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# One job, and it only ever runs on a schedule.
#
# jolt-native publishes its Android objects under a "latest" alias on every
# default-branch build, and frq takes them as a flake input. A flake input is
# locked once and then stays put, so "latest" only means latest when something
# re-resolves it. The `apk` recipe does that for the machine building an APK;
# this does it for the repository, so main's flake.lock names a recent build
# rather than whichever one it was first locked against.
#
# Nothing is built here. The job resolves one input, and if that moved, commits
# the lock file. Whether the new objects actually work is what an APK build
# answers, and that is deliberately not this job's business.
stages: [update]

update-jolt-native:
  stage: update
  image: nixos/nix:latest
  # Schedules only: on a push this would race whoever pushed, and on a merge
  # request it would commit to a branch nobody asked it to touch.
  rules:
    - if: $CI_PIPELINE_SOURCE == "schedule"
  variables:
    # Committing reads the previous lock, so the checkout needs the git tree
    # rather than a shallow single commit.
    GIT_DEPTH: "0"
  before_script:
    - echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf
  script:
    - |
      set -eu
      nix flake update jolt-native-android
      if git diff --quiet -- flake.lock; then
        echo "already on the newest build; nothing to commit."
        exit 0
      fi
      # The alias moves whenever jolt-native builds, so name *which* build this
      # landed on rather than saying "update flake.lock". lastModified is the
      # only readable identity a tarball input carries — the jolt-native commit
      # that produced it is not in the archive's metadata.
      epoch=$(nix eval --raw --impure --expr \
        "builtins.toString (builtins.fromJSON (builtins.readFile ./flake.lock)
           ).nodes.jolt-native-android.locked.lastModified")
      stamp=$(date -u -d "@$epoch" +%Y-%m-%dT%H:%MZ)
      git config user.email "$GITLAB_USER_EMAIL"
      git config user.name "nightly"
      git add flake.lock
      # [skip ci] because this pushes to the default branch, and the only job
      # in this file is the one already running.
      git commit -m "Follow jolt-native to its $stamp build [skip ci]"
      # CI_JOB_TOKEN cannot push. FRQ_PUSH_TOKEN is a project access token with
      # write_repository, which is the one thing this job needs configured.
      git push "https://oauth2:$FRQ_PUSH_TOKEN@$CI_SERVER_HOST/$CI_PROJECT_PATH.git" \
        "HEAD:$CI_DEFAULT_BRANCH"