#!/usr/bin/env bash
# Build the watcher's NixOS QCOW2 image and upload it to Infomaniak Glance.
#
# Prereqs:
#   - Run inside `nix develop` (provides openstackclient + nix + flakes).
#   - terraform/infomaniak/.env populated and auto-sourced by the devShell.
#   - SSH pubkey pasted into hosts/watcher/default.nix.
#
# Re-run any time the watcher's NixOS config changes if you want fresh boots
# from a current image. Routine config updates after boot use nixos-rebuild
# instead (no image rebuild required).

set -euo pipefail

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$REPO_ROOT"

IMAGE_NAME="${TF_VAR_watcher_image_name:-nixos-watcher}"

: "${OS_AUTH_URL:?terraform/infomaniak/.env not loaded — run inside 'nix develop'}"

echo "==> building QCOW2 (this takes a few minutes the first time)"
nix build .#watcher-image

# nixos-generators names the file with the channel revision, e.g.
#   nixos-image-openstack-25.05.20260102.ac62194-x86_64-linux.qcow2
QCOW=$(ls "$(readlink -f result)"/*.qcow2 | head -1)
[ -f "$QCOW" ] || { echo "no qcow2 found under result/" >&2; exit 1; }
ls -lh "$QCOW"

echo "==> uploading to Infomaniak Glance as '$IMAGE_NAME'"
# If an older copy exists, delete it first (Glance image names aren't unique).
if openstack image show "$IMAGE_NAME" -f value -c id >/dev/null 2>&1; then
  echo "    older image found — deleting"
  openstack image delete "$IMAGE_NAME"
fi

openstack image create \
  --disk-format qcow2 \
  --container-format bare \
  --file "$QCOW" \
  --progress \
  "$IMAGE_NAME"

echo "==> done. Image:"
openstack image show "$IMAGE_NAME" -f table -c id -c name -c status -c size