#!/bin/sh
set -e

main() {
  # Use UTC time for everything.
  export TZ=UTC0
  # Set minimal locale.
  export LC_ALL=C
  # Set source date. This is honored by `asciidoctor` and other tools.
  SOURCE_DATE_EPOCH="$(git log -1 --pretty=%ct)"
  export SOURCE_DATE_EPOCH

  if ! command -v rad > /dev/null; then
    echo "fatal: rad is not installed" >&2 ; exit 1
  fi

  if ! command -v podman > /dev/null; then
    echo "fatal: podman is not installed" >&2 ; exit 1
  fi

  if ! command -v sha256sum > /dev/null; then
    echo "fatal: sha256sum is not installed" >&2 ; exit 1
  fi

  rev="$(git rev-parse HEAD)"
  gitarchive="build/heartwood-$rev.tar.gz"
  keypath="$(rad path)/keys/radicle.pub"
  version="$(build/version)"
  image=radicle-build-$version
  rust_version="$(build/rust-version)"

  if [ ! -f "$keypath" ]; then
    echo "fatal: no key found at $keypath" >&2 ; exit 1
  fi
  # Authenticate user for signing
  rad auth

  echo "Building Radicle $version.."
  echo "Creating archive of repository at $rev in $gitarchive.."
  git archive --format tar.gz -o "$gitarchive" HEAD

  echo "Building image ($image).."
  podman --cgroup-manager=cgroupfs build \
    --build-arg "RUST_VERSION=$rust_version" \
    --build-arg SOURCE_DATE_EPOCH \
    --build-arg TZ \
    --build-arg LC_ALL \
    --build-arg "RADICLE_VERSION=$version" \
    --build-arg "GIT_HEAD=$rev" \
    --arch amd64 --tag "$image" -f ./build/Dockerfile - < "$gitarchive"

  echo "Creating container (radicle-build-container).."
  podman --cgroup-manager=cgroupfs create --ulimit=host --replace --name radicle-build-container "$image"

  # Copy build artifacts to output folder.
  outdir=build/artifacts
  mkdir -p $outdir
  podman cp --overwrite radicle-build-container:/builds/. $outdir/

  while IFS= read -r target
  do
    echo "Signing artifacts for $target.."

    filename="radicle-$version-$target.tar.xz"
    filepath="$outdir/$filename"

    # Output SHA256 digest of archive.
    checksum="$(cd $outdir && sha256sum "$filename")"
    echo "Checksum of $filepath is $(echo "$checksum" | cut -d' ' -f1)"
    echo "$checksum" > "${filepath}.sha256"

    # Sign archive and verify archive.
    rm -f "${filepath}.sig" # Delete existing signature
    ssh-keygen -Y sign -n file -f "$keypath" "$filepath"
    ssh-keygen -Y check-novalidate -n file -s "$filepath.sig" < "$filepath"
  done < build/TARGETS

  # Remove build artifacts that aren't needed anymore.
  podman rm radicle-build-container > /dev/null
  podman rmi --ignore "localhost/$image"
}

# Run build.
echo "Running build.."
main "$@"

# Show artifact checksums.
echo
build/checksums
echo

echo "Build successful."