Logins into all clusters, for all projects in `gcloud`

gcloud-k8s-init.sh

#!/usr/bin/env sh
#
# Will add k8s (cluster) credentials for all existing projects for current
# gcloud account.
#
# Author: augusto.hp+oss@gmail.com

# shellcheck disable=SC3043
set -e

OPTION_SEPARATOR=","

for dep in gcloud kubectl awk sed
do
	if [ -z "$(command -v $dep)" ]
	then
		echo "Error: $dep missing." >&2
		exit 2
	fi
done

list_projects()
{
	gcloud projects list \
		| grep -v sys \
		| grep -v "PROJECT" \
		| awk '{ print $1 }'
}

list_k8s_clusters()
{
	gcloud container clusters list \
		| grep -v "^NAME" \
		| awk -v OFS="$OPTION_SEPARATOR" '{ print $1, $2 }'
}

switch_project()
{
	local project="$1"

	gcloud config set project "$project" > /dev/null 2>&1
}

indent()
{
	sed 's/^/  /'
}

main()
{
	local current_project=""
	local cluster=""
	local location=""

	current_project="$(gcloud config get project)"
	for project in $(list_projects)
	do
		echo "Project: $project"
		switch_project "$project"
		for cluster_location in $(list_k8s_clusters)
		do
			cluster="$(echo "$cluster_location" | cut -f1 -d$OPTION_SEPARATOR )"
			location="$(echo "$cluster_location" | cut -f2 -d$OPTION_SEPARATOR )"
			echo "Cluster: $cluster" | indent
			gcloud container clusters get-credentials "$cluster" --location="$location" 2>&1 | indent | indent
		done
	done
	switch_project "$current_project"
}

main