Deploy a new kernel into a GKE VM

deploy_kernel_to_gke.sh

#!/bin/bash

set -eo pipefail

FETCH_DEBS=fetch_ubuntu_mainline_debs.sh
FETCH_DEBS_PATH=$PWD/$FETCH_DEBS

if [[ $# -lt 2 ]]; then
    >&2 echo "usage: $0 <KERNEL-VERSION> <NODE-NAME> [NODE-NAME ...]"
    >&2
    >&2 echo "Select instances from the list below:"
    >&2 gcloud compute instances list
    exit 1
fi

ERSION=$(echo "$1" | sed 's/^v//')
shift

if ! echo $ERSION | grep -q "[0-9].[0-9]\+"; then
    >&2 echo "Unrecognized kernel version '$ERSION'. Should be X.Y."
    exit 1
fi

echo "Deploying kernel $VERSION..."
for node in "$@"; do
    gcloud compute scp $FETCH_DEBS_PATH $node:/tmp;
    gcloud compute ssh $node -- \
         'cd /tmp && ./'$FETCH_DEBS' '$ERSION' \
         && sudo dpkg -i *.deb \
         && sudo systemctl reboot -i' \
    || >&2 echo "WARNING: ssh exit-code $?"
done