#!/usr/bin/env nix-shell
#!nix-shell -i sh -p nixUnstable git curl

set -eux -o pipefail

TARGET_BRANCH="nixpkgs-upgrade-$(date +%Y-%m-%d)"

echo '{}' > morph/grid/local/public-keys/users.nix
# nix-build -A morph -o result-before

git checkout "${TARGET_BRANCH}" || git checkout -b "${TARGET_BRANCH}"

# Spawn *another* nix-shell that has the *other* update-nixpkgs tool.  Should
# sort out this mess sooner rather than later...
nix-shell ./shell.nix --run update-nixpkgs

# nix-build -A morph -o result-after
diff=$(nix --extra-experimental-features nix-command store diff-closures ./result-before/ ./result-after/)

git commit -am "bump nixpkgs version"
git push origin "${TARGET_BRANCH}:${TARGET_BRANCH}"

BODY="{
    \"id\": ${CI_PROJECT_ID},
    \"source_branch\": \"${CI_COMMIT_REF_NAME}\",
    \"target_branch\": \"${TARGET_BRANCH}\",
    \"remove_source_branch\": true,
    \"title\": \"WIP: ${CI_COMMIT_REF_NAME}\",
    \"assignee_id\":\"jcalderone"
}";

curl -X POST --data "${BODY}" --header "Content-Type: application/json" --header "PRIVATE-TOKEN: ${UPDATE_NIXPKGS_PRIVATE_TOKEN}" "${HOST}/api/v4/projects/merge_requests"