switch-release-yml-to-v1.sh

#!/usr/bin/env bash

update_repo() {
  GU_REPO=$1
  API_PATH="/repos/guardian/$GU_REPO/contents/.github/workflows/release.yml"

  release_yml_api_data=$( gh api "$API_PATH" )
  release_yml_old_sha=$( echo "$release_yml_api_data" | jq -r .sha )
  release_yml_old_content=$( echo "$release_yml_api_data" | jq -r .content | base64 --decode )
  release_yml_new_content=${release_yml_old_content//reusable-release.yml@main/reusable-release.yml@v1}

  if [ "$release_yml_old_content" = "$release_yml_new_content" ]; then
    echo "No change: $GU_REPO"
  else
    message="Explicitly use version v1 of gha-scala-library-release-workflow"

    release_yml_new_content_base64=$(echo "$release_yml_new_content" | base64)
    echo "Updating $GU_REPO ..."
    if gh api --silent --method PUT "$API_PATH" --field message="$message" --field sha="$release_yml_old_sha" \
               --field content="$release_yml_new_content_base64"; then
      echo "...updated $GU_REPO"
    else
      echo "Failed to update $GU_REPO directly, will have to use PR..."
      default_branch=$( gh api /repos/guardian/etag-caching --jq .default_branch )
      PR_BRANCH="switch-release-yml-to-v1"
      head_commit=$( gh api "/repos/guardian/$GU_REPO/commits/$default_branch" --jq .sha )
      gh api --silent --method POST "/repos/guardian/$GU_REPO/git/refs" --field ref="refs/heads/$PR_BRANCH" --field sha="$head_commit"
      sleep 2
      gh api --method PUT "$API_PATH" --field message="$message" --field sha="$release_yml_old_sha" \
        --field content="$release_yml_new_content_base64" --field branch="$PR_BRANCH"
      sleep 2
      gh api --silent --method POST "/repos/guardian/$GU_REPO/pulls" -f "head=$PR_BRANCH" -f "base=$default_branch" -f "title=$message" -f "body=See https://github.com/guardian/gha-scala-library-release-workflow/pull/61"
    fi
  fi
}

while read -r GU_REPO; do
  update_repo "$GU_REPO"
done < "$1"