Notes

#!/bin/zsh

# Output file
gke_output_file="gkeout.txt"

# Initialize the output file with a header
# This creates the file and adds a header row to indicate the data columns
echo "GCP Project ID | Cluster Name | Kubernetes Version" > "$gke_output_file"
echo "---------------------------------------------" >> "$gke_output_file"

# Get a list of all GCP projects
# This uses the gcloud command to list all projects accessible to the user
# The format 'value(projectId)' ensures only project IDs are retrieved
projects=$(gcloud projects list --format="value(projectId)")

# Check if there are any projects
if [[ -z "$projects" ]]; then
echo "No GCP projects found. Exiting."
exit 0
fi

# Traverse through each project
# Loop through each project ID retrieved earlier
for project_id in ${(f)projects}; do
# Set the project in gcloud
# This sets the active project for subsequent gcloud commands
if ! gcloud config set project "$project_id" > /dev/null 2>&1; then
echo "Failed to set project $project_id. Skipping." >> "$gke_output_file"
continue
fi

# Get the list of GKE clusters and their Kubernetes versions
# This retrieves the GKE clusters in the current project along with their Kubernetes version
clusters=$(gcloud container clusters list --format="value(name,currentMasterVersion)")

# Check if there are any clusters
# If no clusters are found, skip to the next project
if [[ -z "$clusters" ]]; then
echo "No GKE clusters found in project $project_id. Skipping." >> "$gke_output_file"
continue
fi

# Append cluster details to the output file
# Loop through each cluster retrieved for the current project
while read -r cluster; do
cluster_name=$(echo "$cluster" | awk -F't' '{print $1}')
cluster_version=$(echo "$cluster" | awk -F't' '{print $2}')
echo "$project_id | $cluster_name | $cluster_version" >> "$gke_output_file"
done <<< "$clusters"
done

# Inform the user about the output
# Notify the user that the operation is complete and the data is saved
echo "Cluster details have been saved to $gke_output_file."