#!/usr/bin/env bash

set -euo pipefail

say() {
  echo "$1" >&2
}

git_sha="$(git rev-parse HEAD)"
git_sha="${git_sha:0:8}"

git_branch="$(git branch --show-current)"

git_tag="${git_branch}-${git_sha}"

say "Building nix/ops/image..."
nix_out="$(nix-build nix/ops -A image --no-out-link "$@")"

say "Loading $nix_out into Docker..."
nix_name="$(docker load --quiet --input $nix_out)"
nix_name="${nix_name#Loaded image: }"

say "Re-tagging with git metadata..."
image_repo="$(docker images $nix_name --format '{{.Repository}}')"
image_name="${image_repo}:${git_tag}"
docker tag $nix_name $image_name

# Output only the new tag on stdout for subsequent pipes/tooling.
say $nix_name
echo $image_name