key
on a CPU only cluster.