#!/bin/bash

# Abort if anything goes wrong.
set -euo pipefail

# Decide what Rust toolchain to use.
case "$DOCKER_TAG" in
  # Always map the Docker tags `latest` and `experimental` to stable Rust.
  latest|experimental)
    TOOLCHAIN=stable
    ;;
  # Strip `experimental-` from other `experimental-*` tags.
  experimental-*)
    TOOLCHAIN="${DOCKER_TAG/experimental-/}"
    ;;
  # Pass all our tags
  *)
    TOOLCHAIN="$DOCKER_TAG"
    ;;
esac

# Run the build.
docker build --build-arg TOOLCHAIN="$TOOLCHAIN" -t "$IMAGE_NAME" .