#!/usr/bin/env bash
#
# Usage: stage-artifacts.sh <state-dir> <output-dir> [projects]
#
# Copies the deployed files of the given projects to the output directory under their deployed name,
# skipping those identical to the deployed file, and lists the projects with copied files in
# state-dir/deployed-projects. Reads state-dir/deploy-artifacts ("<project> <build output> <deployed name>"
# per line, written by affected-projects.sh) and state-dir/deployed-hashes (sha256sum output of the deployed files).

set -euo pipefail

state="$1"
output="$2"
projects=" ${3:-} "

mkdir -p "$output"
: > "${state}/deployed-projects"

while read -r project source name; do
  if [[ "$projects" != *" ${project} "* ]]; then
    continue
  fi

  hash="$(sha256sum "$source" | cut -d ' ' -f 1)"
  if grep -qxF "${hash}  ${name}" "${state}/deployed-hashes"; then
    echo "${name} from ${project} is unchanged"
  else
    echo "Staging ${name} from ${project}"
    cp "$source" "${output}/${name}"
    echo "$project" >> "${state}/deployed-projects"
  fi
done < "${state}/deploy-artifacts"