nixpkgs/nixos/maintainers/scripts/gce/create-gce.sh

#!/usr/bin/env nix-shell
#! nix-shell -i bash -p google-cloud-sdk

set -euo pipefail

BUCKET_NAME="${BUCKET_NAME:-nixos-images}"
TIMESTAMP="$(date +%Y%m%d%H%M)"
export TIMESTAMP

nix-build '<nixpkgs/nixos>' \
   -A config.system.build.googleComputeImage \
   --arg configuration "{ imports = [ <nixpkgs/nixos/modules/virtualisation/google-compute-image.nix> ]; }" \
   --argstr system x86_64-linux \
   -o gce \
   -j 10

img_path=$(echo gce/*.tar.gz)
img_name=$(basename "$img_path")
img_id=$(echo "$img_name" | sed 's|.raw.tar.gz$||;s|\.|-|g;s|_|-|g')
if ! gsutil ls "gs://${BUCKET_NAME}/$img_name"; then
  gsutil cp "$img_path" "gs://${BUCKET_NAME}/$img_name"
fi
gcloud compute images create "$img_id" --source-uri "gs://${BUCKET_NAME}/$img_name"